bobby1110

it has been a problem from when i put the kit on and got it tuned.

BM83

This may be a dumb question but have you tried to hook up a different boost gauge or changing the source for the gauge? Maybe the gauge isnt reading accurate?

aode08

Definitely check the actual psi with a psi gauge if you have one.


From experience, a tuner can sometimes correct this in the tune, so can having the waste gate ported, or a larger waste gate.


If your boost pressure is not tapering off in the desired rpm, your gonna find yourself in need of a new engine.

Also more exhaust backpressure can help if you have an open exhaust.

Also an External Wastegate will stop this, the internal can be welded shut.


Dont worry, that should end this problem

bobby1110

it is external, and i asked him about the tune and he said that it cant be that that makes it go up. he said it is the waste gate being too small. but every one else has this waste gate that has that kit and has no problem. so i think it is in the tune how about any one else.

bobby1110

this is the first tune my tuner has done on the new mustang.

one eyed willy

the tune wont any effect on the boost level, there nothing to connect them together. your boost is manually controlled from the wastegate. another possibility could be a defect in the wastgate pipe, during manufacturing,maybe when they attached the pipe they didnt cut the hole out big enough to allow the exhaust to escape.

you get some of those pics yet?

bobby1110

i got the kit used and the guy never had this problem but once when he ran just the down pipe. i wonder if is has something to do with the shorter cervinis side exhaust.

one eyed willy

take some pics of the wastegate and the downpipe, your exhaust should not be an issue either unless you are running a 2" downpipe or something. id be taking a real close look at that wastegate area.

one eyed willy

are you sure you have the 5psi spring in there?

Simon1

I had something like this happen after I changed my fuel filter. I have vacuum lines that run where my fuel filter is and when I put the cover back on the fuel filter I pinched a vacuum line which caused my boost controler to go crazy and boost up to 13 psi or so.
To solve I traced every vacuum line from the waste gate to the boost contoler, pulling them back and forth trying to find the line stuck somewhere. I found a pinched line and the issue went away.

Your turbo is mounted differently than mine so i would just physically check every line and make sure there is no pressure on any lines. I would suggest the line that runs to the boost controler to be the culprit, giving it a false signal.