Jump to content
SAU Community

Recommended Posts

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 =(

Link to comment
https://www.sau.com.au/forums/topic/229008-hks-actuator-min-19psi/
Share on other sites

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...

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.

  • 3 weeks later...
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 by PM-R33
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

dynoula220708.jpg

thats what she made...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I'm normally copping my own abuse from neglecting my daily drivers. "Those suspension bushes will last a bit more", "Don't worry about the oil leak, just keep topping it up". The project cars I'm always doing things slowly on them as I'm wanting them to be done better, and neater, and nicer. Luckily I don't have to deal with 18 year old Matt's "Learning to wire" stuff in the project cars. And there's only one piece of wiring I'm displeased about in the Landcruiser, and it's about to be cut out... However, the box loads of parts that have been going through this place lately for the Landcruiser... Brake pads Brake Rotors Full handbrake overhaul Wheel Bearings Seals Swivel hubs Steering Boxes Half the suspension joints Shocks Air bags (Ones to go in the rear springs for towing) Water pump Timing kit Lower timing case Harmonic Balancer Radiator Lots of other little seals and shits Gas struts for the bonnet New power window switches And god knows what else I've forgotten... Ha ha ha I have my fingers crossed the pinion seals don't start leaking on the diffs, that the transfer case doesn't leak, and the gearbox input shaft doesn't leak, nor the rear main seal. As they're about the only seals I haven't replaced in the driveline! I'm seriously eyeing off buying new caliper rebuild kits front and rear brake calipers... I'll probably recheck all the valve clearances soon too, and hopefully, it should be all good and sweet to haul some long distance trips again!
    • Every time I pull my 3x gauges out of the console and see the crack-addict way that I did the wiring, and I just can't bring myself to tear it all apart and "make it nice", because it is currently working. In fact, the last time I was in there I probably made it worse.
    • The best part is when you own the car long enough that you look back and find your OWN ham fisted amateur shit!
    • The annoying part about neglect, is when you start to replace one thing, and find ten more broken things. Ham fisted monkey repairs you normally only find out about when trying to do something unrelated! Ha ha   Neglect you can kind of anticipate the huge costs to fix it all. Ham fistedness is normally a shock the first time your work on a new old car, as everything "looked" good before.
    • For DBA, check out their guide table here. https://dba.com.au/wp-content/uploads/2023/01/Direct_Replacement-Guide-2021.2.pdf   Additionally they have some other guides and info on how to make sure you choose the right pad.
×
×
  • Create New...