R34 Woes

[toby19]

Hey Guys,

I need your help...

In Jan of this year, I had my stock R34 (auto) dynoed. Output was 134 kw at the wheels. Seemed pretty standard. Today I had it dynoed again to find out what gains have been achieved after the following mods:

HKS dump pipe ($576)

HKS front pipe ($300+)

High Flow Cat ($200+)

3.5 HKS Cat Back ($900 second hand)

K&N panel filter ($126)

Turbosmart Dual Stage Boost Controller ($270+)

The result...nil gains at all.

We were trying to come up with the optimum boost setting. The stock boost reading on the dyno indicated between approx 6.9 to 7.2 psi. Air fuel mixture read 10.0. When the boost was increased to 8 psi, power suddenly dropped to less than 100 kw. I've spent close to $2,500 so far.

Could someone please point me in the right direction. What could have gone wrong?

[R34GTT-R]

Ecu is retarding the shit out of it.R34 ecu apparently really sensitive and dont like boost increase as much as previous models.i would start saving for PFC.

[JimX]

Yes, it's definitely fuel cut. Also the mixture is pretty bad to start with at 10:1, it should be at least into the 11's. The mods you have done aren't in vain though (although your exhaust system was a little expensive), once you get the boost and fuel cut sorted out you will get an extra 50kw on those figures easy.

[franks]

try resetting the ecu overnight. the next morning start her up and give the car a thrashing of a life time...your ecu might've picked up some bad habits...

[rs73]

He said his car is automatic. PowerFC doesn't work with Automatic cars. So far Apexi only made one version for the auto, which is for the Supra only, due to many TT Supra in Japan are autos.

If you want PowerFC, get your R34 converted to a manual, or sell it and buy a manual R34. Alternatively Buddy Club released a piggy back computer for auto cars, but dunno who can tune it here in Australia.

Originally posted by R34GTT-R

Ecu is retarding the shit out of it.R34 ecu apparently really sensitive and dont like boost increase as much as previous models.i would start saving for PFC.

[T0nyGTSt]

Why not E-Manage then?

T.

[rs73]

Dunno abt e-manage, but there was another thread discussing abt e-manage side effect of melting the coil pack in automatic Nissan cars. Didn't happen with Toyota cars, so apparently owning an automatic Nissan performance car could b a real pain if u want to modify it to a certain level...

Do a search on e-manage in this forum... cheers.

[T0nyGTSt]

Originally posted by rs73

...side effect of melting the coil pack in Nissan cars...

You've described the behaviour of Nissan performance cars in general...

T.

[rs73]

Nothing wrong with nissan perf cars, I own one! I think more like incompatibilty between e-manage and auto cars. As I said do a search on e-manage, not 100% sure if that was the issue with e-manage+automatic nissan.

[rs73]

forget it. here's a free shortcut:

http://www.skylinesaustralia.com/forums/sh...ghlight=emanage

[toby19]

Thanks all,

One stupid question though as I am not really automotive literate...how do you exactly reset the ecu?

[Steve]

Disconnect the battery, when the light in your boot is out, the ecu should be reset - worked in my R33.