Re: Setting up DA shocks
[Re: FurryStump]
#2818523
09/08/20 12:44 PM
09/08/20 12:44 PM
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Posts: 52,972 Romeo MI
MR_P_BODY
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Not sure why removing the rear leaf spring clamps and gaining more body separation would be a bad thing. Then let the shock do its job of controlling the axle. That use to be the thing to do back before the shocks got much better.. the spring has a couple jobs to do and thats to hold the car up and keep the axle in place.. shocks control the rest (thats breaking down to its simplest form)
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Re: **update w/ video** Setting up DA shocks
[Re: an8sec70cuda]
#2818549
09/08/20 01:51 PM
09/08/20 01:51 PM
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Have you tried more air pressure? In the photo with the shackles is the drivers side almost vertical? As already mentioned if you have to move the top shackle mounts in the frame I'd go ahead and install sliders, it'll be a much easier job.
Not a chassis tuner so take this with a dump truck load of salt. In the videos I see three things, one it appears just as the drivers front tire comes off the track the rear tire unloads. Two, there is almost no movement in the rear, separation or compression. Three, the rear tire needs more air. I'd add some air to the slicks, slow down the rebound in the front and loosen both the compression and rebound in the rear. In that order.
The above and $1.75 will buy you a cup of coffee in some places. I have to agree w/ all of this. It’s worth the try . I won’t have time to make any major changes until winter , then maybe caltracs are in my plan . Only thing is I am out of rebound adjustment in the front . I could have Viking overnight the heavier kit for the front . Where should rear tire pressure be ? Tires are 31.25 12.5 w Car is 3100 or so
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Re: Setting up DA shocks
[Re: FurryStump]
#2818559
09/08/20 01:59 PM
09/08/20 01:59 PM
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Not sure why removing the rear leaf spring clamps and gaining more body separation would be a bad thing. Then let the shock do its job of controlling the axle. I am going for the weekend as well, so if I don’t have a helper in tow I will take you up on it . Either way I will find you . I assumed Cab meant the spring would separate . Maybe he will clarify .
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Re: Setting up DA shocks
[Re: Wirenut]
#2818563
09/08/20 02:08 PM
09/08/20 02:08 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Not sure why removing the rear leaf spring clamps and gaining more body separation would be a bad thing. Then let the shock do its job of controlling the axle. I am going for the weekend as well, so if I don’t have a helper in tow I will take you up on it . Either way I will find you . I assumed Cab meant the spring would separate . Maybe he will clarify . Yes the spring does separate
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Re: Setting up DA shocks
[Re: MR_P_BODY]
#2818575
09/08/20 02:28 PM
09/08/20 02:28 PM
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Not sure why removing the rear leaf spring clamps and gaining more body separation would be a bad thing. Then let the shock do its job of controlling the axle. I am going for the weekend as well, so if I don’t have a helper in tow I will take you up on it . Either way I will find you . I assumed Cab meant the spring would separate . Maybe he will clarify . Yes the spring does separate And does this damage the spring? Or cause a dangerous condition ?
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Re: **update w/ video** Setting up DA shocks
[Re: Wirenut]
#2818578
09/08/20 02:35 PM
09/08/20 02:35 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
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Have you tried more air pressure? In the photo with the shackles is the drivers side almost vertical? As already mentioned if you have to move the top shackle mounts in the frame I'd go ahead and install sliders, it'll be a much easier job.
Not a chassis tuner so take this with a dump truck load of salt. In the videos I see three things, one it appears just as the drivers front tire comes off the track the rear tire unloads. Two, there is almost no movement in the rear, separation or compression. Three, the rear tire needs more air. I'd add some air to the slicks, slow down the rebound in the front and loosen both the compression and rebound in the rear. In that order.
The above and $1.75 will buy you a cup of coffee in some places. I have to agree w/ all of this. It’s worth the try . I won’t have time to make any major changes until winter , then maybe caltracs are in my plan . Only thing is I am out of rebound adjustment in the front . I could have Viking overnight the heavier kit for the front .Where should rear tire pressure be ? Tires are 31.25 12.5 w Car is 3100 or so You need to have your shocks checked out. I had a bad Viking shock on the front of my car and sent them to Afterworks to be fixed and revalved. I've never ran that tire but I'd start upping the pressure until it spins and back it down from there. Do the front shocks first though IMHO.
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Re: Setting up DA shocks
[Re: Wirenut]
#2818598
09/08/20 03:19 PM
09/08/20 03:19 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Yes the spring does separate [/quote] And does this damage the spring? Or cause a dangerous condition ? [/quote] No it doesnt do anything to the spring.. too low of tire pressure is more dangerous when the tire starts to squirm around on top end
Last edited by MR_P_BODY; 09/08/20 03:22 PM.
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Re: Setting up DA shocks
[Re: Wirenut]
#2818705
09/08/20 07:20 PM
09/08/20 07:20 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Ok so we know there is no simple fix .
As has been mentioned, I think a set of rear sliders would make more sense than another set of holes in the frame to correct the shackle angle . There are already two holes on one side and three on the other (who knows why) , so if I go sliders I would like to clean up that area as it wasn’t done very well.
As I said there won’t be time for revamp of the rear suspension until winter .
There are only 2 months of track time left so I think I will play with tire pressure, shocks and maybe even remove the factory spring clamp and use an after market clamp in different positions to see if I can minimize the issue a bit .
Thanks to all , you guys always learn me something . If you have any thoughts on limping it along let me know .
If any of you will be at lvd this weekend, you know what the car looks like now , stop by and say hi .
Furry Stump I will be looking for you . Think of the rear leaf spring like this.. the front of it controls where the axle is and the rear part is just the spring to hold the car up.. the shock controls the rate the rear end moves and how fast.. the angle of the shocks is based on what the car is used for.. a race car the shocks are vertical and a street car they are angled for doing corners.. on my street rod I put them vertical for drag racing with some distance running(I built the car mainly for DW but I latter changed my mind) I didnt see the pic of your car but if the back end is up in the air it just makes it harder to get traction so if you can try to make the car level
Last edited by MR_P_BODY; 09/08/20 07:25 PM.
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Re: Setting up DA shocks
[Re: MR_P_BODY]
#2818720
09/08/20 08:21 PM
09/08/20 08:21 PM
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Joined: May 2016
Posts: 630 Ct
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Ok so we know there is no simple fix .
As has been mentioned, I think a set of rear sliders would make more sense than another set of holes in the frame to correct the shackle angle . There are already two holes on one side and three on the other (who knows why) , so if I go sliders I would like to clean up that area as it wasn’t done very well.
As I said there won’t be time for revamp of the rear suspension until winter .
There are only 2 months of track time left so I think I will play with tire pressure, shocks and maybe even remove the factory spring clamp and use an after market clamp in different positions to see if I can minimize the issue a bit .
Thanks to all , you guys always learn me something . If you have any thoughts on limping it along let me know .
If any of you will be at lvd this weekend, you know what the car looks like now , stop by and say hi .
Furry Stump I will be looking for you . Think of the rear leaf spring like this.. the front of it controls where the axle is and the rear part is just the spring to hold the car up.. the shock controls the rate the rear end moves and how fast.. the angle of the shocks is based on what the car is used for.. a race car the shocks are vertical and a street car they are angled for doing corners.. on my street rod I put them vertical for drag racing with some distance running(I built the car mainly for DW but I latter changed my mind) I didnt see the pic of your car but if the back end is up in the air it just makes it harder to get traction so if you can try to make the car level Thanks much .
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Re: Setting up DA shocks
[Re: FurryStump]
#2819037
09/09/20 05:51 PM
09/09/20 05:51 PM
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Absolutely! My name is Rhett and I’ll be the one beating my head on the side on my trailer! Just saw you are in ct. Where abouts?
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Re: Setting up DA shocks
[Re: FurryStump]
#2822316
09/18/20 03:33 PM
09/18/20 03:33 PM
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So I was watching the video of the last run on Saturday. So it hits the tire and then tries to throw the axle out of the car. At the hit it plants the tire moves forward about 6” then the body separates until it tops out the rear travel and unloads the tire making the tire spin. the tire then bounces with the rear suspension at max lift all the way through the 60’. I think you are pretty close to full stiffness on rebound. Either you continue going stiffer on rebound to slow the separation down or you could lower your percentage of rise number. Basically drawn a line from the center of the contact patch of the tire through the front spring eye. The farther forward that line is angle softens the of the tire slowing down they body separation. . Rhett Thanks for the nudge. Here is a link to the vid for anyone interested . https://youtu.be/bFP9XAFZ5PI Made the following changes which all mostly resulted in minor changes in both directions I removed 2 leafs from each spring pack and got the car almost 2” lower in the rear. Tried it with rear segments clamped and unclamped. Tried tire pressure from 15 lbs (spun uncontrollably) down to 9 and back to 10 whee it did best and consistent 1.50 . Spoke with someone at Viking . Said it hits too hard . Rhetts crew also mentioned this. I can change that by moving front spring eye to a mounting hole further from the chassis , but that will raise the rear even more . At this point I,m just playing with it for education. I will reluctantly dump another $1000 into it for cal tracks and sliders over the winter.
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Re: Setting up DA shocks
[Re: Cab_Burge]
#2822319
09/18/20 03:36 PM
09/18/20 03:36 PM
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The front segments are all clamped and have been . I am reluctant to make any more holes in the frame , as I will likely install sliders . Question: If I did sliders now , would the locations work for a Caltrac mono leaf or would I have to redo ?
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Re: Setting up DA shocks
[Re: dvw]
#2822452
09/18/20 11:18 PM
09/18/20 11:18 PM
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Joined: Mar 2003
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moparacer
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First thing I would do with that car is swap springs and lower the ride height in the rear. Too much rake. I wouldnt be surprised if the shocks are topped out too like Doug is saying.
I had to re-arch my springs on my Barracuda and lower the spring eye up front to fix it.
Its a PITA but so is driving a car that wont work.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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