2018 GMC 6.2 E85

Gagliano7 · July 29, 2020

I converted my 6.2 to E85. All I can say it is impressive. I have hptuners so I changed the timing some. I raced a new Subaru WRX from 60 to 100 and I was even till 85 and I started to slowly gain. I know they run 13.4 in the1/4. I also have a cai and a flowmaster cat back. For people that have converted to E85 how much timing do you run. This truck is impressive and I also can’t believe how good it handles for a 5500 lbs truck. E85 is a $1.69 where I am right now averaging 16 mpg. I also turned off afm when the truck had 40 miles on clock.

CamGTP · July 29, 2020

I run anywhere from 25-28 degrees max with a Lambda of around .89 (12.9-13.0 afr) on anything over 60% ethanol.

You can run it leaner on E85 with decent timing and still be just fine.

michigan2500hd · July 30, 2020

Damn I'm jealous. I've wanted to do this on my 2015 6.2 but not sure what to do about a tune. I just got a custom tune from Lee but he doesn't mess with e85, not sure why.

truckguy82 · July 30, 2020

Are you stupid for not running e85 calculator...... The answer is yes if you answer yes to both of these questions.

-do you have convenient access to e85?

-do you have a tune?

Edited July 30, 2020 by truckguy82

CamGTP · July 30, 2020

You hardly have to do anything to tune for E85. It's a matter of installing the sensor and enabling the features in the computer.

Past that you setup a commanded EQ ratio that is leaner than the pump gas EQ ratio as this way it can blend between the two commanded values depending on alcohol content and then make sure the timing tables for E85 are active.

TJay74 · July 30, 2020

16 hours ago, truckguy82 said:

Are you stupid for not running e85 calculator...... The answer is yes if you answer yes to both of these questions.

-do you have convenient access to e85?

-do you have a tune?

There is no need to run a E85 calculator, as long as you have installed the E85 sensor and turned on the E85 features in the OEM computer it is all handled by the ECM.

truckguy82 · July 30, 2020

27 minutes ago, TJay74 said:

There is no need to run a E85 calculator, as long as you have installed the E85 sensor and turned on the E85 features in the OEM computer it is all handled by the ECM.

Lol

it was a joke

It’s not a scientific calculator

it’s a

“are you stupid for not running e85” - calculator

Edited July 30, 2020 by truckguy82

Gagliano7 · July 31, 2020

With Hptuners E85 programming is easy. The hard part is installing the sensor but isn't that hard, The wiring is there but for my double cab and the way i did the fuel line(I didn't want to cut the fuel line) it wouldn't reach so i had extend the wiring. E85 is 1.69 where i am now. Plus it smells nice.

Gagliano7 · July 31, 2020

On 7/29/2020 at 5:27 PM, CamGTP said:

I run anywhere from 25-28 degrees max with a Lambda of around .89 (12.9-13.0 afr) on anything over 60% ethanol.

You can run it leaner on E85 with decent timing and still be just fine.

Thanks

Mileguru · July 31, 2020

I briefly looked into E85 on my 2017 6.2L Crew Cab with a Magnuson TVS1900 supercharger, but found out that it wasn't doable. That was a few years ago, so I don't remember why I couldn't do it. Was it because my stock injectors wouldn't flow enough fuel? Anybody know? I ended up running methanol to kick up the octane and add some timing.

TJay74 · July 31, 2020

3 hours ago, Mileguru said:

I briefly looked into E85 on my 2017 6.2L Crew Cab with a Magnuson TVS1900 supercharger, but found out that it wasn't doable. That was a few years ago, so I don't remember why I couldn't do it. Was it because my stock injectors wouldn't flow enough fuel? Anybody know? I ended up running methanol to kick up the octane and add some timing.

Very easy to get around this now:

-Replace in tank low side fuel pump with the LT4 in-tank pump (or equivalent)

-Replace the high pressure pump under the intake manifold with the LT4 HPFP

-Replace the low side inlet fuel line to the HPFP with the LT4 non-orificed line

-Replace the high pressure fuel lines with the LT4 lines

-Replace the fuel injectors with the LT4 injectors

-Add in E85 conversion kit of your choice

-Update the tune file to the LT4 fuel injector and pump data along with the fuel pump tables

-Revise tune for changes and turn on the E85 sensor in tune, clean up the E85 tables.

Enjoy being able to run about E50 while also picking up 50rwhp and not really needing meth going forward.

Edited July 31, 2020 by TJay74

Mileguru · August 1, 2020

17 hours ago, TJay74 said:

Very easy to get around this now:

-Replace in tank low side fuel pump with the LT4 in-tank pump (or equivalent)

-Replace the high pressure pump under the intake manifold with the LT4 HPFP

-Replace the low side inlet fuel line to the HPFP with the LT4 non-orificed line

-Replace the high pressure fuel lines with the LT4 lines

-Replace the fuel injectors with the LT4 injectors

-Add in E85 conversion kit of your choice

-Update the tune file to the LT4 fuel injector and pump data along with the fuel pump tables

-Revise tune for changes and turn on the E85 sensor in tune, clean up the E85 tables.

Enjoy being able to run about E50 while also picking up 50rwhp and not really needing meth going forward.

Oh yeah, it was the low and high fuel pumps too. Thanks for reminding me. Yeah, still don't want to do it, too much $$$. The 6.2L with the Maggie, smaller pulley, meth, and tune is good enough. Gotta avoid the rabbit hole.