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Author Topic:   PULL BAR / TORQUE ARM *LIFT*
jklostermann
Member
posted November 29, 2001 06:03 PM
HOW MUCH LIFT IS TOO MUCH? ALSO WHICH (pullbar/torque link)IS BETTER AT PRODUCING THE MOST LIFT, AND BETTER AT DISTRIBUTING THE TORQUE AT THE REAR TIRES? AND IS IT BAD TO BE PULLING THE FRONT TIRES OFF THE GROUND COMING OUT OF A TURN?


spde
Member
posted November 29, 2001 08:33 PM
I don't know how much lift is to much, but I have a Pierce Built mod with a lift bar, and if the track is dry or wet the left front is off the ground. When the track is really tacky it feels like it will flip over when you jump in the gas. I ran a pull bar on my old car and honestly I dont know how much different it hooks up (the cars were so different). I do know that it hooks up really well. I have only ran the car about 1 1/2 months, so next year I'll know more. I do think that if I was pulling the left off the ground any more than 1'-1 1/2' I would change springs around to keep it under that measurement. I think it upsets the car to much when the left front comes back down on the track. I am also going to add a 2nd shock to the rear end to help slow down the brake torque. I have found that when you get off the gas it can really jerk the car down. The lift bar is for sure way different to drive , I do like it alot though. If you got any more questions write me back and we'll talk. I dont think you'll get many repies because not many mod guys like the lift bars.
good luck. ltr spde


cleatus
Member
posted November 29, 2001 09:59 PM
WELL CLEATUS I'M IN THE SAME BOAT YOU ARE! I JUST BOUGHT A SHAW WITH A LIFT BAR AND HAVE NO IDEA WHAT TO EXPECT. I'VE HEARD TO RUN ANYTHING FROM A 600# SPRING TO A 150#. MAYBE WE CAN SWAP NOTES DURING NEXT SEASON TO SEE WHAT WORKS BEST ON THESE THINGS. IF YOU HAVE ANY WAY TO EMAIL ME SOME PICS I WOULD LIKE TO SEE HOW YOURS LOOKS. JKLOSTERMANN@HOTMAIL.COM


jammin
Administrator
posted November 30, 2001 09:30 AM
Guys...on a lift bar....I run one too.....the length of the bar will determine your starting point of the spring rate. The best way to test it is to watch your travel. On a tacky track you will want a stiffer spring so that traction will come in sooner....you wont have to worry about breaking tires loose. When the feature rolls around you will have to play with it and soften it up a bit to put some give in the suspension so that you can still hook up but not break loose. You can angle in the eliminator and change your rates but running up and down and changing your rates is the best way. I hope this helps some.

jammin


jklostermann
Member
posted November 30, 2001 11:11 AM
JAMMIN,

WHEN PEOPLE TALK ABOUT THE LENGTH OF THE ARM WHAT EXACTLY DO THEY MEAN? THE ARM ON MY CAR IS PRETTY LONG, HOWEVER IT HAS MOUNTING HOLES ALL THE WAY UP AND DOWN IT. DO YOU MEAN MOVING THE SPRING CLOSER OR FARTHER FORM THE REAREND OR SHORTER AND LONGER ARMS ALTOGETHER?

jammin
Administrator
posted November 30, 2001 11:18 AM
The placement of the spring on that arm basically increases or decreases spring rate...if you move the eliminator and spring farther away from the rear end, you just increased the leverage and it will not compress the spring as much(similar to a harder spring rate), if you move it closer you allow it to compress the spring easier which is similar to a lighter spring rate.


wfoondirt
Member
posted November 30, 2001 02:16 PM
the length of the bar also determines the amount of anti-squat. Anti-squat increases with a shorter bar.


Chad
Member
posted November 30, 2001 02:43 PM
I have run a Shaw car with a lift bar with quite a bit of sucess over the past 4 yrs. I found that I needed to move the spring back toward the rear end housing to give me quicker reaction of the traction. Granted, my track is fairly tacky in Calif. I started running the long bar with a 150-175 lbs spring, and had sucess. But, when I moved the spring back 6-12" to gain increased reaction, I had to increase the spring rate to 300-350 lbs. From the prior posts, I have never lifted my tires off the ground, and I can assure you that I have had some pretty stout motors and very good track conditions. Don't expect to do this just with the lift bar, there are some other suspension factors at work to make the car do that. Many feel that it is not desireable for the front tires to come off the track. Good luck. Keep asking questions and I'm sure we will be able to get you close.


cleatus
Member
posted November 30, 2001 08:23 PM
I didn't think that many guys run lift bars on there cars. Thats cool because now I dont feel like a weirdo. So do any of your guys have a spring attached to your chain link? Or what are you all using to help dampen the brake torque? Has anyone tried reverse mounting 90/10 shocks, I mean mounting them on the rearend housing and facing to the rear of the car? With either the shock level or negative angle on it? I saw alot of dw's running them like that this year. I also run my pull bar level to the ground but I'm have that afco bar that you can adjust to keep level. I do run about 8-9 degrees of pinion angle. Also I have about 2"-3" of travel on my pull bar after running the races. I think 6" of travel is to much, I think it would really be slow getting of the corner with that much travel on it. It may work well on a long, long dry slick. If it was me Cleatus I would either more the spring towards the rearend or stiffen the spring a 100 or so. hey guys so who is going to come racing by me in march at the practice? Hope to see ya all there!
ltr spde


jklostermann
Member
posted December 01, 2001 11:49 PM
Cleatus,

ya i tried, i'll resend it later.

anyway i call shaw and they sent me their 97 setup setup sheet. it has the torque arm specs and their basic 97 setup on it. if you want i can fax or email it to you, your choice. if you could, would you email me some pics of your car and how all the suspenion is bolted on. thanks


cleatus
Member
posted December 04, 2001 03:49 PM
36k what do you mean because of the mounting? is there not room in front or just better for the swing arm setup?


cleatus
Member
posted December 09, 2001 06:05 AM
The springs on mine are mounted w/ the lr in the front of the axle and the rr in the rear. The shocks are just the opposite of the springs. Both have some sight angle towards the middle of the chassis.