93 up north I was able to get 94, but have not found that here yet.

I could live with 2900rpm's of lag....I figured it would be a little more than that. maybe 60-1 will still be ok for me

 

50 trim is bad ass!!! i used one, and i loved it, made boost in reasonable time, the biggest i would ever go is a 60 trim, a 60-1 is useless on a dsm, they suck, they lag 400 rpms more than a 60 trim, and they dont make any more power than the 60 trim...the 50 trim is alot more street friendly, check out garage advances line of pte's, they are nice...and jeff, please stop talkin about 60-1's, they suck remember, for the 1,000,000th time, dsm's can actually maximize a turbo so they dont have to oversize...

 

ya...a 16G can make 300 on a stock 4G63, and thats basically everyone that has one, not just one in a great many....and thats consistently with pump gas, and a 16G is about less than half the size, and by dsm standards can make for a halfway reliable car still

 

damn, you call 2900 lag?? try not making full boost until 6k+ and then youll appreciate the lag at 2900.

 

60-1 takes till about 5k+ to get going on a 4G63, and its basically useless, a 60 trim will make equal power while spooling at around 4000-4500 depending on your setup

 

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)