Ethanol calculator and tuning question

[roachjuice]

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

[wallace]

You could buy the e85 tester from summit to test what the actual mix would be and then adjust your fuel pressure. Ive used 40% to size injectors for e85 with good results...160's are 95's and will idle ok with batch fire injection. Or since you have the 40s in there scale the tune for stock injectors and just run it straight. Good luck post up what you end up doing.

[tryingbe]

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?

Yes, you'll need a retune.

You might be ok, but why risk it?

The main benefit of using E85 is to be able to advance timing and gain horse power.

http://www.turbo-mopar.com/forums/sh...ne-tune-how-to

[c2xejk]

Have you considered an alcohol injection system and straight alcohol?

[roachjuice]

I'll just stick with pump 91