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hks gt2530 vs 40 on rb25

curbsurfer253
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mose Contributor

mose

Posted
Posted

Hey there,

Well, It seems some people have "doubts" :bs!: to my claim of 272rwkw, and would like to see the dyno sheet..

And about the ratings, YES the 2540 is stated at quite a low ps figure, as several members stated above... So As you Can Imagine I was quite suprised :( , I believe a lot of it comes down to tuning skill, you can have 50K of Mods under your bonnet, but unless it is configured properly, you are wasting your time/money

The guy who did the tuning, has built several tough cars (He has a 8sec beast) ,

Enough Yap :) , You got the Dyno Sheet???

I finally got it scanned in :rant: but The limit is quite small, about 100KB (The Original Hir Res pic was almost 300K)..., SO I had to Downsize it and whack the colour down, Its not too pretty, I can E-mail out a High Res one if anybody wants, but this should give you an idea...

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi guys, it does the usual 2540 stuff, no boost to speak of until 3,000 rpm, then everything happens in 600 rpm. This is fairly representative for the large compressor on 2540's. Then they start to drop off (can't hold boost) over 5,000 rpm. This is representative of the small (compared to he compressor) turbine. They have this narrow zone from 3,600 rpm to 5,000 rpm where they work well, anything under that and they feel flat and over that the power drops off because of the exhaust restriction.

But 272 rwkw is a bit more than I have ever seen from a 2540R, HKS rate them at 360 ps plus 10% being for the usual HKS conservative rating = 400 ps or 300 kw. Less the usual 50 rwkw for transmission losses = 250 rwkw. That's about the best I have seen, from a 2540R at 1.3 bar on an RB25 running Optimax. Plus that RB25 was fully tuned, cams, porting, compression, split dump, Apexi FMIC etc.

Is there something missing from your car specs Mose? Like fuel? Compression ratio? Oversize pistons? Cams? Maybe a larger turbine inside the standard cover? I am perplexed as to why this one is a fair bit better than most.

mose Contributor

mose

Posted
Posted

Is there something missing from your car specs Mose? Like fuel? Compression ratio? Oversize pistons? Cams? Maybe a larger turbine inside the standard cover? I am perplexed as to why this one is a fair bit better than most.

As far as I am aware It is tuned on Optimax (He recommends octane booster for High Boost - 18psi) It suprised me as well.. although the dyno chart speaks for itself, you will notice that the turbo is running at its peak, It simply cant push anymore... I was initally concerned with this (ie - Are the extra kw's worth the extra strain, but HKS Turbos are built tough {not indestuctible though} and providing the turbo is allowed to cool down/warm up, it should be okay) Of course If I run high boost constantly, Im asking for trouble.. I rarely hit high boost (I rarely drive the car, as It is for sale and I am keeping the K's down)

SLY33 Mentor

SLY33

Posted
Posted

your power figure does seem extraordinary as mentioned by sydneykid, but you have the dyno sheet: dyno dynamics dyno, and in shootout mode, which im led to believe makes it comparable to any other run done in the same mode.

great result! your turbo must have some special gizzards but :)

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