My 207whp unported N/A E-85 map. (input from experienced tuners appreciated)
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Joined: Jan 2015
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Alright, so I just finished up with my first E-85 rotary tune yesterday.
https://i.imgur.com/mM1vcNY.jpg
I'm super happy with the results.
Upper line is after the dyno.
The lower line is before dyno tuning, but after a bunch of street tuning.
'07 RX8. ~85k miles. Original engine. Original coil packs.
E85. Stock injectors. Walboro GSS242 fuel pump. Stock intake. OEM air filter. SOHN OMP adapter. Redline 40504 alcohol specific 2 stroke oil. Turbo XS header. AP catless midpipe. Borla catback. Rear O2 sensor delete.
For reference, this car made 179whp on the same dyno before all of the mods. Dyno Dynamics units typically read a teensy bit low. The engine was healthy as **** at 80k miles when I first got the car. I'm the second owner. First owner was a psychotic about maintenance.
The full load stuff is dead bang on. I'd add fuel, it would lose a bit of power. Go leaner it would lose a bit of power or stay the same. Same story with adding/subtracting timing.
I had a bit of time to do partial load stuff on the dyno. Not a lot of time though.
I know the part throttle stuff could still be better. I'm sure there is a lot of stuff still in the mapping that could still be better.
Attached is my AP map. Feel free to pick it apart and tell me what I can improve. I was seeing some weird closed -> open loop transition stuff on the dyno. I'm going to have to experiment more with that.
https://i.imgur.com/mM1vcNY.jpg
I'm super happy with the results.
Upper line is after the dyno.
The lower line is before dyno tuning, but after a bunch of street tuning.
'07 RX8. ~85k miles. Original engine. Original coil packs.
E85. Stock injectors. Walboro GSS242 fuel pump. Stock intake. OEM air filter. SOHN OMP adapter. Redline 40504 alcohol specific 2 stroke oil. Turbo XS header. AP catless midpipe. Borla catback. Rear O2 sensor delete.
For reference, this car made 179whp on the same dyno before all of the mods. Dyno Dynamics units typically read a teensy bit low. The engine was healthy as **** at 80k miles when I first got the car. I'm the second owner. First owner was a psychotic about maintenance.
The full load stuff is dead bang on. I'd add fuel, it would lose a bit of power. Go leaner it would lose a bit of power or stay the same. Same story with adding/subtracting timing.
I had a bit of time to do partial load stuff on the dyno. Not a lot of time though.
I know the part throttle stuff could still be better. I'm sure there is a lot of stuff still in the mapping that could still be better.
Attached is my AP map. Feel free to pick it apart and tell me what I can improve. I was seeing some weird closed -> open loop transition stuff on the dyno. I'm going to have to experiment more with that.
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Joined: Apr 2015
Posts: 12
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From: Madison, WI
did I misread something? better power, better cost mpg, and lower engine temps?
e85 is everywhere in my state and costs on average 1.89 vs 3.29. the FRS community is seeing huge potential in N/A e85 tunes. I'm curious to see how it is in a rotary.
e85 is everywhere in my state and costs on average 1.89 vs 3.29. the FRS community is seeing huge potential in N/A e85 tunes. I'm curious to see how it is in a rotary.
Last edited by maadsteez; May 10, 2015 at 11:16 AM.
If you get a half decent Cobb tune from a reputable tuner, you should get all of those on 93. With E85 there is a possibility of corrosion building up on your stock injectors, over a long period.
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Joined: Apr 2015
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From: Madison, WI
Is their a member here who has achieved this? Where does it state their is corrosion? The only real evidence is from the op. Many other vehicles have done e85 tunes with amazing results. Newer vehicles don't have the corrosion/wear that older vehicles have with e85.
The point is that you can achieve the same power on 91 or 93, with E85 you will use more fuel and E85 is not really E85 so you need a tuning solution to account for the various ethanol levels and then you have to worry about corrosion. Bottom line is that it is pointless to run E85 on an NA Rx-8. Do your home work man.
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Joined: Apr 2015
Posts: 12
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From: Madison, WI
The point is that you can achieve the same power on 91 or 93, with E85 you will use more fuel and E85 is not really E85 so you need a tuning solution to account for the various ethanol levels and then you have to worry about corrosion. Bottom line is that it is pointless to run E85 on an NA Rx-8. Do your home work man.
If the op can chime in on reliability/longevity that would help. I just don't see 91/93 octane tune worth it here or many other vehicle boards.
Plenty of people have made in the 215-220WHP range and more on 91-93 octane. No one is arguing the benefits that E85 offers overall, just that running E85 in a NA RX-8 application just doesn't make any sense. You really need to read up.
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Joined: Apr 2015
Posts: 12
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From: Madison, WI
does it still warrant lower engine temps? How much does mpg suffer? were they stock unported engines? I'm still searching for those who have achieved anything close to this and cant find anything?
Search harder, I will give you a hint though, one of the guys commenting in this thread made over 220WHP NA without E85.
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Joined: Apr 2015
Posts: 12
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From: Madison, WI
What do you mean does it warrant lower engine temps? Coolant temps? EGT's? Intake temps? Some were unported stock engines and some are street ported engines, all with various types/brands of mods (and all done on different dynos in different places so think about that). Cars at this power level are street driven and reliable. NA Renesis powered race cars can make 250-260HP+.
Search harder, I will give you a hint though, one of the guys commenting in this thread made over 220WHP NA without E85.
Search harder, I will give you a hint though, one of the guys commenting in this thread made over 220WHP NA without E85.
Not necessarily against E85. It just doesn't make sense to use it when a proper tune can yield the decent gains on 91/93 octane.
If you can find a tuner to tune a Renesis on E85 and get dramatic results. Something along the lines of 250+WHP safely then im sure everyone would be buying into an E85 tune. But there are people here making 200-220WHP on 91/93.
So far we haven't seen anyone here produce serious gains from E85. Not saying it can't be done, we just haven't seen it.
As far as coolant temps, if you download ATR for the Cobb you can edit the stock map to turn on cooling fans at whatever temps you want.
My primary fan trigger temp is set to 195F and secondary is set at 206F. So far I have yet to even see over 198F even pushing it on hot days in stop and go city driving.
Porting a Renesis is basically pointless. How do I know? Ten years of seeing results from engines both ported and non ported. SEARCH.
E85 IS RARELY E85!!!!!!!!! SEARCH.
So unless you are making it yourself, you cannot guarantee the Ethanol content so then you must have a ECU that can adjust based on the ethanol content using a flex fuel adapter. The stock ECU cannot do this and replacing the stock ECU is not really that feasible on a street car. Think about it, you fill up one time and you may get E92, you fill up another and get E86, E78, etc. etc. Get it?
No one is anti E85. I am switching to E85. But I am not NA and won't be using the stock ECU for tuning. Again, E85 on a NA Renesis street car is pointless. And really it would be VERY hard to justify it's use on a Race car.
Last edited by 9krpmrx8; May 12, 2015 at 11:28 PM.
Mobil1 recommends this in a E85 application supposedly. I emailed them for confirmation.
https://mobiloil.com/en/motor-oils/m...o-diesel-truck
https://mobiloil.com/en/motor-oils/m...o-diesel-truck
Last edited by 9krpmrx8; May 19, 2015 at 02:22 PM.
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