chemicool

iTrader: (1)

Engine rebuilders,

I am getting ready for a rebuild of my 94 FD and I have what may be a stupid question. I realize that most turbo'd cars have lower compression ratios than N/A ones. It seems to make sense to me though that using higher compression rotors in a turbo car would make more power. One should be able to run less boost and get the same power, right? Also, due to higher compression, at idle one would make more power in the lower RPM range before boost comes on. Maybe I am dead wrong? That being said is it possible to run RX8 rotors in a 13b REW? If not what are the highest compression ratio rotors that would be available for this application?

Rx7_Nut13B

iTrader: (1)

To answer your question yes, but you would also need the Stat Gears and E-shaft, because the E-Shaft is ever so smaller than the REW Eshaft

Kim

Higher compression rotors will spool your turbo(s) faster, but because of the higher C/R they wont be able to hold as much Air/Fuel mixture.
Not worth it IYAM.

RETed

WTF?

If you run lower compression ratio, you can turn up the boost.
You would think that everything will be equal, i.e. compression ratio = more boost, but this is not the case.
There was a good thread on this showing experience that lower CR + more boost will always make more power...


-Ted

chemicool

iTrader: (1)

True lower compression, turn up the boost, make more power, but my point is higher compression more power at low rpm before boost comes on and you can make good power with low boost. Low boost means less heat and less strain on turbos. Also one should be able to get very good power from stock turbos or small single meaning better throttle response and less lag. The Mazdasport Turbo RX8 made 362hp and 258 ft/lbs at only 7.5psi. Not bad.

Anyway, just thinking out loud.