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I did a quick search and didn’t come up with anything on here. I see lots of other 4.x Turbo cars from other manufacturers are doing an ethanol mix to come up with an E30 blend and seeing excellent results, even on the stock tune.
Has anyone tried this? What were your results?
I ran race fuel in my car for one rally, and it made a huge difference (car has downpipes and tune currently). Hoping an E30 mix can be a better solution to the $8/gallon race fuel.
If you don’t have an real world experience with our cars on using this mix, please don’t post. I’ll just ignore the “you’ll shoot your eye out” comments.
Your post was intriguing to me since I accidentally loaded a tank of E30 thinking it was an ethanol free pump.. I was really concerned that I was putting more corn syrup thru my engine..So I googled searched E30 and found a study from fueleconomy.gov. article ORNL/TM-2015/116. While most of the article was over my head, the summation was pretty clear.. in fact, E30 is a much higher octane grade and on 4 different test vehicles (none high performance) the WOT test from 15-80 mph showed anywhere from a .25 to .50 to 1.00 sec improvement with stock settings... also, mpg fell almost 8.5 - 10% .. So if you are tracking your car with E30, you should see a very nice improvement in acceleration but be ready to use more fuel...but at a much lower cost than track fuel...
Your post was intriguing to me since I accidentally loaded a tank of E30 thinking it was an ethanol free pump.. I was really concerned that I was putting more corn syrup thru my engine..So I googled searched E30 and found a study from fueleconomy.gov. article ORNL/TM-2015/116. While most of the article was over my head, the summation was pretty clear.. in fact, E30 is a much higher octane grade and on 4 different test vehicles (none high performance) the WOT test from 15-80 mph showed anywhere from a .25 to .50 to 1.00 sec improvement with stock settings... also, mpg fell almost 8.5 - 10% .. So if you are tracking your car with E30, you should see a very nice improvement in acceleration but be ready to use more fuel...but at a much lower cost than track fuel...
I’ll take a look at the article. I’m used to running full e85 in other vehicles like my previous 1k RWHP CTS-V and also used to the 6-9 MPG that I would get with it. More than worth it! Love the corn!
Did you baby your car after the accidental fill up or take advantage of it?
Well, the tank full went into a 58 300SL roadster... I've since driven a couple hundred miles and filled up again with non-ethanol fuel... the ole' gal didn't seem to be more perky with the E30...she is 63 and the ignition spark may be getting a little weak !
Well, the tank full went into a 58 300SL roadster... I've since driven a couple hundred miles and filled up again with non-ethanol fuel... the ole' gal didn't seem to be more perky with the E30...she is 63 and the ignition spark may be getting a little weak !
Lol that gave me a good laugh!
On another note, my tuner got back to me, and I’m now running E30 in the car. Going to give it a couple tanks for the car to learn everything then do some pulls on Dragy to see if there’s any noticeable difference.
Ethanol is a tuner's dream fuel. E85 is about 105/108 octane depending on the accuracy of the blend. Once you start really boosting engines there is no pump fuel that is going to work well to take full advantage of the boost. Cylinder pressures and cylinder temperatures quickly fall out of an acceptable operating range when you try to make 93 octane fuel work with too healthy of a boost. I'll give a live example below and one that I tuned for E85. The engine was a V8 NA (not MB, but similar principle). This is a generic example as some engines based on the valve/cam design will extend the red circle to the right by a little more RPM.
This table is the high octane timing table with values pretty common on any NA V8. The region of the table highlighted is roughly the PE range after leaving closed loop.
The critical area for PE is in the range of 4K rpm to 6K rpm and with a spark air mass of approx, .80 to 1.00. The timing values in these cells optimize performance of 93 octane fuel in PE
Now if I seriously increase cylinder pressure under boost.
In PE, I am seriously reducing timing in the cells of the same range (but adding a spark air mass all the way out to 1.36) just to prevent spark knock. If I can increase octane past 93, in fact, all the way past 105 (with E85), I can come close to returning timing in the cells in the PE range to the original NA values. This makes for a whole bunch of performance. This comes with a warning - you cannot fill up especially with E85 if you're not tuned for it. A lot more to say here, but this would get unmanageably long.
Last edited by Acta_Non_Verba; Oct 26, 2020 at 09:34 PM.
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