ECaulk

iTrader: (6)

As long as you don't replace the intake you'll be fine. To get the most out of it you'll need a tune but the GM Stage 1 tune will be fine

umrdyldo

iTrader: (1)

K&N air intake with filter wrap has Long Term fuel trims around 0 with GMS1.

It's the only intake really suggested for stock or GMS1

KMO43

I'm fully bolted w meth and a bigwheel K04 and I broke my ZZP intercooler replaced with a stock one and had 4* of knock and was way slower

When changing anything on the intake track you need to tune the maf trims to match the airflow changes you've created

ECaulk

iTrader: (6)

It keeps temps in check which you know is more than likely the cause of that knock, assuming the IAT2s came down, and we know hotter air means less power, so its kinda a performance gain.

KMO43

My tune is old I ran it in the summer ZZP intercooler no knock. I turned down the boost 2psi and timing down and still had 4* or knock I believe the flow is so terrible that it may have got a lot of extra heat. Let me go check my log to see where my IAT2s are

KMO43

I just checked my IAT2 were at 55* because this happened just a bit ago and it's getting cold here. I added liming and lowered boost and all my knock went away. The stock intercooler just didn't like my 26psi tune. but all my knock was in the mid range through the whole rpm load chart. My meth fixed it up top

ECaulk

iTrader: (6)

How much timing were you throwing at it with 26psi? pre meth injection.

tomj77

iTrader: (2)

wait, op this was the stock intercooler? then is definitely broken.

KMO43

I'll have to double check my log tomorrow but I only added timing up top for meth so I'm guessing stg1 level. But it had the exact same fuel in previous with less timing and less boost than my run with the zzp intercooler

iboost

iTrader: (16)

Yea my thoughts exactly. I've never seen the end tanks on these dent. They have 2 states. Intact or vaporized No middle of the road

KMO43

But also there is no way I can run 26 psi without my meth spraying. It starts between 0 to 5psi

tomj77

iTrader: (2)

Why can't u? I was running 28 with no meth. Or is it cause of smaller turbo more heat

ECaulk

iTrader: (6)

Same question. I sometimes run a 29psi spike tune here (which is like a 26-27 spike) I get zero knock even when my iat2's get close to 100F commanding and observing 12degrees

SECRETARIAT

Any opinions on why this issue of boost and no boost would be so intermittent ? I can go for a 15 minute drive and one moment there's no boost, then some boost and then none again.
Is the computer maybe doing something with opening the waste gate or something ??
Thanks.

xcross

Really man. I had same problem intercooler was hairline cracked. Everybody here has already told you that you have a boost leak. Go find and fix it.

Wert842

iTrader: (3)

Hey dude. You have a boost leak.

umrdyldo

iTrader: (1)

raccoon = boost leak

I've heard it a thousand times.

nathan112i

you have a leak, the turbo is spinning excessively to make the boost you are getting. whats probably happening is your MAF is reading X amount of air come in and your MAP sensor is only seeing a portion of that. basically your turbo is unhappy and your ECU is thinks its drunk.
1.find leak
2.fix leak
3.????
4.profit

SECRETARIAT

Quick question about Boost Leak Test:
Do you have to remove the cold side (passenger) pipe and cap the intercooler on that side or no ?
Thanks.

LNFTX

Hot side pipe coming off turbo to intercooler
https://www.cobaltss.net/forums/how-...ss-lnf-223319/

SECRETARIAT

Ya, got that part, but at the other end do you have to cap the cold side of the intercooler to hold the air pressure so to find the leak ?
I saw a cap mentioned and saw someone said they didn't need to cap it.
Thanks.

iboost

iTrader: (16)

I never capped mine. I just took the hot side off and pressurized the system as it sat.

umrdyldo

iTrader: (1)

No not at all, think about it as a system. You are checking leaks all the way up to the throttle body.

Don't cap anything. The engine can take like 25 psi just as if the turbo was spooling.

So unhook at turbo. Put tester in, pump to 20-24 psi and listen.

ECaulk

iTrader: (6)

I like the soapy water over just listen

iboost

iTrader: (16)

this helped be find I was leaking around my MAF like crazy when I had it in the lower charge pipe.