Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

2015 6.2 L86 E85 dyno tune numbers


Recommended Posts

Just got my 2015 6.2 Sierra dyno tuned after adding the ethanol sensor, also did 8-speed tuning.  Only mods are Volant intake, home ported throttle body, and E85 conversion with dyno tune, also on heavy Nitto Ridge Grapplers.  380rwhp/435rwtq.  Pretty happy with the numbers.

 

1F27DC95-4C3A-4742-AFFC-7554DDF24B92.jpeg

  • Like 2
Link to comment
Share on other sites

How did you tune the 8 speed?  I thought the TCM was locked.

How much power did you make on premium unleaded?  That would be the only way to know if the E85 mod is beneficial.  

Where I live, the mpg loss from running E85 makes the fuel cost about the same as running premium.  I'd have to make quite a bit more power to justify filling up 30% more often.

I'm asking because I am thinking about some mods for my 2018 6.2L 8-speed.

Link to comment
Share on other sites

37 minutes ago, paracutin said:

How did you tune the 8 speed?  I thought the TCM was locked.

How much power did you make on premium unleaded?  That would be the only way to know if the E85 mod is beneficial.  

Where I live, the mpg loss from running E85 makes the fuel cost about the same as running premium.  I'd have to make quite a bit more power to justify filling up 30% more often.

I'm asking because I am thinking about some mods for my 2018 6.2L 8-speed.

My tuner said that the early 8-speeds are tunable, but the later ones you have to send the TCM off For tuning because they are locked.  I didn’t dyno it before I did the FlexFuel conversion, but bone stock L86 dyno’s that I’ve found tend to be in the 330hp/365tq range.  So the air intake, smoothed throttle body, and E85 tune got roughly 50rwhp/70rwtq.  Which I’ve seen others gain 35-40rwhp/40-50rwtq off just Doing the E85 Swap and tune, so 20hp/tq off intake and throttle body is about right.

Link to comment
Share on other sites

3 hours ago, cstmg8 said:

Which e85 kit did you go with? I think I'm going to start with e85, smaller pulley, throttle body, headers and Dyno tune with tcm.

This will probably have me at about the reliable limit for the tranny.

Does anyone know the limits of the fuel system?

 

 

 

 

I actually just bought a GM sensor, Russell female fuel line connectors and put it in line where the tank soft line connects to the hard line, then extended the sensor plug 18”.  Only $70 worth of parts and no cutting fuel lines.  The 8L90 is rated up to 738ft/lb of torque, which should be around 575 rwtq, so if you’re approaching that with the blower then it may be upgrade build time for the trans?

Link to comment
Share on other sites

44 minutes ago, kgkern01 said:

So now after driving it around a few days the torque difference alone is worth it to convert in my opinion.

Did you have it tuned prior to running e85?

 

my 0-60 went from 5.8 to 5.0 with just a tune, all from low end torque
 

I’m assuming the huge increase you feel is not from the e85 and mostly from the tune

Link to comment
Share on other sites

I actually just bought a GM sensor, Russell female fuel line connectors and put it in line where the tank soft line connects to the hard line, then extended the sensor plug 18”.  Only $70 worth of parts and no cutting fuel lines.  The 8L90 is rated up to 738ft/lb of torque, which should be around 575 rwtq, so if you’re approaching that with the blower then it may be upgrade build time for the trans?
Awesome. Do you happen to have the part numbers or a link? I'm sure I can find it with some googling. This sounds way better than cutting a fuel line.
I'm not sure on the horsepower and torque numbers, Callaway has it listed at 560/553.
I need to get a base dyno done, then a tune. I know they have the tune very safe and super rich.

Sent from my Pixel 3 XL using Tapatalk

Link to comment
Share on other sites

20 minutes ago, truckguy82 said:

Did you have it tuned prior to running e85?

 

my 0-60 went from 5.8 to 5.0 with just a tune, all from low end torque
 

I’m assuming the huge increase you feel is not from the e85 and mostly from the tune

It was not tuned prior to the E85, but with just a base E85 map loaded, the base pull was only down 10rwhp, 12rwtq vs the final pull.  Adjusting AFR and timing further on subsequent pulls didn’t gain anymore than the final numbers.  Plus, even the stock 5.3 is factory rated what 30-35 hp/tq more on E85, with .5 less compression, 0.9L smaller displacement, smaller cam.  So the gains for the 6.2 converting to E85 are not really surprising.  

Edited by kgkern01
Link to comment
Share on other sites

7 minutes ago, kgkern01 said:

It was not tuned prior to the E85, but with just a base E85 map loaded, the base pull was only down 10rwhp, 12rwtq vs the final pull.  Adjusting AFR and timing further on subsequent pulls didn’t gain anymore than the final numbers.  Plus, even the stock 5.3 is factory rated what 30-35 hp/tq more on E85, with .5 less compression, 0.9L smaller displacement, smaller cam.  So the gains for the 6.2 converting to E85 are not really surprising.  

I’m not talking about the hp

 

i’m talking about the torque management.

 

I literally knocked almost a full second off my 0-60 from just a tune , which probably has hardly any hp increase.

 

what you feel on the low end has a lot to do with the oem tuning nannies. I don’t doubt the extra hp feels nice too though.

Link to comment
Share on other sites

5 minutes ago, truckguy82 said:

I’m not talking about the hp

 

i’m talking about the torque management.

 

I literally knocked almost a full second off my 0-60 from just a tune , which probably has hardly any hp increase.

 

what you feel on the low end has a lot to do with the oem tuning nannies. I don’t doubt the extra hp feels nice too though.

True, I’m sure dialing back the torque management in the tune helped quite a bit, but the (estimated) extra 35rwhp/45rwtq from the E85 part of it didn’t hurt lol.

Link to comment
Share on other sites

On 2/25/2020 at 5:03 AM, paracutin said:

How did you tune the 8 speed?  I thought the TCM was locked.

How much power did you make on premium unleaded?  That would be the only way to know if the E85 mod is beneficial.  

Where I live, the mpg loss from running E85 makes the fuel cost about the same as running premium.  I'd have to make quite a bit more power to justify filling up 30% more often.

I'm asking because I am thinking about some mods for my 2018 6.2L 8-speed.

Not sure if this was answered, but it's the 2017 and newer, 8 speed, or 10 speed TCM that is locked, if the vehicle is a 2015 8 speed, that would be tunable. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.