2007 and later vortec engines
Thread Starter
Staging Lane
Joined: Mar 2012
Posts: 98
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2007 and later vortec engines Like to ask if anyone has installed a 2007 or later vortec engine with the Fuel Management System? If so, did you leave the FMS in place or is there a way to get around using it? I would like to put a newer vortec in my 72 Chevelle but I am concerned about the FMS. Not sure how it would perform.
Thanks for any information.
Bob
Thanks for any information.
Bob
TECH Regular
Joined: Aug 2008
Posts: 437
Likes: 1
From: Dallas, Ga (2.7 miles from Southeastern Dragway)
active fuel management uses special lifters. You can use it or disable the system. With AFM you are limited on cam specs (primarily Lift), but there are specific aftermarket cams available. If you do away with AFM you can run more cam. Depends on what you want....
Thread Starter
Staging Lane
Joined: Mar 2012
Posts: 98
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Plan on just having a nice cruiser with maybe the addition of headers. I wouldn't mind having the AFM system if it did not alter the idle or hp when I want it. Otherwise I would like to disable it.
Its only active at cruising speeds. My boss has had 2 LSx cars with AFM and hasn't complained a bit about power or throttle response.
If you don't plan on upgrading the camshaft, I'd suggest you keep it (with a slushbox, I don't think the manuals can use it very well).
If you don't plan on upgrading the camshaft, I'd suggest you keep it (with a slushbox, I don't think the manuals can use it very well).
TECH Fanatic
Joined: Jul 2005
Posts: 1,685
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From: Beebe, Arkansas
The AFM really only work on deceleration anyway in the truck motors in stock form. It will run in V4 mode a very low speeds and that's about it. Its more of a gimmick that an actual fuel saver.
You can tune it out and run the motor as is and it will not hurt anything.
Or to delete it you need to remove the heads. Remove the 8 AFM lifters and four lifter trays. Install 8 reg. lifters and four lifter trays. Then remove the AFM valley cover and install the correct non AFM valley cover with the orings under the cover to block the AFM ports. Also you need new head gaskets and head bolts. And tune it out of the ECM still as well.
You can tune it out and run the motor as is and it will not hurt anything.
Or to delete it you need to remove the heads. Remove the 8 AFM lifters and four lifter trays. Install 8 reg. lifters and four lifter trays. Then remove the AFM valley cover and install the correct non AFM valley cover with the orings under the cover to block the AFM ports. Also you need new head gaskets and head bolts. And tune it out of the ECM still as well.
Thread Starter
Staging Lane
Joined: Mar 2012
Posts: 98
Likes: 0
I think I might look for a non AFM system motor. I saw a 6.0 liter in a Hummer for sale. It is probably 4wd so I have to ask if anyone knows if there is any difference in the 6.0 liter (engine only) in a the 4wd Hummer compared to a 6.0 in a 2wd pickup. For my installation I would be using a 4l60e 2wd trans.
TECH Fanatic
Joined: Jul 2005
Posts: 1,685
Likes: 7
From: Beebe, Arkansas
I think I might look for a non AFM system motor. I saw a 6.0 liter in a Hummer for sale. It is probably 4wd so I have to ask if anyone knows if there is any difference in the 6.0 liter (engine only) in a the 4wd Hummer compared to a 6.0 in a 2wd pickup. For my installation I would be using a 4l60e 2wd trans.
