Tuning the RB25DET.......

[USRB25S13]

My PFC should be here in about a week for my RB25. Since these engines are very rare in the US I was wondering what kinda #'s I should tune it to. What's a good traget A/F ratio for the motor and what kinda timing do these motors like? Here is a list of my mods:

The car is a 92 240sx.

96 RB25DET series II.

Walbro fuel pump.

3" turboback exhaust with no cat.

T3/T04E turbo (56 trim compressor/.63 AR exhaust stage V wheel)

I have an FMIC for the car but it isn't on yet.

Right now I am running 9 psi with the stock ECU and it will hit fuel cut on cool nights. I have a wideband on the car now and I see the A/F's going to 10.8:1 under full boost. Base timing is set to stock (15 BTDC).

I was planning on running 12 psi (Should put me around 325-350 WHP) Maybe more to get those HP #'s

So what do these motors like for timing and fuel?

[Steve]

Have a look here: http://www.skylinesaustralia.com/forums/sh...light=power+map

[2rismo]

Were you the guy from the states that emailed me? If so, give me a reply email address that works dude...

Adrian

[kjb_r33]

i have a motec on my r33, had it on the dyno the other day and you would not beleive how badly it ran at 10.8:1. Leaned it out and got most power at around 12.8:1 @ 10lb boost. The difference was staggering, seemed to be drowning it. Fuel economy at that A/F ratio was around 30l per 100 km hahaha.