Author Topic: I don't even know where to start.  (Read 915 times)

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Offline Crash

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I don't even know where to start.
« on: November 20, 2009, 07:20:22 AM »
Alright so I bought this car from my father in-law. He put a crap load of money into it, but never tuned on it. I've got parts all over for this thing. With all the stuff I have on the car it still only runs in the 15's. From what I have been reading, it should be in the high 12's low 13's. Heres what I got.

Engine:
Forged lower
Bored .30 over
P&P heads and intake
Bigger valves (Don't know exactly what size.)
9:1 Compression
Comp Cams (Custom ground for the set-up. Would have to look up specs.)
1.6 Rockers
Triple wound springs
165 thermostat

Turbo:
GT28RS T3 Flange .63 A/R
Jeff M Crossover
Stock exhaust no mufflers
Seqentual BOV
E-boost2 Boost controller
Cone on turbo filter
Maxin 13.5 #'s

Fuel:
36# injectors (29# on run)
Walbaro 255 fuel pump (stock on run)

Misc.
Jeff M TG160 (slightly modded)
3 Bar Mapp (2 bar on run)

I have everything to tune with, I just don't know where to begin. I have read alot of stuff, but alot of it doesn't make any sense.

Emulator
Tuner pro RT
Chip burner
Innovate Motorsports Wide band

Does anybody have a bin file thats close to what I have? Then all I have to do is tweak. Does anybody want to help me tune, or live close to KC. Please I need some help.



1990 TGP, 28# injectors, GT28RS Turbo, Emulator, Custom ground Comp Cams, 15 PSI, Forged Lower, 8.5.1 Comp, Top Gun 160 Modified, Walboro 255, 3 inch down pipe, and exhaust, P&P heads and Intake.  K&N air filter.

Just turned 90,000
Still a work in progress.

Offline killinprixs

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Re: I don't even know where to start.
« Reply #1 on: November 20, 2009, 11:24:12 AM »
could it be the stock 1.9 inch downpipe? you have to be able to get the flow OUT before you can worry about getting more IN.  Tuning without a doubt will make a good difference but if the engine cant breath as it is, then you're surely not going to fully benefit from all your mods.   

Offline flybynite

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Re: I don't even know where to start.
« Reply #2 on: November 20, 2009, 06:15:02 PM »
Sounds like it would be a fun ride.. ;)  As for the tune, lets make it simple. The gt28rs is not a very large turbo so you should be able to use 24-28lb injectors. Without major modifications to the code that 3 bar map is useless, just utilize the stock 2 bar one. I have several tunes for different size injectors/turbos/etc.. I will send you a pm with more info...
1989 TGP Red/Tan #9. 1990 TGP Black/Tan 5 speed swapped #169
http://www.facebook.com/pages/AMP-Motorsports/145800075480198?sk=wall

Offline Crash

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Re: I don't even know where to start.
« Reply #3 on: November 21, 2009, 08:06:58 PM »
Now I know everything you read is not right, but from what I understand the GT28RS turbo is capable of 350 Hp. The 28# injectors are only good for 275 - 300. So to get the 350 I would need at least a 32#. I haven't had this thing dynoed yet, but desktop dyno puts the motor alone at 250+. with turbo I should be able to put 300 at the wheels. Obviously that hardly ever happens, but it gives you an idea. 

As far as the exhaust I didn't even think about that. Do I need to rebuild a bigger crossover?
1990 TGP, 28# injectors, GT28RS Turbo, Emulator, Custom ground Comp Cams, 15 PSI, Forged Lower, 8.5.1 Comp, Top Gun 160 Modified, Walboro 255, 3 inch down pipe, and exhaust, P&P heads and Intake.  K&N air filter.

Just turned 90,000
Still a work in progress.

Offline TGed

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Re: I don't even know where to start.
« Reply #4 on: November 21, 2009, 08:11:13 PM »
Bigger downpipe.  That is what you need to fabricate.

A bigger x-over is not needed, but now that I have a bigger x-over, I noticed I can spool faster, the boost comes on hard, and I have no evident proof of this, but I think my mpg picked up.  Could just be the tune. 
My x-over is by no means stock anymore either.
http://www.tgpforums.com/index.php/topic,5214.msg38936.html#new

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Offline Crash

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Re: I don't even know where to start.
« Reply #5 on: November 21, 2009, 08:27:21 PM »
I can do that. Has any removed the cats and just run exhaust, or does that create a back pressure issue?
1990 TGP, 28# injectors, GT28RS Turbo, Emulator, Custom ground Comp Cams, 15 PSI, Forged Lower, 8.5.1 Comp, Top Gun 160 Modified, Walboro 255, 3 inch down pipe, and exhaust, P&P heads and Intake.  K&N air filter.

Just turned 90,000
Still a work in progress.

Offline TGed

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Re: I don't even know where to start.
« Reply #6 on: November 21, 2009, 09:47:09 PM »
I don't have a catalyst converter and I run full 3".
http://www.tgpforums.com/index.php/topic,5214.msg38936.html#new

-Don't go around saying the world owes you a living; the world owes you nothing; it was here first.-

-Assume nothing, question everything.-

Offline flybynite

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Re: I don't even know where to start.
« Reply #7 on: November 22, 2009, 09:50:49 AM »
 I am running a t2871r, that is bigger than the t28rs.   ;)       http://www.tgpforums.com/index.php/topic,5570.0.html 
I have 30lb DOHC 3.4 injectors and at 14psi I have no problem getting 11.8 afr all the way up to the red line... I have been tuning the TGP platform since the late 90's. I have also tuned many other TGP's and my experience with the t28 is you only need 24-28lb injectors.. Anything you do to reduce/eliminate back pressure will only help you achieve you hp goals.
« Last Edit: November 22, 2009, 12:08:48 PM by flybynite »
1989 TGP Red/Tan #9. 1990 TGP Black/Tan 5 speed swapped #169
http://www.facebook.com/pages/AMP-Motorsports/145800075480198?sk=wall

Offline Crash

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Re: I don't even know where to start.
« Reply #8 on: November 23, 2009, 07:18:39 AM »
I was not douting your skills. That is just what I had read. I will try to contact you this week.
1990 TGP, 28# injectors, GT28RS Turbo, Emulator, Custom ground Comp Cams, 15 PSI, Forged Lower, 8.5.1 Comp, Top Gun 160 Modified, Walboro 255, 3 inch down pipe, and exhaust, P&P heads and Intake.  K&N air filter.

Just turned 90,000
Still a work in progress.

Offline Jonpro03

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Re: I don't even know where to start.
« Reply #9 on: November 23, 2009, 02:50:52 PM »
Is there a thread anywhere that'll teach me everything I'd need to know to start tuning?

1997 Grand Prix GTP coupe topswap
1990 Turbo Grand Prix Black/Tan Interior 15.05 1/4mile

Offline flybynite

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Re: I don't even know where to start.
« Reply #10 on: November 23, 2009, 07:19:36 PM »
Is there a thread anywhere that'll teach me everything I'd need to know to start tuning?
Ask and you shall receive...    :icon_mrgreen:

http://www.thirdgen.org/techboard/diy-prom/288763-prom-tuning-guide-book.html

Start with chapter 1 and keep in mind the 727(tgp computer) is the same as a 730. The 727 is an underhood version...   ;)
1989 TGP Red/Tan #9. 1990 TGP Black/Tan 5 speed swapped #169
http://www.facebook.com/pages/AMP-Motorsports/145800075480198?sk=wall