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Re: Mopar Action article on power steering modification?
[Re: Pacnorthcuda]
#766536
08/17/10 09:43 AM
08/17/10 09:43 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
What is it, some kind of washer to restrict the flow? <snip...>
No its just a washer (of a certain thickness, again I think about .031) to compress the valve/spring assembly in the high pressure line a little more than stock. Simple simple simple.
I just have never tried it or heard from those who have...
Actually, compressing the spring LESS. Target is about 800 PSI. I have now done this on 7 cars with amazingly positive feedback from the owners (plus 2 of my rides and LOTS of pos feedback at the Nats!)
The copper brake-seal washer is a great idea, BTW.
Rick
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Re: Mopar Action article on power steering modification?
[Re: 6T6Cuda]
#766538
08/17/10 10:55 AM
08/17/10 10:55 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Feds are just nonstop hassles, leaks, etc. Plus, most have 200K plus on them now. Same for Thompsons. I am going to e-mail Tom a pdf of the article, it will take him a while to put it up, it will be at MA tech archive Rick
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Re: Mopar Action article on power steering modification?
[Re: rutro]
#766542
09/01/10 05:55 PM
09/01/10 05:55 PM
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Joined: Jan 2003
Posts: 1,236
Chicago, IL
PLUM_72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,236
Chicago, IL
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So who has tried this yet? I pulled the valve out of my Challenger P/S pump and found three .022 shims or total of .066. So do you add another .062 worth of shims as the article suggests to my already .066, or should I try to approximate the .077 stack up like the article had tested? 
1972 Dodge Challenger
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Re: Mopar Action article on power steering modification?
[Re: PLUM_72]
#766543
09/01/10 06:28 PM
09/01/10 06:28 PM
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Joined: Oct 2007
Posts: 3,897
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,897
Oregon
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I pulled the valve out of my trucks pump, and found 2 0.011" shims, for a total of 22.
I ground down a washer that ended up right at 0.077, and put that in.
There's a definite difference while stopped and a little more resistance in the turns. Going straight down the highway may be a little better, but it's still not awesome.
I'm thinking about putting the original shims in for ~0.099".
By adding more shims all you'll do is lower the pressure. I would aim for the 77 to start with (but I wouldn't worry about it being exact). If there's too much resistance, take some back out.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mopar Action article on power steering modification?
[Re: rutro]
#766544
09/02/10 11:53 AM
09/02/10 11:53 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Let me just reiterate a few points...
> I have only tried this on vehicles with Chrysler-built chucks (i.e., "classic" Mopars and older B-vans). I have no idea of the ramifications of doing this on cars with Saginaw chucks (pickups, newer B-vans) but my gut tell me the outcome will be similar. I also dunno about using the reduced pressure with racks.
> Every vehicle I've tried this on (about 9 now) has worked out extremely well with a very noticeable improvement in "road feel". Not magic, but significant. However, if your chuck has 100K, your linkage is sloppy, you have zero caster, and you have 85-series bias-ply tires on 5" wheels @ 22 PSI... ;->
Rick
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Re: Mopar Action article on power steering modification?
[Re: PLUM_72]
#766545
09/04/10 07:33 PM
09/04/10 07:33 PM
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Joined: Jan 2003
Posts: 1,236
Chicago, IL
PLUM_72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,236
Chicago, IL
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Ok update...Had .066 worth of shims stock, added a .020 shim for a total of .086
Is there a difference? Well maybe a slight difference. I was afraid to go more without having gages to see where the pressure went.
It would have been nice for the article to state the shim size in the pump that gave 1400psi. Perhaps there's a relationship that could be calc'd between shims and pressure.
If nothing else it was a good fluid change. I got rid of my ATF/power steering fluid mix that had been in the pump before.
1972 Dodge Challenger
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Re: Mopar Action article on power steering modification?
[Re: PLUM_72]
#766547
09/05/10 09:03 AM
09/05/10 09:03 AM
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Joined: Sep 2003
Posts: 19,480
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,480
north of coder
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Quote:
Ok update...Had .066 worth of shims stock, added a .020 shim for a total of .086
Is there a difference? Well maybe a slight difference. I was afraid to go more without having gages to see where the pressure went.
It would have been nice for the article to state the shim size in the pump that gave 1400psi. Perhaps there's a relationship that could be calc'd between shims and pressure.
If nothing else it was a good fluid change. I got rid of my ATF/power steering fluid mix that had been in the pump before.
on my charger, it had a .050 shim. i upped it to .140[which is .090 added] that made a definate difference. since then, i have made a selection of different sizes of shims, and i will, at some point, add more and see what happens. i sent out a selection of shims to a couple of members for evaluation, but i haven't heard any results so far. for what it's worth, my car only has 18,900 original miles, so it's far from worn out, but i also had a power steering fluid/atf mix, which i have no idea what problems that mix could cause to the box or pump. as to the 1400# pressure, i'm "guessing" the pumps were tested from the factory for that #, and were shimmed accorgingly to arrive at that figure, as the 6 pumps i have done all had different amounts of shimpacks in them.
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