All hail the mass flow rate!

Here is a link for those wanting to geek out...good explanations.

http://www.ac.wwu.edu/~vawter/Physic...sFlowRate.html

 

Not just the renesis...EVERY motor.

 

"Could you enlighten us on factual basis of this little tidbit? I have seen older rotaries at well over 300hp so you comment is interesting."


I think Maniac was referring to the OEM fuel delivery system hitting the wall, not that Renesis itself.

 

So what do you think Luis, did we hyjack the **** out of your thread or what? :D :D

 

Uh, well, let's see...

Each rotor has three fuel injectors: (2) 290cc & (1) 380cc
That is 960cc per rotor or 1920cc for the whole motor. BTW - Mazda states in the FSM that there is up to a 15% (!) variation allowed.
Now assuming a BSFC of about .49 (which is probably generous for a rotary motor) and 182.7 lbs/hr (what 1920cc equals) equates to about 373 crank HP.
That is an absolute maximum figure that allows for 100% duty cycle and maximum injector rated output. Run the injectors at the maximum safe range of 85% and you are down to 317 HP at the e-shaft.

Consider yourself enlightened.

 

but doesnt mr. schiavo have a couple of extra renesis engines nearby he can lay his hands on?- if not his team's maybe a "competitor's"? i fit blows up thats one less car to pass at teh next race:D

jeff thanks for that detail

 

Dang. I'm learning ALOT here. Flow rate, psi, cfm, etc. Good stuff. Heck I need some Advil.

Doesn't the Renesis cut timing thanks to it's ecu programming when modding? I know Greddy offers programming with there kit, but wouldn't it be more beneficial to tune the stock ecu? I know the stock ecu hasn't been exactly cracked, but I'm just asking how would the stock ecu be tuned and performed versus a standalone or piggyback when doing FI? What would be the benefits and/or deficiencies of doing one or the other?

Pardon me if this a dumb question, but I'm new to FI. I understand the basics (howthingswork.com babv), but I want to KNOW how it works and how to tune it PROPERLY. Especially when dealing with a rotary.

 

This is a lot of info. I feel a little smarter today! Time for some meds for this head-ache, lol. I feel like I'm back in my Business Law class from last month because there is so much info. Anyway, keep the info coming, I love learning new things!

 

So you are suggesting that when boost is added increasing the capacity of the injectors say with larger injectors would aide in maintaining the ability to maintain air fuel ratios as the boost goes up to increase power to the max potential?

That explains why many have installed larger after market injectors and high performance ignition system when installing forced induction or going performance.

Thanks for the heads up.

 

Yes. I would install 440cc or even 550cc injectors in the primary 2 position. This would give you enough capacity for another 70 to 100 HP at the crank.

 

and with a little remapping by racing beat......

 

...or just a change in the wiring of the E-Manage (two quick snips) and some work to the additional injection MAP.