SR20DET Boost leak????

[Lewis Maudlin]

OK, here is the story.

 

My car ran fine with the T25 stock turbo.

 

I switched to GT2871R, 740's, Z32. I have all normal mods except cams. The tune is an Enthalpy ROM tune.

 

I had a cheapo mbc and an ebay Freddy type S (Fake Greddy) BOV. My boost would go to about 10 psi, drop back to 8 psi, hold there for a couple of seconds then spool as a function of RPM, only hitting 17psi at close to 7000 rpm.

 

I removed the cheapo mbc and there was no effect.

 

I replaced the ebay Freddy type S with another ebay Freddy type S. Then my car boosted to 7 psi, stalled there for a couple of seconds then spooled as a function of boost.

 

I figured that I have a boost leak.

 

I replaced the Freddy type S with a real HKS SSQV. When I put in the SSQV, I had to change some of the intercooler piping. And, YES, the SSQV is recirculated.

 

Now, my car boost to 5 psi, stalls there then spools as a function of boost.

 

I think I must have a boost leak. Does anyone have any other suggestions or do you think it is a boost leak?

[SR240Z]

make sure all the clamps on the intercooler piping are tight.

 

then double check to see its not the wastegate itself on the gt2871r that isnt functioning correctly. put a air line into the wastegate vacuum port and see if it does open and close freely.

[Lewis Maudlin]

So, do you think my diagnosis is correct? Boost leaking somewhere? I will check the wastegate too.