Truck not performing as expected. Need help! Update
#2519717
07/09/18 09:54 PM
07/09/18 09:54 PM
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6pakdakota
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I just got my truck running after a head swap and header change and made it out to Milan on Sat. Listed below is the combo with before and after times. Old combo 88 D100 10.5:1. 493 850 demon carb Indy dual plane 346 heads with 2.14 in. 1.81 ex., mild bowl work and gasket match 1-3/4 headers Comp xe294 hydraulic cam Comp 1.5 roller rockers Performer rpm fuel pump -8an lines from cell to pump 3/8 lines from pump to carb Manual valve body 727 Converter flashes to about 3000 rpm 4.10 8-3/4 295/65r15 drag radials Best time 12.10 and 110mph @ about 3800lbs. 1.68 60ft New combo is the same but with sidewinder heads with bowl work and gasket match by Marsh Performance, 2” primary headers, 3-1/2” collectors. Best time 11.98 and 110mph @ about 3650-3700lbs. I will be putting the truck on scales tomorrow. 1.65 60ft I thought the weight decrease alone would have put me into the 11’s and I thought I should have gained at least a little mph. The only thing I can think of is maybe the fuel filter doesn’t flow enough to keep up. I also have a porter .600 lift 266 @ .50 solid flat tappet can to install also but I was trying to wait to finish my Dana 60 and get a new converter. What do you guys think? Was I crazy to expect 11.60’s out of this combo?
Last edited by 6pakdakota; 10/01/18 03:01 AM.
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Re: Truck not performing as expected. Need help!
[Re: dvw]
#2519804
07/10/18 12:17 AM
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6pakdakota
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What was the weather previously? Its been pretty brutal here this week. 300 flash stall is pretty tight. Doug The previous temp was probably about 70. It was about 80 degrees last Saturday.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2519811
07/10/18 12:24 AM
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It seems to me that I am losing about 100hp somewhere.
Last edited by 6pakdakota; 07/10/18 03:43 AM.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2519891
07/10/18 10:19 AM
07/10/18 10:19 AM
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an8sec70cuda
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Pretty much agree w/ everyone else...the weather likely had a lot to do w/ it. I'd bet it'd be at least a tenth quicker in the same weather you ran the 12.10 in previously. The new cam along w/ a looser converter will def. wake it up.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2519937
07/10/18 11:43 AM
07/10/18 11:43 AM
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fast68plymouth
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I wouldn’t be surprised if the lifters are giving up at whatever rpm 110mph is.
I’d schedule a few pulls on a local chassis dyno.
The 60’ is soft if you’re looking to get into that mid-11 zone.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2519966
07/10/18 01:06 PM
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It will be going on the scales at work tonight. I will update later. Hopefully I can get out to the track in a week or two to verify I am getting enough fuel. If I am, do you guys think putting the new cam in before I get the converter will hurt performance at the track?
Last edited by 6pakdakota; 07/10/18 01:06 PM.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2519976
07/10/18 01:34 PM
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MarkZ
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Nothing of a technical nature to add, but damn, I love that truck. That's bad ass.
1987 Fifth Avenue - 512/518/D60
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Re: Truck not performing as expected. Need help!
[Re: MarkZ]
#2519991
07/10/18 02:08 PM
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ZIPPY
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Nothing of a technical nature to add, but damn, I love that truck. That's bad ass. That thing is super cool. If you decide to go the chassis dyno route, Jake's has a pretty nice one + alot of experience to go with it.
Rich H.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2520050
07/10/18 04:13 PM
07/10/18 04:13 PM
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fast68plymouth
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The new cam and the 3000 stall won’t play very well together.
In fact, I wouldn’t consider the current 250@.050 hyd cam and the 3000 converter to be a very good match.
I’m sure that’s a lot(most?) of why the 60’ is a bit soft.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2520385
07/11/18 09:07 AM
07/11/18 09:07 AM
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OUTLAWD
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A lightweight!
I think the weather had to contribute a decent amount, and will agree with the others that the converter is too tight.
I have a similar mild 493 in my Plymouth, the 9.5" converter flashes to ~4400. Even the old off the shelf 10" "3000 stall" flashed to ~4k. I normally run 3.55's and a 28" tire and weigh 3700 lb at the line.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: OUTLAWD]
#2520394
07/11/18 09:53 AM
07/11/18 09:53 AM
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6pakdakota
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A lightweight!
I think the weather had to contribute a decent amount, and will agree with the others that the converter is too tight.
I have a similar mild 493 in my Plymouth, the 9.5" converter flashes to ~4400. Even the old off the shelf 10" "3000 stall" flashed to ~4k. I normally run 3.55's and a 28" tire and weigh 3700 lb at the line. It is pretty light for an all steel 1/2 ton truck. Lol. What is your combo and what does it run? If you don’t mind me asking.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2520437
07/11/18 11:42 AM
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fast68plymouth
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Just a little tidbit...... and you may already be aware of this.......
But the fuel level setting on those demons isn’t like the old holleys(bottom of the hole). I usually run those with the fuel sitting about 2/3 up the sight glass, set with the engine running.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: fast68plymouth]
#2521927
07/14/18 08:23 PM
07/14/18 08:23 PM
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6pakdakota
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Just a little tidbit...... and you may already be aware of this.......
But the fuel level setting on those demons isn’t like the old holleys(bottom of the hole). I usually run those with the fuel sitting about 2/3 up the sight glass, set with the engine running. Thank you. I will double check the float level. What heat range plugs do you guys recommend? I am currently running number 8 ngk plugs, but I know nothing about heat ranges.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2521933
07/14/18 08:47 PM
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fast68plymouth
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10.5:1? I’d go with 6’s.
I don’t know where you’ve been shifting, but I’d try a couple passes shifting at like 55-5600..... see what happens. Make note of what the rpm is crossing the stripe.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522152
07/15/18 03:09 PM
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I replaced the fuel filter with a high flow filter and put on a fuel pressure gauge. The fuel pressure is dropping to about 4 psi during the run. I also recorded the tach during a pass. It looks like the converter might be flashing closer to 3500-3600 and not 3000. It looks like it might be time for an electric pump. Mechanical pumps have their limitations for sure and a good electric pump when mounted and wired into relays can last for years............I'd go that route and keep fuel pressure 5-6 lbs according to what needle n seats you run............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522153
07/15/18 03:13 PM
07/15/18 03:13 PM
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GTX MATT
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I had a Carter 6903 on my 440 with stealth heads and a similar size cam, and was dropping to 3 PSI at WOT even in 1st gear. Also had crappy Hush Thrush mufflers I originally bought just to keep it quiet temporarily when the motor was fresh. I put an Aeromotive electric on and 20 inch cash Ultra Flos. The car is quieter, way more responsive, and feels like it picked up 50-100 hp.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Truck not performing as expected. Need help!
[Re: forphorty]
#2522154
07/15/18 03:14 PM
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6pakdakota
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1 3/4 headers are a little small for a 493 It has 2” headers now.
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Re: Truck not performing as expected. Need help!
[Re: GTX MATT]
#2522156
07/15/18 03:18 PM
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6pakdakota
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I had a Carter 6903 on my 440 with stealth heads and a similar size cam, and was dropping to 3 PSI at WOT even in 1st gear. Also had crappy Hush Thrush mufflers I originally bought just to keep it quiet temporarily when the motor was fresh. I put an Aeromotive electric on and 20 inch cash Ultra Flos. The car is quieter, way more responsive, and feels like it picked up 50-100 hp. I sure hope mine does the same.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522230
07/15/18 06:17 PM
07/15/18 06:17 PM
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I replaced the fuel filter with a high flow filter and put on a fuel pressure gauge. The fuel pressure is dropping to about 4 psi during the run. I also recorded the tach during a pass. It looks like the converter might be flashing closer to 3500-3600 and not 3000. It looks like it might be time for an electric pump. What RPM were you shifting at
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's
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Re: Truck not performing as expected. Need help!
[Re: Thumperdart]
#2522240
07/15/18 07:08 PM
07/15/18 07:08 PM
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Dom.. I gave my buddy your number and he will call.. if you can see if you can help him out on his carb.. thanks
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Re: Truck not performing as expected. Need help!
[Re: MR_P_BODY]
#2522270
07/15/18 08:39 PM
07/15/18 08:39 PM
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Dom.. I gave my buddy your number and he will call.. if you can see if you can help him out on his carb.. thanks Cool Mike,much appreciated and will hook him up...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Truck not performing as expected. Need help!
[Re: 67mprfan]
#2522275
07/15/18 08:52 PM
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I replaced the fuel filter with a high flow filter and put on a fuel pressure gauge. The fuel pressure is dropping to about 4 psi during the run. I also recorded the tach during a pass. It looks like the converter might be flashing closer to 3500-3600 and not 3000. It looks like it might be time for an electric pump. What RPM were you shifting at I was shifting at 5600-5700 trap at 57-5800. It looks like the converter is slipping about 12% also. I definitely have a lot of work to do on this thing.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522307
07/15/18 10:20 PM
07/15/18 10:20 PM
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fast68plymouth
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12% slippage from a 3500 converter is pretty bad
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: fast68plymouth]
#2522351
07/15/18 11:31 PM
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12% slippage from a 3500 converter is pretty bad That is what I was thinking. I don’t think an 11 inch converter should flash that high either. Lol.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522516
07/16/18 12:48 PM
07/16/18 12:48 PM
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I had a Carter 6903 on my 440 with stealth heads and a similar size cam, and was dropping to 3 PSI at WOT even in 1st gear. Also had crappy Hush Thrush mufflers I originally bought just to keep it quiet temporarily when the motor was fresh. I put an Aeromotive electric on and 20 inch cash Ultra Flos. The car is quieter, way more responsive, and feels like it picked up 50-100 hp. I sure hope mine does the same. My old SB Dart would drop to ~1 psi during a run with the mech pump. installed 1/2" feed and return and an electric pump, fuel pressure was constant but the car was no faster...YMMV Also, it needs a bigger carb! Mine would pick up ~0.2 going from 750 to 950.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522521
07/16/18 12:56 PM
07/16/18 12:56 PM
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A lightweight!
I think the weather had to contribute a decent amount, and will agree with the others that the converter is too tight.
I have a similar mild 493 in my Plymouth, the 9.5" converter flashes to ~4400. Even the old off the shelf 10" "3000 stall" flashed to ~4k. I normally run 3.55's and a 28" tire and weigh 3700 lb at the line. It is pretty light for an all steel 1/2 ton truck. Lol. What is your combo and what does it run? If you don’t mind me asking. Combo: 66 Belv 493; 10.25:1 -516 heads, big valves 4150 M1 w/ FITech 520/520 260/266 @ 0.050 TTI 2" headers, 3.5 x-pipe, muffs and dumps 727; 9.5" converter, flashes to ~4400 8 3/4; 3.55's tires vary, but normally run a 28" radial Last year I was playing with a small plate kit, so didn't have too many runs on motor, ran 11.31 @ 118 at Milan with ~1700' air last time out, and 10.83 with a 0.050 jet in the plate... Post up next time your are heading out, I'll try to make the trek. I used to work in Ann Arbor, so it was easy to shoot down to Milan, now I work in Pontiac...
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522530
07/16/18 01:13 PM
07/16/18 01:13 PM
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fast68plymouth
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It wouldn’t surprise me if there are valvetrain stability issues setting in with the motor at 5800rpm through the traps.
Using the butt dyno to diag that situation can be tough.
If your perception is that the motor feels really strong well past 6k in 2nd gear, you might be okay........ but a few pulls on a chassis dyno could reveal something.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2522532
07/16/18 01:16 PM
07/16/18 01:16 PM
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I have to be honest with you, I didn't read all of your specifics the first time through (on my phone). I didn't catch the fact that its a stroker, and I assumed this was a heavy 3800-4000 lb truck. MAYBE I'm missing something here, but given that its stroked and your truck is that light I would think you should be running low 11s @ 118-120 sorted out. How the heck did you get the truck that light? With that bigger cam you have I would think you had a shot at a 10.99 with the right converter once you slide that in, again unless I'm missing something. Do you know what those heads flow? I thought they were in the 260-270 neighborhood @ 600 lift?
I'd say upgrade the fuel system and go from there. My car did not show symptoms of being under fueled. In fact, I could jet it up and and peg my wideband at 10.0 at the hit, but my fuel curve was completely messed up and it would lean out at the top of every gear. Getting WOT in the 13.0 range made a big difference in the performance, but it was coming up to 14.0-14.5 at 6000 RPM. Very difficult to read the wideband too because it was bouncing alot on its way up. The car wouldn't nose over, and it revved up quick, just lacked torque. Fuel pressure would also drop much more drastically once warmed up (vapor locking).
I'm not sure what you're running for fuel, modern pump fuel is more problematic with a mechanical fuel pump too. Its designed to vaporize quickly, which is good for FI applications, but with the mechanical pumps putting it under a vacuum it vaporizes even easier, increasing the chances of vapor lock.
Basic stuff, but what is your ignition timing/curve, and have you verified that TDC on the balancer is true TDC? Did you degree the cam, and do you know what cranking compression or leakdown is? Are you SURE you're getting WOT with that trick throttle cable bracket there?
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Truck not performing as expected. Need help!
[Re: GTX MATT]
#2522549
07/16/18 01:48 PM
07/16/18 01:48 PM
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Put the solid cam in an ditch the power steering would be my first moves. probably a moroso waterpump drive and electric fan also/next. If I remember the engine compartment pic you have a pulley driven fan, waterpump, and power steering there is 2 tenths right there. I agree on the carb and converter but those are more money. Altogether though: solid cam is probably .2 getting rid of mechanical accessories .2 1050 dominator .2 (there is et to be gained from an intake and spacer swap but I'll leave that out for this purpose) converter maybey .3-.5 should be 11.2-11.00 (maybey 10.90's) combo based off the current 12.10 et It should have an electric pump also. It doesn't have to be fancy either. My buddy has a bbc vette with a holley blue pump and has been going 9.70's for years with it. Not my first choice but it works.
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Re: Truck not performing as expected. Need help!
[Re: OUTLAWD]
#2522801
07/16/18 09:25 PM
07/16/18 09:25 PM
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6pakdakota
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A lightweight!
I think the weather had to contribute a decent amount, and will agree with the others that the converter is too tight.
I have a similar mild 493 in my Plymouth, the 9.5" converter flashes to ~4400. Even the old off the shelf 10" "3000 stall" flashed to ~4k. I normally run 3.55's and a 28" tire and weigh 3700 lb at the line. It is pretty light for an all steel 1/2 ton truck. Lol. What is your combo and what does it run? If you don’t mind me asking. Combo: 66 Belv 493; 10.25:1 -516 heads, big valves 4150 M1 w/ FITech 520/520 260/266 @ 0.050 TTI 2" headers, 3.5 x-pipe, muffs and dumps 727; 9.5" converter, flashes to ~4400 8 3/4; 3.55's tires vary, but normally run a 28" radial Last year I was playing with a small plate kit, so didn't have too many runs on motor, ran 11.31 @ 118 at Milan with ~1700' air last time out, and 10.83 with a 0.050 jet in the plate... Post up next time your are heading out, I'll try to make the trek. I used to work in Ann Arbor, so it was easy to shoot down to Milan, now I work in Pontiac... That sounds like a good running combo. What is a 0.050 jet? About 75 hp? After my truck is sorted out, i would like to try a 150 shot. How do you like the FITech?
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2523050
07/17/18 01:43 PM
07/17/18 01:43 PM
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That sounds like a good running combo. What is a 0.050 jet? About 75 hp? After my truck is sorted out, i would like to try a 150 shot. How do you like the FITech?
Should be around a ~90 HP shot. I wanted to up it to a 150-175 shot last year, but ran out of decent days. You get what you pay for with the FITech. It evidently only flows ~850 CFM, which makes sense why it hasn't slowed the car down compared to my old 950HP PN80496 which also flows ~830...but it might pick up with more flow. I should stop playing around and put real heads/cam on it
Last edited by OUTLAWD; 07/17/18 01:52 PM.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2523067
07/17/18 02:30 PM
07/17/18 02:30 PM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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I should stop playing around and put real heads/cam on it Be interesting to see what a set of heads....... and no other changes....... would do.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: fast68plymouth]
#2523220
07/17/18 06:55 PM
07/17/18 06:55 PM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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I should stop playing around and put real heads/cam on it Be interesting to see what a set of heads....... and no other changes....... would do. Agreed. Keeping this cam, I'd lean towards the TF240 head, but if I were to step up the cam, I might entertain the TF270 with MW ports.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2523268
07/17/18 09:37 PM
07/17/18 09:37 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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I was shifting at 5600-5700 trap at 57-5800. It looks like the converter is slipping about 12% also. I definitely have a lot of work to do on this thing. You should use a seamstress tape to measure the tires actual circumference in the middle of the tread pattern and use that for your converter slippage calculations, not all tire heights are the same as advertised I learned that lesson a long time ago when I bought a pair of drag slicks that had over three inches difference in circumference between the two tires The stupid car started driving sideway away from the starting line at WOT It didn't do it with the other tires so I finally figured out it was in the new tires, nothing else I've bought and used 9x30x15 inch drag slicks that varied in circumference from 92.5 inch to 96.75 Once I found out that I could get and legally use the taller tires those were the ones I bought and used from then on
Last edited by Cab_Burge; 07/17/18 09:41 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Truck not performing as expected. Need help!
[Re: Cab_Burge]
#2523272
07/17/18 09:43 PM
07/17/18 09:43 PM
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Joined: Oct 2010
Posts: 156 michigan
6pakdakota
OP
member
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OP
member
Joined: Oct 2010
Posts: 156
michigan
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I was shifting at 5600-5700 trap at 57-5800. It looks like the converter is slipping about 12% also. I definitely have a lot of work to do on this thing. You should use a seamstress tape to measure the tires actual circumference in the middle of the tread pattern and use that for your converter slippage calculations, not all tire heights are the same as advertised I learned that lesson a long time ago when I bought a pair of drag slicks that had over three inches difference in circumference between the two tires The stupid car started driving sideway away from the starting line at WOT It didn't do it with the other tires so I finally figured out it was in the new tires, nothing else I've bought and used 9x30x15 inch drag slicks that varied in circumference from 92.5 inch to 96.75 Once I found out that I could get and legally use the taller tires those were the ones I bought and used from then on I never thought about that. I will have to measure them. Thanks.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2556824
09/30/18 11:37 PM
09/30/18 11:37 PM
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Joined: Dec 2006
Posts: 2,110 Byron, NY
W.I.N. Racing
top fuel
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top fuel
Joined: Dec 2006
Posts: 2,110
Byron, NY
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If you want to pick up MPH replace that MSD 6 with a 7. When I had similar results as you, swapped in a 7al in place of a 6al and picked up 5mph
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2556938
10/01/18 11:27 AM
10/01/18 11:27 AM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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The moroso chart shows 110 is good for an 11.90, so your ET is much better than the speed.
I’m still leaning towards valvetrain issues.
How much stall from the new converter?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Truck not performing as expected. Need help!
[Re: fast68plymouth]
#2556977
10/01/18 12:43 PM
10/01/18 12:43 PM
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Joined: Oct 2010
Posts: 156 michigan
6pakdakota
OP
member
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OP
member
Joined: Oct 2010
Posts: 156
michigan
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The moroso chart shows 110 is good for an 11.90, so your ET is much better than the speed.
I’m still leaning towards valvetrain issues.
How much stall from the new converter? I’m with you on the valve train issue. The new converter is flashing to about 4300-4400 rpm.
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Re: Truck not performing as expected. Need help!
[Re: 6pakdakota]
#2558139
10/03/18 10:35 AM
10/03/18 10:35 AM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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How'd you make out on Saturday? I think I saw the truck, but had to leave early
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Truck not performing as expected. Need help!
[Re: OUTLAWD]
#2558618
10/03/18 10:27 PM
10/03/18 10:27 PM
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Joined: Oct 2010
Posts: 156 michigan
6pakdakota
OP
member
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OP
member
Joined: Oct 2010
Posts: 156
michigan
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How'd you make out on Saturday? I think I saw the truck, but had to leave early You should have said hi. I made it to the final against a Roadrunner, where I lost by .008 seconds. Here is a video from my back bumper racing a friend in a fox body. https://youtu.be/T_JygdfX6fE
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Re: Truck not performing as expected. Need help! Update
[Re: 6pakdakota]
#2558854
10/04/18 12:28 PM
10/04/18 12:28 PM
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Joined: Apr 2012
Posts: 59 Florida
Sweet5ltr
member
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member
Joined: Apr 2012
Posts: 59
Florida
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Well, let's look at the basics here.
Clutch fan or mechanical fan? Proven 30-HP loss at 5,000 RPM with a mechanical fan, near 6,000 RPM, probably quiet a bit more. If it doesn't have a fan clutch, that's the easiest power you'll make right now.
Get rid of the mechanical fuel pump, you paid -big money- to stroke the wedge to 493ci and purchase aluminum heads, a simple Walbro 255 with an Aeromotive regulator / return line will support more power than the block is capable of. That's a premium OEM pump and cost around $100. You'll never have a pressure drop and it will remove vapor lock related issues.
Mechanical water pumps don't draw that much power through parasitic drag, very slight decrease over running an expensive, failure prone electric water pump.
Sidewinder heads flow around 250 - CFM @ .500" lift (ootb, 270 - CFM with bowl work), which can support well over 500 - HP, but the MPH shows you aren't making anywhere near that. New Challenger Scat Pack weighs 4,400 lbs with driver. They run 115 MPH in the quarter with around 430 RWHP.
Your combination is mismatched, 30" drag radial, 4.10 gears, 4,000 (guess) 9.5" converter, 2" headers, 496-cubes, dual-plane intake (Indy, known for core shift), .519" flat-tappet (real lazy) camshaft, with heads that flow 270-CFM @ .500" lift (after bowl work).
This is begging for a single-plane intake (with a lot of port volume) and a SFT / Roller camshaft. You're leaving so much power on the table, this should be making enough power to be a low-11 / high-10 second D100.
Last edited by Sweet5ltr; 10/04/18 12:28 PM.
1969 Plymouth Road Runner (440 w/ Boost! RIP) now a low-deck 470 with hotchkis suspension, nascar boom tube exhaust, & big brakes.
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Re: Truck not performing as expected. Need help! Update
[Re: 6pakdakota]
#2616550
02/03/19 06:57 PM
02/03/19 06:57 PM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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If valvetrain instability is suspected, it might be worthwhile contacting me to see how far off the geometry is, or if there might be other issues. From the photo of your valvetrain, it doesn't appear that anything was done to correct the rocker geometry, so that is likely a contributing factor.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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