just a brief explanation, it seems the bypass valve is leaking after 10 psi. but it ran right for about 5 mins after the new intercooler was installed.

Cobalt SS LNF boost issue - YouTube

 

I would definitely check for boost leaks.

 

i did and that was an issue do to the cracked weld on the old intercooler and then i took everything loose and retightend everything (every silicone boot all the way from the turbo to the intake) checked the map sensors for a leak around them, check the block off for a bov and on top of that im not throwing a code either.....when i had a cracked ic it threw a 101 code

 

I'm surprised you're not throwing a code if you have a leak. I would take out the Bypass valve and see if there's a tear in it. Should be easy to check.

 

yea me and my buddy is gonna take a look tomorrow evening that is a good point tommy it probably is torn.lol. hey I gotta question for you since you have an evo, they have the td04 turbo stock right? basically the same as a k04 but anyways where can i get a block off for the bpv and run my bov again....Believe me ive searched with no luck at all

 

that greddy type rs is a pos mine surged no matter what

 

Check the coupler to the hotside of the intercooler. I found out the hard way if you scrape you'll push the intercooler back making it push the silicone coupler up to the frame seam and cutting it. I did not hear this boost leak.

 

not sure where you can find a block off plate. The Evo X runs the TD04 I believe. The IX that I has runs a ummm.... Not really sure on that one.

 

i seen on an evo site where a guy took out the bpv and flipped the diaphram over and reinstalled. said instead of trying to stay shut its forced shut....would this mean it would still function or does it mean this would block it off and ill check that hotside boot fasterisbetter

 

not really sure never heard of someone doing that.

 

me either man but i think i just found my solution

TD04 Turbo Block Off Plate: Synapse Engineering Outlet

 

I wouldn't be so sure that they're bypass valve (or block off plate) is the same size. I thought I remember somebody bringing this up a month or so ago and the plate was the wrong size.

 

for real? cuz i had a block off for my k04 and it was too small, this one is the same as far as the shape and design but i cant say much for the actual size....think you could find that post?

 

This is the thread I was talking about

https://www.cobaltss.net/forums/2-0l...-turbo-257196/

 

Check to make sure the vac tube that goes to your coldside pipe has not come off at the coldside pipe nipple, right next to the TMAP sensor.


Also, if you install a block off plate, you have to use the diaphragm as a seal, anyway, so it it's torn around the edge. you'll have to buy a new one, anyway.

 

Another question: Does the TD04 perform as well as the K04? I have a TD04 as a spare, in case I blow my K04. When I bought it, I didn't realize that it wasn't a K04, but I'd like to keep it instead of re-selling and buying another K04.

Yet another question: Which IC did you end up going with?

 

i went with the zzp IC and it looks like its well built and is claimed as the biggest ic that fits these cars! as for the td04 in my opinion its spool time and power is identical, that is what time my car has ran right lol

 

You went with the right IC. Best on the market..........period. Keep us posted on progress. We'll try to help out as best we can.

 

Much appreiated

 

So this was the exact issue. The vacuum hose blew off the charge pipe nipple so I got a better clamp and haven't had any issues since! Thanks for the help guys

 

I get a damn cookie. BOOYA!!!

 

What about this one??

Cobalt Turbo Kit, Diverter Valve, Bypass Valve Block Off Plate- TREADSTONE PERFORMANCE

 

Wow man where did you find this? That one looks like it would do the job