SECRETARIAT

Hello,
How far can you go modification wise if your 09 Coballt SS already has the GM1 tune ?
Could you add a Cold Air Intake ??
Could you add a Cold Air Intake and a Charge Pipe ???
Or could you add a Cold Air Intake, a Charge Pipe and a High Flow Cat ????
At what point would the engine start running Too Lean because I believe the GM1 tune will Not adjust for the additional air flow, correct ?????
Thanks for any help,
Jeff

KMO43

The GM stg1 runs quite lean already so adding an intake or any piping intercooler in my opinion isn't a good idea. But an Dp or exhaust are fine. An intake requires a tune to adjust trims

Sl0wbaltSS

I didn't have any problems with a catless dp and an intake on gms1. Ran the same .95-.88 lambda with the mods. STFT is all over the place too.


Also It might be better to get a tune + dp instead of the other stuff. Plus do the vacuum tank delete to save your upper ic pipe and your intercooler.

KMO43

Im sorry but how many engines have you had in ur car?

Sl0wbaltSS

I'm sorry, but how much experience have you had?

KMO43

HAHAHAHA look me up!!!!!

no_ss

iTrader: (2)

Vac tank delete will ruin your engine lol. It's on there to keep stress off the engine it is in no way a performance mod.

no_ss

iTrader: (2)

My BPV solenoid was broken and it wasn't recirculating boost and it was rough.

r1owner

Last year at VIR my intercooler pipe split at the seam so I had to replace it with ZZP piping on the stock intercooler. Are you saying that a GMS1 tune shouldn't be run with this piping in place?

cranemaster

Do full bolt ons including ZFR, swap pcm's

KMO43

Any time you increase the flow it will throw the trims off. I helped a guy with his idle because he had an intercooler on Stg1 and the trims were way off set them and it idled great he said

SECRETARIAT

I had to replace my stock intercooler a while back thanks to a raccoon. I upgraded to ZZP's smaller version. The only other things done are the stock air cleaner air horn mod from this site and ZZP upgraded intake tube.
So are you saying with my GM1 tune that my trims are out due to the intercooler upgrade ?
If not, is the only other upgrade I could do be a high flow catted downpipe ??
Thanks.

KMO43

Yes. Id have to look at the log i have for the exact numbers but prob 7%+ off

SECRETARIAT

So I should either go back to a stock intercooler or with this intercooler would have to go to a different tune ?? I'm making less power with the ZZP intercooler ?

KMO43

I personally saw a nice gain by switching intercoolers and thats why it thows the trims off because of the increased flow. I would watch knock because with bad trims that can happen and eventually get a tune to get those trims dialed

SECRETARIAT

Sorry, newbie here. I've never had any knock. Just want to make sure here, so in my case with my combination I'm likely making less hp & torque now with the aftermarket intercooler than with the stock intercooler ?
Thanks

KMO43

No you'd be making a tiny bit more I'd guess but our car runs off of the wideband o2 so having bad trims could reault in knock then you'll have a power loss without knock you should be ok

SECRETARIAT

So you said earlier that the only other mod that I could get away with would be a high flow catted downpipe. Would this still be the case with the upgraded intercooler or no ? Would I be pushing my luck and likely start losing power or at very least, not gain anything ??

KMO43

A DP is a good mod but a tune will do wonders for the car and be safer. I had a canned tune very similar to the gm stg1 fully bolted and my trims were so bad i had knock so i had to buy meth

CudaJoe

iTrader: (1)

I think my input is probably more beneficial than anyone in here on this particular situation. Changing the charge pipe is fine, changing an Intercooler is fine, It wont change a thing. Airflow is measured at the MAF (intake), air pressure is measured at the MAPs (lower charge pipe, and Intake manifold).

If for some underestimated reason changing the charge pipe (diameter/length) increases or decreases airflow, it will be captured and adjusted via the MAPs.

You will see no change in fuel trims. The intake is the only player in running lean or rich as far as bolt ons go, not including turbo swaps as bolt ons.

CudaJoe

iTrader: (1)

I have yet to see an intercooler produced for the cobalt that has thrown off fuel trims. If you really need to know, I would email ZZP and ask them the question directly. They would have information in their product info section saying a tune is needed with this modification.


The only time a fuel trim has been off after installing an intercooler or a charge pipe is because of a boost leak / bad install.

KMO43

This is incorrect information. If you increase flow the trims will change

KMO43

Ask kzak104 he was gm stg1 with an intercooler and his idle was bad so I fixed his trims and it went back to normal

CudaJoe

iTrader: (1)

dude Ive ran an after market IC and charge piping on the factory tune for 2 years before I ever got a tune and there was 0 change in my trims from OEM and aftermarket IC/charge piping. Charge piping and IC just moves charged air and cools it to ambient. Im speaking from experience here. If you have fuel trim creep, more than likely theres a leak.

To this day I swap between my factory tune and my HPtune. no problem.

KMO43

So you're saying by lowering the resriction in the system is going to flow the same amount of air at the exact same frequency as before??? I have tuned many cars and seen this a lot. Im not sampling 1 car