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L83 5.3L Flex fuel conversion with Dyno sheets. Followed with tune and more dyno sheets.

Alec Kerchner

By Alec Kerchner
in Engines & Drivetrain

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CamGTP
CamGTP

There are only two main timing tables. A high octane timing and a low octane. The high octane table is always used no matter what. It will revert to the low octane table when a knock event happens. Th

CamGTP
CamGTP

Here are two screen shots from a 2015 Silverado file.   The high octane table and the flex fuel spark adder table. The numbers in the flex fuel table should be what it would add if the multi

Alec Kerchner
Alec Kerchner

Shaved 3 tenths in the quarter after the conversion is done. That's at 73% ethanol. 

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Alec Kerchner Enthusiast

Alec Kerchner

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1 hour ago, CamGTP said:

Who is doing the tuning?

No idea yet. Haven't thought about it. +20whp on the stock tune will do it for a while. I will probably mess around with it for a little while. I need to see what tuners in Chicago are good with Gen V trucks. 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted (edited)

Well, who did the tune to enable the flex fuel?

 

Or do you own the software to make those changes?

 

I can easily just post a few tunes I've made here.

Edited by CamGTP
  • Like 1
Alec Kerchner Enthusiast

Alec Kerchner

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34 minutes ago, CamGTP said:

Well, who did the tune to enable the flex fuel?

 

Or do you own the software to make those changes?

 

I can easily just post a few tunes I've made here.

I did. I purchased HP tuners. All I did for the time being was enable the sensor, the corresponding MIL codes and filled in the alcohol afr table. I didn't want to do anything outside of OEM parameters. This was purely to show what the power gains on the stock GM tune is with ethanol.

 

"I can easily just post a few tunes I've made here." What do you mean by this?

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

What I mean is that I can post tune files I have made for myself and other people that you can use if you want or at least see what I do to them.

 

They will have improved changes over the OEM settings. For things like power enrichment, commanded air fuel ratio on gasoline and ethanol. Minor timing changes and engine torque mngt changes.

 

If that is a 6 speed truck (probably not because it's a denali) I know how to make them shift and act way better than stock.

 

Post your current tune here if you want too. I'm curious what it looks like compared to the other 2015 file I have.

  • Like 2
Alec Kerchner Enthusiast

Alec Kerchner

Posted
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Posted

I would be very interested in looking those over if you don't mind. I do in fact have the 6l80 trans due to having a Denali with the 5.3. I will post my stock file as well as the file that i made the changes to run Ethanol. 

 

I appreciating you helping me with this! 

Alec Sierra stock tune no ccm no changes.hpt Alec Sierra stock tune + E85.hpt

  • Like 1
CamGTP Senior Enthusiast

CamGTP

Posted
Posted (edited)

This is a 2015 Silverado 5.3/6L80e combo. It should be almost exactly the same as your truck calibration wise, when it was stock.

 

I went through and just updated this file and changes a few more things that I normally do now. Feel free to use the changes and ask questions about it. The engine stuff and transmission changes will make it drive like a different truck. Remember that you are just copying the changes and not writing my file to your truck as that won't work. You can open my file with yours using the compare feature to see what is changed over your file.

 

Just note that if you do try out the transmission changes you will have to reset the adaptive learning with the scanner on HP Tuners. After the new tune is flashed in and "before" you start the truck you do this:

 

Flash tune, open VCM scanner, connect to truck, start a new scan, click the special vehicle functions and find the transmission tab. There should be two boxes for the trans adapts that say preset and reset. Click reset first and then preset. Now start the truck. Simple as that, now it will learn the new settings and the first few shifts will be a little clunky but that is normal.

2015 Silverado. test.hpt

Edited by CamGTP
  • Like 3
Alec Kerchner Enthusiast

Alec Kerchner

Posted
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If anyone else is considering this, cold starts now have a VERY extended cranking time. I'm looking into it. I'll update if I figure it out. Otherwise all is good. I made the adjustments from the tune shared above and that shaved another tenth in the quarter mile. The truck just feels nicer to drive. 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Anything under like 45-50 degrees and it does take an extra second or two of cranking time to start. I never messed with it.

  • Like 1
  • 3 weeks later...
TedH Enthusiast

TedH

Posted
Posted (edited)

By accident, I did a search on my Diablo i3 tuner and found it has a 'Flex fuel' tune in addition to the 87, 91 and 93 octane gas tunes.  So, I filled with Ethanol twice (currently, about 65% ethanol per my Diablo sampler) and tuned it for Flex.  I added a slightly firmer shift (trans is too sloppy and I'm always pressing harder to push it along and now happier since the new tune... I still press the go pedal but for better reasons) and ensured the DOD/AFM is OFF.  Overall, no noticeable change other than the better shifting.  But, it is early and I hope to enjoy it regardless.  

 

NOTE:  I'm not concerned with mileage as I am WFH since March 2020 due to the 'lockdown' and my once-weekly 1-hour drive each way (beer and wings with my buds) is my one long trip I get to enjoy listening to the flowmaster Force II exhaust note.

 

I am tuning now for enjoyment.  Also, I am looking seriously at potential for delete of DOD/AFM due to my 70K mileage... a separate thread/topic.

Edited by TedH
Alec Kerchner Enthusiast

Alec Kerchner

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Posted
9 hours ago, TedH said:

By accident, I did a search on my Diablo i3 tuner and found it has a 'Flex fuel' tune in addition to the 87, 91 and 93 octane gas tunes.  So, I filled with Ethanol twice (currently, about 65% ethanol per my Diablo sampler) and tuned it for Flex.  I added a slightly firmer shift (trans is too sloppy and I'm always pressing harder to push it along and now happier since the new tune... I still press the go pedal but for better reasons) and ensured the DOD/AFM is OFF.  Overall, no noticeable change other than the better shifting.  But, it is early and I hope to enjoy it regardless.  

 

NOTE:  I'm not concerned with mileage as I am WFH since March 2020 due to the 'lockdown' and my once-weekly 1-hour drive each way (beer and wings with my buds) is my one long trip I get to enjoy listening to the flowmaster Force II exhaust note.

 

I am tuning now for enjoyment.  Also, I am looking seriously at potential for delete of DOD/AFM due to my 70K mileage... a separate thread/topic.

Interesting you see / feel no real difference. About a week ago I was chatting up a guy in a 2500 while getting e85 and he agreed that his bone stock truck feels like a completely different vehicle when he runs e85!

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
8 hours ago, Alec Kerchner said:

Interesting you see / feel no real difference. About a week ago I was chatting up a guy in a 2500 while getting e85 and he agreed that his bone stock truck feels like a completely different vehicle when he runs e85!

 

I tried E-85 for about a month. Like 10 tanks. The only thing that changed was the fuel economy. But I never asked it to do anything more than I asked of it running 87 E-10. Cost per mile was higher in my area of purchase. No joy there. It started the same. Idled the same. Responded the same to the pedal......zero difference in DTD driving. 

 

I can count on one hand the number of times I've had that truck matted in 150,000 miles. 4% power difference at the crank at WOT and at 5,300 rpm I'm not going to notice in daily driving. 

  • Like 1
MikeBMW Senior Enthusiast

MikeBMW

Posted
Posted

I put a 91 octane tune on my truck via the FashPaq as well as updating my  tire size.
I've got it into a 1 MPH difference from actual speed via GPS.
My mileage from 10 or so is now showing about 12.
Today, I reset one of the trip monitors on a daily drive and got 15.
Sure, 93 Octane costs a lot more, but, with a tune, there is a benefit.
This truck runs better than ever before even on these stupid 35 inch tires! 😺

  • Like 1
  • 2 weeks later...
truckguy82 Senior Enthusiast

truckguy82

Posted
Posted
On 10/16/2021 at 11:43 AM, Grumpy Bear said:

 

I tried E-85 for about a month. Like 10 tanks. The only thing that changed was the fuel economy. But I never asked it to do anything more than I asked of it running 87 E-10. Cost per mile was higher in my area of purchase. No joy there. It started the same. Idled the same. Responded the same to the pedal......zero difference in DTD driving. 

 

I can count on one hand the number of times I've had that truck matted in 150,000 miles. 4% power difference at the crank at WOT and at 5,300 rpm I'm not going to notice in daily driving. 

I’ve never driven a car with e85, they dont offer it in my area.

 

but I would think the e85 changes ignition and fuel timing. I would think that would give you a boost in the low end too. Maybe it only changes the open loop tables? But that doesn’t make that much sense either.

 

hmm

Alec Kerchner Enthusiast

Alec Kerchner

Posted
  • Author
Posted

Yeah, the grunt off the line and throttle response is like driving a different vehicle. It's amazing how different it is just by switching fuels. 

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