Fobra

You guys are talking about static compression, I was referring to final or dynamic compression.

amoosenamedhank

I'm not sure where you're located, but around here E-85 is everywhere. I don't necessarily support the stuff, but it's hard to argue with the octane rating/price ratio it's sporting.

If I ever get around to making this car something, E-85 is definitely going to be in my plans to remove a lot of detonation concerns.

97stanger

i have heard good stuff about E-85 as well. I dont know if I want to go that route though

teej281

Well it requires substantially more fuel though. So for the price, its probably gonna be more expensive than premium but not as much as race gas but will make more power. I'd rather just run meth and every once and a while just have to fill up a small tank rather than everyday filling it up with E85. I used to think E85 was the best thing ever but the fuel requirements are so high that its not worth it to use it when methanol injection will do the same thing and you can just run premium gas for dd. just my thoughts.

amoosenamedhank

Well from what I've seen the fuel consumption is around 18-22% higher. I don't DD my car, so I guess I view it differently. I'd much rather do E-85... if not for the smell alone!

teej281

It smells different??? Ive been looking into it and there is just a lot more to it than its worth. You need to remove aluminum, rubber, and magnesium components out of the fuel system. You need A LOT more fuel than when running 93 pump gas. You need to go to a tuner that knows how to tune E85 fueled cars. It just isnt worth it to run E85. Turbo cars like using it because there is more mass to the exhaust gases so it will spool the turbo quicker, from what ive heard from my Supra buddies that are considering the switch. So for turbos theres that added benefit which might be worth it but i dont think that it would be worth it for a supercharged car when methanol is quite adequate and will give you more detonation resistance than the ethanol will. Just my opinion.

Furinox

I have about a 9.2 compression on my motor and wish I would have gone back to stock compression. Much easier to make 550ish on 10:1 with about 10-12 lbs of boost rather than needing 15 to make that number. Lower timing and with a good tune you don't have to worry about detonation.

I've talked to several centri guys running 700-1000rwhp and they prefer higher compression as well.

teej281

Do you get more torque from running higher compression when using a blower???

97stanger

yeah, i pretty much have my whole build planned out besides what cc piston to go with and the exact fuel setup I want to run...