To lower boost, do I shorten or lengthen the wastgate actuator arm. It is set at 7psi and I want to go down to 4-5psi until I get a intercooler. I don’t have a boost gage right and I am having problems with detonation.

 

try lengthing it but it might not make a difference.

 

at least get a boost gauge and hook it up. i'm not a fan of adjusting internal wg arms to alter boost but even if u have to you wont be able to tell the difference at that low boost and you wont know where you are.

 

This is what I did on my old set up. It's adjustable so you can shorten/lengthen it till you're happy. One major drawback though, when you lengthen it, it leaves the wastegate open all the time so you have a lot of lag. Yes...I had lag on a t25

 

yeah basically the wg is bypassing so much gas that the turbo doesnt spool at all

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by falconGSR &raquo;</TD></TR><TR><TD CLASS="quote">yeah basically the wg is bypassing so much gas that the turbo doesnt spool at all </TD></TR></TABLE>

Exactly. I didn't build full boost till about 4k.

 

Also if the springin the wastegate is shitty it will be had to biuld ovr a certian amount of boost. Like m sr20 wont hold over 10psi no matter what i do. The boost just drops right off, after initial spike