Attention Greddy Owners and future turbo buyers... An engine will blow up very soon.
#26
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
Here is a link for those wanting to geek out...good explanations.
http://www.ac.wwu.edu/~vawter/Physic...sFlowRate.html
#27
RX8 and a Truk....
Originally Posted by Jon
Since everyone already explained all the important key points I would just like to put in my 2 sense.
Tuning would be a VERY important part of determining the renesis motors potential.
Tuning would be a VERY important part of determining the renesis motors potential.
Not just the renesis...EVERY motor.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#28
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"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.
I think Maniac was referring to the OEM fuel delivery system hitting the wall, not that Renesis itself.
#30
Banned
iTrader: (3)
Originally Posted by Dragonrider
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. ![Roll Eyes (Sarcastic)](https://www.rx8club.com/images/smilies/rolleyes.gif)
![Roll Eyes (Sarcastic)](https://www.rx8club.com/images/smilies/rolleyes.gif)
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.
![](http://www.mazdamaniac.com/images/smiles/twak.gif)
#31
Administrator
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
jeff thanks for that detail
#32
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.
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.
#33
Trolling since 2004
![Talking](https://www.rx8club.com/images/icons/icon10.gif)
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!
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Last edited by 9G Redline; 07-06-2005 at 03:31 PM. Reason: needed to add a few words
#34
![Thumbs up](https://www.rx8club.com/images/icons/icon14.gif)
Originally Posted by MazdaManiac
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.![](http://www.mazdamaniac.com/images/smiles/twak.gif)
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.
![](http://www.mazdamaniac.com/images/smiles/twak.gif)
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.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
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