MitsuStyle - View Single Post - Does higher compression ratio raise TQ off boost?

**JET** · 11-16-2012

I haven't personally seen an apples to apples comparrison, but it is a commonly accepted theory and there are many sources on the net about it. Higher compression produces more power at the same boost level across the board, but in a turbo car you actually lose power up top if the rest of your system is capable of running with more boost and is intercooled.

8.5 to 9.5 seems to be the 4g63 sweet spot. If he is running E85 only I could see going higher than that.

11-16-2012	#7
JET Is funding Exxon. Join Date: Oct 2003 Location: Ham Lake Drives: like a bat outta hell! Posts: 7,983	Re: Does higher compression ratio raise TQ off boost? I haven't personally seen an apples to apples comparrison, but it is a commonly accepted theory and there are many sources on the net about it. Higher compression produces more power at the same boost level across the board, but in a turbo car you actually lose power up top if the rest of your system is capable of running with more boost and is intercooled. 8.5 to 9.5 seems to be the 4g63 sweet spot. If he is running E85 only I could see going higher than that. __________________ Is burning corn and stayin' warm! My motorcycle is stock and reliable, my Talon is neither!