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Those with PSC hydraulic assist rams...

Zeus33rd

Zeus33rd

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And mostly street driven trucks....Which bore ram did you go with? The GM truck kit that PSC sells comes with the 1.75x8 ram. They also sell a 1.5x8 ram. Would the loss in response with the with the 1.75 ram be worth the gain in power over the 1.5 part? Is there a noticeable difference in street manners between the two? If there's a durability advantage with the 1.75 ram, that's what I want above all. If the smaller rod diameter of the 1.5 ram presents a bending or flexing issue, then that's out. I don't want to deal with leaks or bent rams for the few times my truck will actually see 'trail' time.

This would be going on a fully matched PSC system- box, pump, reservoir and fluid cooler.
 
Joe, the shaft size is the same between the 1.5" and 1.75" bore rams. FWIW i'm running the 1.5"x8" ram on my blazer and haven't had any issues since I installed it a bunch of years ago. While I don't have any personal experience with the 1.75" bore ram on the street everything i've heard is that it is the limiting factor if you need to make a quick turn and even normal driving will limit the movement since it moves slower than the steering box does.
 
KidJethro said:
Just double checked on the PSC website...the 1.5x8 ram has a .625 shaft, the 1.75x8 has a .750 shaft.

1.5x8-
http://www.pscmotorsports.com/motor...assist-cylinders/1-5-x-8-assist-cylinder.html

1.75x8-
http://www.pscmotorsports.com/motor...ssist-cylinders/1-75-x-8-assist-cylinder.html

Unimportant either way.

If you are getting good results with the 1.5x8, then I'd probably be happy with the same. Would the fact that my truck is bigger/heavier have any bearing on going with the 1.75 ram?
Click to expand...

The info on the website is incorrect. I know someone (can't remember who ATM) with the 1.75" ram and that shaft is also .625" diameter.
 
KidJethro said:
If you are getting good results with the 1.5x8, then I'd probably be happy with the same. Would the fact that my truck is bigger/heavier have any bearing on going with the 1.75 ram?
Click to expand...

I would run the 1.5" ram, just for the fact that Scott mentionned, it moves at the same speed as the steering box, the weight of your truck and the size of your tires might give you a different experience but the ram will still be a better match to the steering box.
Now if you are going with a PSC box, and they have the RAM and the BOX matched for a 1.75" then it would be good, but you can only confirm that with PSC, and get it in WRITING :deal:
The 1.75" is normally too big and will need a bigger flow of fluid to keep moving at a fast rate, so if they have a pump with higher flow and matched with a box and the whole setup works good and they are willing to put it in writing I would go with the bigger setup, otherwise from everyone's experience so far, I would stick with the 1.5"
 
imiceman44 said:
I would run the 1.5" ram, just for the fact that Scott mentionned, it moves at the same speed as the steering box, the weight of your truck and the size of your tires might give you a different experience but the ram will still be a better match to the steering box.
Now if you are going with a PSC box, and they have the RAM and the BOX matched for a 1.75" then it would be good, but you can only confirm that with PSC, and get it in WRITING :deal:
The 1.75" is normally too big and will need a bigger flow of fluid to keep moving at a fast rate, so if they have a pump with higher flow and matched with a box and the whole setup works good and they are willing to put it in writing I would go with the bigger setup, otherwise from everyone's experience so far, I would stick with the 1.5"
Click to expand...

I already have the PSC box on my truck, ported and ready to go. I haven't purchased the pump yet. I guess I just need to call them and ask questions.

I've got a hookup to get PSC stuff at cost, otherwise I wouldn't be able to afford all this. Yeeehaa for knowing the right people! :bow:
 
KidJethro said:
I already have the PSC box on my truck, ported and ready to go. I haven't purchased the pump yet. I guess I just need to call them and ask questions.

I've got a hookup to get PSC stuff at cost, otherwise I wouldn't be able to afford all this. Yeeehaa for knowing the right people! :bow:
Click to expand...

Wanna buy a backup set? Hrrrmm hrrrmm:whistle:
 
I would assume ORD's main concern is off road, where a bigger ram can do better off road and quick response is not needed, but I sure would like to hear what they have to say.
Ned Kelly said:
ORD sells the PSC kit with the 1.75" ram. No mention of the 1.5" ram.
http://www.offroaddesign.com/catalog/PSC-Details.htm
Maybe ORD can chime in?...or email them directly and let us know what they say?

I asked ORD to comment....http://coloradok5.com/forums/showthread.php?p=3057092#post3057092
Click to expand...
 
yup, my guess would be if your not trying to shuffle boulders with the tires, the faster ram is the way to go... I know that would be my train of thought for a rig that sees street duty...
 
My 1.5 ram was not lacking power at all even with 42in tires. I never had an issue were i could not turn.
 
Ive got the PSC kit with the 1.75 ram, my rig is not a street rig, trails only. However... i have driven it on the street :whistle:

For street driving it is slow, possible but quite the hassle.

If your rig sees more street time go with the smaller 1.5, more trail time id stick with the 1.75. Either way id imagine that both rams would push some big rubber from one side to the other.

Another note, the single piston rams push faster than they pull. For me turning driver isnt too bad, but when turning passenger ive got to be careful not to overshoot the turn :doah:

just my 2cents

Alex
 
With a PSC pump the 1.75" cylinder is the way to go, with a stock pump it might be slow. It all comes down to what you use the truck for, a bigger cylinder makes more power and is easier on the pump but it can be slower.

We haven't had any issues with turning speed with the PSC pump/reservoir and the 1.75" cylinder, we have one friend/customer that has to make a tight u-turn to park everyday and if he does it fast he can just barely notice the cylinder slowing the system down.

The '99 UA truck gets daily driven occasionally and it has a 2" cylinder and it's not like we never have snow :whistle:

The major key there is the much higher flow of the PSC pump, a stock pump with a 2" cylinder would be terrible.
 
38377k5 said:
With a PSC pump the 1.75" cylinder is the way to go, with a stock pump it might be slow. It all comes down to what you use the truck for, a bigger cylinder makes more power and is easier on the pump but it can be slower.
Click to expand...

So I understand this as.....
A PSC pump with 1.75" ram is good for street duty?
A stock pump with 1.5" ram is good for street duty?
They would both be about equal turning speed?
I ask because I got a complete PSC setup, not installed yet, with 1.75" but now wondering if I should have got a 1.5" ram.
 
4X4HIGH said:
The info on the website is incorrect. I know someone (can't remember who ATM) with the 1.75" ram and that shaft is also .625" diameter.
Click to expand...

I don't know if they sell more than one 1.75" ram but I just measured mine and it has a .75" shaft. :dunno: I got mine about 2-2.5 years ago, maybe they changed them up at some point.

As for street driving the 1.75" ram is a bit slower than it was before I put it on, but with 44's I won't be entering any slalom competitions anyway.
 
I have ran both a 1.5 and 1.75" ram on the street. I didn't notice any real difference between the 2. I ran a modded stock pump on the 1.5 and the 1.75 is all PSC.
 
four_by_ken said:
:doah:
Click to expand...

That statement was in reference to using a 2" hydraulic assist cylinder on top of a steering box, with a stock pump that system is slow and the pump will limit how fast you can steer. With a good aftermarket pump it works well.

I responded to your other post, with a 2" cylinder in a full hydraulic system the flow isn't the problem, it's steering power and there are other potential issues with the steering valve.
 
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