Hks Actuator Min 19psi?

[DjeMz]

took my car in for a tune, the lowest i can set the boost was 19psi :S

im running a hks2535.. n im chasing around 16psi...

what would be the best option for internal wastegates? would a stock rb25 wastegate work or will i have to go aftermarket?

id love to go external gate but right now its to expensive for me, student life sucks =(

[abu]

19psi is freaking heaps man, that doesn't sound right

I had a HKS actuator on my HKS2535 and it would run 0.85 which is 12.3psi

Maybe change to an R32 actuator and use a bleeder (turbotech?) but certainly something not right there

[R31 POWER]

Sounds like to much preload on the actuator rod, have you tried adjusting it from there?

[DjeMz]

tried everything, lowest is 19psi.

i have a turbotec lying around, so if a stock wastegate actuator works im happy to tap it.

[limpus]

What dump pipe are you running on the 2535? Had that problem with a generic split dump at forst on my 2535 as the wastegate flap was fouling the dump and not opening properly...another possible cause is a sticky/lazy wastegate spring...and yes...check the obvious by adjusting the wastegate rod...this will allow you to check if the flap is fouling as well...

[DjeMz]

stock dump+front

[joeyjoejoejuniorshabadoo]

+1 dump pipe d00d...

have you ever seen one off a car? there's not much room for a larger than stock internal gate to open... if any at all

[DjeMz]

but i would have thought aftermarket dump = more boost?

[PM-R33]

Definetely dump pipe for sure, change that and then go from there.

[Fry_33]

but i would have thought aftermarket dump = more boost?

It does give you the potential to make more boost as it should be larger and flow better. The wastegate controls boost by bypassing exhaust gases around the turbine. If the wastgate flap fouls on the standard dump pipe it may not open far enough to bypass enough gas. If the gases can't go around the turbine they have to go through and it will just produce more boost.

[W1ngnut]

DjeMz, did you end up sorting this boost issue? I'm running a GT-RS with the same issue but I have a 3" bellmouth dump already. Adjusting the preload didn't help..

[PM-R33]

DjeMz, did you end up sorting this boost issue? I'm running a GT-RS with the same issue but I have a 3" bellmouth dump already. Adjusting the preload didn't help..

When the car got tuned what did the boost pressure graph look like? What power did it make?

EDIT: Just found your thread so ill post in there.

Edited August 7, 2008 by PM-R33

[DjeMz]

rb25

hks2535 - 18psi - running boost off actuator

Standard Internals

Standard AFM

Standard Injectors

GTR fuel pump

apexi n1 cat back exhaust (i know i know, i should really change my dump/front/cat)

arc airbox

237kWs @ 18psi

thats what she made...

[limpus]

but i would have thought aftermarket dump = more boost?

Does the wastegate flap actually open fully with the stock dump...if it doesn't then thats your problem...