Originally Posted by FattyBoomBatty (Post 226149)

dang, can you post a link to this?

Originally Posted by sleepydsm (Post 226344)

clearly because he is better than us all.

Originally Posted by shiv@vishnu

Observations:
-The X runs grossly rich under boost. So rich, in fact, that the engine bogs briefly between shifts at WOT. Really annoying.
-Power output is very sensitive to fueling as soon a AFR leans out from the 10-10.5:1 AFR range it usually runs in at full load. And it stays reasonably sensitive to enleanment even into the 12-12.5:1 AFR range. Something that wasn't the case with the 4G63.
-Engine still makes power in the presence of detonation events (which is not good of course). The 4G63 would behave differently by immediately yanking back several degrees of timing and 20-30lbft of torque. Not sure why the ECU in the X isn't as reactive to knock a the older ECUs. One interesting thing I noticed is that the tachometer movement becomes "sticky" when accelerating during audible knock activity. Haven't seen that before.
-Engine tends to detonation at fuel cut. We had to enrich and retard the last 300rpm prior to fuel cut to prevent this from happening.