right rear overdriving

[vms]

The rr seems to want to over run the whole car. That last time i raced it. Plus myself is hard on the throttle on exit. If i lower top left bar would it help

[Matt49]

No, that will make it worse. On a 4-bar car, lower the top RIGHT bar to take drive out of the RR.

[vms]

ok thats what i thought. thank you

[Bcollins82]

Not generally, but.....

If you have too much angle in the LR upper it will drive it up under the car instead of driving it forward. Don't go over 45* at full droop on the LRU. If your not above that angle, lowering it will take away drive, making your problem worse.

[Matt49]

That's a good point bcollins82. You should use something to limit your travel (besides your shocks) to keep the birdcage from over-indexing. We shoot for 45* in the slick, less when it's tacky.

[rubbinsracin]

correct me if im wrong, but on most underslung cars the underslung rail should not allow the bars to go much if at all past 45*? I'm going to measure the angle on mine, but it cant be much past 45* if at all

[mqdirtracer57]

What is the simplist way to check droop?

[racin29]

put a jack under the car right in front of the lr tire and jack it up till the tire is just barely touching the ground then use an angle finder on the top bar

[Bcollins82]

Angle at full droop

I get the car up in the air and level and let the rearend hang fully topped out on both sides, then measure the angle.

[anissa5]

drop

I let the lr hang and jack the right rear up to ride height with out the spring then jack up 2 to 3 in when you do this the lr will index even more then just letting the right rear hang there.

[rubbinsracin]

i did some checking last night with tires and shock and spring off the LR and only a junk 7" shock on the RR (had to limit the RR travel somehow) and by moving the right rear way up until it bottomed out on the shock. beyond where it would travel with a shock/spring on and allowing the left rear to go all the way down to the underslung frame and i could only get right at 47* LU bar angle . this was with the bar all the way up on the frame and all the way down on my birdcage to achieve max angle possible.

in short our underslung will not let us go past the 47* mark, even under extreme circumstances. And 2* is about a 1/4" so if i get past 45* im probably going to be picking the LR up with the frame rail lol

[Bcollins82]

i did some checking last night with tires and shock and spring off the LR and only a junk 7" shock on the RR (had to limit the RR travel somehow) and by moving the right rear way up until it bottomed out on the shock. beyond where it would travel with a shock/spring on and allowing the left rear to go all the way down to the underslung frame and i could only get right at 47* LU bar angle . this was with the bar all the way up on the frame and all the way down on my birdcage to achieve max angle possible.

in short our underslung will not let us go past the 47* mark, even under extreme circumstances. And 2* is about a 1/4" so if i get past 45* im probably going to be picking the LR up with the frame rail lol

So how much can your LR drop in inches from ride height before it hits the underrail? Sounds like it's not going far enough. Measure from the top of the axle to the bottom of the frame, then let it droop and re-measure. Different cars like different amounts, but you should at least be in the 5 or 5 1/2" range.

[rubbinsracin]

you know, i didnt measure the amount of drop in inches. the previous owner had a camera on the LR before and when the car goes around the corner and the car is really up on the bars, it will still leave some room between the tube and the underrail. so i know that im not running out of travel and picking up the LR with the frame rail. i will get under and measure it. but how much drop should an underrail 01 shaw car have?

[Bcollins82]

you know, i didnt measure the amount of drop in inches. the previous owner had a camera on the LR before and when the car goes around the corner and the car is really up on the bars, it will still leave some room between the tube and the underrail. so i know that im not running out of travel and picking up the LR with the frame rail. i will get under and measure it. but how much drop should an underrail 01 shaw car have?

As a general rule it's between 5 and 6 inches from ride height to full droop, and you'll be able to feel a 1/4" adjustment.

[Egoracing]

When the chsssis is rolled over the angle gained on the bars will be more than you can get with it at drop unless you compress the RR to the limit it is on the track and then drop the LR.