Weird boost issue
08-03-2008, 10:07 PM
#1
1.0 BAR
Thread Starter
Join Date: Jan 2006
Posts: 526
Weird boost issue
Have my CRX LS-T t3-t4 internal wastegate, but i have a weird problem with boost.
In 1st i get around 5psi
2nd around 12psi
3rd around 15psi
4th around 13
5th got 10psi again
Internal wastegate Changed, with same problem, the wastegate flapper opens freely, no problem.
What can cause that?
In 1st i get around 5psi
2nd around 12psi
3rd around 15psi
4th around 13
5th got 10psi again
Internal wastegate Changed, with same problem, the wastegate flapper opens freely, no problem.
What can cause that?
08-05-2008, 04:06 PM
#4
3.0 BAR
Join Date: Oct 2006
Posts: 2,330
Re: Weird boost issue
Originally Posted by vincentek9
at what rpms are you shifting on each gear? maybe its because the internal wastegate hole is small and needs to be ported.
Originally Posted by drupie51013
you should try using an external wastegate. or it might not even be that could be a bad boost controller(if your using one).
Internal gate might have too soft a spring or other issues you cant see. I agree with drupie the boost controller might be having issues as well. Ballandspring boost controllers are subject to this problem when the spring is too weak or the ball isnt seating correctly.
Blowoff/bypass valves can also cause this issue, leaking under certain loads (ie. 1st gear-low load)
08-05-2008, 06:51 PM
#5
1.5 BAR
Join Date: Oct 2005
Posts: 1,276
Re: Weird boost issue
post your complete setup.
what kind of manifold?
what kind of boost controller? manual or ebc?
where it it set to?
what spring are you using in your wastegate?
exhaust? etc
ive seen more problems with finicky electronic boost controllers more than the manual ones. im sure quality varies depending on the type of ebc, but more to go wrong with.
what kind of manifold?
what kind of boost controller? manual or ebc?
where it it set to?
what spring are you using in your wastegate?
exhaust? etc
ive seen more problems with finicky electronic boost controllers more than the manual ones. im sure quality varies depending on the type of ebc, but more to go wrong with.
08-07-2008, 10:51 PM
#6
1.0 BAR
Thread Starter
Join Date: Jan 2006
Posts: 526
Re: Weird boost issue
Originally Posted by drunkinmaster1
post your complete setup.
what kind of manifold?
what kind of boost controller? manual or ebc?
where it it set to?
what spring are you using in your wastegate?
exhaust? etc
ive seen more problems with finicky electronic boost controllers more than the manual ones. im sure quality varies depending on the type of ebc, but more to go wrong with.
what kind of manifold?
what kind of boost controller? manual or ebc?
where it it set to?
what spring are you using in your wastegate?
exhaust? etc
ive seen more problems with finicky electronic boost controllers more than the manual ones. im sure quality varies depending on the type of ebc, but more to go wrong with.
T3/t4 internal wastegate (volvo t3, 8 psi)
cast iron manifold with external wastegate tapped
the flapper from turbo moves freely
dsm blow off
08-08-2008, 09:21 AM
#8
0.0 BAR
Join Date: Jun 2008
Posts: 4
Re: Weird boost issue
The reason you are getting different boost values is because of boost creep. 5psi in first sounds fine to me then the extra pounds in the other gears is because of the creep. Just look at it as free extra power since its gated at 8psi.
That or maybe you have a piece of ---- boost gauge
That or maybe you have a piece of ---- boost gauge
08-08-2008, 10:01 AM
#9
3.0 BAR
Join Date: Jan 2005
Posts: 1,537
Re: Weird boost issue
Originally Posted by jxr1774
The reason you are getting different boost values is because of boost creep. 5psi in first sounds fine to me then the extra pounds in the other gears is because of the creep. Just look at it as free extra power since its gated at 8psi.
That or maybe you have a piece of ---- boost gauge
That or maybe you have a piece of ---- boost gauge
dont look at that as "free" power. try an external gate.
