2010 Rocket Black Front End Set Up

[gburg006]

Yes, we all know the car does not travel as much as modern cars. My thoughts on these “smash numbers” it seems nobody can guide me on, is setting up a system to keep the car from planting the crossmember in the ground until I get it raised. I figured someone would have some insight to guiding me to do this. I figured a progressive bump set up that leads to a the shock not being able to travel further than X amount would be best. Asphalt late models run springs light enough to just hold the car up, then car rides on bump stops or bump springs. If I only have “3 inches of shock travel” should I not have a system set up so that that it does not travel more than 3” and bottom out the car?

[MasterSbilt_Racer]

Yes, you should. You should remove the spring from your rf shock, jack up the lr until your chain is tight, and find the rf pin to pin measurement where your car is not on the ground.

Then, set your coilover up to hit 2600# at that measurement.

[billetbirdcage]

In a situation like this where you don't know your travel distance before the car hits the ground there for can't know a load number to shoot for, this is what I would do (old school it)

Do as Masterbilt racer said, jack LR and take spring off the RF and just put the shock on there with a bumpstop. Measure the pin to pin measurement with the car (what ever hits first least a 1/2" off the ground) and use that measurement for you max load number. Obviously that number can vary from 1800 to 2600# depending on speed of the track and the cars set up.

Say this measurement is 14" which is say 3.5" of travel, so install a spring (250 is a good start to figure stuff out for now) and a bumpstop. Set your ride load (assume you have already old school scaled car and set ride heights) off what the RF smashed to at that measurement (say 17.5" pins at ride height) then smash spring to 3.5" and set the dynamic load to say 2400# by using shim on top of bumpstop.

Now when you go to the track, monitor RF travel. If you aren't traveling enough start removing shims until you start to feel it bottom out and back up a couple shims. Then pull coilover off and smash to that 14" and see what the number is. Say it's 2200# so use that for your 14" number (hard stop) and now you can change springs or bumps and play with the rest of the numbers and as long as you on a similar track you shouldn't bottom out if you keep the load at 14" around 2200#

Good luck

[Jking24]

In a situation like this where you don't know your travel distance before the car hits the ground there for can't know a load number to shoot for, this is what I would do (old school it)Do as Masterbilt racer said, jack LR and take spring off the RF and just put the shock on there with a bumpstop. Measure the pin to pin measurement with the car (what ever hits first least a 1/2" off the ground) and use that measurement for you max load number. Obviously that number can vary from 1800 to 2600# depending on speed of the track and the cars set up.Say this measurement is 14" which is say 3.5" of travel, so install a spring (250 is a good start to figure stuff out for now) and a bumpstop. Set your ride load (assume you have already old school scaled car and set ride heights) off what the RF smashed to at that measurement (say 17.5" pins at ride height) then smash spring to 3.5" and set the dynamic load to say 2400# by using shim on top of bumpstop.Now when you go to the track, monitor RF travel. If you aren't traveling enough start removing shims until you start to feel it bottom out and back up a couple shims. Then pull coilover off and smash to that 14" and see what the number is. Say it's 2200# so use that for your 14" number (hard stop) and now you can change springs or bumps and play with the rest of the numbers and as long as you on a similar track you shouldn't bottom out if you keep the load at 14" around 2200#Good luck

To add to what masters and billet have said those max load numbers are heavily dependent on the style bump stop you run. Christmas tree or "penske" style as some call it are a little more forgiving but a roller skate wheel or hockey puck is a little easier to dial in when travel limitations are a big factor.