Need Some Info On Ignition Advance, Rb25det

[isijappanisi]

Hi,

Has anyone got an ignition map which i could compare to mine? got way too low power output on the dynapack today.

My tuner wasn't sure how much ignition the RB25DET could deal with.

So this is my ignition map, got 383RWHP and 390 NM of tourque @ 1.4 bars on a GT3582R

If any one has got a 400++ RWHP ignition map, could you please share it with me?

On PM or in this thread.

Thanks,

Stian

[Guilt-Toy]

Hey

There must be something wrong there. my engine made 400rwhp on 17psi.

Here is my old timing map when my car made 487rwhp.

If your tuner is not sure what timing a rb25det can take then i would be worried if i was you. Every engine takes different timing. Different configurations = different tuning.

That was 24psi with a GT3582r to make 487rwhp.

This tune was back in the day when i used to run huge timing on cruise.

I remember on 17psi or 16 i think it was with 18deg timing it made 406rwhp.. stock cams

[isijappanisi]

Thanks!!

I'm looking for some bugs on the engine as well.. I'm not happy with the result at all.

[Adriano]

Have you eliminated valve float, it seems to be the common problem at this power level with rb25's

[isijappanisi]

Hi,

I don't think valve float is the problem, the curves look ok, but it might be.. Think there is some other restriction somewhere.

Thanks!

[Guilt-Toy]

too early in the power range for valve float....

I think its something simple. check cam timing... what kind of exaust / manifolds are you using ?

what computer is that ? haltach or autronic or something?

anyway post up the setup of your car and we might be able to help track the issue down.

have you tried running the car on the dyno with the exaust dropped just before the cat?

try that

[isijappanisi]

too early in the power range for valve float....

I think its something simple. check cam timing... what kind of exaust / manifolds are you using ?

what computer is that ? haltach or autronic or something?

anyway post up the setup of your car and we might be able to help track the issue down.

have you tried running the car on the dyno with the exaust dropped just before the cat?

try that

Hi,

This is the engine:

· 1.6 mm Greddy Head Gasket

· HKS Timing Belt

· Greddy Plenum

· Splitfire Coils

· Tomei Poncams

· Tial 44 mm Wastegate

· XS power style exhaust manifold

· Garrett GT3582R A/R .82

· FMIC

· Nismo 555cc Injectors

· Walbro 255 l/m in tank fuel pump

· HKS air filter

· 3” elbow/downpipe, with cat replacer.

· 3" Greddy cat back

Running with NGK BCPR7ES spark plugs, 0.9 mm gap.

My computer is GTSlink.

Going to check the cam timing later this day.

Thanks!

[PM-R33]

With that setup definetely, definetely should be making more power then that. Have you got a power graph with AFR's?

[isijappanisi]

Hi, sure do!

[Guilt-Toy]

interesting. check cam timing. check the exaust

[race_snooze]

what fuel are you using??

[PM-R33]

Hmm strange, AFR's seem allright and the power curve doesnt have any abnormal dips. It's almost as if something is holding it back. Are the cams dialed in correctly? Compression on all 6 cylinders fine? That setup should be making around 330-350kw@wheels on 1.4bar with bigger injectors What's the injector duty cycle on the 555's?

Edited May 7, 2008 by PM-R33

[isijappanisi]

Fuel used is 98 octane. My power problem is solved. The cam timing was 1 tooth wrong. I'll see how far the injectors will go, I do know that 450rwhp is possible with 555 injectors.

[Ionos]

I'm making 235rwkw at 1.2 bar (HKS GT2535) and can only run 10 degrees of advance at full power 98 Octane of course. From looking at that timing here others are running 15 degrees or more. What gives?

Edited May 7, 2008 by Ionos