Power steering pulley
07-12-2015, 05:14 AM
#1
Power steering pulley Ok, we all know there is almost no cheap approach to fixing our PS problem...Fuzzy, mentioned our critical rpm stock is 4000rpm before we start to damage the PS pump. If we were to use a 25% UD pulley we then have a critical rpm of 5300rpm, close, but needs a little more for me. I googled the internet and found corvettes PS pump and pulley.
the pulley, pn 12568997, is 6.625 OD and has a groove OD of 6.35, which is bigger than our 6" PS pulley so that may help us slow the pump speed raising the critical rpm to around 7000-8000rpm. At 6.5" PS pulley we will have a critical rpm of well over 8000rpm with a UD. so the 6.35 will be slightly lower
Has anyone experimented with this idea yet?
I thought about using the PS pump as well, but the fittings are slightly different and the price ranges from $150-$250. I am going to try my hand at the scrap yrd and try and score a like new but slightly used PS pump and pulley for less than $100.
Hopefully i may be able to modify the pump to work and i have enough space to fit the new pulley size. This way i can still putt putt around town and still bounce the needle off the rev limiter...
the pulley, pn 12568997, is 6.625 OD and has a groove OD of 6.35, which is bigger than our 6" PS pulley so that may help us slow the pump speed raising the critical rpm to around 7000-8000rpm. At 6.5" PS pulley we will have a critical rpm of well over 8000rpm with a UD. so the 6.35 will be slightly lower
Has anyone experimented with this idea yet?
I thought about using the PS pump as well, but the fittings are slightly different and the price ranges from $150-$250. I am going to try my hand at the scrap yrd and try and score a like new but slightly used PS pump and pulley for less than $100.
Hopefully i may be able to modify the pump to work and i have enough space to fit the new pulley size. This way i can still putt putt around town and still bounce the needle off the rev limiter...
Last edited by Naf; 07-12-2015 at 05:24 AM.
07-12-2015, 08:18 AM
#2
What you haven't mentioned is how you think this change in pump speed would affect steering effort. It would be interesting to know how similar the vette rack and hydraulics are to the V1s. We're the vette hose fittings bigger or smaller than the v1s?
07-12-2015, 10:06 AM
#3
Power steering pulley
Originally Posted by ls1247
What you haven't mentioned is how you think this change in pump speed would affect steering effort. It would be interesting to know how similar the vette rack and hydraulics are to the V1s. We're the vette hose fittings bigger or smaller than the v1s?
Scored this info from another thread
Corvette LS1, LS6, LS2, LS7,(and I think supercharged LS9):
2.4/2.8 GPM 1250/1350
Cadillac CTS-V, all years with LS6 and LS2:
1.9-2.1 GPM 1640/1740 psi
I think this is the shallow depth?:
2009+ CTS-V from LSA motor:
2.7 GPM, 1625/1850
So seein this, i will have to dig up more information about the ps from the new V
Last edited by Naf; 07-12-2015 at 10:15 AM.
07-14-2015, 11:18 AM
#4
TECH Enthusiast
Ok, we all know there is almost no cheap approach to fixing our PS problem...Fuzzy, mentioned our critical rpm stock is 4000rpm before we start to damage the PS pump. If we were to use a 25% UD pulley we then have a critical rpm of 5300rpm, close, but needs a little more for me. I googled the internet and found corvettes PS pump and pulley.
the pulley, pn 12568997, is 6.625 OD and has a groove OD of 6.35, which is bigger than our 6" PS pulley so that may help us slow the pump speed raising the critical rpm to around 7000-8000rpm. At 6.5" PS pulley we will have a critical rpm of well over 8000rpm with a UD. so the 6.35 will be slightly lower
Has anyone experimented with this idea yet?
I thought about using the PS pump as well, but the fittings are slightly different and the price ranges from $150-$250. I am going to try my hand at the scrap yrd and try and score a like new but slightly used PS pump and pulley for less than $100.
Hopefully i may be able to modify the pump to work and i have enough space to fit the new pulley size. This way i can still putt putt around town and still bounce the needle off the rev limiter...
the pulley, pn 12568997, is 6.625 OD and has a groove OD of 6.35, which is bigger than our 6" PS pulley so that may help us slow the pump speed raising the critical rpm to around 7000-8000rpm. At 6.5" PS pulley we will have a critical rpm of well over 8000rpm with a UD. so the 6.35 will be slightly lower
Has anyone experimented with this idea yet?
I thought about using the PS pump as well, but the fittings are slightly different and the price ranges from $150-$250. I am going to try my hand at the scrap yrd and try and score a like new but slightly used PS pump and pulley for less than $100.
Hopefully i may be able to modify the pump to work and i have enough space to fit the new pulley size. This way i can still putt putt around town and still bounce the needle off the rev limiter...
I like the variable low speed/high speed efforts that our pump delivers. I haven't heard of any major issues with it other than people having unchecked leaks and running the pump dry resulting in damage. Or potentially overheating it from extended track usage, which all it takes to fix that is installing a bigger cooler in the hydraulic circuit.
I know you have very wide wheels/tires compared to stock so you may want to get a bigger pump in general if you want to keep the efforts the same as stock. Going to a bigger pulley will just increase efforts all around as it will provide less assist.
07-14-2015, 11:40 AM
#5
Power steering pulley I am saving the pump as it has a critical rpm of 4000rpm stock.
If i am goin to rev my engine high all the time on the track it isnt good for the ps pump.
I have a four pass cooler and i also retained the stock cooler for more coolin power.
Puttin a larger pulley will give me more revs and using a bigger ps pump will retain ease of steerin.
If i am goin to rev my engine high all the time on the track it isnt good for the ps pump.
I have a four pass cooler and i also retained the stock cooler for more coolin power.
Puttin a larger pulley will give me more revs and using a bigger ps pump will retain ease of steerin.
07-15-2015, 12:59 AM
#7
the proper ppl to contact are http://www.krcpower.com/, but this is a $150 upgrade vs a $400-$800 upgrade....
Why not take from those who are already ahead of us...
Why not take from those who are already ahead of us...
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07-15-2015, 06:55 AM
#8
the proper ppl to contact are http://www.krcpower.com/, but this is a $150 upgrade vs a $400-$800 upgrade....
Why not take from those who are already ahead of us...
Why not take from those who are already ahead of us...
It looks like the v has a low volume high pressure pump versus the vette pump and I would think potentially damaging the rack because of it would make the extra dollars worth it.
What does it take to blow a rack seal? Excessive volume or pressure? I have no idea but you might find out
07-15-2015, 10:11 AM
#10
The layout is somewhat different. But i feel the output should be the same. I have a kenworth 963 super, and the ps pump and pulley are the same as a mack ofb...
Scored this info from another thread
Corvette LS1, LS6, LS2, LS7,(and I think supercharged LS9):
2.4/2.8 GPM 1250/1350
Cadillac CTS-V, all years with LS6 and LS2:
1.9-2.1 GPM 1640/1740 psi
I think this is the shallow depth?:
2009+ CTS-V from LSA motor:
2.7 GPM, 1625/1850
So seein this, i will have to dig up more information about the ps from the new V
Scored this info from another thread
Corvette LS1, LS6, LS2, LS7,(and I think supercharged LS9):
2.4/2.8 GPM 1250/1350
Cadillac CTS-V, all years with LS6 and LS2:
1.9-2.1 GPM 1640/1740 psi
I think this is the shallow depth?:
2009+ CTS-V from LSA motor:
2.7 GPM, 1625/1850
So seein this, i will have to dig up more information about the ps from the new V
Wonder if the vette steering lines are the same size as the V1s?
07-15-2015, 04:08 PM
#13
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With that said, it's not going to hurt to install a pulley with a larger diameter. I installed a Vette pulley on mine a couple years ago. I don't recall what the difference in diameter is - probably not even 10%.
The steering rack effort and the steering feel are determined by the input valve and T-bar in the rack-and-pinion. Slowing the pump down with a larger pulley might result in a bit less assist at low RPMs (I didn't notice any change), but the pump pretty quickly gets to whatever its desired output pressure is and then beyond that RPM the extra flow is just recircing.
Although it's a Mustang thread, there's some very good discussion here about how power steering systems work - http://www.corner-carvers.com/forums...ad.php?t=14991. In particular see posts 19 & 26. Some very knowledgeable folks in there - Jeff F worked for Ford, swhiteh3 has worked for a variety of race teams all the way up to Sprint Cup, etc etc.
07-29-2015, 01:20 AM
#15
I removed the old PS pump and learnt the new one needs the old bracket to be modified. 2mm clearance is all that is needed.
I also started to upgrade my 7" x 7" x .75" PS cooler for a 15" x 7" x .75" PS oil cooler. This way i gain better cooling efficiency and add a little more fluid to my system.
I will install the new 6.5" PS pulley bleed and give it a try...
I also started to upgrade my 7" x 7" x .75" PS cooler for a 15" x 7" x .75" PS oil cooler. This way i gain better cooling efficiency and add a little more fluid to my system.
I will install the new 6.5" PS pulley bleed and give it a try...
12-02-2015, 11:51 AM
#20
TECH Enthusiast