[fordem]

So - are you going to fit a Haltech flex fuel sensor - or - are you going to switch out the entire engine management system for a flex fuel capable Haltech system?

Someone correct me if I'm wrong - would you not also have to make significant fuel system modifications (apart from the engine management electronics) to be able to run E85? Things like higher capacity fuel pumps, larger fuel lines, larger injectors, etc.? Doesn't a greater percentage of ethanol require a correspondingly larger volume of fuel to deliver the same power?

Maybe I'm missing something, but the way I see it is that it's not economically viable to retrofit an existing vehicle capable of say E10 operation to run E85 - the cost of the modifications would be such that you could never recoup it via the cost saving in the fuel used - am I wrong on that?

[henno]

You are absolutely correct on all fronts, fordem.

[Gwagensteve]

Not to mention that Jimny's have a small fuel tank and short range already. Those two problems aren't addressed by use of E85

[Qthefun]

wasn't planning on running e85. was just toying with the idea of running after market ecu and fuel management if/when they implement ethanol into all fuels as a "save the earth" type policy.

I am still in a tuner mind set (love fast cars) and still trying to adapt to the 4x4 way of thinking

Also the brains trust on here is epic! where were you guys when I was young and asking tons of hard questions!

[fordem]

Personally I don't see an aftermarket ECU/fuel management system as a financially viable option on a daily driven vehicle, and to make it clear where I'm coming from, for what it will cost to purchase, install & properly tune such a system, you're probably looking at 50% of the value of the vehicle - time to trade-in/up and move on. I'd also like to believe that any of the more recent (and therefore higher value vehicles will be OBDII equipped and will have the capability to accommodate, at least 10, and maybe as much as 15% ethanol, without any reprogramming - possibly making an after market system a non-issue.

I'd like to think I understand where you're coming from, as I live in a country that was once largely dependent on cane sugar as a foreign exchange earner, and more to the point, allowed itself to become dependent on preferential pricing from the European Union, which has now been removed. Discussions on how to deal with sugar have been ongoing for sometime (it's a political football), and of course, ethanol as a motor vehicle fuel has arisen - the problem as I see it is that, here, as I believe is the case in Australia, there are many, many vehicles that still run carbureted engines, or that are still OBDI, with no O2 sensor, and no way to sense or adjust for fuel type, or ethanol content.

The cost of retrofitting those older vehicles to burn ethanol based fuels or even an E10 gasoline/ethanol mix will simply be more than the vehicle is worth.

[Moph]

Gwagensteve wrote:

Stock carby Sierras do not benefit from 98...

With my rebuilt carby G13BA (and 31s / 6.5s):

- stock 10* BTDC and 91 RON; will cruise at 110kph in 5th on the flat without headwind
- 12* BTDC and 98 RON; will cruise at 110kph in 5th on slight up gradients with slight headwind
- >10* BTDC and 91 RON; pings

I've done more highway kilometres than most in my Sierra, and I have found a tangible difference at cruising speeds between 91 and 98 RON. It's not some seat-of-the-pants-wow-that's-faster-off-the-line experience (because I've noticed nothing of the sort) but rather gear-holding ability in 5th on the highway, both with and without trailer attached. There is far less gear shifting required when running 98 RON and an extra couple of degrees of advance.

No argument that you'll have bugger all difference running 98 RON on stock timing though. I also have a scribed mark on the dizzy bracket that lets me roughly adjust timing back to 10* on the road if I need to run 91 RON.

[Qthefun]

will do a tank or 2 of 95 and then 98 when I get my obd11, should have data logging if not will try to write it all down professional like my new vvt might benefit (I hope!)

[Perram]

Hey i am getting 9.8L per 100km
I usually fill up at 330ks.
I have a speedo app on my phone which does trip meter aswell.

And for towing. I was getting 11.7l on my last trip.

31 roof basket
Tyre/jerry can holder
Bar work
Draws
6.5s
Granny driver

Sent from my SM-G900I using Tapatalk

[4x4xzook]

Thanks for the feedback.
Safe to say i should expect between 300 -350ks out of a tank.

im running a very similar set up as you peram.

[jdk81]

Bone stock drover about 10l/100km.

My friends tintop
2" bl, 2" suspension lift, 31s, g13ba, stock gearing, extra rubber flares and roof rack, was about 12L/100km.
Before and after rebuild, didnt seem to make much difference.

My soft top
31s, 7.2 xfer, 2" bl, 2" suspension lift, was about 12L/100km.
Even after going g16a, bullbar, changing a few things the economy was about the same.
Car was stupid heavy and often lots of hill work and headwinds.

About the only time i could get awesome economy 8L/100km was slip streaming trucks or staying below 80km/h.

Now
G16b, aw4, 4.16 xfer, 4.875 diffs, 33s, no lift, big nasty guard chop, no inner guards, big flares, and exhaust unblocked.
So much more power available, it can get the speedo well off the dial (accurate speed too).
All the extra power = always at speed limit +3 km/h, the aerodynamics suck much worse than stock and fuel seems to be about 16l/100km (50l tank).
Driving slow the fuel economy is acceptable.

The nut behind the wheel is a huge factor.

[Qthefun]

jdk81 wrote:

The nut behind the wheel is a huge factor.

this!

if you baby any car and drive it nice within racing lines (eg: straightest lines through corners) and not go flat out every where it will keep everything happy and get less fines

My whole driving technique has changed for the better since getting the jim

[fordem]

Qthefun wrote:

drive it nice within racing lines (eg: straightest lines through corners)

On the public roads??? Ever heard of lane discipline???

[Qthefun]

fordem wrote:

Qthefun wrote:

drive it nice within racing lines (eg: straightest lines through corners)

On the public roads??? Ever heard of lane discipline???

Not meaning use the whole road just using what is legal between the white lines on your side of the road (Jimny is only 1/2 a lane wide lol)

I do this in an 8.5 ton truck, saves fuel!!!