to raise compression or not to raise compression?

[Jungy]

Okay so here I am sitting on a bunch of parts I've gathered over the winter and now I'm debating if I will really benefit from installing these 10.5:1 je's vs the 8.8:1 wiseco's that I have in my motor now. The only reason I am in a debate is because I'm not sure if the cost vs. benefit is really worth it because im gunna have to tear down my block and get it bored .020 over. So what I want to know is what does everyone else think go high comp or keep it as is?

[Super Bleeder!!]

high static CR gets you better response at the expense of boost.

Low CR is vice versa.

Decide what you want, better response or ultimate overall power. No free lunch!

[turbotalon1g]

HIGH COMP!!!!!!!!!!! ^Good answer, I just want to see it, Would be good if you are keeping it a 2L

Do it. It will be fucking sweet. Plus a lot of us want to do it but won't.

[Jungy]

Ohh yeah the head is already getting machine work done because I'm having 1mm o/s ss valves installed, so what I was thinking was that I would have the head milled to have the comp bumped up 0.5:1 making it 9.3:1 with the wiseco's I have now or 11:1 with the je's.

[EclipseGST]

Ohh yeah the head is already getting machine work done because I'm having 1mm o/s ss valves installed, so what I was thinking was that I would have the head milled to have the comp bumped up 0.5:1 making it 9.3:1 with the wiseco's I have now or 11:1 with the je's.

Please dont do this...

[Jungy]

Please expand upon your statement with reasoning. The car is full stand alone via megasquirt and running on e85. I wouldn't think I would lose lose overall power because of the high detonation resistance of e85, I think I would be able to keep my boost pressure up where they are at right now. With the higher cylinder pressure from raising the compression I would be able to make more power assuming there are no issues with knock or detonation at the boost level. I've done reading and volvo's test e85 optimized turbo car runs an 11:1 comp ratio.

[Shane@DBPerformance]

Do you want to run 20psi or 30-35psi?

[Jungy]

Right now I have my spec2 set at 24psi and I would like to run as close to that as I can and still be safe and not risk my motor.

[JET]

One thing to think about, with high compression via static compression it does not get cooled. If you add "compression" via boost, then you run it through the IC and it gets cooled down. So lower compression has more potential for power and be safer on the engine, but the higher compression will have better low end and spool the turbo a little faster.

[Jungy]

That is another thing that has crossed my mind too. I'm curious, would it be beneficial to run my meth kit in conjunction with e85 if i go HC? I've never heard of anyone running e85 and meth injection because of e85 already high octane and its ability to cool your intake charge on its own. I haven't used this alky kit since I installed megasquirt and went e85.