Hey people,
My r33 s2 has the following mods:
pod with box
3" turbo back exhaust
stock turbo @ 10psi
r34 gtt smic
SAFC
I got the car dyno tuned yesterday and it made 176kw. My tuner said it's still running fairly rich. He was unable to lean it out further as it started pinging. He thinks a possible cause for this is there may be oil in the cylinder (perhaps from a piston leak - hopefully that's not the case). Another possibility is that my stock ecu is advancing the timing too much causing it to ping, in which case i need to get a power fc (or a near non-existent sitc). I think the AFR is around 9 (very rich), and the safc shows a correction of only -2 across much of the high throttle (60%) and 0 across the entire low throttle (30%).
the pulley thing at the front of the engine (for manual timing adjustment) is set at "10", (whatever that means). This was set by my previous workshop. Current tuner did not change it, saying it shouldn't be any lower than that (down from 14 standard?).
First of all, can i just get a rough idea if that looks like a correct safc tune? i don't know but i was kind of expecting a little more variation, not just a flat -2 on high and a flat 0 on low. Also, how does the high/low throttle tune work? one set of corrections for above 60% and another set for above 30%? what about below 30? no correction?
secondly, shouldn't all series 2 r33 ecu's be the same? are some known to have more aggressive timing than others?
and finally, is 176 reasonable for my level of mods? i was expecting something closer to 190, but the car is still running very rich, so that sort of explains it.
Also, i *sometimes* feel a bit of a flat spot, which is followed by a slightly weaker pull. This may or may not be related to the above issues. However this is not evident on the dyno graph.
Thanks for your time, guys.