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5.7 ltr to 6.5 turbo diesel

This is a discussion on 5.7 ltr to 6.5 turbo diesel within the Duramax Forum forums, part of the General Discussion category; I'm thinking of switching my 5.7 to a 6.5 turbo diesel other than the fuel tanks, radiator, and torque converter ...

  1. #1
    Registered User rhinotec's Avatar
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    Question 5.7 ltr to 6.5 turbo diesel


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    I'm thinking of switching my 5.7 to a 6.5 turbo diesel other than the fuel tanks, radiator, and torque converter what else would need changing or adjusting?
    '84 & '94 Chevy Silverado 5.7ltr TH-400 & 4l60e I'll modify & drive'em til they fall apart.

  2. #2
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Will you have a donor truck or just putting in the engine?

    Your TH400 will fall apart behind a turbo diesel.
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

  3. #3
    Registered User rhinotec's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by chrisk1500
    Will you have a donor truck or just putting in the engine?

    Your TH400 will fall apart behind a turbo diesel.
    Donor wrecked '93 Hummer H1 Bent Frame 6.5 Turbo in good shape needs new intercooler.
    '84 & '94 Chevy Silverado 5.7ltr TH-400 & 4l60e I'll modify & drive'em til they fall apart.

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    Registered User northface's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    I would say forget the 6.5 and find a good 12v cummins with all the effort you will be going throw by switching motors why go with something the last a long long long time
    Last edited by northface; 08-03-2006 at 11:12 PM.
    05 Duramax crew shorty 6inch rcd lift

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    Registered User red suburban's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    nothing wrong with the 6.5, great on gas mileage and reliable. if you want to make it a power house you would need to put in 18:1 pistons, a turbo from a 95+ cummins or ford 7.3, larger intercooler, and run methanol/propane/nos through it. plus they are MUCH cheaper than a cummins, easier to find, and cheaper parts.

    things you will need from the hummer

    engine

    your th400 would survive, but you would need a new torque converter for it as well as a new hydraulic assembly, go with the 4l80e that should be bolted to the 6.5 already

    the 93 is mechanical injected, so the only computer is the one attached to the tranny, so bring it unless you plan on doing a manual swap or using your th400

    brake booster/master cylinder, as well as the power steering pump. the gm diesels use a hydroboost setup and these two parts are what is linked to it

    fan and fan clutch

    glow plug relay and everything attached to it

    i'm doing a similar swap in my 94 suburban (using a 6.2 with the 6.5 turbo) pretty soon and thats what i've been told you will need.

  6. #6
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by red suburban
    your th400 would survive,



    No it wouldn't.......especially with the mods you listed in your first paragraph.....
    Last edited by chrisk1500; 08-04-2006 at 07:42 AM.
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

  7. #7
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by rhinotec
    Donor wrecked '93 Hummer H1 Bent Frame 6.5 Turbo in good shape needs new intercooler.

    It will take some fabrication to get that intercooler in front of the truck....the 6.5's (especially the early ones) have an overheating problem and sticking more stuff in front of the rad doesn't help....if you are going to go with the stock IC make sure that you do the 97 cooling upgrades to go with it....
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by chrisk1500


    No it wouldn't.......especially with the mods you listed in your first paragraph.....
    ...ive seen turbo 400s behind 500hp+ BB, im sure it has some mods but it survives fine. Ive done alot of reverse to drive slams with mine and it didnt even blink.

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    Registered User red suburban's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by chrisk1500


    No it wouldn't.......especially with the mods you listed in your first paragraph.....
    true, if you mod the engine like i stated in my 1st paragraph the th400 would be mutilated. but with a stock 6.5, i've seen 1 guy put a th400 behind it, and its survived for about 80k miles so far.

  10. #10
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by Back Woods
    ...ive seen turbo 400s behind 500hp+ BB, im sure it has some mods but it survives fine. Ive done alot of reverse to drive slams with mine and it didnt even blink.

    Yeah well....even the 4L60E is a decent trans with mods but we all know how well it holds up in stock situations.....

    I believe the TH400 is a 3 speed trans.....wonder how high it would be reving at highway speeds?.....better off with the 4L80E (same trans but with an overdrive)....
    Last edited by chrisk1500; 08-04-2006 at 04:27 PM.
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

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    Registered User red suburban's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    3rd gear in a th400 is 1:1, same as an sm465, and the 4l80e's 3rd gear, as well as the 700r4/4l60e's 3rd gear. if you kept your speed at 70, had around 3.73 gears and 33" tires your rpms should be somewhere around 2200 rpms, not bad at all.

    the 4l60e/700r4 is a funny tranny, sometimes they live for forever, even being abused. other times, they die within a few thousand miles and you havent even abused it yet. mine has 128,000 miles on it and hasnt given me any problems, but i've been lucky so far with this one.

  12. #12
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    With a 1:1 ratio at 70 MPH with 3.73's and 33 inch tires you would be turning right around 2700 RPM....not 2200 RPMs.....better recalculate that one!


    I've been through 3 60Es in a 4.3 V6 in 300 000 kms.....expensive maintenance item IMO....
    Last edited by chrisk1500; 08-04-2006 at 07:58 PM.
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

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    Re: 5.7 ltr to 6.5 turbo diesel

    whats are the numbers on the 6.5?

  14. #14
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    What numbers are you after? I can find all sorts of numbers under the hood of my truck......
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

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    Re: 5.7 ltr to 6.5 turbo diesel

    hp
    tq

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    Registered User red suburban's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by chrisk1500
    With a 1:1 ratio at 70 MPH with 3.73's and 33 inch tires you would be turning right around 2700 RPM....not 2200 RPMs.....better recalculate that one!


    I've been through 3 60Es in a 4.3 V6 in 300 000 kms.....expensive maintenance item IMO....
    oops, i see where i screwed up on the math. i used my overdrive gear instead, not 1:1.

  17. #17
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Quote Originally Posted by Back Woods
    hp
    tq
    Depends on whether it is an 'S' or an 'F'.....

    S = EGR equipped 'light duty' 6.5 - found in 1500's and light 2500's

    HP = ~180 - 185
    TQ = ~400

    F = non-EGR 'High Output' 6.5 - found in 8 lug 2500's and larger...

    HP = ~195
    TQ = ~430


    These are factory numbers from a factory training manual (except for the S numbers - I am taking those out of my brain....not sure how they got there so they may be off by a tiny bit)...

    S engines are easily converted to a 'near F status' by changing the intake manifold (or plugging EGR) and running an F program in the form of either a chip or a reflash....other thing you would have to change to make it an F engine would be the pre-cups....not worth the effort IMO unless you are going to do a complete rebuild.....
    Last edited by chrisk1500; 08-04-2006 at 08:22 PM.
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

  18. #18
    Registered User red suburban's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    what kind of numbers does a 6.2 put out? (from an 87). and if it has a gm8 turbo on it?

  19. #19
    Registered User chrisk1500's Avatar
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    Re: 5.7 ltr to 6.5 turbo diesel

    Off the top of my head......

    6.2 HP = ~155
    6.2 TQ = ~295 ish

    I am not sure what a GM 8 would do for you but I would assume it would be the same as a Banks kit....

    The Banks kit advertises being able to make the 6.2 produce just over 200 HP and around 385 lb ft of torque.....
    07.5 LMM DMAX 2500 HD, ext cab, 4x4

  20. #20
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    Re: 5.7 ltr to 6.5 turbo diesel

    what would 430tq do to a turbo 400?

 

 
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