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HKS2535 on RB25DET results...round 1

SeriesIIGTST
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SeriesIIGTST Mentor

SeriesIIGTST

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Many people have asked what power i'm getting from my new HKS 2535 which I bought a few months ago so I thought I'd share the results.

Best run = 339RWHP @ 1.12 bar

Consistent = 312RWHP @ 1 bar

Power seems about right for the turbo. However, it wouldn't be my car if it didn't have a problem and in this case, it's a great big dirty hole in my power band which seems my power drop from 280ish back to 200 then shoot back up to peak, all between 5500 and 7000 rpm. It's totally weird.

If anyone has any insights as to how to allivate this hole, please, please tell me. At the moment, we are thinking it may have something to do with the Z32 AFM not talking with my S-AFCII correctly :confused:

Stay tuned for hopefully better results to come.

Cheers!

Sorry, no dyno graph

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https://www.sau.com.au/forums/topic/41032-hks2535-on-rb25det-resultsround-1/
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b0neR Community Regular

b0neR

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Hows response compared to stock, id imagine not too much of a drastic change, it looks like you should be making some good power, and right across the range too.

I'd have to agree with Joel, rather than just running an S-AFC, why not hook up a PFC? It may give you better insight into your problem and would probably make it easier to fix.

SeriesIIGTST Mentor

SeriesIIGTST

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rbs13: Yeah, the maximum of 339HP would equate to 250rwkw :D

Denton33: Stock actuator that came with standard turbo

bOneR: Yeah, response is very similar to stock, only a few rpm higher with good power early on. Unfortuately graph doesn't show RPM but it was at 216hp by 104km/h in 4th. $$ prohibit the PFC at the moment however, that will more than likely be the end case for my car - just a matter of when.

EnricoPalazzo Grand Master

EnricoPalazzo

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Posted

as the safc still retains the stock computer i would believe that it would be pulling shitloads of timing, even thou u r using a z32 afm, which would cause ur huge power dip. Its unfortunate, but the stock ecu still has the final say. I am having the same problems as ur are now.

Like everyone else says, get a full ecu like a pfc.

bbenny Mentor

bbenny

Posted
Posted

Yeah i also have an SAFC II and i have heard so many ppl with problems when changing to a Z32 AFM. that is your problem there. either go back to standard or go PFC. I dont think the SAFC really has the best ability to control a different AFM reading and convert it to the std ECU.

SeriesIIGTST Mentor

SeriesIIGTST

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Enrico - Yeah, i figured as much...bloody stock ECU.

bbeny - I've just re-installed my stock AFM and haven't had a problem with boost cut yet so i'll see how I go when I put it back on the dyno

snake - Glad I could help :P

franks - stock injectors, but upgraded fuel pressure regulator but i'm unsure of the pressure. Clutch is an 9 puck jobbie with 2200lb pressure plate. Xtreme I think it is - same as what Adelaide Clutch Services produce.

rev210 Grand Master

rev210

Posted
Posted

sounds like an ecu based ignition/NVCS issue. The 5000rpm point is where the NVCS knocks off for the day.

Try backing the base timing off 5-8 degrees and try unplugging the NVCS, see if you get the same issue, takes 5min to do in the driveway.

SeriesIIGTST Mentor

SeriesIIGTST

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yeah, it's a bit louder and a bit deeper :rofl: but not noticably, well, until you put the boot into it (and boost!) and then she really wails. However, the noise of the pod and turbo spoolin is loud enough to drain out the noise from inside the cabin at least. My car is VERY quiet though compared to a lot of them.

SLY33 Mentor

SLY33

Posted
Posted
yeh franks, 2530 usually good for 230-240rwkws.

i dont think so, due to the fact that as mentioned a 2530 on an rb25 wont hold boost up top, i have tried every avenue to fix this on mine, 227rwkw was the max we saw with no cat. for over 230rwkw id say youd have to go for the next step up, the 2535.

exhaust housing on 2530 too small for 2.5 litres and spins out of efficiency over 5grand. There has been a lot of talk about a 2530 being good for up to 250rwkw, but this is not so. ideally it is suited to the rb20 where exh gas flow is not so high.

excellent result for the 2535! this is what i should have started out with. 2530 is extremely punchy, but the inability to hold boost makes a flat-feeling top end.

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