Looking for some insight as to which way is the better way to make power. Lower compression and raise the boost, or raise compression and lower the boost? Lower compression means you can run more boost with lower temps, raised compression means you run with less boost and higher temps, but the higher compression makes for more HP. I know LS1s get boosted all the time and they have something like 11.5:1 compression.

 

well, what method of FI, what motor, what oct fuel are you using, and wat are your power goals for the car?

These all play a factor. There is no "best route"

 

LS1 has 10.5:1 compression. Also if an LS1 runs boost, they are only running like 6-10 psi. As far as overall power goes, the most power will be had with high compression and high boost. The 1400 hp ecotec runs 53 psi boost, with 10.8:1 compression, but thats running only 1/4 mile at a time with a HUGE air/water intercooler, and methanol fuel. Now when it comes to pump gas, low compression with high boost, wins every time. More boost = more power. Higher compression helps a little, but a 10.5:1 compression motor on 12 psi, will not make as much power as a 9:1 compression motor on 20 psi. However with race gas, that 10.5:1 compression motor will make A LOT more power at 20 psi, but once again, thats using very high octane race gas, while the 9:1 compression motor is still on pump gas. Final Conclusion...

Pump Gas Only = Low Compression / High Boost
Race Gas Only = High Compression / High Boost

 

good job not answering his questions at all blown.

higher compression on the ecotec motors will net better tq numbers. Even on lower boost.

You drop the compression, you are going to lose a lot of torque.

Best bet is to stick with stock compression. If the car "being a ecotec" is going to see the track more often than the street, then no reason you couldn't up the compression a bit.

 

this would be my response when referring specifically to the ecotec. /agree
there were a couple builds using low compression and high boost, but the torque was complete ****. numbers were something like 410whp, 290tq. Stick with stock CR like ralli said, and youll have numbers more like pauls, which are somewhere around 450whp, 420tq