So I've been chasing a few things around and I got a lot of my tuning issues figured out with making sure actual load doesnt exceed requested load, etc.

Sadly though, I think I found the limit of my HPFP with 100% E85. In the log below everything is fine except once the boost gets high up there the HPFP drops down to 500 psi Click here to enlarge. Once it gets that low the ECU seems to pull timing across the board even though everything is great (AFR is fine, STFT's look fine, everything looks great).

What's sad is that at higher RPM the pump can keep up just fine! Its in the 2k-3k RPM range that it appears it just cant keep up... which makes me a sad panda. But then again, this is at 20psi in very cold weather (yay 43 deg F IAT's!)

Am I right in thinking the reason the HPFP cant keep up at lower RPM is because its chain driven from the crank and thus at that RPM it just cant move enough fuel? If so I guess it might be time for port injection, throttle body injection, or a shotgun fuel pump Click here to enlarge.

http://datazap.me/u/shushikiary/requ...olo=19&mark=24