Jump to content
SAU Community

Recommended Posts

I'm after anyone running a HKS GT-RS on an RB25DET, (genuine HKS kit, not a Garret equivalent) to post up their dyno graphs.

Specifically their boost graphs.

I'm running one on my car and have been for some time, but only recently 'finished' the package off with injectors and a Z32 AFM...

It made 253rwkw on 18psi, but boost isn't holding in the top end, which is why I'm after other's GT-RS graphs, as well as any similar experience with boost not holding, and how you overcame it if you did...

My car has all the supporting mods, with most mods being Jap brands and not cheap chinese copies.

Thanks in advance :)

Link to comment
https://www.sau.com.au/forums/topic/261410-hks-gt-rs/
Share on other sites

do you have an electronic boost controller? Honestly every dyno graph I've seen I always seem to see the boost pressure starting to drop off at the top end mine included. My tuner said that it's very common for skylines. I'm sure someone will disagree and probably has more useful advice.

How much is the boost dropping off and how quickly ? Post up your dyno graph if you have it handy

Link to comment
https://www.sau.com.au/forums/topic/261410-hks-gt-rs/#findComment-4481180
Share on other sites

I am interested in this as mine is also dropping off albeit on GTSS on a 26, but the same question ponders, I am going to replace the EVC6 to see if it is defective failing which I will wind up the HKS actuators to set them at 14 psi (currently at 11) so the evc only has to hold 4 psi above the actuator pressure rather than 7.

I hit and about 18ish for say 1,000 rpm and then as with the above, it tapers off a couple of psi down to low 16's.

Link to comment
https://www.sau.com.au/forums/topic/261410-hks-gt-rs/#findComment-4481941
Share on other sites

I have the same problem as well, it peaks at like 19psi then falls to like 17psi, no matter how much I stuff around with the duty cycle settings.

I thought my BOV was leaky, so I put a rubber sheet between the stock BOV & the cross over pipe, no difference. I thought it was the actuator, but after seeing dyno graphs, it seems to be the norm.

Link to comment
https://www.sau.com.au/forums/topic/261410-hks-gt-rs/#findComment-4482166
Share on other sites

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


  • Latest Posts

    • I was just driving into work and while on my drive, I went to accelerate and noticed the car would sputter/hesitate and I’d hear a few pops from the exhaust before it started going faster. Then I also noticed that when I push my clutch in, the car would die. This all started happening today. Any ideas?
    • That is a lovely Volvo, just saying. Yes I should have got an 260RS when they were cheap. I do regret now.
    • ^ lots of good points made above. The thing is, "aggressive" or "flush" fitment is relative depending on how much you have been influenced by social media. My starting point is always "look at the Nismo RWD specs". That is where you should start, then start measuring as GTSBoy as sort of mentioned, because every car will be slightly different. My 8.5"+35/9.5+38 will not be "flush" enough for you because you want more "pumped" look, which is why you measure. Tyre sizes and brand/models also make a difference. Some tyres are more chunky/square, some are more rounded. That means you could get away with more aggressive offsets without rubbing. But then it also depends on your ride height. Also depends on how much your car copped damage before being shipped from Japan. So it goes back to measuring your car yourself and determining what can work. Those Nismo specs are used bacause it's a safe spec for standard car (suspension. body) with chunky tyres. But then I put 265/35 wide tyres on R34 GT-R wheels, and currently run 285/30 tyres on 18x10 wheels.
    • Sounds pretty awesome. I recommend creating a new build thread and posting all your goodness in there.
×
×
  • Create New...