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Re: Finally got out to the track last night!!...
[Re: RobX4406]
#1052088
08/14/11 07:43 PM
08/14/11 07:43 PM
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Joined: Apr 2009
Posts: 3,415
Toronto
mshred
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Quote:
I think guys were assuming you weren't leaving matted and still had some pump shot left to play with.
The 4.5 will open earlier than a 3.5 would. Not sure how that would effect anything at the track because it's likely open from the time you mat it. If you had a vacuum gauge you could observe it when matting. You could test it at home, put it on the two step and see what it reads. If vacuum is below the PV number, it's open.
no, im definitely leaving matted...sitting on that 5k chip till the light goes green.
I thought about the pv too for the track, and im already leaving at WOT, not sure how it would affect things...but that garage test sounds like a good idea. This week before i get out to the track im gonna take the carb apart, reset the jets, add the secondary extentions and notched float, change squirters, and make sure the accelerator pumps are correct...i'll try the different pump cams out at the track and see what it likes...Im really hopint the car will run even harder after this 
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Re: Finally got out to the track last night!!...
[Re: Dodgem]
#1052089
08/14/11 07:44 PM
08/14/11 07:44 PM
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Joined: Apr 2009
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Toronto
mshred
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Quote:
will do!
http://www.youtube.com/watch?v=CksEflD0KwE
have to work out my 60 foot problems too!
Sweet, I have pictures of your GTX from a couple of years ago! One of the only mopars ive ever seen there! I will definitely stop by if your up there, so let me know
nice pass in that vid too
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Re: Finally got out to the track last night!!...
[Re: Dodgem]
#1052091
08/18/11 12:20 AM
08/18/11 12:20 AM
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Joined: Apr 2009
Posts: 3,415
Toronto
mshred
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So I just finished making some changes to my carburetor. I jetted the carb up from 75/76 to Brian's recommended specs of 74/80 (factory on this carb was 75/80). I also changed to a .31 squirter front and rear, and I also added the blue cams. I double checked my pump arm adjustments, and I also installed a secondary jet extension and notched float. Tommorow im going to do a little more fine tuning to see where im at with this, as I now have the ability to datalog with my AFR gauge via the computer- Gonna make a small pass just to get an idea of where I am jetting wise I am heading up to the track this friday night for test and tune, and I will be staying overnight to get some more runs in on the saturday. Can't wait, should be some more fun times Gonna fool around with the carb and tire pressure some and see what what happens
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Re: Finally got out to the track last night!!...
[Re: Stroker Scamp]
#1052093
08/21/11 01:37 PM
08/21/11 01:37 PM
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Joined: Apr 2009
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Toronto
mshred
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Well I got out to the track this past Friday with some better results than last time...starting to head in the right direction With the new jetting on the carb, tires at 12psi, caltracs on zero preload again with the shocks on 7, leaving at 5k off the two step, and I picked up mph right away and ran a 12.518 at 109.63mph. The car 60'ed a 1.78. I tried another run with everything the same but a 5500rpm launch instead and ran a 12.56 at 109.08, but 60's suffered to a 1.82 I made 7 passes again, but on 3 passes I missed 2nd-3rd gear (v-gate got trapped in the middle of the two gates, didnt push her hard enough), so i never really got to make all out passes...my 60's were all in the high 1.7's though, with the occasional 1.8. I tried stiffening the shocks up a little, up to 9, as well as airing up the tires, but it didnt make much of a difference. I also couldn't jet up at all since the crappy dual feed chrome line for the carb got all chewed up on the nuts when i began loosening them with a 1/2 line wrench (a brand new snap on one too!)...So that is going to have to be changed before next time too, since i dont know if the car had more in it or not mph wise. Best pass of the night was the last one- 12.496 at 109.98mph (i think it picked up due to the cool night air) with a measly 1.8 60' ft. I really think the car has more e/t in it, but my 60's are really sufferring due to my bog im still getting. I upped the tire pressure to 14psi about half way through the night, and it seemed to help a little. Next time out im thinking of trying them at 16psi and seeing what happens. Not sure what else to do, as the car didnt seem to like the higher launch rpm- it 60'ed worse and the suspension seemed like it wanted to hop. Im also thinking of next time going softer on the shocks instead of stiffer and seeing what happens, although i know it being a stick that may be counter productive, but its worth a try Gonna try and post some vids up so you guys can see the suspension working...im outta ideas on how to get rid of the bog- i think if i dropped my 60's to 1.7 flat, or even a high 1.6, i would definitely e/t a low 12, which would be awesome thanks to all for the help so far!
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052094
08/21/11 08:44 PM
08/21/11 08:44 PM
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Joined: Apr 2009
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Toronto
mshred
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here is an in car vid from my first time out launching at 4k...gives an idea of what the bog was like...its less leaving higher, but still there http://www.youtube.com/watch?v=bQF8OxVuyYUAnd here was a pass from last night to get an idea of how it was hooking....shocks were on 9 on this run, up from 7..and the tires were at 12 psi as opposed to the 9-10 i was running on my first outing...Im thinking the tires like less air as my 60's seemed better the first night, but the bog is definitely worse with the lower air pressure http://www.youtube.com/watch?v=YPEqli16UHE
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052095
08/21/11 09:01 PM
08/21/11 09:01 PM
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Joined: Aug 2003
Posts: 43,204
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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Last edited by Cab_Burge; 08/21/11 09:03 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Finally got out to the track last night!!...
[Re: Cab_Burge]
#1052096
08/21/11 09:27 PM
08/21/11 09:27 PM
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Joined: Jan 2007
Posts: 1,169
MI
68shifter
super stock
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super stock
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MI
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You said a centerforce clutch correct? Any idea of base pressure on that, I think around 3000 but I'm not sure. Also your rear tires, are they bias or radial? I dont think carb is your issue. Try lowering your launch rpm or keep adding tire psi. That thing has to slip/spin somewhere or 1st gear or your pig won't have many passes left. Good luck, real good looking car.
68' Barracuda (4 speed)
64' Savoy (4 speed)
65' Satellite (girl tranny)
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Re: Finally got out to the track last night!!...
[Re: Cab_Burge]
#1052097
08/21/11 09:34 PM
08/21/11 09:34 PM
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Joined: Jan 2003
Posts: 5,486
SoCal
Brian Hafliger
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It seems like the engine is being loaded real heavy when you let the clutch out...kinda like a 3000rpm converter when it wants a 5700rpm converter. I'm pretty sure you'd have to gear it really low to get rid of that. Just looks like not enough gear. But I know it's a street car so.... Plus it's spinning the tire pretty good. You need that front end to come up super easy. Pretty damn good results from a 4 row and low buck engine build! Such a pretty car too!! Now I need to go wax my pig  It's almost impossible to have a drag car and a street car all at the same time. Congrats on the new bests!! Brian
Brian Hafliger
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Re: Finally got out to the track last night!!...
[Re: Cab_Burge]
#1052098
08/22/11 12:00 AM
08/22/11 12:00 AM
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Joined: Apr 2009
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Toronto
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Quote:
Something you might want to try is take the throttle and hold it in the position it takes to make the motor turn 5000 RPM running and then shut the motor off, move the throttle to that position and then mat it, count how long the pump shot lasts   You might need a different pump cam or bigger or smaller squirters to see what work bests on your car The sqirters take a while to discharge all the fuel out of accelerator pump well You need enough pump shot to take it from the transition or idle circuit to the main circuit without the bog. All the stickshift SB cars I raced (including one with a 3.09 first gear and a 5.57 rear gear and 13x31x15 stick shift slicks) would bog some at WOT when I dump the clutch when racing  All the BB or Hemi stick cars would spin the tires    Ain't racing fun  
well I have gone to the blue squirters, which would seem to be more aggressive than the pinks i had before on hole #1. I also adjusted the pump arms...I guess I could try that thing of checking with the motor off...but im leaving with the throttle matted, so i can't seem to see it being a carb issue....but who knows....I will have to try and see
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Re: Finally got out to the track last night!!...
[Re: 68shifter]
#1052099
08/22/11 12:02 AM
08/22/11 12:02 AM
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Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
You said a centerforce clutch correct? Any idea of base pressure on that, I think around 3000 but I'm not sure.
Also your rear tires, are they bias or radial?
I dont think carb is your issue. Try lowering your launch rpm or keep adding tire psi.
That thing has to slip/spin somewhere or 1st gear or your pig won't have many passes left.
Good luck, real good looking car.
Yes, centerforce dual friction...and the base pressure on these increases the higher you launch it...but it seems that when i launch it lower, the bogging is worse, thats why i upped the launch rpm's
my tires are bias ply e/t streets...The tires are spinning about 1-2 revolutions on launch (or so it seems to me from looking at the video)..I was thinking of upping the air some more next time out and just seeing what it does
I am running a Dana 60 with 35 spline guts, so im not too worried about breakage, but i know it is definitely still possible, which is why im trying to get the car to spin a little off the launch
What would lowering the launch rpm do? just help not stress the driveline parts so much?
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Re: Finally got out to the track last night!!...
[Re: Brian Hafliger]
#1052100
08/22/11 12:07 AM
08/22/11 12:07 AM
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Toronto
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Quote:
It seems like the engine is being loaded real heavy when you let the clutch out...kinda like a 3000rpm converter when it wants a 5700rpm converter.
I'm pretty sure you'd have to gear it really low to get rid of that. Just looks like not enough gear. But I know it's a street car so....
Plus it's spinning the tire pretty good. You need that front end to come up super easy. Pretty damn good results from a 4 row and low buck engine build! Such a pretty car too!! Now I need to go wax my pig
It's almost impossible to have a drag car and a street car all at the same time. Congrats on the new bests!!
Brian
Hey Brian, i can't stand the compromises lol...I drive it to the track the two hours there and two hours back- with the 4.10's and 28's im spinning 3k the whole way, gets old real quick lol...I know it definitely needs more gear, probably a 4.56 or maybe more, but it just can't happen with how much i drive the car...just so its clear, the in car vid was a 4k launch...im launching the car at 5k now, which has seemed to be helping, but the bog is still there
The front end is coming up real well, couple of passes had daylight under the front tires...i think this bog is whats killing me, but even then, the car is running awesome for how simple of a combo it is..I can't thank you enough for the cam and heads, they flat out work ...I need to try jetting up, but as i said, i had troubles with my crappy dual feed line, so i have to get that sorted out first
Either way im having a blast, and its nice to tell guys I have a junkyard shortblock motor thats pushing my 3400lb pig to mid 12's with a 4 speed  
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052101
08/22/11 12:28 AM
08/22/11 12:28 AM
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Joined: Jan 2007
Posts: 1,169
MI
68shifter
super stock
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super stock
Joined: Jan 2007
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MI
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My reason on lowering launch rpm is to limit the load on the clutch. If you increase leave rpm your trying to move all that 3400 at once, plus more if base pressure increases. As compared you find must of us run around 720-1100 base pressure with the adjustable clutches to slip there. 2-3 revolutions of the tire is ideal upon leave, sorry couldn't see the tire, I'm on a small phone screen. Think of leaving like tying a rope around your waste and at the end of 50ft of slack is 3400 pounds...take of running...ouch. Increase rpm, longer rope, same result. Now use a "tow strap" that absorbs that energy and applies some at first and more later...just a thought. The car looks great and sounds great. Doesn't matter who owns one, a stick takes time to sort out and you just have to try alot of different stuff. If it was "automatic" your wife could do it  Keep up the good work.
68' Barracuda (4 speed)
64' Savoy (4 speed)
65' Satellite (girl tranny)
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052102
08/22/11 12:54 AM
08/22/11 12:54 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
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Posts: 12,271
Overpriced Housing Central
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Quote:
I need to try jetting up, but as i said, i had troubles with my crappy dual feed line, so i have to get that sorted out first
cut a 1.5" section out of the chrome line between your bowls and put a piece of hose in there with two clamps. No messing with the bowl fittings, swing bowl out and pull block.
Like this one.
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Re: Finally got out to the track last night!!...
[Re: 68shifter]
#1052103
08/22/11 07:10 PM
08/22/11 07:10 PM
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Joined: Apr 2009
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Toronto
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Quote:
My reason on lowering launch rpm is to limit the load on the clutch. If you increase leave rpm your trying to move all that 3400 at once, plus more if base pressure increases. As compared you find must of us run around 720-1100 base pressure with the adjustable clutches to slip there.
2-3 revolutions of the tire is ideal upon leave, sorry couldn't see the tire, I'm on a small phone screen.
Think of leaving like tying a rope around your waste and at the end of 50ft of slack is 3400 pounds...take of running...ouch. Increase rpm, longer rope, same result.
Now use a "tow strap" that absorbs that energy and applies some at first and more later...just a thought.
The car looks great and sounds great. Doesn't matter who owns one, a stick takes time to sort out and you just have to try alot of different stuff.
If it was "automatic" your wife could do it
Keep up the good work.
I see what you are saying...I guess im going to have to try that too...ideally i wish i could use an adjustable clutch, but i don't have the funds, and the car doesn't see the track enough for it (although i wish it did, but thats more a distance issue than anything).
And let me tell you, this car will NEVER be getting an automatic, i dont care if its got a brake or a manual vb...nothing is as fun as dumping the clutch off a two step and powershifting every gear...im addicted with no cure in sight! lol...plus if i go auto, im gonna need the matching purse and wallet for it, which I can't afford
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Re: Finally got out to the track last night!!...
[Re: RobX4406]
#1052104
08/22/11 07:10 PM
08/22/11 07:10 PM
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Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Quote:
I need to try jetting up, but as i said, i had troubles with my crappy dual feed line, so i have to get that sorted out first
cut a 1.5" section out of the chrome line between your bowls and put a piece of hose in there with two clamps. No messing with the bowl fittings, swing bowl out and pull block.
Like this one.
that is genius! why the heck didn't I think of something like that before man lol...thanks!
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Re: Finally got out to the track last night!!...
[Re: RobX4406]
#1052105
08/22/11 08:05 PM
08/22/11 08:05 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
Quote:
I need to try jetting up, but as i said, i had troubles with my crappy dual feed line, so i have to get that sorted out first
cut a 1.5" section out of the chrome line between your bowls and put a piece of hose in there with two clamps. No messing with the bowl fittings, swing bowl out and pull block.
Like this one.
You sure arent NHRA legal with all that hose
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