Boost and CR
Turbo Mini Forums

Hi guys, how do I work out what boost can be run and a given CR. I know how to calculate the compression ratio but how do I know how much boost that can handle. Obviously higher octane fuel, intercooler and the internals all make a difference to but just as a guide how do I know what I can use

So many factors. Type of fueling, type of igniton, fuel used, cooling, turbo, planned boost..

Edited by Steve220 on 28th Jul, 2019.

There are a lot of variables.

Personally, I have been using 20 psi on 8.6:1 without any real issue. I’ve now dropped to 8.2:1 as I plan on running a bit more.

I’d say that if you have good quality pistons, go lower. Even if you are only planning to run conservative power now, that’ll change very quickly. Choosing a lower CR will future proof it.

In the 13's at last!.. Just