What torque arm do you run?
Thread Starter
Registered User
Joined: Jul 2000
Posts: 993
From: Three Oaks MI
What torque arm do you run?
Stock
Stock length aftermarket
Stock length w/relocated mount
Shortened like the BMR Trak Pak or Xtreme Duty.
If you went aftermarket, did a shorter one make any difference in ET?
Stock length aftermarket
Stock length w/relocated mount
Shortened like the BMR Trak Pak or Xtreme Duty.
If you went aftermarket, did a shorter one make any difference in ET?
Registered User
Joined: Mar 2000
Posts: 2,037
From: 51°N 114°W, 3500' elevation
Many, many years ago when I had a diff that used a torque arm, I was using a Spohn that attached to the tranny crossmember. This was an early version before the driveshaft loop was offered.
I then went to ladder bars and now have a 4-link under the car. No more torque arm.
I then went to ladder bars and now have a 4-link under the car. No more torque arm.
Registered User
Joined: Jan 2005
Posts: 1,388
From: Moore Oklahoma
Many, many years ago when I had a diff that used a torque arm, I was using a Spohn that attached to the tranny crossmember. This was an early version before the driveshaft loop was offered.
I then went to ladder bars and now have a 4-link under the car. No more torque arm.
I then went to ladder bars and now have a 4-link under the car. No more torque arm.
I bet you're an expert on the instant-center adjustment now! I've see people that had problems getting the 4-link set up initially.
WD
Registered User
Joined: Mar 2000
Posts: 2,037
From: 51°N 114°W, 3500' elevation
Not many choices with ladder bars. 3 height holes on the front mount didn't leave many options. Still better than a torque arm for adjustments. I'm not sure if anyone offers a torque arm with an adjustable position front mount. It would be a good investment if one was offered.
I'm using Performance Trends 4-link software to calculate the IC locations for the 4-link. Lots of choices now. As soon as I get to the track this year, I'll know how good my choice is. I don't have wheelie bars on the car and don't want to put it on the bumper. With the ladder bars I was able to yank the nose heavy front wheels about 6" off the ground launching with a transbrake.
I'm using Performance Trends 4-link software to calculate the IC locations for the 4-link. Lots of choices now. As soon as I get to the track this year, I'll know how good my choice is. I don't have wheelie bars on the car and don't want to put it on the bumper. With the ladder bars I was able to yank the nose heavy front wheels about 6" off the ground launching with a transbrake.
Registered User
Joined: Dec 1998
Posts: 2,161
From: Haslett, Michigan
Ah, the $64,000 question. We haven't seen any definitive proof yet, have we?
FWIW, I went the less-traveled road after experimenting with not one, but two different Spohn torque arm designs. So I'm on my third aftermarket Torque arm. It's a beauty, made by http://www.unbalancedengineering.com
Sporting a short 30-inch (or thereabouts) torque arm, it splits acceleration and braking forces into two separate vectors to optimize both acceleration and braking traction.
This picture shows the torque arm end, and the crossmember onto which it applies the forces.
http://ws6transam.org/Gallery/albums...ipe_final4.jpg
It's not really a drag race per se: It's more for autocross and road race. However it looks strong enough to carry a car into the 8's if necessary. It's adjusted with shims
FWIW, I went the less-traveled road after experimenting with not one, but two different Spohn torque arm designs. So I'm on my third aftermarket Torque arm. It's a beauty, made by http://www.unbalancedengineering.com
Sporting a short 30-inch (or thereabouts) torque arm, it splits acceleration and braking forces into two separate vectors to optimize both acceleration and braking traction.
This picture shows the torque arm end, and the crossmember onto which it applies the forces.
http://ws6transam.org/Gallery/albums...ipe_final4.jpg
It's not really a drag race per se: It's more for autocross and road race. However it looks strong enough to carry a car into the 8's if necessary. It's adjusted with shims
Moderator
Joined: Jul 1998
Posts: 6,247
From: Charlotte,MI USA
Spohn adjustable w/ floor pan mount and dual drive-shaft loops.
As far as documenting a suspension change it could be done but how accurate would it be? You change a torque arm because your car doesn't hook consistantly. After you change it it hooks more consistantly. That's about all you're going to get. You're not goint to log 60's that dead hook and change a suspension part and dead hook and see any difference in your 60. Suspension changes for a drag car are about getting the car to hook better all of the time.
I changed my rear susp. and now it hooks more consistantly.
As far as documenting a suspension change it could be done but how accurate would it be? You change a torque arm because your car doesn't hook consistantly. After you change it it hooks more consistantly. That's about all you're going to get. You're not goint to log 60's that dead hook and change a suspension part and dead hook and see any difference in your 60. Suspension changes for a drag car are about getting the car to hook better all of the time.
I changed my rear susp. and now it hooks more consistantly.