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Fiesta st boost

ConnorFist18

ConnorFist18

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#1
Hello st owners usually I get 18-20 psi on boost, I changed my cold air intake back to stock to get through emissions went back to aftermarket, I’m only seeing numbers of 14.89 at the moment any ideas ?
 


dhminer

dhminer

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Intake is all pre-boost so shouldn’t have any impact unless you’re running a massive turbo at 18-20 psi. Bad gas? What’s your OAR and timing showing?
 


Dialcaliper

Dialcaliper

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ConnorFist18 said:
Hello st owners usually I get 18-20 psi on boost, I changed my cold air intake back to stock to get through emissions went back to aftermarket, I’m only seeing numbers of 14.89 at the moment any ideas ?
Click to expand...
Did you hook up the EVAP harness up correctly when swapping the intake back or mess with the symposer connection? If either connection to the cold side pipe is leaking or disconnected, you may have a boost leak.
 


dhminer

dhminer

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Dialcaliper said:
Did you hook up the EVAP harness up correctly when swapping the intake back or mess with the symposer connection? If either connection to the cold side pipe is leaking or disconnected, you may have a boost leak.
Click to expand...
Symposer could definitely do it if he messed with that. Would the evap harness cause low boost though? I thought our cars don’t really care about pre-turbo leaks but not entirely sure
 


OP
ConnorFist18

ConnorFist18

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Thread Starter #5
dhminer said:
Symposer could definitely do it if he messed with that. Would the evap harness cause low boost though? I thought our cars don’t really care about pre-turbo leaks but not entirely sure
Click to expand...
I haven’t touched anything recently other then the evap line which has like 4 connections so pretty simple, I thought. I had a lot of soot coming into the engine bay maybe it got into the turbo potentially causing a problem with the turbo friction, rotation. But currently I get to around 14.8… psi usually I am 20 plus. Idk if it could have been super low oil idk I’ve been looking all over boots look fine, boost lines are good from what I seen.
 


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