Need help w/ Greddy Type S

[GST2G]

when i shift i get some ch ch ch noise instead of the normal high pitched pshhhhh. and i've never messed with the adjustment when i got it...it was fine till today.
so should i loosen it or tighten it?

 

[cmc]

May be a leak in piping.

 

[larryd]

if its fluttering on boost release i think that means its too loose and you need to tighten it. But mind you on low boost pedaling like 5psi sometimes you will get fluttering. The S Type is a pain as you can really only have it work right under high loads of boost or low loads, not really well on both.

 

[Megaman]

i thought u loosen it if it flutters?

 

[larryd]

i might have it backwards.. its been so long.

 

[95talontsi]

is it fluttering or is that compressor surge

 

[Atari007]

sounds like compressor surge to me too... i would probably loosen it first, if it is still doing it, then tighten it down...

 

[talonted_one]

compressor surge... looses her up

 

[Megaman]

fluttering and compressor surge are the same

 

[GST2G]

one more question...how exactly do i adjust this thing? do i turn the very top part or the thing around it?

 

[larryd]

you loosen the bolt so you can turn the top thing, then you tighten the bolt back down.

 

[jncbmx516]

look on the apex website its www.apexi-usa.com they have the instructions on there!

 

[Megaman]

wtf?!
why would apex have instructions on a GREDDY product?

 

[larryd]

HAHAHA... from www.greddy.com

How do I set the adjustment? The top nipple on the top section will connect to the intake manifold (behind the throttlebody, so it reads both vacuum and pressure. Make sure it does not get bled off to anything) while the lower fitting is a vent for the internal diaphragm. The lower nipple should be left open and not be connected to anything. Make sure when you adjust the stiffness of the valve that you first loosen the lock nut before you adjust the setscrew. Adjustment will very from car to car, so you will need to use trial and error to find a good setting. Generally you want to valve as tight as possible, without getting any compressor surge. (Compressor surge will sound like a stutter.)m You don't want it too loose or it can open too early and you will loose boost. The valve should make one clean blowing sound, it should not stutter. It should also not open before the throttle is shut.

 

[jncbmx516]

yeah larry has it right sorry, go to www.greddy.com they have instructions in there FAQ section!