We have 10% ethanol in our 94 (Canada). I use a drum of e98r from fuse racing fuels. E85 can be all over the place from the pump, you’d need to test it for E content.

the cars ecu can adapt in terms of timing and lambda, even if the e is off a bit, but that also depends on your tuning.

 

I bought one of those kits for testing. This is a great local Facebook page with consistent updates and posts regarding E content across town. Luckily there are several stations across town selling high content Ethanol fuels. A couple of the stations are owned by the same person and even the owners who sell the E85 are aware and involved in the performance aspect of the fuel. Good news for supply.


https://m.facebook.com/groups/557083027967596/

 

I miss the Sunoco 94 octane on pump when I lived in Canada. What's the cost per litre nowadays?

I'm pretty sure regular gas is up to 15% ethanol in my side of the country.

 

Today's the day.. Experimenting with an E85 tune.

My neighborhood station has E98 on pump. Sheesh!

 

Subbed..

 

So.. On my 93/94ish octane tune it put down 682whp. Gonna call that one a glory run because it was early on and the first pull of the day, IAT's were in the 40's

On E85 ( had to dilute the E98 with 91), it made anywhere from 619-670whp. We toned it down and kept it on the 619whp map as that one fully functioned, IAT's were in the 100's for that pull and the other E85 pulls.. The stock high pressure fuel pump takes a dump on all the maps above the 619whp. E85 is just too much. However, we discussed trying E54 and/or E40 maps. The tuner is confident that on E54 or E40 the car can easily put down 700whp. So all in all, the current 619whp map could be in fact making much more power with lower temps since it was heat soaking on the dyno.

On the tries where the car did 650-670whp on E85, the car was on the path of making a boat load of power.. 730whp+, but again the high pressure fuel pump maxed out. Very impressive for just bolt ons. There is a ton of room right now on the top end on stock turbo.

I now have an E85 map and E54 map on my Cobb Accessport which is cool. We will continue the journey via remote tuning on the E54 fuel. At the moment I think I am the first and only person out there with Ethanol Maps for a 991.2 TTS via Cobb AP.

The car is running super smooth on the V1 E85 map. Much smoother and linear than my pump gas 93/94 tune which was just a spinning torque monster ( a little rough and inconsistent too). The motor was being pushed.

Once I'm done having fun with this E85 map and I get on empty, I'll be dialing it lower Ethanol maps. Overall an awesome experience. The positives are that Ethanol is just much more safer, burns cooler, and cleans the motor. Big plus!

Video:

 

With that said.. Somebody please make a high pressure fuel pump upgrade for the 991.2 TTS.

$3.99 a gallon plus being next door to my house beats $8-$10 a gallon for 100 octane plus a journey.

 

Excellent test. Thanks for posting ! Confirms the pumping system is not up to the task at all.

Will be interesting to see if you can consistently better the pump 93 tune with E40. Tight balance between enough fuel to make +680 on E10 vs E40 and still not max out the pump.

Do they always remove the fascia to dyno ?

 

I had offered to do so in case any hoses or vacuum lines popped and they agreed. Not necessary to do so.

I'm going to try E54 first as I can find that on pump, and if that's too much I'll be diluting E98 with 91 to get E40 and sew where that takes me.

Before all that I'm going to some dragy pulls on the mild E85 tune.

The 682whp number on 93/94 (with pure 100 in the tank) is a very strong number.

 

Maybe I don't understand E85 or any of the E numbers in terms of how it affects our cars.

Also, it seems like a PITA to get right with the mix / proper numbers.

I was told in my info in my tune upgrade paperwork that I could use some E85 to mix with 93 and be able to run my 100 oct. tune. Should I do this?

I thought E85 was corrosive and / or bad for our fuel systems??

I'd love to run my 100 oct. tune more frequently at the WAY less cost of E85 at the pump. I just don't want to do ANYTHING to hurt the car.

 

Here is my 2 cents. Very cheap and probably worthless advice….

On a 100 tune run 100 fuel. Period. Very good and safe. A pain , but safe.

On a 93 tune, 2 gallons of E85 in a full tank will not hurt anything, might add , might not, 1-2 degrees of clean up timing in hot weather.

Want to run E85 , get a flex fuel sensor , upgraded fuel system, etc. etc. or feel the pain of blending.

93 tunes are a lot of fun for me. No blend, no worries.

If you have to have more I would install a proper Meth kit from @SamboTT@ByDesign along with his tune. Would do that any day over blending, measuring, testing fuel for less gains than a simple meth kit would give you.

But I am lazy.

I also am happy with my plain old 93 tune.

Everyone has a different when to say when. Mine is a @SamboTT@ByDesign 93 pump gas tune.

Good luck !

 

Ethanol can be corrosive in older cars and 2 cycle motors, nothing to worry about in modern vehicles. Ethanol is in fact better than standard gasoline in many ways aside from large consumption. E85 on our cars can't be fully utilized and all it will do is tax the fuel system. I'm best off lowering the Ethanol content and re-tuning.

Splashing some E85 or E54 (or whatever you have on pump) will always assist and benefit your fuel... Keyword: Splash, not fill. I asked the tuner if this was OK to do on 91 or 93 maps and he said definitely. Especially out here in the southwest where we probably have the worst gas on planet earth.

Mixing Ethanol is no different or harder than standard gas once you've figured out what the E content is out of the pump. The tester kit I used was rather fun IMO, but I can see it being a pain if I'm in a hurry. If you look closely at that test tube photo I posted, you can see a very small tiny layer of water at the top.

On pump I get E98 (98% ethanol) and 91 octane (10% ethanol) 93 is also 10% and even better than 91 but we don't have that here. You can find an online calculator and plug in numbers to find out the ratio.

For example, I want an E40 blend.. For 10 gallons, I need to mix:

3.41 gallons of E98 and 6.59 gallons of 91 (E10). I will now have an E40 blend.

https://www.getmtuned.com/ethanol-fu...ure-calculator

Now if I had E85 on pump instead of E98. For 10 gallons I'd need 4 gallons of E85 and 6 gallons of 91 (E10).

For your case, to get to 100 octane you can figure out the ratio by finding the octane rating of E85 (or whatever is coming out of your pump). E85=108ish octane.

 

I agree and just need to be reminded every so often.

My car runs great on 93. Just a bit better on the 100 tune.

I just can't bring myself to mess up the car / trunk with an invasive install of meth. The gains however are very attractive.


Hence this new vid of a Sam tuned (I'm pretty sure) 17 TTS with Meth and 68 VGT's beating a Tesla Plaid!!

 

93 is very strong on these cars indeed. HP is addictive crack.

I still blend for 93/94 unfortunately. Unless I pump 91 or 100 (only at 2 stations), I'm stuck with blending. Always envy you east coast guys.

On 93 my car can hang with a plaid from a 15 roll up till around 40 then the plaid pulls strong and ends up ahead by 4-5 car lenghts by the end.

 

Just an update with things I've noticed.. E85 drains the fuel tank FAST. I toned it down to E60 and fuel economy is noticeably better. Intake temps and Exhaust temps are tremendously low, even on E60. I can mash the throttle over and over and IAT's never climb above 84 degrees F. On 91 or 93 that was a recipe for 120F+ degrees IAT's which would pull timing. I'm assuming this is what happens on water meth injection also.

I have a very good feeling that E40 is going to work on this platform greatly. After talking to a pal and researching the internet it's proven that E40-E50 still carry the vast majority of E85 benefits all the while getting better MPG than E85. On basically every platform out there E85 is far to excessive on any OEM fuel pump, even Mclaren. Anything above E40-E50 is overkill unless you're swapping out components.

Can't wait to dial in the E40 tune. On E85 the car is barely making stock boost. On E40 the psi can be turned up much higher. Will update with results or make a new thread on E40.