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INITIAL SHOCK SET UP................. #2429430
01/05/18 01:51 PM
01/05/18 01:51 PM
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Thumperdart Offline OP
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Jason Pettis turned down the upper and lower stock shock stud mounts to .0480 to fit in the heims on the Vikings and I made a bottom plate to raise em up 1 1/4 inches since they were a tad shorter than the Ranchos. So, being they have 6 in of travel I was thinking 1 1/2- 1 3/4 compression and the rest extension, sound right............. thumbs


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429450
01/05/18 02:50 PM
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Frostbitefalls MN (Rocky&Bullw...
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Dom, if you expect a lot of extension on the hit, you could start there. Something made up to check max travel in both directions, like a rod with gromets on it and something attached to the axle end of the shock mount to push those gromets could tell you a few things.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: INITIAL SHOCK SET UP................. [Re: gregsdart] #2429456
01/05/18 03:17 PM
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The Ranchos had 2 1/4 compression and less than 4" of extension and had no issues using the tie wrap test for both extension and compression on the street so being these will be tighter, I will go w/the 1 3/4 then.........Thankxxx................ beer


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429488
01/05/18 04:17 PM
01/05/18 04:17 PM
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New Lenox IL
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Dom you have leaf springs correct?
Leafs tend to rise = body separation more than ladders or 4 links IMHO.

IIRC you have calverts bars on. Do they have less body separation than say SS springs?

Are you still looking for SA front shocks?

Don

Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429497
01/05/18 04:32 PM
01/05/18 04:32 PM
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Bend,OR USA
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With six inches of rear shock travel I have set them at two inches from bottomed out (1/3 travel) at static ride height per instructions from Penske years ago on Skips car up
I have talk to several other shock companies about the initial ride height and they all basically said the same thing on a street and strip drag car shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429519
01/05/18 05:24 PM
01/05/18 05:24 PM
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Dom likely little reason to need much more compression on your deal. Except maybe when seeing street duty. Our Camaro is mostly street driven and we have 1.5" com compression on the shocks and every once in awhile on the highway it will bottom out. I am willing to live with that. FWIW it is a Caltrac/mono leaf car as well. If it was more a street car I'd want more but IMO you will be fine. You need all the extension you can get with that set up.


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Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429527
01/05/18 05:31 PM
01/05/18 05:31 PM
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Are the shocks mounted straight up & down or like factory angled ? an angled shock travels less VS suspension travel than a straight up & down mount, just sayin smile

Last edited by csk; 01/05/18 05:33 PM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429564
01/05/18 06:56 PM
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6" is pretty short for a leaf spring car...

The shocks move MORE when they are mounted on an angle...not less, but not by a ton.

Depends on the angle...if you had 30 degrees, every 1.73" of vertical travel = 2" of travel along the angle. Less angle means less difference. So in the end it's not a huge deal, but might make or break you with a short shock.

Last edited by dizuster; 01/05/18 06:57 PM.
Re: INITIAL SHOCK SET UP................. [Re: dizuster] #2429573
01/05/18 07:10 PM
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Shocks are straight up n down and yes on the Caltracs...........Going to mount em now and see where we're at so thankxxx guys next is DA Vikings on the front then track time there after............ boogie drive beer

Last edited by Thumperdart; 01/05/18 08:24 PM.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429579
01/05/18 07:20 PM
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It's going to drag the bumper

Re: INITIAL SHOCK SET UP................. [Re: Al_Alguire] #2429589
01/05/18 07:51 PM
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Originally Posted By Al_Alguire
Dom likely little reason to need much more compression on your deal. Except maybe when seeing street duty. Our Camaro is mostly street driven and we have 1.5" com compression on the shocks and every once in awhile on the highway it will bottom out. I am willing to live with that. FWIW it is a Caltrac/mono leaf car as well. If it was more a street car I'd want more but IMO you will be fine. You need all the extension you can get with that set up.
iagree but Al come on I really believe the Camaro stuff is offtopic hahaha..

Last edited by WHITEDART; 01/05/18 07:52 PM.

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Re: INITIAL SHOCK SET UP................. [Re: WHITEDART] #2429591
01/05/18 07:53 PM
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Oh I have to apologize I just remember the thumper runs bowtie rear suspension


In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429595
01/05/18 08:03 PM
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Re: INITIAL SHOCK SET UP................. [Re: WHITEDART] #2429606
01/05/18 08:25 PM
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Originally Posted By WHITEDART
Oh I have to apologize I just remember the thumper runs bowtie rear suspension


Hows that Mr. "FORD" rear suspension...............lol They are installed and I have a tad over 2" of compression so soon we will see what this lipstick pig will run............... biggrin beer

Last edited by Thumperdart; 01/05/18 08:27 PM.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Al_Alguire] #2429719
01/06/18 12:54 AM
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Originally Posted By Al_Alguire
Dom likely little reason to need much more compression on your deal. Except maybe when seeing street duty. Our Camaro is mostly street driven and we have 1.5" com compression on the shocks and every once in awhile on the highway it will bottom out. I am willing to live with that. FWIW it is a Caltrac/mono leaf car as well. If it was more a street car I'd want more but IMO you will be fine. You need all the extension you can get with that set up.


Al, I drive this thing almost weekly and have for many months that's why she's wore out....... laugh2


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429777
01/06/18 03:40 AM
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And Don't Forget about adding Preload to the passenger side rear since in the vids your crushing the rear driver side tire and the passenger side tire appears to be floating, since you took that extra batt out of the rear.

You did do 3 changes though to lose your 60 ft. from 1.30 to 1.40

Batt remove.
Slick change.
Carb change.


Don't you know the rule of thumb, Change 1/one thing at a time, Cab and Pettis should of drilled that in your head by now.


Now, based on the blurry vids, your axel is rotating down on the driver side and up on the passenger side. Exactly how physics would have it do. Keep that into consideration after your initial mechanical shock set up. up

Re: INITIAL SHOCK SET UP................. [Re: Sport440] #2429782
01/06/18 03:57 AM
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You got the blurry vids part right! laugh No seriously, good call!

Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2429882
01/06/18 01:27 PM
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Hey now my Camaro has hybrid rear suspension Dana 60 and Caltracs. Did I mention its Panther Pink too smile Given those two items I feel its always on topic here

Dom I know you do and I know those beautiful Cali roads. We used to drive the Camaro 55 miles on I80 to get to Sac Raceway and rarely had an issue, you'll be fine as far as compression goes. 6" of travel is NOT a ton but IMO will probably be sufficient. Camaro only has 5 and its been 9.70's with its pump gas pig


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"It's never wrong to do the right thing"
Re: INITIAL SHOCK SET UP................. [Re: Sport440] #2429891
01/06/18 01:45 PM
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Originally Posted By Sport440
And Don't Forget about adding Preload to the passenger side rear since in the vids your crushing the rear driver side tire and the passenger side tire appears to be floating, since you took that extra batt out of the rear.

You did do 3 changes though to lose your 60 ft. from 1.30 to 1.40

Batt remove.
Slick change.
Carb change.


Don't you know the rule of thumb, Change 1/one thing at a time, Cab and Pettis should of drilled that in your head by now.


Now, based on the blurry vids, your axel is rotating down on the driver side and up on the passenger side. Exactly how physics would have it do. Keep that into consideration after your initial mechanical shock set up. up


I agree w/you on these things and have watched the "blurry" vid several times and see the same thing, the axle is teeter tottering and the truck shocks, soft sidewall tires and battery removal made it worse. 2nd batt is back, new bad ass shocks ft and rear and we will let er eat............The carb works great but does need some more street testing which I will do before we head back out in a couple of weeks......... beer thumbs New goal; 1.29 60 ft. 6.000 et at 113+ mph.............. drive


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: INITIAL SHOCK SET UP................. [Re: Thumperdart] #2430471
01/07/18 01:43 PM
01/07/18 01:43 PM
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Swing by so that we can finish up a 8.50 cert cage. Bring plenty of beer. Pizza is only around the corner.


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