I was reading in the mazda rx7 performance handbook that the 13b has a higher compression rotor than the 13bt



i was wondering if you were to switch the rotor from the 13b to the 13bt if the higher compression with the turbo would give you more power



i was also wondering if that would be a risky thing to do due to maybe ruining the engine by running too high of compression with boost

Higher comp gives you better off boost performance and less lag. But it also gives you less space to mess up in tuning compared to lower comp.

Give you a boost in power but nothing to go crazy about. It did help with the non turbos between the s4 and s5 along with better breathing. The rx8 has the highest compression ratio to date, not mentioned on that book. If that's the book i'm thinking about, it has alot of errors, so becareful with it https://www.nopistons.com/forums/pub...DIR#>/wink.png

the book i have is the mazda rx-7 performance handbook. is that the one you are talking about ?

Why bother messing with NA rotors when you can just turn up the boost?

If you got the money and want to experiment with it, then go for it.

Else, it's a waste of time, because I dunno how much faster you want to go.

A stock turbo'd FC with full exhaust, intake, and fuel support is one pretty quick vehicle. 1st gear is over in a blink; 2nd gear is gone within two blinks.





-Ted

yes, its poorly researched, and sloppily written, put it with your haynes manual...

but i was thinking that you could rin a lower boost and have ever be reliable. do you think that i would be a good idea?

You won't see much gain if any that way. Just keep the engine alone. It'll be more reliable with stock internals especially if you're still using the stock ECU.

Exactly my thoughts.

my new s5 engine has s4 rotors in it. Plans to boost 20-25psi on it, less compression means more room for error when boosting.