My friend has a EVO MR with DP, TBE, test pipe, MBC, 272/272 cams. It's running off a Xede. He's been running this setup for about 4-5months now, but recently at WOT at 5000rpms it drops to 0psi. Can anyone help?

 

Everytime I have seen this on my car, it was a preturbo restriction. The DSMs had a rubber spacer at the intake pipe to turbo inlet connection that could move on you during install and block half of the opening. I don't think the EVO has any such spacer, but it may be worth looking into. Check the intake pipe, filter, etc.

 

will try look into that, anyone else seen this problem before?

 

His intake snorkel is not fastened down (bumper to airbox).

Does he not have a cat-back, or did you forget to list it?

 

post this on evo808. someone will be able to help you

 

check your intake hoses. i had that same problem, but my intake hose from my fmic to the throtle always blew off at high rpm. untill i got hard pipes. and you can try that.

 

He does have a catback.

 

Well, that was less important than the first thing I said. Did you go check the intake snorkel?

GVR4 guy, those are not intake hoses - that's the upper intercooler pipe. This is not related to his UICP, and hard pipes are not helpful on the Evo.

 

he solved the problem by getting a aftermarket bov.

 

Um, there's no way an aftermarket BOV solved that "problem."

 

maybe the snorkel intake was loose and he tightned it while installing the bov? Not sure how exactly it went though because i wasn't there for the install. do you happen to know how much boost the stock diverter valve can hold? i'm very curious as to what exactly caused the sudden boost drop at 5000rpm

 

well it did.... so HA!