higher static CR has its benefits, but there are a few drawbacks to it. those drawbacks were already mentioned above by TurboJZ. It inreases your dynamic compression ratio and also makes a higher risk of Knock/detonation... but so does a shit load of boost on a LOW compression ratio motor sow hats the difference?

the difference is on a motor w/ a higher CR, you have better off-boost driveability due to increase torque created by the motor while operating under vaccum. stock 1G pistons are 7.8:1 and are doggy dogg when off boost, but you can run more boost... in fact, youd HAVE to run more boost ot keep up w/ an similar engine where the only difference is compression ratio. more boost is not always a good thing, especially when the turbo starts to operate outside of its efficiency range and begins to blow hot air... like a T25... youre just blowing hot air after 13 psi, so why bother?

Benefits of higher CR:

Increased exhaust gas energy
-Quicker spoolup
-more force applied to turbine which makes transient response better
Increased off-boost cylinder pressure (more power off-boost)
Dont need as much boost to make same amount of power
Make MORE power for same amount of boost as before.

Downside of higher CR:
Higher dynamic cylinder pressures which can cause more Knock
.. but thats it. if you know how to tune out knock, then you dont have a problem. the knock occurs cuz of extra heat which can lead to the knock problems, thats why you need higher octane or tune more fuel into it ot cool down the EGT's.

60-1 is ridiculous. there are some flaws w/ that compressor. it must be stupidly inefficient, cuz i have yet to see a published compressor map for a 60-1 w/ efficieny numbers on the islands. 50trim on a DSM is Pump Gas king, thats all i got to say.

all you have to do is pick a compressor that flows good amounts of air w/o requiring sky-high pressure ratios... like the 60-1 doesnt even START to rock till at least 14 psi.... where as 14 psi on the 14 is already smokin it up. if you match your turbo to your engine and CR, you wont have a problem. most people dont know what they are doing, and they just pick something that sounds like a good deal, or that they think is a cool turbo or they want the biggest and baddest thing out there but dont have the proper shit to support the turbo.

btw, You can see our mods that Flubyux2 posted in the other thread about DSM's that Poppasmurf started. the boost threshold on this motor is 1700rpm, and full boost is like 2700-2900rpm (14psi). Just free revving the motor, itll hit 20psi before the tach hits the redline. the car gets up and goes like its got a supercharger on it cuz the boost hits so fast... and tahts what 8.5:1 compression does for you w/ a 14b and a ported 6cm exhaust housing. i personally would not recommend more than 9.0:1 on a forced induction application destined for street use.

thats all i have to say about that...

Flubyux2 (kelly didnt log out)