MSPEC2 now with 255.6rw kw

[HeathGTST]

G'day all.

I got my car retuned yesterday at ICE performance in Cheltenham, Melbourne, and after 7 runs on the dyno we took her up to 255.6rwkw which is slightly more than last time. The fuel map was clean up a little and reduced the ingnition timing by 1 degree just to counteract some detonation i was getting... With the current tune the car feels alot stronger, especialy off the bottom.

Yesterday was quite warm in melbourne (35degrees) and i had the car tuned at 10:30am just so we could beat the heat. Nigel from Ice told me just to keep and eye on it for the first couple of runs on a cold night just incase the car reacts alot more than expected because of the tuning specs.

Very happy with the result!!

[Robo's]

Sounds like some excelent power, you got a pic of dyno graph?

[GIGOLO]

nice power figure, What boost are you running? what mods do you have?

[Robo's]

Yeah, what boost and are you running a Z32?

[HeathGTST]

im running 1 bar boost

specs as follows

RB25DET (Serviced Every 5000km with Castrol Formula R Synthetic 10W60)

HKS Air Filter

Custom 3" Exhaust Cat-Back

Race Pace 3" High Flow Cat

Just Jap 3" Dump/Front Pipe

HKS GT2535 Turbo

HKS Front Mount Intercooler 600x300x75

RacePace Boost controller 14psi

HKS Actuator

GTR Fuel Pump

and tuned by Race Pace and ICE performance

Nigel from ICE also commented on how nice and tight this engine feels for a stock engine. He was very impressed

[Husky33]

Surely u have some sort of aftermarket management?

Any nice power, exactly what i'm chasing. I've got everything u have except the turbo and boost....so cant wait.

How does the car respond with that turbo...on how many psi? Laggy?

[HeathGTST]

My car runs 1 bar boost which is 14.7 psi

It has a Apexi power FC with hand controller. 2535 turbo isnt too laggy... goes like stink though.. If i drop it back into 3rd gear at 90kmh-100kmh there wouldnt be much on the road that could catch me....

Not that i speed though ;-)

[Husky33]

Also what injectors are u running? Cheers

[R31Nismoid]

When does it actually make 14psi, what RPM?

[HeathGTST]

Just came back from a run in the cold air to see how she would go... I will have to through her back on the dyno... she pulled 72 knock at 5500rpm which it never did before prior to the tune. Nigel said that i should keep an eye on it the first time out because we did tune it in rather warm tempretures so it was to be expected.

[R31 POWER]

When does it actually make 14psi, what RPM?

Yer what Ash said.I'm interested to see how it compares to the same turbs on my RB20DET.It makes 14psi at about 3800rpm in 4th gear

[GIGOLO]

Shouldn't you get less knock with lower temperatures?

Do you have aftermarket injectors?

[Guilt-Toy]

Just came back from a run in the cold air to see how she would go... I will have to through her back on the dyno... she pulled 72 knock at 5500rpm which it never did before prior to the tune. Nigel said that i should keep an eye on it the first time out because we did tune it in rather warm tempretures so it was to be expected.

72 Knock at 5500rpm you say ?? are you sure that it was not a knock from backing off ? those knock sensors are pretty sensitive.. I sometimes get knock that high when i back off the throttle...

Does it do it while accelerating or right when u back off? how many times has it done it ?

What injectors are you running and what fuel regulator and what injector duty are you running ?

You wouldnt have the time to write up 2 excel spread sheets with your ignition and fuel maps? would interesting to compare them with my RB30DET maps

[HeathGTST]

I have standard injectors in my car... they are pretty close to maxxing out... around 95% duty cycle.... It knocked when i was under hard acceleration in 3rd gear..

[ferni]

Shouldn't you get less knock with lower temperatures?

Do you have aftermarket injectors?

Don't think so....

The colder it is, the more dense the oxygen is in the air, which means more oxygen gets pushed into the cylinders with the same amount of fuel...

more oxygen, to same amount of fuel = knock?

[Busky2k]

Yes the colder it is, the more dense it is, but the AFM also measures this increase in density (ie flow) so more fuel is injected to compensate.

The real reason is that hot intake temperatures make the mixture more detonation prone due to the air/fuel mix unable to remain stable and hence brings on detonation.

[BOOSTD]

95% arrgh, install an adjustable fuel pressure reg- up the pressure slightly and bring the duty cycle back under 90%.

5500rpm is where peak torque is made, If you find it knocks more so in 4th and more again in 5th- definately upgrade the fuel system.

Or sell it to me for a good price and i'll do it =)

[Robo's]

95% arrgh, install an adjustable fuel pressure reg- up the pressure slightly and bring the duty cycle back under 90%.  

5500rpm is where peak torque is made, If you find it knocks more so in 4th and more again in 5th- definately upgrade the fuel system.  

Or sell it to me for a good price and i'll do it =)

Its for Sale

[HeathGTST]

Yeah the car is currently for sale at the moment...

[SeriesIIGTST]

Good to see another HKS 2535 equipped RB25 making 250rwkw+. Join the club

It's a great turbo. I have similar mods but was running higher injector duty at lower boost :confused: My bosche 910 pump is supposedly rated higher than the GTR pump in terms of flow, plus i have an adjustable fuel reg so i'm a little perplexed. Good on you though on a great result. Anyone looking for a bloody fast street car, this would be good buying!