98 2.4 twin cam supercharged tune [Archive] - Grand Am Owners Club Forums

CraiGT

05-23-2008, 11:22 PM

Ive finally saved enough money to get a crate motor and supercharger in my car.

Got it all together and runnin and pulled the plugs... BLACK.

My GTPs injectors were installed on the GT. I need a tune.

Everyone I know does only Cavaliers and Sunfires. They tell me the GA computer or program is different.

Does anyone have a tune they could help me out with? stock pulley, stock internals, stock everything but the injectors. And 91 octane of course.

gt00

05-23-2008, 11:41 PM

Yeah..... running a little rich :D I guess those injectors aren't happening with that computer . Have you tried the stock ones for now ?

CraiGT

05-24-2008, 12:02 AM

For now? No. I didnt. Not a bad idea if I wanted to try and move it, but its not moving until I have HPTuners hooked up to it.

I was just hoping for a tune to get that little boost of help ya know. This car has been a long project lol.

CraiGT

05-24-2008, 12:18 PM

Ralph

05-25-2008, 06:36 AM

you need HP tuners

CraiGT

05-25-2008, 11:59 AM

I have it...

I just need somewhere to start...

Its looking like I will just have to start from the ground up.

loud2kse

05-26-2008, 02:04 PM

you may wanna check j-body.org or azjbo.org They are j-body sites, but the computers really aren't that different, so you can use the same theories and steps for tuning yours.

btw where in AZ are you at?

CraiGT

05-27-2008, 03:26 AM

I am on J-body.org and part of AZjbody. Same username. They told me to check here.

Now it looks like Im getting the toss around. I will have to start from scratch and work from there.

Right now I am in Glendale but soon moving to 1 of 3 places. Chandler/Mesa/Tempe.

Matt95GT

05-27-2008, 10:49 AM

Ok, so you already have the larger injectors + 2 bar MAP + HP tuners. That's a good start. What about wideband or other means of tuning feedback? You cannot tune blind.

Have you tried the stock ones for now ?

That's a bad idea. If he boosts, it will run very lean... and eventually grenade the bottom end.

gt00

05-27-2008, 01:34 PM

That's a bad idea. If he boosts, it will run very lean... and eventually grenade the bottom end.Yeah , i know , it was just to get it running temporarily till he sorted it out properly. Just to move the car or whatever... :)

spy

05-27-2008, 06:11 PM

Yeah , i know , it was just to get it running temporarily till he sorted it out properly. Just to move the car or whatever... :)

still not a good idea.

spy

05-27-2008, 06:14 PM

Ok, I have searched and trying to understand the boosted tuning thing.

I need to use the 2 bar map sensor that came with the kit and then make a "fake" 2 bar tune?

Again, can anyone help me with a tune for this?

you have a couple options...

Do what MATT95GT did on his car and copy his fuel setup.

Attempt to fool the PCM for a 2bar map.

Or rewire your car w/ a 2001+ PCM & repin some of the pinouts so everything is correct. This way you can get the appropriate 2bar programming that goes w/ the supercharger downloaded into the PCM. Then you can use HPTuners to fine tune that, for whatever size fuel injectors your heart desires.

Or you can buy my Electromotive TEC III.

CraiGT

05-27-2008, 11:02 PM

Ok, so you already have the larger injectors + 2 bar MAP + HP tuners. That's a good start. What about wideband or other means of tuning feedback? You cannot tune blind.

My buddy with the software has an extra wideband to tune with so yes, that will be included.

Or rewire your car w/ a 2001+ PCM & repin some of the pinouts so everything is correct. This way you can get the appropriate 2bar programming that goes w/ the supercharger downloaded into the PCM.

I thought I read something about that and it doesnt turn out quite well. I remember reading the BCM is different and the wiring getting goofy damn I cant remember.

I read this like a year ago. But after I added it all together, and asked some jbody people, I came to the conclusion that this was not the direction to go.

I really do appriciate the input guys. If you got any more, keep it coming.

urweak

05-27-2008, 11:18 PM

CraiGT

05-27-2008, 11:40 PM

have you checked out these two threads on the org?

http://www.j-body.org/forums/read.php?f=64&i=155&t=155

http://www.j-body.org/forums/read.php?f=64&i=6694&t=6694

Or for that matter the tuning subforum.

http://www.j-body.org/forums/list.php?f=64

Yes/No/Definately yes.

Im not HPTuning smart. Dont know most of what they are talking about. Especially the 2nd link.

Again, from what I understand, reguardless being the same motor, I was told the sunfire/cavalier computer has a different table than a GA.

I could be wrong, but this is coming from a buddy that works with HPTuners and I dont. So I dont question. I did ask him more than once to make sure I heard clear. Thats why I am asking here. See if anyone did anything different.

spy

05-28-2008, 04:18 AM

I can tell you 100% that the 2001 tables are the same between the jbody and nbody.

Matt95GT

05-28-2008, 09:25 AM

Do what MATT95GT did on his car and copy his fuel setup.

On a 98, I'd definitely choose the HP tuners + fake 2bar option over my method (320 CC injectors + AFMU + S-AFCII + MSD DIS-2 box). I've heard the OBDII PCM's are a little more needy and don't like when you molest the fuel system. When Bobgagt briefly owned that turbo 96 with nearly the same setup, he had a lot of trouble with it.

My buddy with the software has an extra wideband to tune with so yes, that will be included.

Ok... definitely capitalize on that.

CraiGT

05-28-2008, 09:55 AM

Ok now what about the EGR? Its removed but not from the computer.

Is there anything special about removing that from the computer?

spy

05-28-2008, 01:03 PM

Ok now what about the EGR? Its removed but not from the computer.

Is there anything special about removing that from the computer?

In HPTuners there's a table that let's you set EGR to never come on ever again.

CraiGT

05-28-2008, 09:00 PM

Ok so here is what I have so far...

Crate motor
GM supercharger
3800SC injectors
HPTuners + wideband 02 sensor
Fake 2 bar map tune
EGR delete

The whole exhaust is stock. As soon as its drivable it will be going to my local shop for a bigger system. And I will be having my exhaust manifold ported.

How about motor oil? I thought I remember reading to run slightly thicker oil to help the stress of the motor under boost. And its HOT here in AZ. Is this a good idea or no biggie?

loud2kse

05-28-2008, 09:08 PM

dood idea to run at least 10w30 or heavier oil

and there's a shop on like 29th street and greenway with a dyno, or go to chucks speed center down on indian school and 31st ave. both places seem lie good shops, but I haven't ever used their dyno's or their tuners.

CraiGT

05-28-2008, 09:32 PM

10W30 is whats in it now.

Not really interested in dynoing it.

But thanks for telling me. I may go down there one day with the GTP.

loud2kse

05-28-2008, 09:57 PM

sorry... i meant Good idea to run 20w30 lol

and if you're gonna get it tuned properly, you're either gonna have to get it dyno tuned or do a lot of street tuning and trial and error.

CraiGT

05-29-2008, 10:10 AM

Thats what I did with my GTP. A lot of street tuning. Thats the plan.

20W30 dang. Ok I will go with that.

Matt95GT

05-29-2008, 10:12 AM

3800SC injectors

What flow rate?

CraiGT

05-30-2008, 10:00 PM

What flow rate?

36lbs at 43psi. Thats as much as I know about them.

litdevil316

06-06-2008, 04:06 AM

so ya'll recommend 20w30 over the stock 5w30? first i really thought about that. havent put the s/c on yet (still in iraq). its all set up like in the sig lubed with 5w30 RP oil.

CraiGT

08-13-2008, 11:18 AM

Its been a while but the time has come. The car was fully put together and got the HPTune action going on since the thing was running mad rich with the 3800 injectors.

I am not the one tuning with HPTuners so dont ask me any crazy HPT questions lol. But aparently, the car needs to be studied over very well to get the right numbers on the table.

As for now, my tuner got the injector pulse turned down and the car compinsates enough fuel when on WOT for the boost. The scans show no KR, I heard no KR, it is seeing boost, but not at its full potential.

Im going to pick up the car today. Cant wait to wash it up. Thats my late update.

bp's97GAGT

08-13-2008, 08:39 PM

does your computer have the ipw vs. vac table?

CraiGT

08-14-2008, 01:23 AM

Couldnt tell ya. The dude tuning my car didnt tell me but I did mention that to him that those are key things needed I believe. Im sure it does. It was equipped with all 98s wasnt it?

Anyways, here are some pics.

http://i37.tinypic.com/16lwp7b.jpg
http://i36.tinypic.com/15xa69t.jpg
http://i37.tinypic.com/imqzao.jpg

ManktheTank19

08-14-2008, 07:28 AM

Man, I so want to do this to my ride :drool:

Sweet98GA

08-14-2008, 08:11 AM

Man, I so want to do this to my ride :drool:

so here's what you do...

buy my s/c, my motor, my computer, swap to a "96-98"... I can even give you the dash and internals, LOL

You can have it all, but keep your shell :)

LOL

CraiGT

08-14-2008, 09:06 AM

so here's what you do...

buy my s/c, my motor, my computer, swap to a "96-98"... I can even give you the dash and internals, LOL

You can have it all, but keep your shell :)

LOL

Or a stand alone system... but that might be harder LOL.

ManktheTank19

08-14-2008, 09:47 AM

Or a stand alone system... but that might be harder LOL.

Thats what will have to happen if I want the 2.4SC on my 2.3L - hptuners won't work :(

Sweet98GA

08-14-2008, 10:19 AM

Thats what will have to happen if I want the 2.4SC on my 2.3L - hptuners won't work :(

That's just the beginning... talk to Matt95gt bout what he had to do. And on top of stand alone and all the other shinanigans that you have to buy, you still have to mod the shit out of everything to make the charger fit. It sure ain't easy, and prolly not worth it to most

CraiGT

08-16-2008, 02:03 PM

Drove the car home. Does fine while driving, but still has that idle problem of randomly dying. But it tries to stay alive. And it takes a while on start ups. When it does turn over, it acts like its missing for a few seconds then levels out... I dont know if this has to do with the fuel on start up flooding a cylinder or something I dont know.

Moderator edit: No street racing discussion is allowed on the forums

ManktheTank19

08-17-2008, 09:10 PM

That's just the beginning... talk to Matt95gt bout what he had to do. And on top of stand alone and all the other shinanigans that you have to buy, you still have to mod the shit out of everything to make the charger fit. It sure ain't easy, and prolly not worth it to most

Yea, I asked him about it in Albany - he had to do a lot of :shit: and he is still doing some :shit: