??'s for those of you that drag race regularly - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 25 (permalink) Old 08-09-2007, 10:24 PM Thread Starter
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??'s for those of you that drag race regularly

First off, I have had over 300 passes on the drag strip w/ my supercharged GTP that runs 12's, so you can save on the technicalities of the sport:Thumbup: ......

Anyway, I took my truck to U.S. 131 Motorsports park in Martin, MI yesterday. I first ran stock (19.9x), then 50hp (17.8x), then 75hp (17.7x). On all 3 runs, I only spooled to about 4-5 psi for fear of smoking the clutch too much (only has supposedly 15k on it, so it's not on it's last leg or anything). Also, I ran in 2wd, which cost me on the last run as I sat and spun off the line.

The questions are, what psi do you spool your turbo to?

Is it best to run in 4wd all the time?

Those of you w/ manuals, how much/how long can you spool the turbo before the clutch slips?

Also, what gear do you take off in? I took off in 1st (6-speed's 2nd forward gear)

Obviously power is a deciding factor, but generally I would like to know. The clutch is a stock hp one.

Any tips/help is greatly appreaciated, Garett

SOLD2004 Dodge 3500-Quadzilla XZ2, 6" Black Mitre Stacks, PPE, DTT Trans

SOLD Early '99 F-250 XLT, 4x4, 6-speed
Diesel Innovations chip: stock, 50, 75, 110hp, 4" lift, Eagle 140 Black 18x10's w/ 35x12.5 Nitto Mud Grapplers, 4" turbo back to dual 5" Aussie stacks

SOLD2000 Grand Prix GTP Sedan
12.83 @ 108.68 mph on street tires
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post #2 of 25 (permalink) Old 08-09-2007, 10:33 PM
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what do u mean "spool the turbo"? on the launch?

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post #3 of 25 (permalink) Old 08-09-2007, 10:33 PM Thread Starter
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Sorry, I meant bring the boost up, at the staging lights before the lights drop

SOLD2004 Dodge 3500-Quadzilla XZ2, 6" Black Mitre Stacks, PPE, DTT Trans

SOLD Early '99 F-250 XLT, 4x4, 6-speed
Diesel Innovations chip: stock, 50, 75, 110hp, 4" lift, Eagle 140 Black 18x10's w/ 35x12.5 Nitto Mud Grapplers, 4" turbo back to dual 5" Aussie stacks

SOLD2000 Grand Prix GTP Sedan
12.83 @ 108.68 mph on street tires
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post #4 of 25 (permalink) Old 08-09-2007, 10:51 PM
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Sorry to get off topic, but im interested in hearing about your GTP. Im working on a friends 99 Regal GS right now. It puts down a little over 400fwhp. I love it. Its a fully loaded buick that looks all stock but runs like a vette. haha. Right now the lower intake is getting welded. It cracked somehow. I think its because it was machined out cause it has an intercooler and the one area of the wall is thin. Were just gonna weld it and hope for the best.

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post #5 of 25 (permalink) Old 08-09-2007, 10:54 PM
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As far as 4WD, everyone I know with a 4x4 modded diesel runs in 4WD. Some guys with electronic transfer cases will try to disengage at the 330' or 660' mark, to reduce drag on the top end (better ET but worse consistency).

I only know a couple of people who do it with a manual trans. One (a common rail dodge dually) just tries to heel-toe the brake & accelerator while releasing the clutch pedal enough to build a little boost. I think he only gets a couple of pounds of boost at launch. The other runs a Lenco transmission in a full tube-chassis race truck. He has a 4-wheel line lock, with a brake pressure gauge to make sure he has sufficient holding power. He then uses the clutch and accelerator to build as much boost as he feels the track will hold (30+ psi).

When I had a single-tracker rearend, I would do a 10 psi dry burnout (right side tires spinning only), then build around 4-5 psi of boost at the line. It usually spun the tires, but it ran well when it hooked (16.80's). Now that I have a locker I do a wet burnout then leave barely above idle (it tends to wheel hop if I leave with any boost).

Regards,
Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD Crew Cab Dually, 271k miles
10 ISSPRO Prototype Performax™ gauges in Pillar & Overhead pods & sitting on dash, Tymar Intake, Gutted EBPV, Tymar 3x4" downpipe, Tymar 5" exhaust, Cat's hiding in the shed, Baby Swamps, Swamps tunes, Tricumulator springs and Accumulator Valve, Tru-Cool 4590 Trans Cooler, Lock-Right Locker
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1992 GMC Typhoon, 1973 Chevy Blazer with Pontiac 400, 1973 Trans-Am 455
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post #6 of 25 (permalink) Old 08-09-2007, 11:18 PM
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ok thought that was what you meant, well anytime u load the clutch like that at the line ur taking a big chance in smoking it, honestly i wouldnt do that, ive tried it in the past with cars i used to drag race and never had any luck. if anything id just bring the rpms up to about 3000 and let the clutch out gradually on the take off to keep the rpms up and get a load on the engine.

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post #7 of 25 (permalink) Old 08-09-2007, 11:20 PM
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maybe DP tuner can make you a drag race program that has a 2 step rev limiter, that would do the trick he he

2006 F350 XLT 4x4
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post #8 of 25 (permalink) Old 08-09-2007, 11:49 PM
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Quote:
Originally Posted by TurboTPI
Sorry to get off topic, but im interested in hearing about your GTP. Im working on a friends 99 Regal GS right now. It puts down a little over 400fwhp.
:
Okay, I want to hear more about your Firebird! I have toyed with the idea of having a fast & fun daily driver which I could competitively bracket race. I thought my Typhoon was going to be that (and it still may become it), but it has been too inconsistent.

Thanks,
Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD Crew Cab Dually, 271k miles
10 ISSPRO Prototype Performax™ gauges in Pillar & Overhead pods & sitting on dash, Tymar Intake, Gutted EBPV, Tymar 3x4" downpipe, Tymar 5" exhaust, Cat's hiding in the shed, Baby Swamps, Swamps tunes, Tricumulator springs and Accumulator Valve, Tru-Cool 4590 Trans Cooler, Lock-Right Locker
1998 S&S 9.5' slide-in camper
32' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET Super-Pro)
1992 GMC Typhoon, 1973 Chevy Blazer with Pontiac 400, 1973 Trans-Am 455
2000 VW Jetta TDI - Kerma tune, Der Chimera Stage II Clutch
NRA member and certified firearms instructor, GOA Life member, IDPA member
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post #9 of 25 (permalink) Old 08-10-2007, 12:35 AM
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Quote:
Originally Posted by Michael
:
Okay, I want to hear more about your Firebird!
, I saw that in his sig too. I had a Formula 350 years ago and loved that car. Definately wasn't sporting custom turbos or anything, but it was fun.
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post #10 of 25 (permalink) Old 08-10-2007, 01:20 AM Thread Starter
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Sounds like you have a heck of a car yourself TurboTPI. I wonder if I've heard of your buddy on the ClubGP, because there aren't many in the 350+ whp.
My car put down 285.7 whp last fall, but I have added headers and have a custom tune burned into my PCM. Sooo, it should be around 305 whp or so and probably 450 wt. Which is about 366hp/540ft-lbs at the crank....These little Supercharged V-6's make massive torque especially for a gas engine. The torque numbers they put down w/ turbo's are almost double the hp they make, like a diesel.
The mods I have are all from ZZPerformance in Grand Rapids, MI. They are as follows: ZZP VS cam (Custom CompCam stage 1 mild cam, makes a nice mild lope), Wizaird CAI, ZZP PCM (VS cam, 42.5# injector, 2.9 pulley, and IC files), SS IC, ported intake, TOG ceramic coated headers, ZZP stainless steel 3" DP, Rollermaster double roller timing chain set, and ZZP modular pulley system w/ sizes ranging from 3.4-2.8" (stock is 3.8").
The car pulls very hard all the way to about 120-130 mph, especially down low. 0-60 time I estimat at 4.5 sec, and my best run is a 12.83 @ 108.6 mph. Never have ran slicks because of the stock tranny (which is rated at 280ft-lbs, so you can see I'm waaay over that), so it has hit several 12's on street tires. Launching these cars is a b****h! They have massive torque steer, but the equal length CV axles do help. I can't imagine if they had CV's like an escort, lol

Hope I answered what you wanted to know.

SOLD2004 Dodge 3500-Quadzilla XZ2, 6" Black Mitre Stacks, PPE, DTT Trans

SOLD Early '99 F-250 XLT, 4x4, 6-speed
Diesel Innovations chip: stock, 50, 75, 110hp, 4" lift, Eagle 140 Black 18x10's w/ 35x12.5 Nitto Mud Grapplers, 4" turbo back to dual 5" Aussie stacks

SOLD2000 Grand Prix GTP Sedan
12.83 @ 108.68 mph on street tires
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