philbilly20 Posted December 10, 2014 Share Posted December 10, 2014 Purchased new 2015 with the 5.3, exactly how I wanted it except for flex fuel capability. Is there a way to run E85 with a tune or factory unlock? From what I have been reading it is just different tuning capabilities of the computer to adapt to it but correct me if I'm wrong. Or is the e85 not worth it? I like the increased performance and price difference between 87 or 91, even with the detrimental mileage results. Plus I like to support the industry, but that's a whole 'nother story! Thanks- Philbilly Link to comment Share on other sites More sharing options...
KARNUT Posted December 10, 2014 Share Posted December 10, 2014 Purchased new 2015 with the 5.3, exactly how I wanted it except for flew fuel capability. Is there a way to run E85 with a tune or factory unlock? From what I have been reading it is just different tuning capabilities of the computer to adapt to it but correct me if I'm wrong. Or is the e85 not worth it? I like the increased performance and price difference between 87 or 91, even with the detrimental mileage results. Plus I like to support the industry, but that's a whole 'nother story! Thanks- PhilbillyE85 gives you 25HP, I lost 2MPG in town and three on the HWY. With KR on 87 gas and the resulting lost performance I run 93 gas when I cant get E85. In my area that's about 1$ per gallon. Even if was the same price I would still use E85, the performance is that noticeable. I just notice you cant run E85? News to me bummer. Link to comment Share on other sites More sharing options...
redwngr Posted December 10, 2014 Share Posted December 10, 2014 For the 15's, flexfuel became an option on the 5.3. RPO is FHS. FHS is included with the 4.3. Link to comment Share on other sites More sharing options...
Chris Posted December 10, 2014 Share Posted December 10, 2014 If the past is any indication, to run E85 you need a larger pump, injectors, and tune Link to comment Share on other sites More sharing options...
nards444 Posted December 10, 2014 Share Posted December 10, 2014 Dead give away on a chevy is the yellow gas cap. But as far as I know its a tune and module, which if you dont have it can be found after markert, and possibly even from a dealer. E85 can give you up to 25hp but you also lose roughly around 25% in fuel economy. IMO if the price in your area makes E85 more than 25% cheaper than regular gas I would use it, but if its not more than 25% cheaper than E85 doesnt make sense to me. Link to comment Share on other sites More sharing options...
KARNUT Posted December 10, 2014 Share Posted December 10, 2014 Dead give away on a chevy is the yellow gas cap. But as far as I know its a tune and module, which if you dont have it can be found after markert, and possibly even from a dealer. E85 can give you up to 25hp but you also lose roughly around 25% in fuel economy. IMO if the price in your area makes E85 more than 25% cheaper than regular gas I would use it, but if its not more than 25% cheaper than E85 doesnt make sense to me.No value for 25HP? LOL! Link to comment Share on other sites More sharing options...
nards444 Posted December 10, 2014 Share Posted December 10, 2014 No value for 25HP? LOL! Didnt say no value, just said doesnt make sense for me. Link to comment Share on other sites More sharing options...
redwngr Posted December 10, 2014 Share Posted December 10, 2014 According to a techlink article on the 2014's, the flexfuel (e85) engines have a fuel sensor to determine the ethanol/gas blend. Flexible Fuel Sensor The flexible fuel sensor of the 4.3L V6 and 5.3L V8 measures the ethanol-gasoline ratio of the fuel being used in a flexible fuel (E85 capable) engine. Flexible fuel vehicles can be operated with a blend of ethanol and gasoline, up to 85 percent ethanol. Since the flexible fuel sensor measures the actual percentage of ethanol in the fuel, it is no longer necessary to wait for an empty fuel tank in order to refill with E85. The flexible fuel sensor measures the two different fuel related parameters, and sends an electrical signal to the ECM to indicate ethanol percentage and fuel temperature. The flexible fuel sensor uses quick-connect style fuel connections, an incoming fuel connection, and an outgoing fuel connection. All fuel passes through the flexible fuel sensor before continuing on to the fuel rail. Link to comment Share on other sites More sharing options...
Northside Posted December 11, 2014 Share Posted December 11, 2014 The 25 h.p. is max at high r.p.m. where we rarely drive. The real "value" of E-85 to me is that the trucks throttle response is a lot better, and the truck seems to have more power in all driving situations. It's a lot spunkier and more fun to drive. I'd run it even if were cost more than regular gas. I'd like to see a dyno chart for the 5.3 on gas, then on E-85, then the 6.2. Link to comment Share on other sites More sharing options...
vetteboy9 Posted December 11, 2014 Share Posted December 11, 2014 I ran E-85 for two tanks, was actually quite nice, ran even smoother and had a noticeable bit more power. Around Houston at the moment E-85 is costing about 20-30 cents MORE per gallon than regular, actually quite depressing. Maybe next year the prices will drop back to 30 cents a gallon under gas to make it more economical. Link to comment Share on other sites More sharing options...
redwngr Posted December 11, 2014 Share Posted December 11, 2014 Haven't found a 5.3 w E85 Link to comment Share on other sites More sharing options...
310racing Posted December 11, 2014 Share Posted December 11, 2014 The only negative I have found with E-85 is the cold start up. Don't like the extra rotations before startup. It does seem to rev quicker, but it feels as if it has less torque....prob just me. Link to comment Share on other sites More sharing options...
KARNUT Posted December 11, 2014 Share Posted December 11, 2014 I ran E-85 for two tanks, was actually quite nice, ran even smoother and had a noticeable bit more power. Around Houston at the moment E-85 is costing about 20-30 cents MORE per gallon than regular, actually quite depressing. Maybe next year the prices will drop back to 30 cents a gallon under gas to make it more economical.I don't run 87 gas because of the KR and I have a tune, so its cheaper for me. In Conroe on one end of town E85 is the same as 87, at stripes where I buy its 10cents cheaper than 87. The truck likes E85. Link to comment Share on other sites More sharing options...
Gmcant33 Posted December 11, 2014 Share Posted December 11, 2014 Is e85 just plain and simple better ?? I use 87 or should I just u 93 ?? I'm confused as to which is the best Link to comment Share on other sites More sharing options...
KARNUT Posted December 11, 2014 Share Posted December 11, 2014 Is e85 just plain and simple better ?? I use 87 or should I just u 93 ?? I'm confused as to which is the bestIn the year that Ive been following this forum, most tuners have said our trucks don't perform well on 87 gas, some use 89 gas. I was hesitant to use E85, at first. Now I only use it, the trucks performs very good on it. Link to comment Share on other sites More sharing options...
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