S-AFC tune today.

[JimX]

I got my car tuned at Hills Motorsports today, and the result was pretty good. The best run was 214rwkw @15psi. It was breaking traction by the second or third run, and after that I had to start sitting in the boot!

Then the next run it was still breaking traction so he got one of those straps out to hold it on the rollers (with me in the boot again). If anyone's considering removing their tow hooks for a neater appearance, then consider that you may not be able to get accurate dyno readings once you start upping the power

Mark said that he's never seen an R33 GTS-t break 220rwkw on his dyno with the stock fuel setup, so I don't think I'm doing too badly. He suggested a SARD fuel regulator to help with the top-end leaning out (the 044 pump on its own is not enough), but at around $300 for that I'm thinking I might look at bigger injectors instead.

The car went in with 184rwkw at the old tuning settings, so I can definitely tell the difference. The biggest increase is in the midrange, with the top tailing off because of waste gate creep. That's probably something I want to fix up before the injectors, the power delivery is now more wobbly than before.

[T0nyGTSt]

214rwkW is a fine fine achievement.

I would be happy with that. Just a few dollars more spent on it will yield a bit more.

If you want the best, do Nismo 555cc injectors.

Your choice of regulator but it's NOT necessary with a 044 and the big injectors. But at $200 or so for a Nismo or Apex, HKS reg. -may be worth it for insurance.

T.

[JimX]

At the moment I'm not chasing more power, but wanting to smooth out that upper range. I can't believe that huge power/torque spike at around 4500rpm, I can definitely feel the difference on the road. I would even be willing to sacrifice some power at around that range to get rid of the dip at around 6000.

I think I need a new wastegate in the medium term, and injectors/regulator in the long term. For now I'll just live with the temperamental power curve up top.

[hippy]

hmmm another good 95 line

[hippy]

jimx please outline ur mods

[Craved]

Jimx

what mods are you running to make this power output?

[JimX]

It's all pretty ordinary:

Front-mount intercooler made by Mick's Metalcraft in Sydney

3.5" exhaust (dump pipe slightly narrower to match the turbo outlet size but expands out to 3.5" at the front pipe and back)

Home-made front-facing plenum (which I think helps the throttle response but not the power)

Garrett T04E turbo (flows up to 450hp)

Bosch 044 fuel pump

Boost controlled with a GReddy Profec-B EBC (the older type with only 1 dial).

The bit on the dyno printout where it peaked at 92kph was where the maximum power was at about 130kph when I first got the car. Back then it had a smaller fmic with really bad piping, which was the biggest restriction. I think that replacing this got me my biggest power gains.

The Hills dyno is pretty conservative too. As I already mentioned Mark told me that all R33 GTS-t's he's seen on his dyno will max out before 220rwkw with the stock fuel system, but I've seen a few people around cracking 220 on other dynos with the factory fuel.

[Steve]

Nice result JimX - plenty of smiles when the foot goes down I guess:)

If you are worried about fuel pressure, as Tony suggested, a fuel pressure regulator could be the go unless you intend going over 250rwkw. Injectors will cost about 900-1000, fuel pressure reg can be had for under 200 - eg, nismo adjustable from www.greenline.jp . (I think they were about 157aud plus postage last time I checked and the dollar was buying about 78yen)

I personally like the nismo one as it looks like a stocker just has an adjustment screw on the top, so no frigging around fitting it