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 E85 in my GN 
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Joined: Mon Jan 26, 2009 7:39 am
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Location: Shenandoah, PA
Post E85 in my GN
Been reading over at the Turbo Regal forums that some guys are running a 70/30 gasoline / E85 mix in their cars - basically 4gal E85 to 10gal 93 octane in a full tank. Benefits would be less knock and higher boost for the turbo cars, almost like using alcohol injection. It's really appealing to me since the car is now making quite a bit of boost quickly during daily driving. I've also heard all the stories about corroded fuel tanks and damaged lines. I've already taken care of a lot of the recommended upgrades, like fuel pump, injectors, and hotwire kit (maybe would just need to swap fuel filters). Was wondering what some of your opinions were on this.

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Sun Aug 12, 2012 7:13 pm
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Joined: Mon Jan 26, 2009 11:22 am
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Location: Schuylkill Haven, PA
Post Re: E85 in my GN
If you have the rubber to handle the E85, I would imagine you would be good.

Would that require anything tune wise?



Is your GN at Stump's right now? I thought I saw it yesterday sitting out front.

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Sun Aug 12, 2012 9:37 pm
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Post Re: E85 in my GN
The fuel tank may be an issue over the long haul. I think STA-BIL has a treatment to help keep the moisture level down when you use ethanol. Most of the fuel system should be ethanol resistant, but it was geared more toward E-10/15. To do it "right" I would get stainless steel fuel lines and possibly replace your rubber fuel hoses with braided stainless, and accept you will have to eventually replace the tank. Other thing is making sure you have enough injector to handle the additional fuel without maxing their duty cycle. You will also need to get a new chip burnt for E85, the MAF will not be able to compensate

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Mon Aug 13, 2012 10:33 am
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Post Re: E85 in my GN
Might consider going a step further and getting the braided lines with the teflon liner.

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Mon Aug 13, 2012 1:25 pm
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Post Re: E85 in my GN
Batman wrote:
Other thing is making sure you have enough injector to handle the additional fuel without maxing their duty cycle. You will also need to get a new chip burnt for E85, the MAF will not be able to compensate


Current injectors are 60# with a matched chip and Walbro pump, so I don't anticipate issues with fuel delivery.
I'm not planning on running straight E85. Most of the guys that have piped up are running a 70/30 mix, 93 octane/E85, and not seeing any knock or doing any other tuning. I just question the wisdom of that, not knowing what long-term effect it would have on the motor. I could pick up the STABIL product to use, would the addition of E85 to 10gal of 93 octane be that destructive?

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Mon Aug 13, 2012 6:46 pm
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Post Re: E85 in my GN
It won't be as bad as straight E85, but yeah as you increase ethanol content it will increase the amount of moisture the fuel can/will hold. If you aren't going to go with a full E85 set-up i wouldn't even bother mixing it unless you are going to a racetrack. On the road you probably won't see a huge difference.

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2002 Trans Am MRM Convertible
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Tue Aug 14, 2012 10:46 am
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Post Re: E85 in my GN
What modifications are done to "Flex Fuel" vehicles from the factory? What differences would there be between a Flex Fuel car and a traditional gasoline-powered vehicle?

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Thu Aug 16, 2012 5:39 pm
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Post Re: E85 in my GN
Biggest thing is the fuel composition and temperature sensor/module so it can tell the difference between fuels. also additional MAPS in the PCM, stainless fuel rails and sometimes lines, bigger fuel pump, bigger injectors, different fuel filter. But def the big deal is the sensor and module.

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9/11/01 NEVER forget!
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2002 Trans Am WS6 #206 346CI of unbridled fury *gone 4 ever*


Thu Aug 16, 2012 9:04 pm
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