Scammper

working on exhaust stuff and I had the rear axle at full droop this afternoon - body is on jack stands... then disconnected the shocks and lowered the axle... The passenger side rim and tire caught on the bump stop. The driver side had a little clearance...
so... my question is does this sound like just a simple panhard adjustment problem? I have the UMI adjustable one... or could it be something else that I am overlooking??

Thanks!

leadfoot4

iTrader: (1)

It's actually a geometry problem. The panhard bar travels in an arc, and as you lowered the axle, it followed the arc defined by the panhard bar. Lowering the axle that much, caused the axle to swing over at least 1.5-2 inches.

In order to determine if you need an adjustable panhard bar to center the axle, the car has to be sitting at ride height, with the suspension in a "normal" compression.

UMI Sales

iTrader: (1)

Hello
Its not a problem! It is just the axle unloading when you took the shocks off. If you are worried about your rear being out of line. Put a string in the middle of the fender (kinda like a plum ball) with a wight at the end and get a measurement from the wheel on each side and that will tell you how far the rear is off and adjust from there.
Hope that helps!
Brad

Scammper

Thanks guys! So Im probably good, when I installed the new panhard I centered it up when the suspension was all on and loaded.

leadfoot, I was trying to think through the arcing deal... wouldnt that push it to the passenger's side? Unless Im mixed up seems like it should be catching on the drivers side as it swings down...

leadfoot4

iTrader: (1)

I would think that the weight of the axle would want to come straight down, with the panhard bar providing some bias to the passenger side, as it travelled in an arc. However, since the bar pivots at both ends, you might get a bit of "skew", and then, since you still had the tires in place, you'd stop whenever one of the tires came in contact with something.

UMI Sales

iTrader: (1)

Glad that I would Help! Just one more thing when you are adjusting the bar make sure the vehicle is unloaded so you are not putting any stress on any parts. If you have any other questions leave me know and I will be help.
Thanks
Brad

Scammper

when you say vehicle unloaded, do you mean nothing extra? I thought the bar was best adjusted with everything hooked up and vehicle sitting on the ground. So the suspension would be "loaded" during adjustment.

Thanks!

BMR Sales2

iTrader: (40)

You are correct. If you unload the suspension and adjust the PHR when you set the car down it will be off due to the arc it swings on. Adjust it at your desired ride height.

UMI Performance

iTrader: (77)

No, We do not recommend this. If the vehicle is sitting on the ground and you adjust the panhard bar you are putting force on the panhard bar mounts and trying to slide the tires across the ground... this is not recommend.

You want to jack up the car and with the rear end hanging free adjust the panhard bar. Set the car back down and take your measurement, if it is still not were you desire jack it back up. Once you get it where you want it tighten the jam nuts and you are good to go.

If you need more help please ask us... we do this all the time

Ryan

BMR Sales2

iTrader: (40)

To the OP, when adjusting your panhard bar with the car on the ground you will be centering the body over the tires, not pulling the tires across the ground.

Danny2tek

iTrader: (1)

Scammper

thanks guys, I got my question answered....
bottomline: you want the centered measurements taken at ride height. Any other measurements dont matter since the axle swings while it travels.

shaun

theres going to be trouble lmao!

jsteele90

iTrader: (13)

BMR VS UMI dumdumdum

UMI Sales

iTrader: (1)

LOL...........

UMI Performance

iTrader: (77)

Again I do not agree and feel this incorrect. You want to move the rear end and center the rear end under the car... not center the body over the rear end. If the vehicles weight is on the ground and you adjust the panhard bar you will be pulling or pushing the body, this will put items in a bind and cause pressure on mounts.


Yes exactly with the vehicle on the ground is when you want to take your final measurements... and sorry for all the un-needed arguments. I guess each company has there way of doing this.

BMR Tech2

iTrader: (5)

[quote=UMI Performance;11234725]. You want to move the rear end and center the rear end under the car... not center the body over the rear end.


Your kidding right?

UMI Performance

iTrader: (77)

No sir...

BMR Sales2

iTrader: (40)

Again it is just two different ways of adjusting it. Same outcome on both.


So this "bind and pressure on mounts" only happens when you are adjusting the PHR? What happens when a 4th gen (or any PHR car for that matter) is pulling close to a G on a skidpad? What will happen to the mounts then?

Another thought......has anyone ever taken the PHR off their car while it is on the ground? Take your hand and put it on the rear quarter panel and give it a push. With no PHR on the car that body will sway left and right a few inches without the bar in the car. I don't see this movment as any sort of "extreme pressures" that are going to give the mounts anywhere near the stress they encounter during hard cornering.

UMI Performance

iTrader: (77)

If the vehicle is sitting on the ground with the suspension fully loaded and you try adjusting the panhard bar- This will try to move the rear end on the ground which it can not do. Since it can not move the rear end it will now pull the body, if you pull the body and tighten the panhard bar this will me continuous stress on the mounts and other mounts of the vehicle putting them in a bind. This is completely different then actually driving the car with pressure...

I just don't agree with this, maybe you do and each to there own... but this won't get us anywhere other then making a mess of the original posters thread....