What about the flexfuel ly5 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70 Suburban · 12-03-2009, 09:07 PM

I have a chance to pick up a 2008 flex fuel ly5 out of a suburban. I was thinking about putting it in my truck. I would like some pics of it or maybe some comments on how to ideas....Long story short.. the sub was wrecked on the 2nd day of owner ship. so there is almost no miles. and its ummm free.... not stolen its a slavage truck...

**Thealien** · 12-03-2009, 10:16 PM

Flex fuel engines have larger injectors and stainless fuel rails both a plus (doesn't really mean anything, people adding cams, heads etc seem to like them?)

The Gen IV engines have DOD (displacement on demand) and VVT (variable valve timing). Most people don't have a problem with this (I bought a 2005 5.3 with 5 miles because I was unsure of those features).

The Gen IV engines also have a separate PCM for the engine and one for the transmission. Not all tuners have the ability to tune the newer PCMs but many do.

For the right price (especially free) I would not hesitate!!

70 Suburban · 12-03-2009, 10:20 PM

I didnt know they had these options. I would like to wire it up im goin to need all the info on this i can get. This does not sound like a standard ls swap

**Thealien** · 12-03-2009, 10:39 PM

As far as a swap goes most is the same as any Gen III or IV engine as far as wiring, fuel, plumbing. There is a wealth of information on this site and quite a few others. I researched for about a month, took a month to buy an engine and I have my old one ready to be pulled as we speak.

There are adapter engine mounts in a few flavors. No fewer than 10 people/companies reworking the harnesses for a 4-5 wire hookup.( from $300 to $800) Battery constant, key on, fuel pump, Tach, speedo (if you want electronic), TCC (torque converter lockup operates oposite of a brake switch, readily available switch). You can also do the harness yourself with help from here and a few websites. You will need at least an external fuel pump with a filter regulator (most use a corvette filter/regulator). That engine will also have DBW (drive by wire), an electric gas pedal which is no problem just make sure you get it and any wiring with it. I don't think they still have a TAC that year (throttle actuated control), a little black box that the pedal plugs into). I think the PCM handles that now. One advantage to DBW is you can now have cruise control with the connection of about 5 wires and a switch!

70 Suburban · 12-03-2009, 10:42 PM

wow thanks. Ill look into it I have done a few standalone setups. but this is to be stock.

70 Suburban · 12-04-2009, 10:28 AM

i DID A SEARCH IT DIDNT COME BACK WELL. dOES ANYONE HERE HAVE A LATE MODEL SWAP.

**Clyde65** · 12-04-2009, 11:21 AM

Check out LS1Truck or LS1Swap.com They can help you also, for the PCM and electrical management, Try Nelson Performance, great people, very helpful.

12-03-2009, 09:07 PM	#1
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	What about the flexfuel ly5 I have a chance to pick up a 2008 flex fuel ly5 out of a suburban. I was thinking about putting it in my truck. I would like some pics of it or maybe some comments on how to ideas....Long story short.. the sub was wrecked on the 2nd day of owner ship. so there is almost no miles. and its ummm free.... not stolen its a slavage truck... __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

12-03-2009, 10:16 PM	#2
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,135	Re: What about the flexfuel ly5 Flex fuel engines have larger injectors and stainless fuel rails both a plus (doesn't really mean anything, people adding cams, heads etc seem to like them?) The Gen IV engines have DOD (displacement on demand) and VVT (variable valve timing). Most people don't have a problem with this (I bought a 2005 5.3 with 5 miles because I was unsure of those features). The Gen IV engines also have a separate PCM for the engine and one for the transmission. Not all tuners have the ability to tune the newer PCMs but many do. For the right price (especially free) I would not hesitate!!

12-03-2009, 10:20 PM	#3
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: What about the flexfuel ly5 I didnt know they had these options. I would like to wire it up im goin to need all the info on this i can get. This does not sound like a standard ls swap __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

12-03-2009, 10:39 PM	#4
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,135	Re: What about the flexfuel ly5 As far as a swap goes most is the same as any Gen III or IV engine as far as wiring, fuel, plumbing. There is a wealth of information on this site and quite a few others. I researched for about a month, took a month to buy an engine and I have my old one ready to be pulled as we speak. There are adapter engine mounts in a few flavors. No fewer than 10 people/companies reworking the harnesses for a 4-5 wire hookup.( from $300 to $800) Battery constant, key on, fuel pump, Tach, speedo (if you want electronic), TCC (torque converter lockup operates oposite of a brake switch, readily available switch). You can also do the harness yourself with help from here and a few websites. You will need at least an external fuel pump with a filter regulator (most use a corvette filter/regulator). That engine will also have DBW (drive by wire), an electric gas pedal which is no problem just make sure you get it and any wiring with it. I don't think they still have a TAC that year (throttle actuated control), a little black box that the pedal plugs into). I think the PCM handles that now. One advantage to DBW is you can now have cruise control with the connection of about 5 wires and a switch! Last edited by Thealien; 12-03-2009 at 10:40 PM.

12-03-2009, 10:42 PM	#5
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: What about the flexfuel ly5 wow thanks. Ill look into it I have done a few standalone setups. but this is to be stock. __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

12-04-2009, 10:28 AM	#6
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: What about the flexfuel ly5 i DID A SEARCH IT DIDNT COME BACK WELL. dOES ANYONE HERE HAVE A LATE MODEL SWAP. __________________ Just keepin it simple. 1965 C-10 Ext cab build. 350??(Does it count at 2 truck if I had to cut one up?) 1966 C-10 lwb 283 auto 1970 Suburban in pieces 1971 Blazer 4wd....restore someday. all factory CST 1972 Blazer 4wd parts truck still a roller 1972 GMC Sierra Grandee 1998 Chevy ext driver. 2005 F**D the wife drive...(cant fix women)

12-04-2009, 11:21 AM	#7
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: What about the flexfuel ly5 Check out LS1Truck or LS1Swap.com They can help you also, for the PCM and electrical management, Try Nelson Performance, great people, very helpful. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

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