HKS 2530 Dyno Results

[Robo's]

Just came off the dyno tuning my R33 with a HKS 2530 with mixed results.

Firstly peak power we got was 220rwkw @ 13.8psi. A good result considering the boost we could run. Now the problems!! (Standard turbo i was getting 207rwkw with exactly the same setup)

1) Running a HKS actuator, we are still loosing a shit load of boost up high. That power run of 13.8 dropped down to 9.2 at 6400rpm where we got max power. I had the bleed valve nearly turned off on this run, so im going to take it off and run no bleed valve just too see if there is a leak.

2) Secondly, we couldnt run anymore boost as we got savage missfires at 4500rpm on every run. So the only way to eliminate the missfires was too reduce boost . I wasnt impressed as earlier i was running near 17psi, and could feel the stronger low down torque before the missfires at 4500rpm. Air Fuel ratios where spot on, so the missfire is not fuel related.

3) Missfires, this is interesting, i gapped new plugs the night before to .66 so it cant be the plugs. Now im only running a SAFC 2 for tuning, so either

a) The standard ECU is giving me too much timing at the 4500rpm mark where max boost is reached? But why doesnt it ping then? I am showing or hearing no detenation at this point. And it doesnt ping up high either.

B) Coil packs, i am thinking i have weak coils and the spark is being blown out by the max boost at this point?

Overall, im sort of happy with the result as the top feels much stronger, but i know with some extra boost there is alot more left in it.

[Busky2k]

You could try upping the preload on the actuator by using washers or redrilling the brackets using Joels method. However im not sure which method will work on your 2530. I thought the HKS actuators were 0.8bar std?

However I dont know how well the 2530 will work above 1 bar on your engine, as its more of a turbo suited to a 2L instead of a 2.5L so it'll be flowing alot more at 1bar on an RB25 vs an SR20 for example. Maybe this might explain the boost drop at higher RPM?

What plugs do you have? 0.66 is a pretty small gap already. Hmmm...

[Lithium]

Good to see you got a power gain What injectors/fuel pump are you running with it?

The missfiring couldn't at all be a coil or something getting on a bit, and only really showing itself now its actually really having to work?

What is your impression on the road of the 2530 vs. stock R33 turbo? Any more lag etc? It looks like the turbo drops off more than the stocker!!!

[Robo's]

I can adjust the preload of the actuator where i want, but still its going to have that midrange peak of boost.

Lithium,

Down low it is virtually eye for eye with the stock turbo, above 5000rpm is where it improves. But, when running 17psi in earlier testing, midrange before 4500rpm was pulling like a train. At 100k in 4th, you could just boot it and it would take off, nice!!

[Robo's]

Good to see you got a power gain   What injectors/fuel pump are you running with it?  

The missfiring couldn't at all be a coil or something getting on a bit, and only really showing itself now its actually really having to work?

What is your impression on the road of the 2530 vs. stock R33 turbo?  Any more lag etc?   It looks like the turbo drops off more than the stocker!!!

No alterations to the fuel system as yet.

[Lithium]

Cool - nice work, my turbo failed a couple of weeks ago and I am pondering whether to replace it with a stock or upgrade - but wasn't totally sure HOW much I'd have to change for an upgrade. Sounds like 2530(ish) sizing wouldn't be too hard on it.

It'll be interesting to see how you go at the drags with the new found power and torque

[SeriesIIGTST]

Good power. I got exactly the same power 220rwkw (295rwhp) at 11.5 psi on my 2535 on my RB25 with both my PFC tune and my S-AFCII tune. Although the PFC tune has a lot better AFR's than my S-AFCII tune. I would think that given the 2535 is slightly bigger, that it would make sense that my power was achieved at 2psi less than yours (not that 2psi is a lot!!)

I'm just waiting on getting bigger injectors before I crank my boost upwards of a bar! :burnout:

Enjoy!

[SLY33]

Robo's, all your problems, ive been there and done that.

Boost will ALWAYS drop off at the top end, giving you a lowish peak power. 2530 is a bit small for top end on a 25. The comp wheels spins out of efficiency.

Id bet its a coil pack causing the misfire. I had exactly the same problem when setting mine up and trying to run more boost. Itd run fine but as soon as you hit boost it just broke down. changed a pack and all was good. 5 months later, another pack went. this time i just wrapped it in electrical tape and its all good. The problem is the coil pack housing gets hairline cracks and arcs out. easy to fix. i can run up to 1.4 bar (still dropping off at top) with no problems. Just check your using good correct plugs, and set at 0.8mm gap. im using iridiums.

The other thing i had to change was the AFM. stock one would max out easily with the increased air flow from the new turbo, giving a coil pack-like missfire, but not as severe.

any questions just let me know, ive spent a lot of time playing with this turbo! I know what you mean about the increased midrange with more boost, mine lights up second easily.

[Robo's]

I dont mind it dropping off boost up top if i can get that extra mid range urge. I felt it and i like it, but i cant live with it missing at 4500rpm. It does it every single time. Even with the stock turbo it would miss at 4500 at 14psi, so we moved it back to 13psi.

What did you do to fix your coil packs? Silicon or Araldite?

Ideally, my spark plug is too small at .66, to me this is only a bandaid fix to eliminate the miss, so i would like at least a 0.8 gap as this is an ideal gap for performance.

[SLY33]

pull out your packs and inspect really carefully, use a magnifying glass maybe, and youll probably find the hairline crack/cracks. I simply wraped insulating electrical tape around the coil pack housing, covering the crack. This will do until i get new coils, its been fine for a couple of months now!

[croat]

Robo's i have had a missfire for ages. Mine went crazy at 4500rpm also. changed coils and there is no prob now. Try find someone with spitfire coils or the like and do a quick swap, i bet it is them!

[Robo's]

Here is the dyno sheet, notice the missfire at 4500rpm

[Robo's]

Oops