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Shock settings, radials? #2568374
10/23/18 02:47 PM
10/23/18 02:47 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
I Live Here

Joined: Oct 2003
Posts: 11,678
W. Kentucky
There is a street car shoot out coming up in a couple weeks at my local track, if the weather holds I'd like to run it again. The last one I ran the track was prep nil and I suppose this one will be no better. In the last one I made it to the second round but my car spun at the hit, I peddled it and pulled into second and 60-80' out it got stupid and almost crossed the center line before I got it caught up and the race was lost as I couldn't run my opponent down and he went on to win the class.

If my car spins at the hit what adjustments do I make to the shocks? I have some ballast I can add if needed to help keep it hooked and I can leave in second gear to help tame it on the hit. I'm on a 325/50 MT radial and have Viking double adjustables on all four corners, Cal Tracs, monos and stock front suspension. Also I was foot braking at the first event, the trans brake resulted in instant smoke.

Any suggestions, advice?

Thanks, Justin

Last edited by justinp61; 10/23/18 02:52 PM.
Re: Shock settings, radials? [Re: justinp61] #2568390
10/23/18 03:22 PM
10/23/18 03:22 PM
Joined: Oct 2007
Posts: 472
Minnesota, USA
humpty Offline
mopar
humpty  Offline
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Posts: 472
Minnesota, USA
Hey Justin - I feel your pain. I fought the same issue and got it under control this year with proper shock valving (by Menscer). It's hard to say without seeing video but my guess is you're offloading the rear tires by hitting them too hard and/or running out of front travel.

I'd check the bars, make sure you have .070 gap on the driver's side, and 3 flats of preload on the passenger side. Unless you know for a fact you aren't running out of front travel, I'd try slowing down the front. This was the largest improvement in my case.

Jeff

Re: Shock settings, radials? [Re: justinp61] #2568399
10/23/18 03:40 PM
10/23/18 03:40 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
I Live Here

Joined: Oct 2003
Posts: 11,678
W. Kentucky
Thanks Jeff, I don't think I'm running out of front travel as it's not really lifting the front much.

My current shock settings are 12 on compression and 4 on the rebound on the front, 1 on compression and 7 on the rebound on the rear. I just got off the phone with viking and they recommended leaving the front as is but changing the rear to 10-12 on compression and 4-5 on the rebound. I'll give it a try if they run the race.

Re: Shock settings, radials? [Re: justinp61] #2568417
10/23/18 04:17 PM
10/23/18 04:17 PM
Joined: Aug 2003
Posts: 4,662
On the parachute mount
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n20mstr Offline
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On the parachute mount
will you be getting any test hits at the track?

walk the starting line if you can, see if there are any bald spots or rubber peeling.

Leaving in second will help a lot

Remember the concept of hooking a radial, Smash the tire and hold it there.
So loose on compression and tight on rebound.

In the front, try to remember, a lot of travel with a tighter shock works well to keep the front transferring for a longer time. Some times hitting as limiter too soon upsets the tire and makes it spin.


....BAD A$$ STREET CAR.....
Re: Shock settings, radials? [Re: justinp61] #2568422
10/23/18 04:26 PM
10/23/18 04:26 PM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
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Tig  Offline
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Joined: Jan 2003
Posts: 2,902
A shed in England
I've found that you can hit a radial harder than a bias ply. If I use the same settings for a radial with a bias ply slick on the rear it wads up way too much. All due respect to N20 Monster but I thought it would be loose on rebound and tight on compression to hit the tyre hard and hold it??


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Shock settings, radials? [Re: Tig] #2568424
10/23/18 04:29 PM
10/23/18 04:29 PM
Joined: Aug 2003
Posts: 4,662
On the parachute mount
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n20mstr Offline
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Posts: 4,662
On the parachute mount
Originally Posted By Tig
I've found that you can hit a radial harder than a bias ply. If I use the same settings for a radial with a bias ply slick on the rear it wads up way too much. All due respect to N20 Monster but I thought it would be loose on rebound and tight on compression to hit the tyre hard and hold it??



sorry maybe I got the terms backwards...lol

you want the shock loose coming apart and hard going back in.


....BAD A$$ STREET CAR.....
Re: Shock settings, radials? [Re: n20mstr] #2568427
10/23/18 04:37 PM
10/23/18 04:37 PM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
master
Tig  Offline
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Joined: Jan 2003
Posts: 2,902
A shed in England
Originally Posted By n20mstr
Originally Posted By Tig
I've found that you can hit a radial harder than a bias ply. If I use the same settings for a radial with a bias ply slick on the rear it wads up way too much. All due respect to N20 Monster but I thought it would be loose on rebound and tight on compression to hit the tyre hard and hold it??



sorry maybe I got the terms backwards...lol

you want the shock loose coming apart and hard going back in.


Good to know, I thought I was going crazy grin


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03






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