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17' GMC 6.2 Whipple Supercharged Fuel Upgrades Needed to run E85?

Tanner Smith

By Tanner Smith
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Tanner Smith Enthusiast

Tanner Smith

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I got a 2017 GMC Sierra 6.2 with a whipple 2.9L. I want to do E85. I installed the sensor in the fuel line. Do I need to do any other fuel upgrades or does it only need the sensor? I know on the 5.3 it requires upgrades, Im not sure if the 6.2 has a better fuel system than 5.3 or is the same.

JONBLARC7 Enthusiast

JONBLARC7

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Some 5.3's come with the sensor already installed 6.2 do not.  I have the sensor install on my 6.2  There is a good thread on here about how to install it by using an exsisting fuel line and heating it up and bending it.  Then buying a sensor and just extending the harness.  That's what I did.

 

But I say all that to say your probable maxed out on the stock system with just 93.  you'll need and cam with a 32% over fuel lobe, LT4 injectors and some low side support.

Tanner Smith Enthusiast

Tanner Smith

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On 3/12/2021 at 6:08 PM, DenaliX14 said:

Armageddon fuel pump. It does the trick 😉 

Is that an auxiliary pump?

DenaliX14 Enthusiast

DenaliX14

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17 minutes ago, Tanner Smith said:

Is that an auxiliary pump?

It replaces your intake pump (low side). If you want even more flow you can replace your high side pump to a high flow one.


You can get these from GM parts direct or any equivalent site. Search a 2018 Corvette fuel pump. Select any trim that has a supercharger. 
 

a company called wildhammer.com sells a kit for injectors, pump and fuel line. 


goturbo.net has the fuel pump for your tank

Tanner Smith Enthusiast

Tanner Smith

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7 minutes ago, DenaliX14 said:

It replaces your intake pump (low side). If you want even more flow you can replace your high side pump to a high flow one.


You can get these from GM parts direct or any equivalent site. Search a 2018 Corvette fuel pump. Select any trim that has a supercharger. 
 

a company called wildhammer.com sells a kit for injectors, pump and fuel line. 


goturbo.net has the fuel pump for your tank

Okay so injectors would definitely need to be replaced too?

Tanner Smith Enthusiast

Tanner Smith

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1 hour ago, DenaliX14 said:

You run out of fuel with stock injectors around 550-600 hp without a supplemental fuel source like meth or E85. 

Yeah i have a snows performance meth kit on it. But on the dyno my fuel pressure would drop off at the higher rpms. It helped alot with the AFRs though. They were high like 14 and the meth dropped it down to 12.5. But performance wise the meth did not do much unfortunately. 550-600 at crank or rear wheel? I know my fuel system is maxed. Desired fuel pressure was 2500 and it was at 1700 at peak rpm so it drops off. I wonder if i should put a bigger water meth nozzle in? I have a number 4 nozzle in which is 225 ML/Min. I could put a number 6 in it that i have which is 625ML which is quite a jump. So maybe a 5 nozzle at 375ML/Min

DenaliX14 Enthusiast

DenaliX14

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1 hour ago, Tanner Smith said:

Yeah i have a snows performance meth kit on it. But on the dyno my fuel pressure would drop off at the higher rpms. It helped alot with the AFRs though. They were high like 14 and the meth dropped it down to 12.5. But performance wise the meth did not do much unfortunately. 550-600 at crank or rear wheel? I know my fuel system is maxed. Desired fuel pressure was 2500 and it was at 1700 at peak rpm so it drops off. I wonder if i should put a bigger water meth nozzle in? I have a number 4 nozzle in which is 225 ML/Min. I could put a number 6 in it that i have which is 625ML which is quite a jump. So maybe a 5 nozzle at 375ML/Min

Have you done anything to the block? Rods, journals, bearings, or pistons? I wouldn’t be pushing it much past 550 WHP. My first L86 spun 3 rod bearings at the high 500’s. Diamond or Gwatney performance makes a great drop in kit to bulletproof your block to 1000 crank. 
 

that being said, if you want to push the HP you need to upgrade your low, high side pumps, get a 30% fuel lobe camshaft and drop in the LT4 injectors. 

Tanner Smith Enthusiast

Tanner Smith

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3 minutes ago, DenaliX14 said:

Have you done anything to the block? Rods, journals, bearings, or pistons? I wouldn’t be pushing it much past 550 WHP. My first L86 spun 3 rod bearings at the high 500’s. Diamond or Gwatney performance makes a great drop in kit to bulletproof your block to 1000 crank. 
 

that being said, if you want to push the HP you need to upgrade your low, high side pumps, get a 30% fuel lobe camshaft and drop in the LT4 injectors. 

No block has been untouched. I am probably pushing it with where I am at now. Good to know. Ill check them out for future when things break haha. I do need to get Transmission tuning on it. Also trying to figure out of I need the mighty mouse mild or wild catch can.

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