Upgrading fuel system for E85/Flex

[nsogiba]

It's time to start thinking about adding flex capability to my setup since I'm itching for some more power with my dontbsme clone. I'm wondering what will need to be upgraded in my fuel system to support the ethanol...

Gen 3 6.0, all stock other than SS2 cam and springs
Cast VSR 7875, currently running 93 pump and about 13psi/13 degrees

Fuel setup consists of:
-single in-tank Walbro 450
-6AN braided lines (feed/return)
-C5 filter/reg.
-Deka 80# injectors, stock truck fuel rail

I would like to add flex capability...what's required to support this? I'm guessing more injector and another in-tank pump, possibly bigger lines. Not going to run much more boost than what I already am, to keep the bottom end alive. The goal is 600-700 whp, just a fun street car. Thoughts?

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[Rdrnnr]

If your wanting flex make sure you have an e38 ecm and and a flex sensor so you have the tables you can blend back and forth. P59 only has the one fuel map, you'll just have to be on corn or pump and have to flash to change. Otherwise basic fuel upgrades to make sure you've got enough there

 

[Rdrnnr]

Also I would think a 450 and 80s should be pretty close to where you wanna be

 

[nsogiba]

If your wanting flex make sure you have an e38 ecm and and a flex sensor so you have the tables you can blend back and forth. P59 only has the one fuel map, you'll just have to be on corn or pump and have to flash to change. Otherwise basic fuel upgrades to make sure you've got enough there

E38 PCM? Isn't that for Gen IV motors? My connectors aren't even the same as Gen IV stuff. People run Flex on the older Gen III PCMs all the time (it was a factory option for specific trucks, Tahoes etc).

 

[Bob Kazamakis]

Yea my 03 yukon is flex

 

[Rdrnnr]

As long as your setup for it and u have the tables. But I'm pretty sure the older stuff didn't have the tables to blend back and forth. Tahoe yes. But like fbody not to my knowledge. It's been a minute since I cracked anything older open tho so I could be wrong

 

[Lead Pipe]

You have to find a gen 3 flex capable PCM with a drive by cable TB. I don’t know the code but it’s from certain Vans. I also run a squash twin in tank set up.

 

[1quick]

I would think a 450 and 80’s should be close, I ran two 525’s from a hellcat and and 1050’s but I was over 800whp or right around there, twin 255’s wasn’t enough for whatever power level I was at I never dynoed it