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Tuned and Converted to Flex Fuel (2015 Silverado 5.3L)

Rawyzf
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5.3Nali Enthusiast

5.3Nali

Posted
Posted

Kind of off topic but how much was your mpg affected by the cam swap? I'm assuming that cam has a much larger fuel lobe than stock.

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After all the mods so far I get around 9mpg

Highway mpg about 22-25 not really sure

  • 6 months later...
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Rawyzf
Rawyzf

I'm not even sure where to start with this post, but here goes.   Last week I ordered the Flex Fuel Sensor and fuel lines/hose/clips for the conversion and then dropped the truck off at the Tuner.

SMiller
SMiller

I could care less if it only gained 5hp, just changing the shift points and torque management make it seem like 100hp gain.

Carl T
Carl T

Here you go, this is a 15 GMC 6.2 L86 A8 w/air intake. I was hoping for a stoker but it was as close as I could get.   Stock- 332/383 Tuned - 353/409 picked up 21whp and 26 ft/lbs over stock Tune

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jetlife Enthusiast

jetlife

Posted
Posted

Completed my flex fuel conversion recently. I installed the GM OE sensor and had BB tune it. Install was extremely easy. I started off with a 1/4 to verify operation, and currently have about a 3/4 tank of e85.

 

The truck already feels so much more responsive. E85 combined with BB ecm and tcm5 tune is a perfect combo! Total cost of conversion (not including BB AutoCal) was about $75.

 

Gas mileage is down between 16.5/17, but with e85 at $1.99 and 89oct at $2.35 around me, so it is slightly cheaper to run e85. I would highly recommend it?

  • Like 1
jetlife Enthusiast

jetlife

Posted
Posted

Completed my flex fuel conversion recently. I installed the GM OE sensor and had BB tune it. Install was extremely easy. I started off with a 1/4 to verify operation, and currently have about a 3/4 tank of e85.

 

The truck already feels so much more responsive. E85 combined with BB ecm and tcm tune is a perfect combo! Total cost of conversion (not including BB AutoCal) was about $75.

 

Gas mileage is down between 16.5/17, but with e85 at $1.99 and 89oct at $2.35 around me, so it is slightly cheaper to run e85. I would highly recommend it!

  • 2 months later...
jesse7munoz Enthusiast

jesse7munoz

Posted
Posted

Completed my flex fuel conversion recently. I installed the GM OE sensor and had BB tune it. Install was extremely easy. I started off with a 1/4 to verify operation, and currently have about a 3/4 tank of e85.

 

The truck already feels so much more responsive. E85 combined with BB ecm and tcm tune is a perfect combo! Total cost of conversion (not including BB AutoCal) was about $75.

 

Gas mileage is down between 16.5/17, but with e85 at $1.99 and 89oct at $2.35 around me, so it is slightly cheaper to run e85. I would highly recommend it!

With your conversion, did you only replace the sensor or did you have to convert the fuel lines/hoses as well?

 

I am looking to convert my truck to e85 soon.

16blkslvy New Member

16blkslvy

Posted
Posted

Jesse7, I ordered the conversion kit from Carl and I already had a tune being crafted for the ECM by another vendor when I bought the conversion kit. I believe the conversion kit will have all hardware needed for the conversion (per Carl's site) and then you just need your ECM tuned for the tables to be utilized with the e85.

  • 2 weeks later...
bgweed Enthusiast

bgweed

Posted
Posted

Completed my flex fuel conversion recently. I installed the GM OE sensor and had BB tune it. Install was extremely easy. I started off with a 1/4 to verify operation, and currently have about a 3/4 tank of e85.

 

The truck already feels so much more responsive. E85 combined with BB ecm and tcm tune is a perfect combo! Total cost of conversion (not including BB AutoCal) was about $75.

 

Gas mileage is down between 16.5/17, but with e85 at $1.99 and 89oct at $2.35 around me, so it is slightly cheaper to run e85. I would highly recommend it!

$75? Seems really low when I add up the price of the parts in post #16. Can you clarify what you did?

 

Jesse7, I ordered the conversion kit from Carl and I already had a tune being crafted for the ECM by another vendor when I bought the conversion kit. I believe the conversion kit will have all hardware needed for the conversion (per Carl's site) and then you just need your ECM tuned for the tables to be utilized with the e85.

Carl's kit looks to be the best route, but I'll wait to see what jetlife says above (considerable cost difference).

  • 1 month later...
jesse7munoz Enthusiast

jesse7munoz

Posted
Posted

$75? Seems really low when I add up the price of the parts in post #16. Can you clarify what you did?

 

Carl's kit looks to be the best route, but I'll wait to see what jetlife says above (considerable cost difference).

 

I finally went ahead and got the sensor and will be delivered today. I will be installing the sensor tonight, and if all goes well, tuning tomorrow. Excited to see what the outcome will be! currently I am pushing 340RWHP and I am expecting to see atleast 10-15HP gain.

scott.moody.9401 Enthusiast

scott.moody.9401

Posted
Posted

Damn. Some nice numbers there. So factory numbers look like a 25% drivetrain loss. That sounds like a lot to me. For some reason i was thinking 15% was more like the norm.

15 to 18% is for manual transmissions and 20 - 25% for automatics

 

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smrr1 Senior Enthusiast

smrr1

Posted
Posted

15 to 18% is for manual transmissions and 20 - 25% for automatics

 

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You do realize that my post was almost 2 years ago?
  • Like 1
  • 2 weeks later...
jesse7munoz Enthusiast

jesse7munoz

Posted
Posted

After some issues with the post office losing my package, I finally got the sensor installed, turned on and tuned. Jumped from 340RWHP to 352RWHP. Definitely feel the power increase, I even feel like it shifts smoother than before. After 100 miles of driving, my city MPG went down from 15mpg to 11mpg, but with the price of e85 way lower than 93 octane gas, I feel like I'm saving a lot of money. Install was a breeze, got it done in about 45 minutes - 1 hour. Did not have to change any fuel lines or hoses. I simply cut the fuel lines, attached the sensor with 3/8 couplers, tune, and that's it!

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  • Like 1
RideZX6R Enthusiast

RideZX6R

Posted
Posted

Nice numbers - I saw similar gains on my '17 Camaro with E85.

 

I don't see a need to spend more money on gas on my truck since it's a DD so I'm not going to convert, nice to see the gains are good though

  • Like 1
  • 3 years later...
getto822000 New Member

getto822000

Posted
Posted
On 10/9/2017 at 1:18 PM, RideZX6R said:

Nice numbers - I saw similar gains on my '17 Camaro with E85.

 

I don't see a need to spend more money on gas on my truck since it's a DD so I'm not going to convert, nice to see the gains are good though

I took my 2018 Tahoe to CJ Tunes over a year ago.  Converted it to E85, along with a 6.2L intake manifold and throttle body, as well as AirRad intake tube and air filter.  The end result was amazing.  Never dyno'd it but I would guess maybe about 450/450 crank?  It HAULS BALLS, and has performed flawlessly for 15,000 miles.

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