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Hydroboost Swap....which pump did you use?

Discussion in 'The Garage' started by dhdescender, Apr 5, 2004.

  1. dhdescender

    dhdescender 1/2 ton status

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    I've swapped in hydroboost recently, and the Chev pump fromt the diesel doesn't match up AT ALL to a caddy block /forums/images/graemlins/angryfire.gif

    I can make a bracket, but its still pretty sketchy. Anyone have any idea if the stock Caddilac pump will be able to keep up with the hydroboost? What if I do the mod's listed on WTO?

    Thanks!

    -Kyle.
     
  2. cegusman

    cegusman 3/4 ton status

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    [ QUOTE ]
    What if I do the mod's listed on WTO?

    [/ QUOTE ] Hydroboost does not like pumps with the mod.
     
  3. 69K5

    69K5 1/2 ton status

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    see if you can find out the pressure on one of those. i forget what the pressure is suposed to be on a hydroboost pump but its highre than normal. alsthough ive seen several people use a normal chevy pump.

    why would it not like the mods?
     
  4. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Because it's not designed for the higher pressure/flow. If you have the mods you will notice a pulsation in the pedal when trying to hold your self on an incline. It will also puslate when getting on the brakes hard. I got around it by running a bone stock pump to the hydroboost and an aftermarket KRC pump to the steering.
     
  5. camiswelding

    camiswelding 1/2 ton status

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    stock caddy pump puts out 750 psi...(Ididnt think it had three ports...does it?) chev hydroboost about 1100... the best way is to adapt the chevy pump by building/modifying the bracket... I did the bracket deal...
    good luck
    cam
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Actually, the flow mod seems to have had no effect on mine. I've had no pulsing problems at all. Slow steering when on the brakes I got, pulsing, haven't noticed it... I'll be using a split system soon (if I can get some projects finished) to aleviate the slow steering problem (I've finally got all the parts).
     
  7. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Did you do flow and pressure mods or just flow mods? I noticed it after doing pressure mods...
     
  8. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Just flow. I have all the power I could want, it's flow I'm hurting on with a 2" ram plus Hydroboost. /forums/images/graemlins/frown.gif
     
  9. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Yeah my 2.25" ram moves as fast as I can turn the wheel, the KRC pumps are where it's at. Then again I have a 1.5" shaft in there... The volume calcs workout to a 1.8" bore ram with 5/8" shaft or something like that.
     
  10. 69K5

    69K5 1/2 ton status

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    i picked up a bracket and pump off an m1008 now i just gotta figure out how to sawp that tp my 350. maybe not the bracket but at least the pump.

    69k5
     
  11. fortcollinsram

    fortcollinsram 1/2 ton status

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    Jason do you have any pics of that KRC pump mounted up? I am very interested in that /forums/images/graemlins/waytogo.gif

    Chris
     
  12. 73k10sub

    73k10sub 1/2 ton status

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    I could not make the brackets off my M1008 work on the small block. I obtained the brackets and pump off a step van ("bread truck", Chevy calls it a P model, I think) with hydro boost and a small block. The pump, unfortunately, was toast but the brackets worked with the M1008 pump after a little bit of grinding. The M1008 pump's reservoir was a bit wider and I had to grind out a slight "V" in the bracket in order to bolt the pump to it.

    I had WTO do the mods to the pump and have noticed no pulsation.

    Ronnie /forums/images/graemlins/truck.gif
     
  13. scoutillac

    scoutillac 1/2 ton status

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    Dumb question: What is WTO? Or what is the web address? /forums/images/graemlins/confused.gif
     
  14. dhdescender

    dhdescender 1/2 ton status

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  15. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Sure thing boss:

    [​IMG]

    The stock pump used to be down where the KRC pump is now.
     
  16. fortcollinsram

    fortcollinsram 1/2 ton status

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    Very cool..so you just mounted the KRC pump to a plate and welded the plate where the old PS pump was? Nice...I may have to do that...I have a KRC pump laying around from another project...I think that may be the hot ticket for the hydraulic assist here this spring /forums/images/graemlins/waytogo.gif

    Chris
     
  17. 69K5

    69K5 1/2 ton status

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    [ QUOTE ]
    I could not make the brackets off my M1008 work on the small block. I obtained the brackets and pump off a step van ("bread truck", Chevy calls it a P model, I think) with hydro boost and a small block. The pump, unfortunately, was toast but the brackets worked with the M1008 pump after a little bit of grinding. The M1008 pump's reservoir was a bit wider and I had to grind out a slight "V" in the bracket in order to bolt the pump to it.

    I had WTO do the mods to the pump and have noticed no pulsation.

    Ronnie /forums/images/graemlins/truck.gif

    [/ QUOTE ]

    thanks for the tip. I hadnt thought about any p vans. I had looked at the m1008 bracket and it didnt look promising so i was looking at modifying the 350 one. ill check it out this weekend. if all else fails ill look for a jy with a bread truck.

    69k5
     
  18. BigRed89

    BigRed89 1/2 ton status

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    Do you know how much pressure and volume the KRC pump puts out?

    Also, does anyone know how much volume a stock hydroboost pump puts out? It was stated earlier that it puts out 1100psi, but I am interested in gal/min. also.
    Thanks
     
  19. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    From discussions I have had with Matt at WTO and Jeff at Howe, the most that can be squeezed from a stock p-pump with just the flow mods and stock internals is about 1.1 gpm. But it's more like .8 or so on average. The KRC unit has a pressure of 1450 psi and the flow is adjustable from 2 gpm to 3.7 gpm. I run the 2.8 gpm valve in mine and it's perfect for my setup. I had the 3.7 gpm valve in it and it was too sensitive. This is with a 2.25" double ended ram.
     
  20. BigRed89

    BigRed89 1/2 ton status

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    [ QUOTE ]
    I had the 3.7 gpm valve in it and it was too sensitive.

    [/ QUOTE ]
    Are you saying that the steering was too sensitive, as in you barely turn the steering wheel and the wheels would react? Also, I may have missed this, but how come you didn't just use the KRC pump exclusively instead of using the stock and KRC pump?
     

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