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2004-2007 Cadillac CTS-V Performance Mods Discussion, steering rack failure in Cadillac CTS-V Series Forum - 2004 - 2007; Originally Posted by ctsv247 I agree with this in normal spirited street operation. While I love it's parking lot manners, ...
  1. #76
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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    I agree with this in normal spirited street operation. While I love it's parking lot manners, fast sweeping on-ramps require a lighter touch than I'm Accustomed to after owing various f-body cars.

    I wonder if a slightly larger pump pulley would slow the assist down without overly compromising low speed handling characteristics and pump capacity issues faced on the track?
    I think Turn One steering has done this with the V2. They lowered the pressure so there is more driver feedback. I find the Cadillac relaxing to drive with the luxury effortless steering. With the mods I have, there is enough feedback to enjoy spirited driving - not nearly the same with my roadster though.

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    Re: steering rack failure

    Quote Originally Posted by FuzzyLogic View Post
    According to one of the experts, the stock power steering pump was not intended to run above 5000-5500 RPM. It's okay for sporadic use at high RPM, but that's about it. Extended high RPM usage (i.e. track conditions) will eventually destroy it.
    So if you could slow the pump down by say 10% or so, could you effectively raise its range of operation on the track while maybe increasing its steering effort just a bit?

    I know it could never be that simple.

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    So if you could slow the pump down by say 10% or so, could you effectively raise its range of operation on the track while maybe increasing its steering effort just a bit? I know it could never be that simple.
    More steering effort by reducing the pressure is exactly what was discussed when I called Turn One. However, they have more experience with the V2 than the V1.

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    Re: steering rack failure

    As is GM tradition, is the v1 style pump used on other GM platforms?

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    So if you could slow the pump down by say 10% or so, could you effectively raise its range of operation on the track while maybe increasing its steering effort just a bit?

    I know it could never be that simple.
    It will not increase its maximum operating RPM. The diameter of the impeller largely determines whether or not cavitation will occur at a given RPM.

  6. #81
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    Re: steering rack failure

    Quote Originally Posted by FuzzyLogic View Post
    It will not increase its maximum operating RPM. The diameter of the impeller largely determines whether or not cavitation will occur at a given RPM.
    So changing the given rpm won't effect the cavitation occurrence for a fixed impeller diameter? If the only fixed component in this equation is impeller diameter, changing one variable (rpm) should change the other variable (cavitation).

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    So changing the given rpm won't effect the cavitation occurrence for a fixed impeller diameter? If the only fixed component in this equation is impeller diameter, changing one variable (rpm) should change the other variable (cavitation).
    You are correct. What I was trying to say was that installing a different sized orfice on the output of the pump will not change its rotational speed (driven by the serpentine belt). Therefore, its cavitation speed will be unaffected.

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    Re: steering rack failure

    What are your thoughts on changing pulley size?

    As a relative novice to the v I'm just getting familiar with the platform so I don't know if there's room for such a change or how common this particular pump is.

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    What are your thoughts on changing pulley size?

    As a relative novice to the v I'm just getting familiar with the platform so I don't know if there's room for such a change or how common this particular pump is.
    The practical problem with trying to increase the maximum RPM by 50% by using a bigger pulley is that you'll end up having to muscle the car around the parking lot.

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    I agree with this in normal spirited street operation. While I love it's parking lot manners, fast sweeping on-ramps require a lighter touch than I'm Accustomed to after owing various f-body cars.

    I wonder if a slightly larger pump pulley would slow the assist down without overly compromising low speed handling characteristics and pump capacity issues faced on the track?
    I might would trade a little parking lot prowess for a little less assist on high speed on-ramps....

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    I might would trade a little parking lot prowess for a little less assist on high speed on-ramps....
    That's where I feel like we're driving totally different cars. You must not have done any of the bushings, or your alignment is out of spec. The only time my V feels squirrely is when I'm braking down hard from 155-165 mph, and that's almost certainly because of my 0.08° of front toe out.

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    Re: steering rack failure

    I've only had it for a couple of months and yes it is 100% bone stock Cadillac rubbery mush. My initial impression is that the steering is a little over assisted but as you're pointing out this could change. I have plans to do an 8.8 with all the bushings and mounts along with a possible Camaro 6060 swap sometime this year so my impressions could change once all that is Done.

    After tons of research, I've found that You have done a lot of cool stuff with the v1 and I have a couple of quick questions for you. If you have the time can I pm you possibly?

    Thanks for your interest!

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    Re: steering rack failure

    Quote Originally Posted by ctsv247 View Post
    I've only had it for a couple of months and yes it is 100% bone stock Cadillac rubbery mush. My initial impression is that the steering is a little over assisted but as you're pointing out this could change. I have plans to do an 8.8 with all the bushings and mounts along with a possible Camaro 6060 swap sometime this year so my impressions could change once all that is Done.

    After tons of research, I've found that You have done a lot of cool stuff with the v1 and I have a couple of quick questions for you. If you have the time can I pm you possibly?

    Thanks for your interest!
    Of course. And by the way, if you haven't done the subframe bushings, the rear end could be kicking out sideways on you during turns when the OEM rubber bushings squash flat. It was first mentioned by neversatisfied on LS1Tech, and the idea eventually gained a lot of traction via a lot of small threads here and there. I was initially skeptical, but did some testing at various speeds and cornering loads and came away convinced.

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    Re: steering rack failure

    ok so the power steering pump pulley doesn't have a bolt - search is over!

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    Re: steering rack failure

    Quote Originally Posted by philistine View Post
    ok so the power steering pump pulley doesn't have a bolt - search is over!
    Come again?

    If you're looking for a little commiseration, my axles came in and Geforce screwed up the inner stubs. So I'm in for another several-week wait. At this point, I'm six weeks overdue to get this thing in the car.

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