Compression ratio, HX-40 6 blade

[Mickey6]

So after doing countless searches via google and on different DSM forums, I'm still up in the air for compression ratio for my next engine build.

So far I plan on running 272 Kelford cams, .70ar T3 BEP housing with accompanying manifold, stock intake manifold, DSM link V3, ETS "race" FMIC, and 1150cc injectors with supporting fuel pump and feed/return lines.

Running pump gas (92 octane is all they have in abundance here), and the occasional c/q16 fuel. They do have E85 here but its out of the way and not very practical.

Question being, would a 8.3:1 compression ratio or 9:1 compression ratio be more suitable for the occasional track day and daily driving scenario, especially since the hx-40 seems to be happy above 30psi, and the obvious factor of pump gas?

I suppose I'm looking for input from guys that are or have ran either compression ratio and what they like/dislike about one or the other.

Any insight would be appreciated, thanks. - Mike

 

[OutKastGSX]

In this same situation as well would like to hear some input.

 

[pneumo]

Pump gas + high boost = low comp. I'd use 8.3 comp, otherwise you'll be running with no timing.

 

[zedicus]

im building a 10:1 2.3 stroker and planning on 30psi peak on 91 oct pump gas. should hold enough timing to make 400hp and more torque then that. my main concern is the tranny.