1991 GTP 5 Speed Turbo DONE!!

[Sonyman]

Man you get definately get the props from here. Good to see a turbo on 3.4 DOHC, say, you gotta pic of your muffler setup?

[grandprixgtp_91]

No, unfortunatly i have no pics of the exhaust, im going to redo it in the spring, basically its 3" pipe from the turbo to the magnaflow high flow cat, then stock pipes to the mufflers, which are 2.5" flowmaster 40's series original flow mufflers.

Jake

[no_doz]

you have created a true masterpiece of machinery-how exactly did you go about modifying the code to change the a/f & spark timing & etc...? & how far can you go on a stock tgp ecm boost wise before you run into problems? any help is GREATLY appreciated oh masterful one. PLEASE can i see a video of this beast with no music or anything, just it doing burnouts & revving & spooling -drool-

[LuminaSS]

very nice. what i look forward to doing with this slowass 3.1L once I get the top end. very nice job. was this a kit or was all of this custom done? also what kind of computer are you using? What kinda of gas mpgs are you getting also..

sorry for the questions. i just love the bottom end torque from turboed motors and i really am sold on turboing this 3.1L once i have the better flowing top end.

[davida1_hiwaay_net]

Jake; that looks awesome! Videos good, too. Turbonetics is the way to go, have 2 of them and have ripped the doors off of many V8's, and too many imports to count.

The way you have "stacked mods" on your engine with the internal go-fast upgrades as well as the turbo should make for an extremely powerful engine.

I've got a 60°V6 and a 90°V6 (Buick engine) with turbos on them. Learning curve can be steep but once you go turbo you'll never go back!!!!

60°V6 Turbo: http://www.cardomain.com/ride/2948519
Buick 3.8SFI Turbo: http://www.cardomain.com/ride/2948544

Thanks for sharing the pictures! Please keep posting how the tuning phase goes. That is where I am at with my 3.8 turbo. Getting there but still a little ways to go!
David

[ForcedFirebird]

What size turbine is that? Appears to be about .63 t3?

[davida1_hiwaay_net]

What size turbine is that? Appears to be about .63 t3?

If you're talking to me, the 3.8 has a .63 A/R T3 turbine housing, with a non-standard wheel. Specs show it good for 475 HP.

Thanks,
David

[kris gtwhat?]

sweet stuff man good job

[bob442]

i'm impressed

[tonygtp]

where did you get the turbo manifold from? and other parts ect lol

[Joseph Upson]

Jake; that looks awesome! Videos good, too. Turbonetics is the way to go, have 2 of them and have ripped the doors off of many V8's, and too many imports to count.

The way you have "stacked mods" on your engine with the internal go-fast upgrades as well as the turbo should make for an extremely powerful engine.

I've got a 60°V6 and a 90°V6 (Buick engine) with turbos on them. Learning curve can be steep but once you go turbo you'll never go back!!!!

60°V6 Turbo: http://www.cardomain.com/ride/2948519
Buick 3.8SFI Turbo: http://www.cardomain.com/ride/2948544

Thanks for sharing the pictures! Please keep posting how the tuning phase goes. That is where I am at with my 3.8 turbo. Getting there but still a little ways to go!
David

You are turbokinetic over on the code59 forum, I sent you a pm over there inquiring about what you did to get code59 to run your DIS ignition module as I along with a couple others are having trouble finding the right settings for the spark limits to stay out of limp mode and allow the engine to run. I viewed your link yesterday but was not able to see the info on the Buick setup that I viewed in the link you posted here.

code59 offers a lot more boost freedom than the turbo grand prix code so what did you do?

[TiredGXP]

You are turbokinetic over on the code59 forum, I sent you a pm over there inquiring about what you did to get code59 to run your DIS ignition module as I along with a couple others are having trouble finding the right settings for the spark limits to stay out of limp mode and allow the engine to run. I viewed your link yesterday but was not able to see the info on the Buick setup that I viewed in the link you posted here.

code59 offers a lot more boost freedom than the turbo grand prix code so what did you do?

I'll second that - enquiring minds want to know!

[davida1_hiwaay_net]

You are turbokinetic over on the code59 forum

Yep, that's me! That's my screen name everywhere but here. I screwed up registering here and lost my original login. Could not get things straightened out so I made another login.

For some reason Code59 forum does not send me motices when I get PM's or replies. Sorry about that - I would be happy to explain the DIS setup.

Code59 ROCKS, and I am definately going to convert my turbocharged 60° motor to 7749 / $59 when it gets a reuild.

There are several constants that have to be changed. The most important are the total spark bias, and the mimimum and maximum advance/ retard relative to reference.

Chevy Distributor numbers from stock Sy/Ty calibration...
Max Advance Relative to ref pulse:46.76°
Max Retard rel to ref:0°
Ref angle:0°
Boost Spark Bias:21.80°
Coolant Spark Bias:20.04°

The Buick DIS system sends reference pulses 30° after TDC, which is taken care of by the "Ref angle" and "Boost Advance" bias. By lowering those numbers I counteracted the "30° of retard" caused by the DIS.

I beleive the 60° motors DIS system has a different reference angle. Someone with a factory 60° DIS calibration could look at it and tell you. IIRC it is 70°????

Here is a way to convert a cal from distributor to DIS if you know your DIS refernece angle for the crank trigger.

ADD the reference angle to the "max advance relative to reference pulse" value.

The "reference angle" and the 2 "spark bias" constants all do the same thing. As you LOWER them, the spark is ADVANCED across the board, just like "turning the distributor" in the block. Since it is advancing in the ECM's timing control system, the limit on max advance has to be raised to allow this to work.

LOWER the 3 above constants total by the reference angle of your DIS system. The total of the amount subtracted from all 3 should add up to your DIS reference angle.

If there is not enough range to get your DIS to work, you can select the whole spark table and "offset" it by the required amount to get the timing correct. There are at least 2 tables that can be offset this way to get sufficient advance for DIS.

Since my engine is a custom setup there is no "factory timing setting" to verify with a timing light. I did it by feel using a real-time emulator so my numbers don't add up to the exact reference angle of the Buick system. However the knock sensor system feedback, engine performance, and smoothness are enough proof to me that it is appropriate. You would probably want to verify the timing if you converted your motor to DIS and there was any question about the position of the crank trigger.

My tune is still a work in progress and the numbers are confusing beause mine was trial and error. It works that way and hopefully it explains what you can do to adapt a cal to DIS.

Hope this helps!

Later,
David

[grandprixgtp_91]

wow i never realized this thread was hijacked lmfao, lol i dont care, its all good.

Jake

[davida1_hiwaay_net]

wow i never realized this thread was hijacked lmfao, lol i dont care, its all good.

Jake

I didn't want to jack your thread - but also hate to ignore anyone.

How is the tuning going? I'm curious how your clutch and transmission will hold up. I hope to get the 4T65E in my car next week.

Thanks for sharing your project here!
David