what I see. Options

[natedogg]

This daily beating by the evo is sickening.

Haha! Better get used to it man.

Marcus is right. If speed is what you're after, lean is what you need. Burn all the fuel every stroke instead of spitting it out the tailpipe or igniting it in the manifold. As long as you have enough fuel pump to get the fuel to the injectors at the proper pressure you're good. Detonation can come from other sources beside a lean condition.

On the other hand, I have no hands on experience with a 190 pump beside what Marcus and I logged, but going by Darryl's experience with his dropping pressure at high RPM's, I'd say if the 190 isn't a problem now, it may be in the near future. Dropping off fuel pressure at high RPM's is something that could kill an engine pretty quickly, so IMO its better to play it safe. As we all know high RPM's is where the engine is working exponentially harder and the available time for an injector to be open decreases rapidly with the increases in RPM's. If you lose fuel pressure especially on a boosted engine the difference between the manifold pressure and the fuel pressure may become low enough to hurt fuel atomization and/or decrease flow out of the injector which can create a sudden nasty lean condition. This is why I would choose a 255. Fuel pressure and injector duty cycle can always be tuned later with an afpr and a SAFC or MAFT, but you got to make sure the flow is there first.