Enyone know if the 6.0l 1/2 ton gmc trucks are Flex fuel engines?. My lease on my 2005 GMC sierra is up soon It has the 5.3l flex fuel engine I have been very impressed with running E 85 given that its 30cents cheeper per gallon to make up for mpg loss. The best part about E 85 is that its 105 octain you sure can tell a power diffrance with that kind of boost in octain. I plan on takeing my current 05 gmc to the track for some 1/4 mile times only mods Aem Brute Force intake system , E 85 ethinal. I will get back with the numbers.

 

I know there is a Z in the VIN# on all 5.3's that are flex...the 8th digit, not sure about others.

 

E85 is 105 octane? Does anyone make an E85 tune yet?

 

good question Im not sure if there is a tune for e 85 Ill try to find out.

 

I would really like to run my truck on E-85, but I don;t have a station that sells it that close to me The turbo would LOVE it, but the nearest one is 60 miles away and the last time I drove buy it the other day, 91 was $2.79 and E85 was $1.99

If your truck is not flex fuel then you need to be able to tune for whether or not you have flex fuel in the tank. I have though about when efilive get it standalone flashing for the V2 done, that I could have 3-4 tunes built for the various amount of ethanol I have in the gas and just flash in the appropriate tune since my truck is not flex fuel.

 

I could be wrong but I believe that the E85 trucks have a yellow gas cap and "Flex Fuel" badges on the rear. Not good to run E85 in something not designed for it. I believe that the major problem is with rubber and plastics that are not designed for it.

 

I always assumed the only difference is the tune and possibly a touch more Compression on an e85 engine.

 

I think that most all the fuel systems late model vehicles now a days can survive the ethanol. People bring up the plastic and rubber all the time, but I have yet to hear of anyone having any problems with them and I keep hearing of people switching over and retuning stock normal vehicles without problem. There are more and more "conversion kits" coming on the market that are nothing more then some electronic fooler boxes for the pcm to run E85 effectively. Just my opinion, like I said, it I could get it, I would tune and run it for sure!

 

I cant get E85 around here either Has anyone looked into making it? I'm sure I dont have the room to do it but it can be done.

 

i was researching this a while ago and am still thinking about it since my hptuners gets in this week. what i was told is that you just need to tune the eninge (ill post what you need to change once i find the thread) and maybe get larger injectors (i will be needing some anyway). E85 also does an amazing job on cleaning out the fuel system and engine i heard.