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5.3 flex fuel mods

This is a discussion on 5.3 flex fuel mods within the General Help forums, part of the LSx Technical Help Section category; Im new here so be gentle! Got a 2008 Tahoe and I want to be different but need advise. I ...

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    5.3 flex fuel mods

    Im new here so be gentle! Got a 2008 Tahoe and I want to be different but need advise. I want to cam the motor with stock heads with an intake exhaust and a tune for starters. Can anybody suggest a cam/springs that works well. Has anybody done this or knows of someone who has modded this generation engine. Thanks any help would be appreciated.

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    '02 WS.6 / '07 Suburban

    Welcome to the site!

    We're a friendly bunch here -- go ahead and ask anything and ask often.

    Do you have a DOD engine? The 5.3 is a strong runner - we have an '07 Suburban with a Flex Fuel 5.3 and I use it to haul our enclosed race trailer up and down the hills of Pennsylvania.

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    Quote Originally Posted by pajeff02 View Post
    Welcome to the site!

    We're a friendly bunch here -- go ahead and ask anything and ask often.

    Do you have a DOD engine? The 5.3 is a strong runner - we have an '07 Suburban with a Flex Fuel 5.3 and I use it to haul our enclosed race trailer up and down the hills of Pennsylvania.
    - - - Updated - - -

    Sorry whats DOD?

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    '02 WS.6 / '07 Suburban

    Displacement on Demand -- switches between 8 and 4 cylinders depending upon engine load. The system works by controlling oil to the lifters, effectively shutting down half the engine. Our Suburban has the DOD setup -- my understanding is that to mod the engine this has to be removed and replaced with conventional parts.

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    Quote Originally Posted by pajeff02 View Post
    Displacement on Demand -- switches between 8 and 4 cylinders depending upon engine load. The system works by controlling oil to the lifters, effectively shutting down half the engine. Our Suburban has the DOD setup -- my understanding is that to mod the engine this has to be removed and replaced with conventional parts.

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    Ok understood yes I do have dod. I will look up that procedure. Will I have to also delete the VVT to upgrade cam. After doing these adjustments I assume a change is needed in the cpu to compensate for the changes, correct?

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    Best bet would be to check with an engine builder who is familiar with the necessary upgrades. I know GMHTP has discussed this in more than one article -- here is one that I found with a quick search on their site (for an L99 engine, but the principles are the same): Camshaft Upgrade - Too Fine L99 - GM High-Tech Performance Magazine

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    I have seen articles in Super Chevy also on a 5th gen Camaro. Mast motorsports is a company I see in the magazines. I think you only have to disable the DOD. Remember you are doing a heavy truck. Torque is your friend.

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