[Turdinator]

Originally Posted by nelsmar

That is a fairly misunderstood comment. The issue is this engine benefits from high octane fuel at high RPM by a fair amount. The power falls off due to fuel stability. With the BPB the falloff is not just fuel stability but now due to a runner length effect. So you still get a good 4-10% power gain at nearly every RPM with E85, you just don't see on the plot a massive WHP gap at redline. The car in this dyno is part of a project I am working on that I will be posting on soon. I have been doing a number of dynos and have been collecting aftermarket parts for an NA project, stick around for dynos of that over the next few weeks. The next parts of the build will include header, op, fp, then intake, BPB removal for comparison comparison, likely an exhaust, and then comparison of 91 vs E85 and possibly ~95 octane fuel (for track days). The last dyno showed the car @ 27%WHP gain @ peak (but with a big falloff at redline). This was on 91 octane.

Originally Posted by loogs

you have contributed so much to this conversation so ill ask you this way because you and a lot of these other guys are much smarter than i am as far as the technical side of this. point blank, is it a waste for me to combine these BPB's with flex fuel? cause at this point for me its one or the other or both. id like to do both. i wont be tracking my car. id like to do as much auto cross as possible and this is my daily driver.

thanks

Think you'll find it is not a waste if you read Nelsmar's post carefully. Basically he is saying that by using E85 and the BPB you will feel more torque in the low and mid range but the top end wont be a whole lot better compared to 93 and the BPBs.