Acura TSX Forum banner
1 - 7 of 7 Posts

· My car whines...alot
809 Posts
if you're building a block for a supercharged set up, would you run low compression pistons or stock compression ratio?
Depends on what type and size of S/C you're running (Roots vs twin-screw vs centrifugal), but generally it's recommended to stick with stock CR.

As TSimon mentioned, you typically only want to lower CR on high-boost applications where peak output is the goal. However, if this is a DD, keep in mind that lowering your CR negatively affects driveability as off-boost power is decreased.

· Built + Boosted
310 Posts
Your stock cr will be fine.

Boost vs Atmospheric pressure:

Over here in Perth Australia, our average altitude above sea level is 90ft.
With a CR of 10.5:1 and a positive boost pressure of 8psi.
My CR is 15.2:1.

There's a formula for calculating it online too.
The mechanical limits are around the 19-20.0:1 before parts need to be replaced.

+1 for Merc, I have it and it's a damn fine product.
1 - 7 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.