Totally different application but my 05 mustang made the best power at 23degrees on E85. That was with 27psi of boost via an F1A Procharger. We just made 3 runs at a given timing, let the car get back to a baseline operating temperature, upped the timing another degree and repeated till the power started to fall off and then backed back down to the previous timing. I Regret that I wasn't about to get the stock heads, cams, and intake manifold upgraded before I finished that built. 715rwhp was awesome, but I feel I would have been a little north of 900rwhp if I had done the other upgrades. Car is long gone now, so the Flex and now the F150 are my "performance" fixes for now.
