Chasing an Issue on the LR/RF

[MachineMasters]

Sounds like there is little to no compression bleed in the shock. I'd verify with the shock builder that the bleed size did not change at all.

4-link rod ends - did you replace them? If the hit was in the rear a rod end (or two or more) may have stretched and is now binding under load.

Measure rear end straightness? Wouldn't explain the Integra fixing the problem but if the rear end was bent badly..

[missile07]

The wreck happened on a restart...leader brake checked we were second and the third place car ran up under him & picked his rearend up off the track. Finished the race with the bent shaft.

We decided over the weekend that we will are going to take rearend out of the car and make absolutely sure there isn't a bent axle tube, etc.

I should have more info in the morning.

[dirtrace09]

With the rearend out check all the heims, birdcages and the rr shock. Don't forget to check the lift arm heims as well. I hope you find the issue. These things can be very frustrating.

[fastford]

The wreck happened on a restart...leader brake checked we were second and the third place car ran up under him & picked his rearend up off the track. Finished the race with the bent shaft.

We decided over the weekend that we will are going to take rearend out of the car and make absolutely sure there isn't a bent axle tube, etc.

I should have more info in the morning.

so you finished the race with the bent shaft ? was it getting up on the bars after the wreck or did it start staying flat right after the wreck ?

[Dirtslinger20]

I’m assuming you’re using a chain as a Limiter.... might sound a lil crazy, but a local guy here fought a similar problem with not getting any hike at all at times.... his chain was catching the axle mount and binding up

[missile07]

Yes he finished the race with the bent shaft (bent down near the rod end) and yes the car would continue to climb the bars...like I said in the original post, if he is on a tacky track the car will hike once it hits traction but will not otherwise & will not leaving the pits, & not at all in the slick.

We are on a chain and we went ahead and checked the motion on it as well.

I can easily lift the LR of the car from ride height to near full travel by picking up on the bumper & I can easily push the nose down on the RF to full travel. But own its own the car cannot lift in the LR. We feel like something is binding once there is a load applied to it.

[MachineMasters]

Rod ends can sometimes rotate free with no load and then bind up with load. If you have a smash machine, put a 4 link rod in and compress to 1500lbs and make sure you can still turn the rod ends by hand.

I'd pull the driveshaft out and make sure the ballspline or slip yoke can move into the transmission with little resistance.

Double check the bearings on the LR shocks.

Ensure the sliders on the LR shock behind aren't binding or catching on the shock body - can look fine on a machine when the shock is straight up and down but when installed can bind from the shock angle.

The static LR load number looks low in my opinion. Raising that up to 600lbs or so should make the LR want to extend easier from ride height, depending on how the stack is setup.. A common LR load at static height would be in the 600-700lb range. I like your extended load range.

[Jking24]

I would definitely look into the drive shaft situation as mentioned. Also you say you have a "triple stack" is it a two spring stack with a take up spring or a true three spring setup. If it is does it have multiple lock outs and are you sure the stack is still operating as it originally was.

[missile07]

A true triple stack (3 separate springs). It has been checked and nothing seems wrong there. Took all 4 4 link rods off and replaced, took 5th coil shock off and replaced & ran torque arm thru the motions and nothing. Going back at it tonight. Pulled axles out to make sure that they come out easy.

Nearly ruled everything out other than brake fluid and lower radiator hose!!!

[fastford]

Yes he finished the race with the bent shaft (bent down near the rod end) and yes the car would continue to climb the bars...like I said in the original post, if he is on a tacky track the car will hike once it hits traction but will not otherwise & will not leaving the pits, & not at all in the slick.

We are on a chain and we went ahead and checked the motion on it as well.

I can easily lift the LR of the car from ride height to near full travel by picking up on the bumper & I can easily push the nose down on the RF to full travel. But own its own the car cannot lift in the LR. We feel like something is binding once there is a load applied to it.

this rules out a lot of thoughts wreck related , now like has been mentioned , if a moving part got damaged , then it might have still worked for the rest of that race and seized up later , IE: a damaged rod end or bird cage bearing could cause this....JMO...

[missile07]

I have had several people private message me and I am very open to any and every option of trying stuff. Several have asked about checking birdcages, rod ends, j-bar, torque arm while it has a load on them? Other than just replacing with new parts how would I go about applying a load and checking these parts?

[Punisher88]

I go back to it works fine with one shock and not the other. Why wouldn't that stuff be binding on the Integra? That in itself removes a bind from being possible. Imo

[missile07]

The day I put the Integra on at the track it had a 125 single spring on it. I smashed it to our extended load number and stuck it on and didn't change anything else. This had the static ride height alot higher than normal, but I didn't have other springs to change it or make a stack. It had the car really really jacked up on the LR corner, so much that the driver had to use a tire to stand on to get in the car....last night we stuck a double stack spring (66 lbs) on the integra and got the extended load correct and static load close. It would not lift it.

With the spring rate being higher(125) and the static ride height already being higher with the combo on at the track, have the car high enough that it was easier to transfer that weight or is the static ride height high enough that it could possibly be past a bind in the suspension?

[phenom08]

Need to actually pull the birdcages off the rear end and feel the bearings by hand. Rocking them back and forth while still installed will lie to you. I found this out the hard way. The race will spin on the tube when there's no weight on it. Also you can put 4 link rods, j bar, etc in your spring smasher. Load to say 600 pounds and see if they move freely. May need to fabricate adaptors

[MasterSbilt_Racer]

The day I put the Integra on at the track it had a 125 single spring on it. I smashed it to our extended load number and stuck it on and didn't change anything else. This had the static ride height alot higher than normal, but I didn't have other springs to change it or make a stack. It had the car really really jacked up on the LR corner, so much that the driver had to use a tire to stand on to get in the car....last night we stuck a double stack spring (66 lbs) on the integra and got the extended load correct and static load close. It would not lift it.

With the spring rate being higher(125) and the static ride height already being higher with the combo on at the track, have the car high enough that it was easier to transfer that weight or is the static ride height high enough that it could possibly be past a bind in the suspension?

You could very well just be getting the trust angle too low as the ride height sags.