launch analysis - any expert opinions?

[rainmaker]

too much squat? Tire pressure too low? Looks like its bouncing still so I'm thinking a couple more clicks of rebound for sure:

https://youtu.be/ipKboKvd9a4

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[F1scamp]

Front and rear adjustable? Whats the setup? Launch rpm, 60'?
Couple things off the bat... You need to hit that tire harder, rear is squatting too much taking energy away from the tire.
Stiffen rear compression, alot.
More rear tire pressure for sure, looks like it is folding over, once you increase rear compression it will make it worse.

I'm no expert, but have been playing with probably one of the most tire limited classes for quite awhile.

 

[F1scamp]

Also, get slo motion video of front and rear. There are free aps if you are using iphone or android devices.

 

[bluebeastsrt]

Funny but I see things the opposite. I thought the launch looked good for the most part. The front tires stayed on the ground where they belong. rear squat was progressive. No noticeable bounce. I did heat some tire spin. Datails of the run and set up.

 

[rainmaker]

Car will 60' 1.48 - 1.65 range. Need to find 1.33 - 1.43 zone. Vikings Crusader double adjust drag shock with stock PP springs, 28X10-17 Hoosier slicks, and all the BMR hard parts. Front is stock PP. Buddy made the vid, I usually just watch it in HD and change the settings to slow motion in YouTube.

 

[F1scamp]

I tried that also, not slow enough. I use slo-mo app for my Ipad, works pretty well for free. I use Viking shocks on my "race" car, they are a good bang for the buck shock.

Where is your compression settings? What rear springs? When your rear end is squatting 2-3" like that, its actually trying to pick up the rear tire instead of push it into the ground. Tighten the rear compression at least 3 clicks and take another video. You want wrinkle on the side wall, but you don't want folds. Probably will have to add a lbs or two to the slicks.

 

[rainmaker]

Stock PP rear springs, 10 Compression/ 13 Rebound on the Crusaders that day. I usually run 11 - 13 psi cold in the slicks, prob 10-11 psi cold on that pass.

 

[F1scamp]

Probably will end up needing a stiffer rear spring, if it were my car I would try 14c/12r, more than likely 12-13psi cold. You may end up needing more compression than the shock will allow. The rear spring needs to be stiffer most likely. Bmr makes them.

 

[apx632]

What was the launch RPM? Did you try maybe dropping launch RPM down 200-300rpm to see what the car does?

 

[Ranger73]

Front and rear adjustable? Whats the setup? Launch rpm, 60'?
Couple things off the bat... You need to hit that tire harder, rear is squatting too much taking energy away from the tire.
Stiffen rear compression, alot.
More rear tire pressure for sure, looks like it is folding over, once you increase rear compression it will make it worse.

I'm no expert, but have been playing with probably one of the most tire limited classes for quite awhile.

I agree, most people think when the car squats it is applying force to the rear tire but it is the complete opposite. The suspension is eating the force trying to be applied to the tire. If you make the rear of the car stiffer it will hit the tire harder. Unfortunatly we dont get the option to play with anti-squat and instant center that would be a game changer.

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