Running a AEM 50-1200 pump in the canister with the feed pickup through the bottom. Full tank of E85 at time of dyno. They measured fuel pump PSI and wideband O2 throughout the runs. They set the shift rpm at 6150. It pulls hard all the way to shift point. Makes you want to up the shift rpm but he stated it looked like I was starting to get valve float above that so that is what he set it at. He recommended I replace the valve springs or upgrade to 105s so I could up my shift RPM several hundred. I am running blue 90's. I didn't do the dyno run/tune so I don't know the specifics of how to tell boost induced valve float. I am just relaying what he told me and I have no reason to doubt him. I bought the springs used so I don't know how many miles are on them. I don't plan on swapping springs just to get a couple hundred more shift rpm. It's a DD not a race car.
Still need to dial in pulley size.
When is the greatest weather condition chance to get knock on E85? Cold weather, running higher psi, with E70 or whatever lower blend is in the pumps now? (Ohio winter) If I tune for pulley/timing/KR now will I be fine in the summer heat on E85 with the higher octane? Trying to figure out if I tune with lower octane E85 blend fuel in cold weather will I have more or less chance of KR in summer heat on E85 (higher octane blend)?
