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Zeus24v 09-20-2012 02:37 AM

3.7L E85 transformation
Hi all,

I need some advice, I'd to convert my 06 3,7 in a flex fuel engine...

at this time I m running around 50/50 unlead/E85, and I m still too lean at the ODBII.

My question is, if I put bigger injectors, may be I could make the O2 sensor happy and let the ECU work gently with more fuel in the cylinders ?

Thanks a lot!!

4.whoa 09-20-2012 09:05 AM

Re: 3.7L E85 transformation
I think that would help,but dont think it would make it right. I looked into converting my xj a while back and found something about the "target" for the o2 sensor being different for e-85 so it cant reach the proper "goal" when setup for gasoline. the flex fuel vehicles (from what i read) have sensors that can tell how much of what fuel the mix is, and have the programing to compensate.

Zeus24v 09-22-2012 11:41 AM

Re: 3.7L E85 transformation
Thanks, I had a ZJ 5.2 before my WK, he was running with E85 without any modification.
and the XJ was cool with it too except the RENIX.

mTBrunner83 09-22-2012 11:54 AM

Re: 3.7L E85 transformation
I am just curious as to why E-85? The savings? The efficiency? The less amount of fossil fuels? Burns cleaner?

4.whoa 09-23-2012 09:10 AM

Re: 3.7L E85 transformation
the 2 main benefits of E 85 are its high octane (105+ usually ) & it burns a lot cooler (like alcohol ). its way cheaper then racing fuel if you're running high compression or boost, and it keeps inlet temperatures down quite a bit with higher boost .
when compared to racing fuel it's a lot cheaper but while its cheaper at the pump usually ,you burn somewhere between 20-30% more ,so I don't know if it's cheaper for daily use.

jerkylips 09-23-2012 11:35 AM

I've heard that e85 is more corrosive, and flex fuel vehicles come with stainless steel fuel lines because the e85 will rot out regular lines. So if you're going to do a conversion, check into that. I don't have any documentation on it, just what I've heard..

robpp 09-23-2012 01:28 PM

Re: 3.7L E85 transformation
i had a 4.7 07 FF WK.

it cost an extra 1,340 for the FF motor/that was for a beefed up fuel system that could take the E85 as it corrosive.

also during the gas run up around the time of Katrina I used the E85. There was about a 20-25% less gas mileage. So the price differential needs to be at least that.

Gas = $4.00 gal
E85 = $3.20 gal

NO SAVINGS due to less miles per gallon. savings has to be greater than 20% or you spending MORE.

in my experience the gas company knows this exact forumal and prices the E85 accordingly. you dont buy it.

one last note: if the station sells very little E85 dont buy it. it gets all F'ed up if it sits around too long. also, I had a superchips, intake, exh, etc. and never noticed any difference.

now your 06 might be able to get a bunch more tuning than the 07+ so maybe you could get more perf IDK.

good luck/

FlyinRyan 09-23-2012 11:05 PM

Re: 3.7L E85 transformation
06= untunable save for mail order flash. you will need bigger injectors, and the fuel system modified to suit the more corrosive E85.

Some of the newer NGC PCMs are "Ethanol Aware", from what I've encountered, the 3.7/4.7 are not.

Zeus24v 09-26-2012 11:07 AM

Re: 3.7L E85 transformation

Originally Posted by mTBrunner83 (Post 687042)
I am just curious as to why E-85? The savings? The efficiency? The less amount of fossil fuels? Burns cleaner?

Yes, for all of that!!

and here unleaded cost with a currency converter: $1,98 /Liter : a gal=3.8L

E85 $1.23 /Liter

Ryan, what size of injectors are installed on stock 3.7 ?

as I said on a ZJ after 2 1/2 years of 100% e85 I never found a leak or a gasket destroyed or cracked on fuel lines.

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