Will an aftermarket torque arm help with rear body squat on a hard launch. I've been reading in some car mags where you want the body to rise while you plant the rear end downward. The articles talk about how to accomplish this with leaf spring rear suspensions, but say little about torque arm suspensions. I'm assuming a stiffer torque arm will help prevent the pinion walking up the ring gear. Who has experience with the Edelbrock T/A? I'm leaning toward this one and possibly the Yank mount which removes it from the tailshaft.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2xLS1:
<strong>Will an aftermarket torque arm help with rear body squat on a hard launch. I've been reading in some car mags where you want the body to rise while you plant the rear end downward. The articles talk about how to accomplish this with leaf spring rear suspensions, but say little about torque arm suspensions. I'm assuming a stiffer torque arm will help prevent the pinion walking up the ring gear. Who has experience with the Edelbrock T/A? I'm leaning toward this one and possibly the Yank mount which removes it from the tailshaft.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If you want the rear to squat hard for weight transfer, then you need soft springs and shocks in the rear (Eibach drag launch kit). All torque arm does mainly is prevent the rear housing from roating foward/backwards.

Very little help in preventing the pinion walking up the ring gear, if you want to stop that, then you would get a solid bearing spacer installed in place of the crush sleeve.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Use a solid bearing spacer from Drivetrain Direct in place of the stock crush sleeve. It will really help keep the pinion gear from trying to walk up the ring gear, which is a design flaw of these rear ends. Phone: 888-584-4327 EXT. 116. Cost: $21.95. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

 

BTW I have an Edelbrock Torque Arm I got from www.ramchargers.com for $170 + shipping.

<img src="http://members.aol.com/CYOURDDS2//EdelbrockTA.jpg" alt=" - " />

 

If the body squats under acceleration
then, when you hit the tires, you have
a transient lifting which reduces your
downforce and makes it easier to spin.
If the butt rises then you have the
opposite, a transient firmer planting
of tires and better bite.

The opposite holds true for braking,
and cars set up for extreme plant can
have brake hop problems. You really
want to just minimize any rear end
excursion under torque, unless you
have a single-purpose drag car.

This all has to do with the setup of
"instant center" of the 3-link suspension.

Check this out (one of many Google hits,
one of a few that ain't selling something):

http://www.mae.wmich.edu/faculty/hat...e6-EngReac.ppt

 

If you want to reduce squat, get a set of LCA relocation brackets and drop the rear (axle) end of the LCA's as much as possible. That way, as the pinion gear tries to climb the ring gear (and the axle housing tries to rotate as a result), the rear of the body is being pushed away from the axle. The torque arm will take care of lifting the front of the car.

BTW- having the LCA's adjusted like that isn't ideal for handling, but if you're at the digs, it'll help you get out of the hole...

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Midnight F-117A:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2xLS1:
<strong>Will an aftermarket torque arm help with rear body squat on a hard launch. I've been reading in some car mags where you want the body to rise while you plant the rear end downward. The articles talk about how to accomplish this with leaf spring rear suspensions, but say little about torque arm suspensions. I'm assuming a stiffer torque arm will help prevent the pinion walking up the ring gear. Who has experience with the Edelbrock T/A? I'm leaning toward this one and possibly the Yank mount which removes it from the tailshaft.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If you want the rear to squat hard for weight transfer, then you need soft springs and shocks in the rear (Eibach drag launch kit). All torque arm does mainly is prevent the rear housing from roating foward/backwards.

Very little help in preventing the pinion walking up the ring gear, if you want to stop that, then you would get a solid bearing spacer installed in place of the crush sleeve.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Use a solid bearing spacer from Drivetrain Direct in place of the stock crush sleeve. It will really help keep the pinion gear from trying to walk up the ring gear, which is a design flaw of these rear ends. Phone: 888-584-4327 EXT. 116. Cost: $21.95. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"></strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Rear body squat is what I am trying to prevent. Ideally, you want the rear body to rise while you plant the rear end housing down. The pinion trying to walk up the ring gear has nothing to do with the crush collar. It is what causes the rear end housing to rotate in the opposite direction the axles are turning and causes a positive pinion angle. It is why you set a negative pinion angle at rest so on launch, you have a 0 or slightly positive angle under load. It is what slapper bars prevent on a leaf spring rear end. I guess my question is how well will an aftermarker T/A prevent this rotation over a stock T/A?

I might be interested in your Edelbrock T/A if you can do a little better on the price. The sponsors here are selling them for $179 and I believe it includes the poly mount.

 

get the random tech TA.. You can adjust the pinion angle. There's a deal on them at stranoparts. 285

 

To make the rear of the car rise upon launching LCA relocators would help. Not the easiest thing to explain but if you envision the relation of the rearend, LCA, and body with the LCA starting in a upward sloping angle rather than being horizontal you can get a good mental picture as to why this is.

 

I am interested in this also. How do I make the back of my car RISE on launch?

 

Colonel, if I set up my suspension that way will my pinion bearings still see enough gear oil? I don't want the rear axle angle so radical that my pinion bearing doesn't get any oil.

 

LCA relocators do not change your pinion angle. Your rearend will be at exactly the same angle as before. They simply lower the rear mounting point of the LCAs. The LCAs will be at a steeper angle, nothing else will change.

<small>[ December 13, 2002, 11:22 AM: Message edited by: Colonel ]</small>

 

thanks Colonel, very much appreciated <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

I agree with Colonel. I have the relocator brackets, and my car isn't lowered. The back end does not squat at all on launch. I agree its a little hard to explain. Look at a car that has the brackets, and you will see what I'm talking about.