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Hks Gt2835 Pro S Turbo Installed And Tunned!

Turbz RB-25

By Turbz RB-25,
in Engines & Forced Induction

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Turbz RB-25 Experienced

Turbz RB-25

Posted
Posted

Hi Guys,

Finally got the install, tune and dyno done, here it is, I just thought I might share it with ya'll. This figure was achieved at 18PSI. I have no cams, just the usualy supporting mods, ie 555 cc injectors, Z32, front mount, exhaust etc etc.

272.3 RWKW. The Curve does look very jittery up top, not sure why?

post-48356-1207905239_thumb.jpg

Cheers

Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted
fair effort, im half way through putting the same turbo on my rb20, i assume yours is rb25?

was it a remap or you have aftermarket comp? what rear housing do you have?

Yes mine's a RB-25.

I have a Power FC, I and strongly suggest you get one to. A remapp doesn't have any where near as many adjustable parameters as the PowerFC does. That's just my 2 cents worth.

I have the 0.68A/R housing.

I would have gone for something like a GT-RS for an RB-20. Even in my car (RB-25) there is a MASSIVE difference between the stock turbo and this one in terms of spool time. Having now installed it, I strongly suggest you get something smaller.

Cheerio!

"EN4CER" Enthusiast

"EN4CER"

Posted
Posted

Hi,

Could i ask you to tell me when the turbo starts to spool and full boost say in 4th gear? Also does your dyno sheet run out at 6500 or 7000 rpm. so i can work out were the power is to rpm. Cheers

CEF11E Veteran

CEF11E

Posted
Posted

it looks like it is hitting full boost around 4200 rpm. and as soon as it does (115kmph) you are making peak torque and you have ignition breakdown. Are you still using original coils? looks like spark is having issues at 18psi. what size is your plug gap?

also as someone else mentioned it looks like your timing map may be a bit flat around full boost. 18deg would be the sort of timing i would imagine at that sort of boost.

either that or you are having wheel spin, but it looks to erratic to be wheel spin.

cheers :(

nizmo_freek Experienced

nizmo_freek

Posted
Posted

Nice results, does look very "jittery" up top though.

Pretty much the same power as my hks 3037 pro s but i am using 95octane and 17psi.

You must be running 98 yes?

Devils_Advocate21 Mentor

Devils_Advocate21

Posted
Posted

Hmmm 0.68 housing wheel spin for sure on the street looking at the graph part from that you wouldn't have the data for the rest of the graph, ie: IT, AT, Gear, Shoot_6f or Shoot_6. just a query as it clears any inconsistencies and makes the graph true to a point., plus i wouldn't be surprised if the 0.68 would be starting to choke that high.

Cheers

BHDave Grand Master

BHDave

Posted
Posted

The rough curve can be the sample rate of the dyno software. lower sample rate, smoother curve. Maybe spark issues, but that should have been very obvious to the tuner as you can see it, hear it and feel it

Nice curve though, i'd suggest your tuner didn't get on the gas until 3k or so. I have seen enough of these turbos on a dyno to know you should have 18psi in the very low 3k range if the tuner is into it from 2k and the ramp up of the power happens earlier as well obviously.

Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted
The rough curve can be the sample rate of the dyno software. lower sample rate, smoother curve. Maybe spark issues, but that should have been very obvious to the tuner as you can see it, hear it and feel it

Nice curve though, i'd suggest your tuner didn't get on the gas until 3k or so. I have seen enough of these turbos on a dyno to know you should have 18psi in the very low 3k range if the tuner is into it from 2k and the ramp up of the power happens earlier as well obviously.

18 PSI was reached at 95 KM/H. I don't know the conversion of KM/H to PRM. About 3,500 RPM I assume?

Yes I have splitfire coil packs and platinum spark plugs. I'm not too sure what the tunner re-gapped them too, but I do recall that he did regap them.

Not sure about when he put his foot on the pedal?

I think the jittery graph may have been from the wheels spinning, even on the road, when it reaches full boost the wheels are spinning insanely in 2nd.

Do you think I should take the car back to the tunner to resolver the jittery dyno?

And is my turbo spooling up late assuming that he had his foot on the pedal the whole time?

Cheers

Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted

EDIT:

Hi Guys, 18 PSI was reached at 93.4 KM/H.

And sorry, I thought it was 18 PSI that I was running, but it was 17 PSI that I was running when I achieved the 272.3 RWKW.

Boost spiked up to about 20 PSI ( I have a turbo tech boost controller, looking to buy a PFC Boost controller kit to avoid the spike) and gradually dropped down to 17 PSI.

So just to confirm, the 272.3 rwkw was acheived when the boost was at 17 PSI. (Boost remained at 17 PSI from about 156KM/h until the end (180KM/H)

Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted

Hey guys, I had a look at GTS25T dyno, he has the same turbo as mine, no cams, pretty much the same mods, and at about 90km/h, he has about 30 rwkw more then me....

Now, this could be due to the following:

1) The tunner didn't step on it until 3000 rpm, (which I don't think is the case as boost appears to be rising at a more rapid rate all the way) at 89km/h, boost is at 12PSI.

2) the tunner doesn't know what he's doing

3) something is up with my turbo? (I got the 0.68 A/R housing)

DO you guys think I should go back and have a chat with my tunner?

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