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  1. #1
    Join Date
    Feb 2020
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    2

    Default Confusion on RR spring rubbers as night goes on?

    as night goes on I will drop right side bars down 1 hole each.Drop j bar on pinion 1. And if really slick take j bar up 1 on frame Change my shocks adjustments for the slick. Some people say pull RR spring rubbers as it gets slick n some say add in as it slicks off? Adding rubbers will make it a progressive rate which would be good in the slick correct?

  2. #2
    Join Date
    Jul 2009
    Posts
    1,225

    Default

    they are doing other things too, not just rubbers only

  3. #3
    Join Date
    May 2007
    Location
    Batavia, OH
    Posts
    10,967

    Default

    Just as was the case in 1995, your adjustments will need to take track configuration into account, and what the car is doing.

    For example, stiffer lf spring does nothing when that tire doesn't touch the track.
    Droop isn't the problem.

    Arizona Speedway-2. Ohio Valley-1
    East Bay-2. Lawrenceburg-2
    All-Tech-1. Florence-3
    Volusia-1. Portsmouth-3
    Jackson -4. I77 -1
    Mudlick -1
    Moler -2
    Atomic-2

  4. #4
    Join Date
    Oct 2017
    Posts
    940

    Default

    Very dynamic situation their. As masters said track configuration has alot to do with it. But from the sounds of it all your normal adjustments are based around being out of the fuel(decelerating) during turn in. This narrows the window a little bit. Speaking in reference to the rr While adding rubbers increases rate witch technically creates mechanical grip. It also reduces roll which can inturn reduce grip/ sidebite. So it's a bit of a double edge sword. Their really isn't one correct answer especially with the amount of load that has become common in today's setups

  5. #5
    Join Date
    Sep 2020
    Posts
    3

    Default

    Why is it that dirt guys don't use preloaded on RR like on pavement?

  6. #6
    Join Date
    May 2007
    Location
    Batavia, OH
    Posts
    10,967

    Default

    Quote Originally Posted by dirty4life View Post
    Why is it that dirt guys don't use preloaded on RR like on pavement?
    Who says they don't?
    Droop isn't the problem.

    Arizona Speedway-2. Ohio Valley-1
    East Bay-2. Lawrenceburg-2
    All-Tech-1. Florence-3
    Volusia-1. Portsmouth-3
    Jackson -4. I77 -1
    Mudlick -1
    Moler -2
    Atomic-2

  7. #7
    Join Date
    Sep 2020
    Posts
    3

    Default

    just asking because every time I ask people around here, they tell me it won't work. I thought it would make more sense to help control static and dynamic #'s………..

  8. #8
    Join Date
    Oct 2016
    Posts
    23

    Default

    Some guys I know are going to bumps on the RR with a softer Initial rate. For example a 175 with a 75# bump instead of a 225 with a rubber

  9. #9
    Join Date
    May 2007
    Location
    Batavia, OH
    Posts
    10,967

    Default

    Quote Originally Posted by BNaylor91s View Post
    Some guys I know are going to bumps on the RR with a softer Initial rate. For example a 175 with a 75# bump instead of a 225 with a rubber
    There is where a linear bump actually makes sense in my mind. I used to have to remove/add packers on my multi-RSW setup on the 33b car all the time. That rate of a spring would be much more forgiving, but less consistent on dynamic geometry. Keith Masters got me in the ballpark. That yellow 71, with Don driving, was ahead of the game.
    Droop isn't the problem.

    Arizona Speedway-2. Ohio Valley-1
    East Bay-2. Lawrenceburg-2
    All-Tech-1. Florence-3
    Volusia-1. Portsmouth-3
    Jackson -4. I77 -1
    Mudlick -1
    Moler -2
    Atomic-2

  10. #10
    Join Date
    Oct 2017
    Posts
    940

    Default

    Quote Originally Posted by MasterSbilt_Racer View Post
    There is where a linear bump actually makes sense in my mind. I used to have to remove/add packers on my multi-RSW setup on the 33b car all the time. That rate of a spring would be much more forgiving, but less consistent on dynamic geometry. Keith Masters got me in the ballpark. That yellow 71, with Don driving, was ahead of the game.
    It's ashame they've lost their way currently. Hudson proved that he wasn't the problem this weekend

  11. #11
    Join Date
    Jul 2014
    Posts
    377

    Default

    Quote Originally Posted by Zkessler16 View Post
    as night goes on I will drop right side bars down 1 hole each.Drop j bar on pinion 1. And if really slick take j bar up 1 on frame Change my shocks adjustments for the slick. Some people say pull RR spring rubbers as it gets slick n some say add in as it slicks off? Adding rubbers will make it a progressive rate which would be good in the slick correct?
    Usually as you add rubber to RR you decrease Ride Height load. Decent initial rule of thumb, keep RR 1.5 or 2" (from ride height) compressed load the same with the increased spring rate. Looking for same travel, just get there easier and stick RR beyond that travel. Typically we don't move any 4 link or panhard mounting points...ever except RR lower for tight corner/high bank tracks. We Only adjust right side wheel loadings, spring rates (rubber from RF to RR), and RR trail. Also LR extended load. Rear spoiler and stagger too if needed.

  12. #12
    Join Date
    Jan 2012
    Posts
    260

    Default

    I was with a car at the Lucas race at PRP and we discussed the adjustment for the race and the driver said it was right getting in when he took the mega arc. The owner added spring rubbers to the RR, which I questioned it because I would tighten him up. Then he raised the jbar 1/2 inch and lengthened the left side rods and I just knew they would go backwards. They went from 14th to 4th and had a 3rd place car.
    I totally wouldn’t have done it but that’s why I wouldn’t have made the show

  13. #13
    Join Date
    May 2007
    Location
    Batavia, OH
    Posts
    10,967

    Default

    King,

    If I have the car right, he didn't advance at all for the first 18 laps. I'd say tire deteriorating and track came to him.
    Droop isn't the problem.

    Arizona Speedway-2. Ohio Valley-1
    East Bay-2. Lawrenceburg-2
    All-Tech-1. Florence-3
    Volusia-1. Portsmouth-3
    Jackson -4. I77 -1
    Mudlick -1
    Moler -2
    Atomic-2

  14. #14
    Join Date
    Sep 2017
    Posts
    9

    Default

    The other thing to consider in this question is the starting point of the car. I think the main question for the thread is rooted in the idea that the car is right to begin with when the track is heavy. Could be that the car in the situation above was not quite right and they took a swing to fix the handling issues AND adjust for the track all in one swoop, seemingly making very odd adjustments just for the track slicking off. Not saying that this is the case, but something to consider.

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