Turbo

[chump963]

Im am set that im going to boost my car.

my question is what parts do i need other then all of the turbo parts?

any sensors?
fuel issues?
etc...

And at what psi is it ok to use for a stock setup before changing internals

[matt rupke]

stock internals i wouldnt go above 7psi, and fuel issues if you running low boost maybe some slightly bigger injectors and new fuel rail, your stock fuel pump should be able to keep up with it, but it wouldnt hurt to replace it either.

[VanishingImage]

if not running any tuning software you'll need fuel pressure regulator(to rich or lean out the fuel mixture for tuning) bigger injectors would be must if you want to keep from running lean,might not but wouldn't take the chance. And you'll need a 2 bar map sensor so the PCM can read boost,otherwise you'll peg out at 2psi and run lean which =detonation = blown motor

OR just buy HP Tuners and get bigger injectors and fuel pump and be pretty much done(still might need a 2bar MAP sensor)

[loud2kse]

Vanishing, don't forget that in order for a 2 bar map sensor to work, you'll need to have the computer reflashed to be able to read it. And the only way to do that is to either have a 00-02 and get the dealer to reflash it, or do it with hptuners.

And to the original poster, You will need bigger injectors, and a way to tune the car. the fuel rail does not need to be replaced. Almost all of the highest hp 2.4's still use the stock rail. hptuners is an awesome program to tune your car with.

and no one can tell you for sure how much boost is safe to run on your stock internals. I've seen guys go 12 psi and be fine, and I've seen guys blow their motor on 5. It's more or less all in the tune.

boost is not a small project. My best advice to you would be to research. A lot. And it's also not a cheap project, so my advice to you there would be to save money. A lot. lol

[DontPassTheFence]

GM Supercharger reflash should be good for a small turbo running less than 8 PSI :D

[VanishingImage]

my bad Red,keep forgetting that! But what did Matt use for his 2.3 SC? I don't think he got a reflash....


You'll find a lot of the Cavalier/Sunfire guys getting the GM reflash for their turbo setups

[loud2kse]

I think matt tuned with an afpr and an s-afc. But the s-afc is not really a good idea for our cars, because the map sensor is what that adjusts, and the map sensor mainly controls the timing on our car, and not the fuel like other cars. I could be wrong though, because with the 2.5 reflashed program it's alpha-n tuning, and with the older quads, it's speed density tuning.

but yea, the reflash is good for up to like 10-12 psi. As long as you have enough fuel and a wideband, it'll be decent for up to 14 psi. But it's best to use hptuners along with the reflash.

[Matt95GT]

You have some reading/research to do.

Quick answers:
Tuning... best combo for your year would be HP tuners, a GM 2 bar MAP sensor, and larger injectors. HP tuners would be used to fix the idle to run those larger injectors, retard the timing a tad under boost (to prevent knock) and to setup a "fake 2 bar MAP" tune, which basically allows the PCM to read boost and add fuel accordingly (which it cannot do now).

Also keep in mind that combo will allow you to tune the car, but you still need a way to get feedback from your tuning... wideband O2, dyno, etc. There's some good discussion on fuel mods and tuning here:
http://www.gaownersclub.com/forum/showthread.php?threadid=54472

A upgraded fuel pump may be wise.

There's no exact "safe" number to use for max boost, but healthy 2.4's seem to run years on 7-8 PSI if tuned properly.

Originally posted by DontPassTheFence
GM Supercharger reflash should be good for a small turbo running less than 8 PSI :D

He will not be able to use the GM SC kit reflash on his 98 PCM.


Originally posted by VanishingImage
my bad Red,keep forgetting that! But what did Matt use for his 2.3 SC? I don't think he got a reflash....


AFMU, 320cc injectors, S-AFCII
Correct - no reflash or tuning software available for mine.

Originally posted by loud2kse
I think matt tuned with an afpr and an s-afc. But the s-afc is not really a good idea for our cars, because the map sensor is what that adjusts, and the map sensor mainly controls the timing on our car, and not the fuel like other cars. I could be wrong though, because with the 2.5 reflashed program it's alpha-n tuning, and with the older quads, it's speed density tuning.

but yea, the reflash is good for up to like 10-12 psi. As long as you have enough fuel and a wideband, it'll be decent for up to 14 psi. But it's best to use hptuners along with the reflash.

Not true, on speed-density fuel-managed cars (aka MAF-less) like ours, fuel tables are based directly on MAP readings. (well, and other vital sensor readings like TPS and IAT) I wish MAP was related to timing too... if it was then I wouldn't have a $300+ MSD DIS box on my dining room table being hacked into my ignition system.

Yes the S-AFC has its limits, but works great on my setup. I know the 2.4 PCM is a little less tolerant of piggyback tuning, but in context of the original poster's application, HP tuners is the best solution anyway.

[Sweet98GA]

not to steer you away from this site, but you will find alot of stickied information about boosting your 2.4 at www.j-body.org The cavi's run the same motor / trans we do (for 97 and 98 anyway) so you'll be able to see what people have done

[chump963]

with the 1 bar map it can only read up to 2 psi? if thats true can i use a msd 1 bar map that reads 14 psi at summit? would that work?

[Matt95GT]

Originally posted by chump963
with the 1 bar map it can only read up to 2 psi? if thats true can i use a msd 1 bar map that reads 14 psi at summit? would that work?

No, a 1 bar MAP sensor only reads full vacuum up to atmosphere (aka 0 PSI)

I would prefer the GM 2 bar MAP sensor if I were you. You can use the MSD one if it has the same voltage specs as the GM version.

[Sweet98GA]

and if you really wanna do this, I happen to have a gm 2 bar that i'm not using... i'd have to find out how much it is new, but I won't charge you close to that, and you'd pay shipping

[Matt95GT]

Originally posted by Sweet98GA
and if you really wanna do this, I happen to have a gm 2 bar that i'm not using... i'd have to find out how much it is new, but I won't charge you close to that, and you'd pay shipping

How did you end up with 2? I thought you used the one from your kit.

[matt rupke]

hey gus, if thomas doesnt want that map sensor i would be interested in it

[loud2kse]

gmparts price for the 2bar from the kit is like 142

[chump963]

what is it to get "reflushed"...how much would it be through GM?

[chump963]

how much do you want for the sensor?

[Matt95GT]

Originally posted by chump963
what is it to get "reflushed"...how much would it be through GM?

Never heard that term... well maybe when applied to toilets not cars.

If you mean re-flashed, it cannot be done to your 98... only to 2000-2001 PCMs

[chump963]

so i have to 00-02 pcm? and take to dealer to reflashed?

[Matt95GT]

Originally posted by chump963
so i have to 00-02 pcm? and take to dealer to reflashed?

No, it cannot be swapped. They are far from being compatible. You'll need your existing PCM retuned via HP tuners.