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      05-26-2020, 11:07 AM   #23
beanfritter
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Originally Posted by Commanderwiggin View Post
E85
I sometimes put ~3 gallons of E85 in my tuned GTI and then fill the rest of the way up with 91. The car likes it.

Does anyone do this with their M2s?
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      05-26-2020, 11:10 AM   #24
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Originally Posted by omasou View Post
Sunoco in my area offers 91 and 93. I can definitely tell a difference—car runs better/smoother—when running 93. Even the X5 ran better.

As one poster mentioned, make sure it doesn't contain lead or you'll kill the cats.
I noticed this as well. I run it in my X5 50i M-Sport and the V8TT loves it. It’s a animal and my draggy times have shown the fuel makes a difference.
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      05-26-2020, 11:19 AM   #25
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Originally Posted by Blue2 View Post
Our local track has 93, Sunoco GT 100 octane (unleaded), and higher octane race fuels all at pumps. Any benefit or harm in adding a gallon or two of 100 octane to a tank full of 93 octane before hitting the track? Car is stock, no tune.
Great question. Believe it or not, on a stock tune, octane makes a huge difference. The S55 has BorgWarner turbochargers and the latest (v3.06 - Sept 19) software that utilizes the octane in your tank to regulate boost pressure. I also made all of that up. I don't think it does anything if your octane levels are above 91.
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      05-26-2020, 11:37 AM   #26
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Originally Posted by Bumpinjeep View Post
Great question. Believe it or not, on a stock tune, octane makes a huge difference. The S55 has BorgWarner turbochargers and the latest (v3.06 - Sept 19) software that utilizes the octane in your tank to regulate boost pressure. I also made all of that up. I don't think it does anything if your octane levels are above 91.
unhelpful, but funny
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      05-26-2020, 01:56 PM   #27
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...The S55 has BorgWarner turbochargers...
Factory S55 Turbos are made by Mitsubishi
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