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Re: Truck not performing as expected. Need help!
[Re: fast68plymouth]
#2521927
07/14/18 07:23 PM
07/14/18 07:23 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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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 07:47 PM
07/14/18 07:47 PM
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Joined: Jan 2003
Posts: 14,545
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,545
So. Burlington, Vt.
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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 02:09 PM
07/15/18 02:09 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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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 02:13 PM
07/15/18 02:13 PM
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Joined: Jun 2006
Posts: 5,187
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,187
CT
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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 02:14 PM
07/15/18 02:14 PM
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Joined: Oct 2010
Posts: 156
michigan
6pakdakota
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OP
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Joined: Oct 2010
Posts: 156
michigan
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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 02:18 PM
07/15/18 02:18 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 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 05:17 PM
07/15/18 05:17 PM
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Joined: May 2005
Posts: 1,032
ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,032
ohio
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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 06:08 PM
07/15/18 06:08 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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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 07:39 PM
07/15/18 07:39 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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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 07:52 PM
07/15/18 07:52 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 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 09:20 PM
07/15/18 09:20 PM
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Joined: Jan 2003
Posts: 14,545
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,545
So. Burlington, Vt.
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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 10:31 PM
07/15/18 10:31 PM
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Joined: Oct 2010
Posts: 156
michigan
6pakdakota
OP
member
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OP
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Joined: Oct 2010
Posts: 156
michigan
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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 11:48 AM
07/16/18 11:48 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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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 11:56 AM
07/16/18 11:56 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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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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