Wait the higher the BSFC goes up, the lower the HP drops....

Now I am confused.... BSFC refers to loss of engine eff. due to inertial resistance/ heat lost to engine on exhaust/ heat absorbed on intake right?

 

Loss of power due to being over rich.

 

376 HP with a BSFC of .5

 

Yes Charles,

I have been f-ing around and I found BSFC from .35 to .44 on rotaries (via the web, so not real reliable).

 

376 HP





S

 

Have fun man!!!

Yes, so lower BSFC mean more HP. At .44 BSFC we have 422 HP!!!

 

LOL, yes one day we will have it out!!!!!

 

I know, I was just trying to be funny.

 

BSFC = fuel lbs/hr.
On a piston motor, its about .5 and on a rotary motor it is about .6 or so.

 

No. BSFC and VE are independent.
There is no good median VE, especially on an engine with a wide RPM range and power band.
The Renesis goes from 35% to over 100% in its OE form, so its hard to say it is an average or 67%!
BSFC is a fairly constant number since it only applies at WOT and peak torque.

 

You guys want me to do a VE curve as well?

 

This is great stuff here. I'm actually now running into an issue with the MAFS sensor on my turbo install. The ECU is throwing a CEL which is "high voltage MAFS" code. Apparently the MAFS is reporting higher than the 5 volts its supposed to. Is it possible for this MAFS to be overrun at 4-5 psi or lower? Or is it more plausable the MAFS is broken. We had to clean it prior to this because this because the car would not even run. After cleaning it we get this code. Any ideas?

 

Thanks Charles. I don't have the specific code number but my installer pulled it with his scantool and it read as high MAFS voltage. The car also goes into limp mode after a certain RPM (around 4k i believe).

I did some research and most say this MAFS should be good up to around 500 hp, but I also found there was a recall/TSB for the MAFS in 04 rx-8s for premature failure.

 

Replace it...they're cheap....and see if it fixes the problem

 

The MAF should never deliver more than 5v.