Update to Jim Mulvey's project - Page 2 - Lateral-g Forums

**Steve Chryssos** · #11 02-23-2006, 03:09 PM

Quote:

Originally Posted by Speedster

Steve -
Is that some kind of vertical shock absorber in the pic, or just a way to adjust the length of the arm ?

I believe that's a shock. There are all kinds of different arrangements and combinations: Rubbers, springs, shocks. A controls forces under braking. B controls accelerative forces.

So back to Jim's car, the Torque Arm is coupled so it controls both braking and accelerative forces (Pinion rotation) The lower links control vertical movement and the J-bar controls lateral movement.

This was a quick, easy, real world mod that fit's within the existing crossmembers. My guess is that the torque arm will work awesome while the J-bar will be replaced at a later time with a longer Panhard bar.

**Steve1968LS2** · #12 02-23-2006, 03:38 PM

Quote:

Originally Posted by streetfytr68

I don't know. I didn't build it. But too short relative to what? And for what application. And compared to what? The Torque Arm suspension replaces a tri-four bar set up. If the torque arm ran all the way to the front of the vehicle it would carry the front wheels thru the eighth mile. I'll have to get Todd to measure it, but pictures can be deceiving. That torque arm is at least two feet long.

I forgot abotu the front wheel specs. I'll ask Todd to pull a wheel and take some measurements.

Well generally I thought you wanted it long.. for example one in a newer Camaro goes way forward to the trans.

Something Katz said about a short bar (relative to the length of the car) having a low anti-squat value.. Anyway, I'm no suspension expert.. was just curious. looks strong as hell..

Here is the one from my old 2000 Camaro:
http://www.z069.us/00/Undercarriage/Torque.jpg

Anyways, I am really diging what they are doing with Jim's car.. gonna be one nice ride!

sinned · #13 02-23-2006, 09:16 PM

That suspension is exactly what Katz was talking about in this months PHR. You can really screw up an otherwise good design by poor execution.

race-rodz · #14 02-23-2006, 11:22 PM

Quote:

Originally Posted by dennis68

That suspension is exactly what Katz was talking about in this months PHR. You can really screw up an otherwise good design by poor execution.

am i gonna have to go buy this months PHR so i can read the article, or would you care to elaborate a lil.

my 65 mustang runs a long coupled T/A to the trans crossmember, similar to the griggs design, but it isnt a driver yet, so i dunno how it works in "real world"

sinned · #15 02-24-2006, 12:01 AM

A coupled T/A of less than 40" or so just begs for intense brake-hop. I'd also like to see the actual numbers for A/S as I am sure based on how the design was executed that they were not measured for or set during installation. I won't even get into the 20" J-bar...what the hell is that doing on a street car? This was very obviously a design put in place by someone who understands very little if anything about suspension design and should be stored as a classic example that just because you can do something (weld in this case) doesn't mean you should.

68protouring454 · #16 02-24-2006, 06:57 AM

lol denny, is this how you really feel, lmao.

**Steve1968LS2** · #17 02-24-2006, 09:44 AM

Is this really the proper forum to critique the suspension choices on a car not even done yet? Maybe a new thread in the suspension area? I just don't want to be responsible for hijacking a thread..

Also, in regards to the J-bar, if you read the post you would see that they are swapping that out for a PHR later on. Didn't mean to start a debate on T/A theory in here..

TravisB · #18 02-24-2006, 10:25 AM

Quote:

Originally Posted by Steve1969LS1

Is this really the proper forum to critique the suspension choices on a car not even done yet? Maybe a new thread in the suspension area? I just don't want to be responsible for hijacking a thread..

Also, in regards to the J-bar, if you read the post you would have seen that they are swapping that out for a PHR later on. Didn't mean to start a debate on T/A theory in here..

I wouldn't call it hijacking steveR, it was an update to the car and we are just discussing what has been done to it....

Seems kinda like wasted labor to put the j bar on...take it back off...put on the panhard bar. Why not just do the PHB the first time?

**Steve Chryssos** · #19 02-24-2006, 10:45 AM

Maybe the design will work fine?

**Steve1968LS2** · #20 02-24-2006, 11:00 AM

Quote:

Originally Posted by TravisB

I wouldn't call it hijacking steveR, it was an update to the car and we are just discussing what has been done to it....

Seems kinda like wasted labor to put the j bar on...take it back off...put on the panhard bar. Why not just do the PHB the first time?

I know.. I just don't want to turn an update thread into a "bag on the suspension thread".. lol

I got the impression that the J-bar was already on the car from the previous owner. I can't imagine that they would put it on knowing that they were going to swap to a PHR later down the line.