Lift bar

[MBR Performance]

It's a lot of money to spend on something that may or may not help.

[MBR Performance]

This would have been a great item before the LR behind suspension.

[MittenMadman]

We purchased one at the PRI show and trying it out on a 15' BWRC. All of our race tracks up here are very dry slick(minus I96) and we are just trying to find speed in the slick. If this is the worst money we spend racing I think we would take it haha. Will post some feed back when we get to test it out.

[Kromulous]

Same boat, my brother wants to try one so were gonna weld it in...

Seems like the theory to me is less movement in the front, but more controlled. Damper shock might be in order, like Justaddirt said. We shall find out this coming season.

Question about lift bars in general, the two pick up points on the rear end, should they be in the middle of the track width of the rear end?

Our car last year would never max out travel on the LR, even thou i had massive amount of droop in the pits. Even started limiting the RR droop, it helped but i always fought it to get the LR up all the way. I noticed with the body off in the shop, that the Lift bar was off to the RR tire by about 1 inch. I thought maybe thats the culprit, not sure.

[MasterSbilt_Racer]

Same boat, my brother wants to try one so were gonna weld it in...

Seems like the theory to me is less movement in the front, but more controlled. Damper shock might be in order, like Justaddirt said. We shall find out this coming season.

Question about lift bars in general, the two pick up points on the rear end, should they be in the middle of the track width of the rear end?

Our car last year would never max out travel on the LR, even thou i had massive amount of droop in the pits. Even started limiting the RR droop, it helped but i always fought it to get the LR up all the way. I noticed with the body off in the shop, that the Lift bar was off to the RR tire by about 1 inch. I thought maybe thats the culprit, not sure.

People argue if the lateral location of the lift bar has any effect on the car. It sure does with a pull bar. I don't think you are barking up the right tree, however. It is either a bind, lack of enough lr anti-squat, or some sort of roll center+CG issue.

[TheEngineer]

You should have the lift bar mounted in proportion to the Left Side %, if you run 52% LS, then the lift bar should be attached 52% of the distance from the LR to the RR.

[MasterSbilt_Racer]

If your lift bar only moves the 5th coil shock grommet 1", your forward traction stops there, the more the shock compresses, the harder and faster the car is propelled forward, just because your lift bar is located at 38", doesn't mean your getting all the traction available, propel your race car forward by allowing the lift bar to travel 3 1/2" like they have always told us to.

Your forward traction stops when the tires get shocked loose. Any travel works if the tires stay hooked. You can go really soft, have tons of travel, and no traction.

[MasterSbilt_Racer]

You should have the lift bar mounted in proportion to the Left Side %, if you run 52% LS, then the lift bar should be attached 52% of the distance from the LR to the RR.

Why does that matter?

[TheJet-09]

Didn't GRT try that with their lift bar that went around the driveshaft and mounted to the rearend on the left side? I was taught that the determining factor isn't necessarily where the bar mounts to the rearend, but rather where the spring (5th coil) is in relation to the rearend (side to side)...or laterally I guess. Didn't Rayburn have a short pullbar that mounted to the left side of the rearend, and also connected to the chassis on the left side of the driveshaft? I'm only vaguely familiar with Rayburn's so I apologize if incorrect...

[Kromulous]

MB Racer, what do you mean by LR anti-squat? (Static or overall bar angle?)

I started playing with the rear RC alot, and LS %. The last race of the year i had re-set the car to a 52% LS but we didnt get to run it, so i dont know if thats gonna help it.

This year, i am gonna raise the fuel cell up max, try the low LS % (We were at 53.5% btw), and map the front RC location and make arrangements to change it if needed.

I am interested in this Lift bar location math from the "Engineer" up above, care to expound on that more?

Thanks, Krom.

[MasterSbilt_Racer]

MB Racer, what do you mean by LR anti-squat? (Static or overall bar angle?)

I started playing with the rear RC alot, and LS %. The last race of the year i had re-set the car to a 52% LS but we didnt get to run it, so i dont know if thats gonna help it.

This year, i am gonna raise the fuel cell up max, try the low LS % (We were at 53.5% btw), and map the front RC location and make arrangements to change it if needed.

I am interested in this Lift bar location math from the "Engineer" up above, care to expound on that more?

Thanks, Krom.

By anti squat, I mean everything lifting the rear of the car. The bars, the spring when it is in play, lift from the torque arm, etc.

[CCHIEF]

Lay under your car supported by frame on jackstands, fifth coil shock removed, rr coilover removed. Lr hanging on travel limiter,RR jacked up to simulate dynamic ride height when exiting /cornering Lift and return to static position the lift bar and note what the entire rear axle assembly does! The amount of travel the 5th coil or whatever you bolt there's travel has has a pretty substantial influence on handling/tracking overall dynamically, not just traction to the rear ties from leverage.

[MachineMasters]

Would a solid 5th coil not provide more traction? I understand the drivability argument.. but in theory, wouldn't solid provide the most torque to the rear tires?

Or is the 3.0-3.5" of 5th coil travel that's been mentioned important? I can see the rear end being moved towards the passenger side of the car (which moves the LR tire under the car) due to pinion wrap-up, but is it really that much movement? And does this movement really help with traction?
I see how the LR tire is further in-board and therefore there's more "bite", but the RR tire is not as far inside of the RF tire at that point so wouldn't that free the car up?

[billetbirdcage]

Anyone that has said they have one and are going to do some testing and report back: I urge you that before you just switch a STD T/A vs this devise and say testing done, that you also test a STD T/A with a similar rate on the 5th coil as the bushing before saying one is better then the other.

[billetbirdcage]

Would a solid 5th coil not provide more traction? I understand the drivability argument.. but in theory, wouldn't solid provide the most torque to the rear tires?

It in fact does, unless your a complete throttle stompper

Or is the 3.0-3.5" of 5th coil travel that's been mentioned important? I can see the rear end being moved towards the passenger side of the car (which moves the LR tire under the car) due to pinion wrap-up, but is it really that much movement? And does this movement really help with traction?
I see how the LR tire is further in-board and therefore there's more "bite", but the RR tire is not as far inside of the RF tire at that point so wouldn't that free the car up?

Rear end movement will have and effect on the car