So I should get a 10:1 with pump n meth that would be the best choice from what I read

 

You will choke your turbo out a touch sooner also. Meaning power will taper if you are already near the flow capacity of your hotside.

Boost threshold: the minimum RPM at which the engine is able to produce the engergy required of the compressor to make boost.

Spool: the ability of the turbo to recover and make boost, while the engine is in an RPM range which is sufficient for the process.

A high compression motor will decrease the boost threshold. yay or nay? and explain

A high compression motor will have some effect on spool. explain.

thanks

 

Interesting read

 

Chris
Is your new engine a 150mm rod or 156mm?

 

That shouldn't happen, because increasing SCR doesn't increase VE.


Nay. A higher SCR will improve torque slightly, but torque isn't what spools the turbo.

It does, but the slightly increased thermal efficiency afforded by the higher SCR reduces exhaust gas energy, which tends to slow spool characteristics. This is offset to some degree by the slightly increased torque.