I'm giving the thought of adding 2 gallons of e85 to 5 gallons of 91 to give it a 95 octane rating. Do I need to retune my car for this? Or would i just be ok? I'm only looking to just be safe as far as knock goes and the summer heat. I have an e85 station right near me and its 3.07 a gallon right now. Or another thought. Mixing e85 with 87 to create 93 since we don't have 93 around here. Just a thought. Any suggestions? Comments?
Car specs:
87 t2 long block.
Taft stage 2 cam
Stock 2 piece intake
Stock exhaust manifold
S60 turbo @17psi
Full 3in exhaust
NPR Intercooler
Custom fuel system
8 gallon cell
110 lift pump
NOS brand 255 inline pump
Accufab regulator
TU fuel rail
And some +40's