Recent Topics
Low oil pressure at idle
by Spetz
07/22/18 11:43 PM
Buy an extended warranty on HF Pressure washer?
by David2431
07/22/18 11:21 PM
2009 Matrix Bosal muffler
by expat
07/22/18 10:58 PM
Harbor Freight engines
by mx5miata
07/22/18 10:00 PM
Preventative Early Fuel Injector Cleaning?
by 2015_PSD
07/22/18 09:54 PM
Lawnmower fuel filter for old lawnmower engine
by Greaser73
07/22/18 09:23 PM
My wife is wanting a new car
by MParr
07/22/18 07:46 PM
Oil choices
by charmer37
07/22/18 07:22 PM
Lifeguard 8 and Audi 8hp55
by seanf
07/22/18 06:44 PM
2008 Tahoe loses power - electrical problem
by pacem
07/22/18 06:36 PM
How to clean wood trim?
by MajorCavalry
07/22/18 05:39 PM
Rotella T6 5w40 $12.97 after rebate
by dmiko
07/22/18 04:30 PM
Drivers not turning left with green light
by Mr Nice
07/22/18 04:25 PM
Someone hit my car
by Dylan1303
07/22/18 04:15 PM
Which spark plugs for 92 Olds 88?
by atikovi
07/22/18 02:54 PM
Electronic spark doesn't work on gas stove
by JLawrence08648
07/22/18 02:46 PM
Doorbell Button Bulb
by Yah-Tah-Hey
07/22/18 02:07 PM
AC/Blendoor Problem
by SilverFusion2010
07/22/18 01:53 PM
Suzuki 2.7L idle noise
by FlyPenFly
07/22/18 01:52 PM
TSC Rotella...YIKES!
by Greg L
07/22/18 01:48 PM
Newest Members
motogp46, Kyle0651, cavisco, firefox87, wiliweld
65534 Registered Users
Who's Online
33 registered (A_A_G, bugeye, CaspianM, Alex11111, 08z06, AVB, 2 invisible), 904 Guests and 29 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65534 Members
67 Forums
287498 Topics
4796056 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4514758 - 09/13/17 02:36 AM e85 conversion
SnowDrifter Offline


Registered: 08/24/14
Posts: 391
Loc: WA
I'm trying to evaluate if it would be practical or even feasible to convert my rig to flex fuel (2005 Tahoe w/ 5.3). I've tried searching and got answers ranging from different injectors (32lb vs 26lb) and the associated reflash to different fuel pumps, soft lines, gas caps, and fuel composition sensors.

I'm at a dead end with my research and have yet to find any reliable info.

Anyone here know anything about it?

Top
#4514769 - 09/13/17 03:16 AM Re: e85 conversion [Re: SnowDrifter]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5293
Loc: Fort Lauderdale, FL
The sensors make sense. E85 is rarely exactly 85% ethanol, so you would need something to be able to make adjustments according to alcohol content.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

Top
#4514809 - 09/13/17 06:10 AM Re: e85 conversion [Re: SnowDrifter]
Cujet Offline


Registered: 02/15/03
Posts: 7248
Loc: Jupiter, Florida
Interestingly, some people find that their non flex fuel vehicles run just fine on E85. I don't know whether your setup is one of those without any issues.

Just a quick search and I found that your vehicle may in fact be flex fuel, without any badges or indication that it is.



QUOTE from link below: "I believe all tahoes of that style are e-85 capable"

http://www.gmtruckclub.com/forum/threads/do-all-00-05-z71-tahoes-accept-e85-fuel.22622/

And according to the old list at ethanol.org, your vehicle will run on E85. 5.3L Vortec-engine Suburban, Tahoe, Yukon and Yukon XLs http://www.walleyecentral.com/forums/archive/index.php/t-41121.html


Edited by Cujet (09/13/17 06:16 AM)
_________________________

Top
#4514853 - 09/13/17 07:17 AM Re: e85 conversion [Re: SnowDrifter]
Chris142 Offline


Registered: 06/05/03
Posts: 16978
Loc: Deplorable in apple valley, ca
Gm shows 2 different vin numbers. The "T" is not e85 compatable I understand and the other is. I do not know where the difference lyes.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

Top
#4514857 - 09/13/17 07:32 AM Re: e85 conversion [Re: SnowDrifter]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1236
Loc: Winchester, Indiana
Snow, unless you are getting the e85 for SIGNIFICANTLY cheaper than 87 octane, it will be a lose-lose situation. E85 has about 30% less energy than gasoline, so your mileage will go down accordingly. You don't appear to have a turbo or supercharger, so the cooling effect of the vaporization temp of e85 will be wasted as well, and if your engine is otherwise stock, the roughly 105 octane will hinder combustion as well.

If you're insistent on doing it, yes, you will likely need significant fuel system upgrades to deal with the corrosive nature of ethanol, and you will need injectors that are roughly 50% larger. This isn't including getting your ECM tuned to deal with the additional fueling requirements, and unless your truck had been flex fuel from the factory, fuel composition sensors will probably be waaay more expensive and involved than would ever be worth it. IMHO gasoline has been the primary mover of cars and light trucks for over 100 years for a good reason- it's energy-dense, readily available, and pretty cheap. That's still not going to change anytime soon.

Top
#4514864 - 09/13/17 07:46 AM Re: e85 conversion [Re: SnowDrifter]
TinyVoices Offline


Registered: 09/12/16
Posts: 494
Loc: Vienna, VA
For a stock daily driver I would not bother with it. You won't save the money it's going to cost you to set the truck up for e85. You will get worse fuel mileage on e85.

The season people convert their modified cars (turbo cars) to e85 is because you can make more power with a simple tune and you can get it at most gas stations. For your situation, I'd say it's not worth it.
_________________________
1993 Toyota MR2 Hardtop N/A - 157k miles - Valvoline Max Life 5w30
2006 Toyota Matrix XR AWD (Fiancee) - 126k miles - Valvoline Max Life 5w30

Top
#4514893 - 09/13/17 08:37 AM Re: e85 conversion [Re: SnowDrifter]
BrocLuno Offline


Registered: 09/06/15
Posts: 5625
Loc: Kalifornia Kollective
E-85 is a street racers dream. But to get the benefits, you need enough compression to make it worthwhile ... Even w/o boost (turbo, or blower) you can make E-85 work, but it means building an engine for alcohol. You wanna do that ...

I had an issued E-85 Flex Fuel truck at work. Running a basic gasoline motor of roughly 9:1 compression on E-95 was a waste of money and fuel. Sure, it ran OK, but got something like 2/3 the normal mileage, so range was way down. The fuel cost was about the same with the savings on the pump price. Not worth it.

E-85 would be great stuff if it was not made from corn. If it was made from grass or other crops grown on marginal land, sure good stuff. But primary food crop conversion is not a sensible thing.

In Argentina and Brazil where they have a large amount of sugar cane refining by-products, it makes great sense. Here, not so much ...
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

Top
#4514909 - 09/13/17 08:50 AM Re: e85 conversion [Re: BrocLuno]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 4068
Loc: New England
Originally Posted By: BrocLuno
E-85 is a street racers dream. But to get the benefits, you need enough compression to make it worthwhile ... Even w/o boost (turbo, or blower) you can make E-85 work, but it means building an engine for alcohol. You wanna do that ...

I had an issued E-85 Flex Fuel truck at work. Running a basic gasoline motor of roughly 9:1 compression on E-95 was a waste of money and fuel. Sure, it ran OK, but got something like 2/3 the normal mileage, so range was way down. The fuel cost was about the same with the savings on the pump price. Not worth it.

E-85 would be great stuff if it was not made from corn. If it was made from grass or other crops grown on marginal land, sure good stuff. But primary food crop conversion is not a sensible thing.

In Argentina and Brazil where they have a large amount of sugar cane refining by-products, it makes great sense. Here, not so much ...


I know that E85 is popular with Subie turbo modders, but I believe I read that they have to modify the entire fuel delivery system since they need to pump so much more of it in a given time than with gas?? I've never seen an E85 pump around me and there seem to only be a few in all of New England, so E85 is just an academic topic as far as I'm concerned.
_________________________
2014 Forester XT, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter

Top
#4514936 - 09/13/17 09:21 AM Re: e85 conversion [Re: SnowDrifter]
Cujet Offline


Registered: 02/15/03
Posts: 7248
Loc: Jupiter, Florida
I have a turbo S2000 that I can run on E85, when I want. I have a stand alone computer that is easily configured to either setting.

However, I can easily put E85 in it and drive it home on the conventional gas program. Like most cars, the system operates in closed loop (relies on the (wideband in my case) O2 sensor) to adjust Air/Fuel. It only has lean operation difficulty when under boost on E85 and the Gas program.
_________________________

Top
#4515732 - 09/14/17 01:06 AM Re: e85 conversion [Re: SubieRubyRoo]
zorobabel Offline


Registered: 01/27/11
Posts: 507
Loc: Anaheim, CA
Originally Posted By: SubieRubyRoo

If you're insistent on doing it, yes, you will likely need significant fuel system upgrades to deal with the corrosive nature of ethanol, and you will need injectors that are roughly 50% larger. This isn't including getting your ECM tuned to deal with t

I've seen this corrosiveness mentioned a lot, but haven't run into evidence. In my mind, if the rubber can take E10, it should be able to handle E-85.
I do remember a Finn on this board blowing up his Saab engine on E-85-ish fuel.
_________________________
1997 Maxima 180k, Delvac 15w40, Wix 51315
2004 Corolla 190k, VWB 5w20 + SSS 10w40, MGL4967

Top
#4515736 - 09/14/17 01:29 AM Re: e85 conversion [Re: SnowDrifter]
SnowDrifter Offline


Registered: 08/24/14
Posts: 391
Loc: WA
Looks like the cost/benefit isn't there for this one. Though for anyone interested, the major bits in the conversion require the following: L59 fuel injectors, flex fuel comp sensor ACDelco 12570260, and an ECU for an L59. Will likely need some other minor parts like fuel lines to connect to the fuel comp sensor too

Top
#4520684 - 09/19/17 08:24 PM Re: e85 conversion [Re: SnowDrifter]
jhellwig Offline


Registered: 07/01/13
Posts: 1574
Loc: Ottumwa, Iowa
Originally Posted By: SnowDrifter
Looks like the cost/benefit isn't there for this one. Though for anyone interested, the major bits in the conversion require the following: L59 fuel injectors, flex fuel comp sensor ACDelco 12570260, and an ECU for an L59. Will likely need some other minor parts like fuel lines to connect to the fuel comp sensor too


It only takes around a 50 cent spread on these vehicles to make e85 more cost effective.

I think that 04 was the last year gm used the alcohol sensor but I may be wrong. They went off o2 trim after that. You shouldn't need any line upgrades as there wasn't a difference between flex and non.

I have no proof of this but I belieave the only difference between flex fuel vehicles and their non flex fuel twins in the mid to late 2000s is that the money wasn't paid to certify the emmisions for e85.
_________________________
Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350

Top