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HP diff between Banks turbo and GM?

Discussion in '1982-Present GM Diesel' started by 86dieselburb, Jun 23, 2006.

  1. 86dieselburb

    86dieselburb 1/2 ton status

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    Was reading another thread an I gots to wonderin. Anybody got any figures on HP difference between a Banks turbo as opposed to a GM turbo?

    I got in a bidding war on ebay over a 8 month used Banks kits, and lost. So I ended up bidding, won this time, on a GM-8 turbo, 4911 injection pump and a 6.5 turbo intake manifold. Just wondering if there's a major difference between the turbo set ups. I'm most likely gonna lower the compression to 18:1 and get an adjustable waste gate for the turbo. That should help make some good HP numbers.
     
  2. linksvu

    linksvu Registered Member

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    I do not know for sure, but I would say there is very little difference. I doubt you would notice the difference anyhow on the 6.2 as it is still pretty light-duty.....the exhaust is where I have felt the most difference which is why the Banks comes with an exhaust kit...

    Just do a 3" - 3.5" all the way (no need for a dual) and stick with what you have. Keep the EGT's down!
     
  3. Wishbone

    Wishbone 1/2 ton status

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    I think Borg-Warner makes the GM turbos.
     
  4. azblazor

    azblazor 1/2 ton status Premium Member

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    The maximum boost will be pretty close between a 6.2 Banks turbo and an early GM turbo (1-3)(ie about 92-93). I think the GM 8 turbo will edge the banks. We are still only talking about 10-15 PSI boost. The main difference is that the GM turbo is wastegated, meaning it can be controlled to boost at much lower RPMs. Marginally better for off road applications.
     
  5. azblazor

    azblazor 1/2 ton status Premium Member

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    Also fitment is an issue with AC. The factory exhaust/turbo setup positions the turbo in a way that interfers with the AC evaporator box on the firewall for straight axle chevy trucks. A common fix is to adapt an S-10 AC evaporator box.
     
  6. linksvu

    linksvu Registered Member

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    How is that handled in the Banks kit? I have the banks, and the stock a/c and there is no issue I can find. In fact, they are apart from each other I see no concern....:dunno:
     
  7. azblazor

    azblazor 1/2 ton status Premium Member

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    It isn't an issue with the banks. The banks puts the turbo more forward than the factory turbo does. The GM factory turbo was never designed for the trucks with an AC evaporator in the engine compartment.
     
  8. 86dieselburb

    86dieselburb 1/2 ton status

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    Thanks for the tip on the S-10 a/c box. Never heard that before. My plan was just to go aftermarket A/C, like Vintage Air. The S-10 box would help on the pocket book.
     
  9. 86dieselburb

    86dieselburb 1/2 ton status

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    Wanted to ask. How much fabrication is needed to get the S-10 box to fit?
     
  10. azblazor

    azblazor 1/2 ton status Premium Member

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    I have not done it. I have seen pictures. I have also seen pictures of a stock AC evap box that was "modified" to fit the factory turbo. I have taken both full size and s-10 ac evaporator boxes off before. I just can't remember the details of the duct arrangement or if the blower motor from the S10 would need to be used or not. There are probably guys on "thedieselpage" who have actually done it.
     

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