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Thread: 6.2 ATS turbo questions

  1. #1
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    Default 6.2 ATS turbo questions

    During my search for a 6.2 Redblock, I stumbled across a 6.2 Redblock here in beautiful green Montana that has a full complete ATS turbo kit on it.

    I was wondering if anyone ever had experience with one as they are quite rare and easy to bolt on?

    Any lag issues?
    Peak boost power?
    Egts?
    Over boosting?

  2. #2
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    If the ATS is in good shape and complete it is a great find...
    I have had a few of hose kits pass through my hands over the years.

    They were set up to use the stock air filter assembly IIRC
    They are a decent little "Kick in the BUTT for the anemic 6.2 N/A engine.

    A 1/4 turn on the fuel screw on a stock pump and these were a real improvement...

    Just be sure the cast manifold is in good shape.....The cross over pipe is something that can be made at any good exhaust shop if the original is shot.....

    As long as the turbo does not have a lot of slop in the wheels.
    NO SIGNS of the compressor touching the housing....as in chewing on it.

    These use a bronze bushing with pressure oiling.....

    If this stuff looks good....and the $$$ is agreeable...GRAB IT...Be a good addition to your Red block project.

    Both the ATS and the Banks add on kits did not use a waste gate....They were limited by the size of the turbine .....

    They will push maybe 8-9 psi....Which will wake that 6.2 up quite a bit.....AND KEEP IT ALIVE TOO...
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  3. #3
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    Yes, the intake fits between the stock intake and air filter (uses OEM air filters). The ATS turbine housing is a little smaller than the Banks. The result is a little faster spooling, but it will poop out a little sooner, too (negligible, in most cases). Don't get too crazy on the fuel increase. If it smokes under load, it's re-forging pistons. An EGT gage is HIGHLY recommended. The 6.2L piston crowns aren't anodized, like the 6.5L, so they should be limited to about 150-200F lower EGT.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  4. #4
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    Like Maverick said...."Reforging"
    Yup...I have seen 6.2 pistons melted when some clown tweaked the FUEL SCREW....about 2 turns instead of 1/4 turn extra...

    Rolling coal at full load spooled up ...What Maverick said.....NO NO NO NO....The sign you read along side the road will read....Meltville next right.....

    I can remember my trucking days....That big Cat 3406E 550 HP UNDER THE HOOD....Truck and trailer loaded up to 105,500 lbs....Pulling the 6% outta Pendleton heading to Lagrand...

    The big kitty cat pushing 30+ psi of boost and all ya can smell are the BUGS burning off them 6" stacks........That sweet smell you never forget.....But those stacks are burning clean....NO COAL.....
    EGT around 900F POST TURBO.....

    Computer keeps the Kitty right in the sweet spot......As hard as I tried...never got it to 1000F.....
    I always ran the RPM at around 16-1800....That engine did not feel good at 1200....just not comfy down low....

    My old 3406A 400 hp Pete ran the EGT at 1000-1100 post turbo (Hard pull) and there was always a bit of grey haze out the stacks too.....The E models were real clean....


    A clean burn to a slight haze is perfect on the 6.2......900F post turbo and it will live.....

    Rolling coal and 1200F or more....Not so much....
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    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  5. #5
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    Ok cool! I think it would be a cool old kit to possibly buy. He wants $800 though… it would include the ATS turbo kit, 1 81 cast 6.2 Redblock and a 86 6.2 block. Honestly I think I will wait until I get metallurgy results on the Red. But…..

    An ATS would fit a 6.5 too… hmm

  6. #6
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    The ATS 6.2L kit won't exactly fit a 6.5L. The intake manifolds are different. They are compatible, but will require some massaging. Personally, I wouldn't waste my time with it. There are better, more modern and more effective options. Also available, if you can find them, are the ATS wastegate turbos used for the Ford 6.9L and 7.3L IDI engines. Some folks had success using them on the GM 6.2L. I've seen them in action (at a time when they were still new-ish), and they weren't much impressive. Banks did it right, and ATS was an acceptable second, at the time.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  7. #7
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    $800 is a bit steep UNLESS you know what you are getting......If the 6.2 Red block is rebuildable and not junk....(A must)
    If all you would wind up with is the ATS parts....Not so much.

    What Maverick spoke of is pretty much it... Trying to mix and match a bunch of old school parts that are 40 years old ....only if you like nostalgia....

    Having a little Vintage K5 Blazer 4x4 with an original Red 6.2 and the ATS on it would be a sweet little ride......Just a great piece of nostalgia... and they will still get high 20 mpg's on the road.

    Of all the after market companies....Gale Banks did it right from the gitgo....If you follow his YOU TUBE STUFF..Their dyno setup is definitely top shelf.....Banks takes "tech" to the limit....If he puts his name on it....It is good stuff and it works,

    So much of the early add on goodies were sketchy at best......
    The 6.2 was designed to do one thing.....Get GM CAFE numbers UP
    The 6.2 was a real slug under many conditions..

    The advertising campaigns of the time tried to make the little diesels sound like Gods gift..... Well it was....sort of.....The great mileage was a real plus......A rig like that today would be sweet.....good grocery getter or commuter...

    Run with a feather light throttle these rigs could get close to 30 mpg hwy (3.42 butt gears and the 700R4 Tranny)

    Ah yess.....A stroll down memory lane...
    Last edited by Robyn; 06-25-2022 at 05:26.
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

  8. #8
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    Ok cool. I asked if he would lower his price but he is firm and didn’t sound like he wanted to check for cracks in the webs either. I’ll have to pass on that one.

  9. #9
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    Good call.....
    Could well end up with a nightmare that you can do without.
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2007 Chevy Avalanche
    THIS IS BOW TIE COUNTRY

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