I have been running e85 in my NA engine now for the last 2 months with no issues - I use 1.5oz klotz premix to every gallon of ethanol. The injectors have roughly 20-30% left on them for duty cycle and the fuel pressure drop from 2000rpms to 9000rpms is roughly 3psi. I was able to run a much leaner gasoline scaled A/F of 13.1 which my EGTs ranging from 1350-1450. Iv ran into some electrical issues and I have a new engine harness, crank angle sensor and trigger wheel on its way. Once I have the electrical gremlin fixed I will be heading to the dyno since all the tuning has been done on the street.

Cheers,

Shawn Christenson

Are you still running the omp ?

Yes but that is just due to the fact iv not had time to remove it.

you're on stock injectors and after market pump correct? what size pump are you runing

110% stock!!

any update on the tune on e85?

Been chasing my tail on a electrical issue. I also took this time to finish up some of the upgrades I had sitting in my garage. Car should be up and running by Sunday. Hopefully dyno the following week.

Worth considering if you are running a high % of ethanol :

https://www.rx8club.com/series-i-tec...9/#post4872234

I'm going to run this oil for premix when I go e85

https://cimg1.ibsrv.net/gimg/www.rx8...32a45a07ec.jpg
https://cimg2.ibsrv.net/gimg/www.rx8...da1282d619.jpg

Its what I run! I love the smell and the FD motor I took apart the rotor housings looked mint when I took apart the engine.

For reference . Shows the non-linear relationship between Ethanol % and octane :

https://cimg2.ibsrv.net/gimg/www.rx8...2b2d24dd24.jpg

I was considering running e50, mixing 93 pump (e10) with e85, 1:1 ratio would be easy to measure. And I would only have to bring half as much e85 to the track. That was when I was concern that the stock gas tank would not be large enough for entire race on e85. But I need to detune the car for class, so I don't think that will be an issue angnany

I suspect that much of the gains of going to E85 will be lost by dropping to E50 in an NA aplication .

Got my car switched over to e85 and tuned. Still on stock injectors and fuel pump. I will also be detuning to about 180 whp for the race class. Numbers are also mustang Dyno.

https://cimg4.ibsrv.net/gimg/www.rx8...60bac220bb.jpg
https://cimg7.ibsrv.net/gimg/www.rx8...cd50f3477e.jpg

So dotted line is petrol and solid is E85 at 13afr ?

Yup, around 11.5:1 for 93 pump and 13:1 for e85

That's quite a significant power increase given that it's over the entire rev range !

they dyno runs were about a week apart and the ambient temp were about the same. still running fairly stock timing. will spend more time on dyno over the winter to try to get more mid range power. it definitely takes longer to start the car, and i have a mini battery, so that doesnt help.

Looks like my advise helped out and e85 obviously makes POWER! :)

yes your advice is greatly appreciated.

https://cimg8.ibsrv.net/gimg/www.rx8...37bdcb5a51.jpg
Flex-Fuel Tune Adaptronic Modular Rx8 Plug N Play ECU

wow that looks good. i might look into switching to Adaptronic mid season pending how i do racing on E85. i was able to do one Time trial event towards the end of the season but that's not a really good gauge how it will do in racing.

Having run and tuned both many years ago, a straight gasoline NA Renesis should also be tuned @ 13:1. Running gasoline @ 11.5:1 and ethanol @ 13:1 is not an adequate assessment comparison.

i went back looked at my dyno run logs, Lambda for 93 pump gas was around .87-.89 and for E85 lambda was round .83-.85, that's measured from the oem wideband with Versatuner. the AFR on the dyno chart is from the wideband sniffer clamped on the tail pipe.