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Old Apr-08-16, 09:30 AM   #1

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Default Flex Fuel Conversion

I just finished a story for Truckin' magazine on converting a stock 2008 AWD TBSS to Flex Fuel. We even ran it on the dyno, and (surprise) it picked up power with 3/4 of a tank of pump E85. I plan on following this up with another test using a boosted combo. Let me know what you guys think and any questions.

How to Convert a Gen IV GM Truck to Flex Fuel for More Power

Sources:
KraftWorks
KraftWorks | Proven Performance

Lingenfelter Performance Engineering
Lingenfelter Performance Engineering

EFI Live
EFILive - Home

Titan Motorsports
Performance Car Parts | Supra | EVO | WRX | Porsche | TitanMotorsports.com
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Old Apr-08-16, 09:36 AM   #2
 
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Old Apr-08-16, 10:24 AM   #3
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Good info. I just started this conversion on my 06 2 weeks ago. Looking forward to trying this out.
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Old Apr-08-16, 11:29 AM   #4

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Unfortunately it is not as easy on the '06, which uses the E40 ECM. If you start a thread, I'd love to see how you make out.
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Old Apr-08-16, 11:38 AM   #5
 
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Unfortunately it is not as easy on the '06, which uses the E40 ECM. If you start a thread, I'd love to see how you make out.
Yes it is. The pin just goes in a different spot on an E40.
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Old Apr-08-16, 11:42 AM   #6

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I wasn't talking about the wiring.
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Old Apr-08-16, 11:53 AM   #7
 
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I wasn't talking about the wiring.
Well what were you talking about? I have done it on both E40 and E67 as well as E38 for that matter.
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Old Apr-08-16, 12:06 PM   #8
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Yes it is. The pin just goes in a different spot on an E40.
This is correct. Matt I'm sure you you have done a few of them.
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Old Apr-08-16, 12:07 PM   #9

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Tuning. Especially when you get into big injectors and boost.
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Old Apr-08-16, 12:09 PM   #10
 
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Tuning. Especially when you get into big injectors and boost.
Tuning is not different then a 07 with an E67. (Same Maf limit, same 8 g/s IFR limit)

If you get into boost at a higher level you have to run an SD Custom OS.

I have quite a few E40 vehicle with larger injectors on E85 out there. Now it isn't as easy as a 2009+ E38 with a 16 g/s limit but sometimes you have to earn your paycheck.

For the purposes of the truck in your article though, it would be exactly the same. I suspect the stock 255 fuel pump would have been ok at the 335whp level as well and only needed an injector change.

I have seen a single 267 pump support well over 600whp N/A on E85 with 60lb @ 3 bar injectors.
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Old Apr-08-16, 12:10 PM   #11
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Tuning. Especially when you get into big injectors and boost.
My application will have big injectors and boost. My tuner has this all figured out. Not a big deal for a guy who tunes and dynos cars for a living.
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Old Apr-08-16, 12:37 PM   #12

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Perhaps I am confusing the early E67 with the later (2012+) version, but I didn't think those had the same injector limit problems as the E40. IMO once you get into that funky injector scaling, it is definitely not something a novice/intermediate level tuner will accomplish (to say nothing of Speed Density and a custom OS).

As for the pump...I went by LPE's recommendations, which wasn't just about the volume but about the materials as well. Plus I like to err on the conservative side. If someone gets away with a stock pump then great, but if not I don't want them blaming me (or the magazine) for thousands of dollars in damage. Not mentioned in the story, we were originally supposed to be installing heads/cam with a higher compression after this. Plans changed, though.
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Old Apr-08-16, 12:49 PM   #13
 
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Perhaps I am confusing the early E67 with the later (2012+) version, but I didn't think those had the same injector limit problems as the E40. IMO once you get into that funky injector scaling, it is definitely not something a novice/intermediate level tuner will accomplish (to say nothing of Speed Density and a custom OS).

As for the pump...I went by LPE's recommendations, which wasn't just about the volume but about the materials as well. Plus I like to err on the conservative side. If someone gets away with a stock pump then great, but if not I don't want them blaming me (or the magazine) for thousands of dollars in damage. Not mentioned in the story, we were originally supposed to be installing heads/cam with a higher compression after this. Plans changed, though.


Yep you are confusing the 09+ E67 found in LSA and LS9 applications with the earlier E67s found in a TBSS. Only the 09 TBSS has the extended IFR range.

I still have to scale the newer E67s when using large injectors like an ID 1300.
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Old Apr-08-16, 12:50 PM   #14

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My application will have big injectors and boost. My tuner has this all figured out. Not a big deal for a guy who tunes and dynos cars for a living.
Sounds like it's going to be a pretty cool truck. 416 with a TVS2300?
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Old Apr-08-16, 12:53 PM   #15

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Quote:
Originally Posted by lt1z View Post
Yep you are confusing the 09+ E67 found in LSA and LS9 applications with the earlier E67s found in a TBSS. Only the 09 TBSS has the extended IFR range.

I still have to scale the newer E67s when using large injectors like an ID 1300.
Ugh. We had to do that on my '05 C6 with just the ID850s. Well, thanks for the info. Good to know.
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Old Apr-08-16, 02:01 PM   #16

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[QUOTE=lt1z;3149289]Yep you are confusing the 09+ E67 found in LSA and LS9 applications with the earlier E67s found in a TBSS. Only the 09 TBSS has the extended IFR range.QUOTE]

I thought I had read 2008 was the last production year, and the '09's were just leftovers?
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Old Apr-08-16, 02:25 PM   #17
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Old Apr-08-16, 03:16 PM   #18
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[QUOTE=SSMinnow;3149385]
Quote:
Originally Posted by lt1z View Post
Yep you are confusing the 09+ E67 found in LSA and LS9 applications with the earlier E67s found in a TBSS. Only the 09 TBSS has the extended IFR range.QUOTE]

I thought I had read 2008 was the last production year, and the '09's were just leftovers?
The 09's have a few different things about them that the other years don't. Just oddball stuff. The trans is one of them.
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Old Apr-09-16, 06:07 AM   #19
 
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Very cool, thanks for sharing. I have am doing the same conversion to my TBSS once it gets back from the body shop. The thing that concerns me is the potential restriction presented by the FlexFuel sensor (it has a "ring" inside) which cannot be good for total flow on the feed side; and I understand this is why most of the time running a return-style system with the sensor there is preferred.

In my case I am splicing the sensor into one of the two fuel rail cross-overs.
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Old May-02-16, 07:42 AM   #20
 
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My Purple Monkey Dishwasher TBSS Build Thread
My Purple Monkey Dishwasher TBSS Build Thread
My Purple Monkey Dishwasher TBSS Build Thread

Done!
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