Why won't my car do above 23PSI?
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Joined: Dec 2013
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From: Kenya
Why won't my car do above 23PSI?
My car just will not do above 23 psi no matter what,
I'm running a hallman pro rx mbc, even if i turn it up completely, it still does 23 psi,
boost leak test brought zero leaks, and yes throttle was open while doing the test,
it holds 30psi properly, takes like 10 minutes to go to 29psi
Please help?
I'm running a hallman pro rx mbc, even if i turn it up completely, it still does 23 psi,
boost leak test brought zero leaks, and yes throttle was open while doing the test,
it holds 30psi properly, takes like 10 minutes to go to 29psi
Please help?
Thread Starter
Evolving Member
Joined: Dec 2013
Posts: 281
Likes: 7
From: Kenya
Thread Starter
Evolving Member
Joined: Dec 2013
Posts: 281
Likes: 7
From: Kenya
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Joined: Mar 2013
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From: in a garage
The other common problem with lack of boost is a leak at the exhaust manifold.
They can warp over time, break the stud at the end and then leak.
Or if it's an aftermarket one, they warp AND crack.
Or not enough preload on the WG flapper.
Or the MBC is set up wrong.
They can warp over time, break the stud at the end and then leak.
Or if it's an aftermarket one, they warp AND crack.
Or not enough preload on the WG flapper.
Or the MBC is set up wrong.
Last edited by RightSaid fred; Mar 9, 2018 at 02:16 PM.
take the vacuum hose off the waste gate.
take down the road and see what it will boost.
be very quick to let of the gas if it swings past the 25 mark.
this will tell you if it is the turbo/manifold, or your boost control
take down the road and see what it will boost.
be very quick to let of the gas if it swings past the 25 mark.
this will tell you if it is the turbo/manifold, or your boost control
Thread Starter
Evolving Member
Joined: Dec 2013
Posts: 281
Likes: 7
From: Kenya
alright, I will try do this tonight and post results
Thread Starter
Evolving Member
Joined: Dec 2013
Posts: 281
Likes: 7
From: Kenya
The other common problem with lack of boost is a leak at the exhaust manifold.
They can warp over time, break the stud at the end and then leak.
Or if it's an aftermarket one, they warp AND crack.
Or not enough preload on the WG flapper.
Or the MBC is set up wrong.
They can warp over time, break the stud at the end and then leak.
Or if it's an aftermarket one, they warp AND crack.
Or not enough preload on the WG flapper.
Or the MBC is set up wrong.
if its bad... should be able to hear it.
start it up when its cold and put your hand down around all the turbo and down pipe.
feel for leaks.
careful, it gets hot quick.
start it up when its cold and put your hand down around all the turbo and down pipe.
feel for leaks.
careful, it gets hot quick.