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**update w/ video** Setting up DA shocks #2813189
08/25/20 06:11 PM
08/25/20 06:11 PM
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Wirenut Offline OP
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Purchased and installed Viking crusaders front and rear.
abody .
SS springs
Foot brake
Auto
650 ish hp bb
Car runs 10.0s

The car started loosing 60’ 1.40ish typically and started sliding back to 1.45 or slower. Shocks were nearly 20 year old ce 3 ways.

I have been playing with the Vikings and not making much headway. TT last Saturday 8 runs and couldn’t get below 1.50. . Worked mostly on the rears with the fronts loose on rebound and about 5 clicks of compression. Started out being really a handful out of the hole and down track . By the end of the day I can say it felt better but still a weak 60’.

I started the day with the rears 5 clicks in compression and 12 rebound.

Tried adding rebound and lost time.

Tried adding compression and started to pick up then fell off again.

Am I doing the right thing working the rear first ?

Is there a ratio of compression vs rebound I should be following?

I welcome any experienced advice

current last visit below

only 2 runs before a flat tire.
got the front to sit lower . cant go much lower with tire /header rub.
added dampening to mostly rebound as suggested .
first run is right view vid. front = c8 r18 rear = c12 r16 as you will see bounces like mad
second run left view vid. front = c12 r20 rear=c14 r18 better but still not great . rebound is 1 click away from max in front a 3 from max in rear .

I think I need the stiffer valving kit from viking as i am almost out of rebound adjustment .

tire psi was 9

the 60 in the 2nd vid picked up .07

https://www.youtube.com/watch?v=w_YgF_2LWvY

https://www.youtube.com/watch?v=6aZXcd58u0g

Last edited by Wirenut; 09/06/20 11:31 AM. Reason: updated
Re: Setting up DA shocks [Re: Wirenut] #2813291
08/25/20 09:32 PM
08/25/20 09:32 PM
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Sydney,Australia
tex013 Offline
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radial or crossply ?

Tex


New best ET 10.259@129.65 .
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Re: Setting up DA shocks [Re: tex013] #2813313
08/25/20 10:09 PM
08/25/20 10:09 PM
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MI, usa
dvw Offline
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If the front rebound is too loose the front end will top out to quickly unloading the rear. Tighten the front up if they're full loose.
Doug

Re: Setting up DA shocks [Re: dvw] #2813338
08/25/20 11:07 PM
08/25/20 11:07 PM
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Bend,OR USA
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Cab_Burge Offline
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Originally Posted by dvw
If the front rebound is too loose the front end will top out to quickly unloading the rear. Tighten the front up if they're full loose.
Doug
iagree wrench
I would work on the front now, you have data from the rear to help you on both ends, my S/P car liked full stiff on the front shocks extension, going up work
Let us know how yours does on both ends wrench


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Setting up DA shocks [Re: tex013] #2813394
08/26/20 05:35 AM
08/26/20 05:35 AM
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Wirenut Offline OP
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Mt et drags non radial

Re: Setting up DA shocks [Re: Wirenut] #2813395
08/26/20 05:37 AM
08/26/20 05:37 AM
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Wirenut Offline OP
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Ok thank you both.

Unfortunately I don’t have anyone to video

Re: Setting up DA shocks [Re: Wirenut] #2813398
08/26/20 06:08 AM
08/26/20 06:08 AM
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MI, usa
dvw Offline
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Teach someone to video with a phone. It's amazing how good you can do. Especially in slow mo.
Doug

Re: Setting up DA shocks [Re: dvw] #2813415
08/26/20 07:37 AM
08/26/20 07:37 AM
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Wirenut Offline OP
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Originally Posted by dvw
Teach someone to video with a phone. It's amazing how good you can do. Especially in slow mo.
Doug


Thanks. My kids used to come but all work the weekends now.
I will have to figure something out

Re: Setting up DA shocks [Re: Cab_Burge] #2813440
08/26/20 09:11 AM
08/26/20 09:11 AM
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Marion, South Carolina [><]
an8sec70cuda Offline
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Originally Posted by Cab_Burge
Originally Posted by dvw
If the front rebound is too loose the front end will top out to quickly unloading the rear. Tighten the front up if they're full loose.
Doug
iagree wrench
I would work on the front now, you have data from the rear to help you on both ends, my S/P car liked full stiff on the front shocks extension, going up work
Let us know how yours does on both ends wrench

iagree I'd bet the front is too loose. Tighten up the front shock rebound several clicks and try again.


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'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
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Re: Setting up DA shocks [Re: an8sec70cuda] #2813467
08/26/20 09:44 AM
08/26/20 09:44 AM
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Johnstown
69dart Offline
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I would probably call viking support since every shock and setup seems different.

My experience I wouldn't be afraid to try 3 clicks from full soft up front. It was HOT around here this weekend so if the track is HOT you need every ounce of travel you can find.

Unless its wheelstanding to out of control its not to loose.

On the rear HOT and greasy again means soften compression. When the track gets better you can add some clicks and stiffen.

On the rear the extension can be set somewhere in the middle to start > if the tire is getting crushed add > if spinning soften.

How stiff is the rear of the car? Can you push it down fairly easy?

(Not aimed at anyone here) - Its disappointing how many folks buy expensive shocks then set their cars up like hardtails and complain that the track is junk.


33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage
Re: Setting up DA shocks [Re: an8sec70cuda] #2813651
08/26/20 05:55 PM
08/26/20 05:55 PM
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Wirenut Offline OP
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Originally Posted by an8sec70cuda
Originally Posted by Cab_Burge
Originally Posted by dvw
If the front rebound is too loose the front end will top out to quickly unloading the rear. Tighten the front up if they're full loose.
Doug
iagree wrench
I would work on the front now, you have data from the rear to help you on both ends, my S/P car liked full stiff on the front shocks extension, going up work
Let us know how yours does on both ends wrench

iagree I'd bet the front is too loose. Tighten up the front shock rebound several clicks and try again.


Your the second to say this so I will give it a try.

Re: Setting up DA shocks [Re: 69dart] #2813653
08/26/20 06:00 PM
08/26/20 06:00 PM
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Wirenut Offline OP
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Originally Posted by 69dart
I would probably call viking support since every shock and setup seems different.

My experience I wouldn't be afraid to try 3 clicks from full soft up front. It was HOT around here this weekend so if the track is HOT you need every ounce of travel you can find.

Unless its wheelstanding to out of control its not to loose.

On the rear HOT and greasy again means soften compression. When the track gets better you can add some clicks and stiffen.

On the rear the extension can be set somewhere in the middle to start > if the tire is getting crushed add > if spinning soften.

How stiff is the rear of the car? Can you push it down fairly easy?

(Not aimed at anyone here) - Its disappointing how many folks buy expensive shocks then set their cars up like hardtails and complain that the track is junk.







I think the rear of the car seems stiff. Meaning try and lean into it and bounce it and it doesn’t much.
It’s funny you ask because I was sitting in the staging lanes and a guy in a Torino kept walking up to his car and bouncing the rear and it seemed really easy like very soft . So I tried mine when I got back in the pits but not so much.

Last edited by Wirenut; 08/27/20 05:43 AM.
Re: Setting up DA shocks [Re: Wirenut] #2813775
08/26/20 10:39 PM
08/26/20 10:39 PM
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dvw Offline
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If it cant hit the tire hard enough travel can help. Loose on the other hand usually just unloads when it tops out. As long as it is rising, the front is adding transfer. Once the wheels are off the ground shocks and springs mean zero. If you don't have enough power to keep it up in the air, now your in trouble.
Doug

Re: Setting up DA shocks [Re: dvw] #2813914
08/27/20 12:15 PM
08/27/20 12:15 PM
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Johnstown
69dart Offline
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dvw is right. I put thicker bump stops on my dart and it ruined the car. I ended up running as thin as possible.

Some things to consider:

How low are the front torsion bars set? If possible you can lower the front to get more rotation.

Check your front suspension limiters / bump stops. Maybe they can be cut shorter to add some travel. A little bit can really help.

Tire pressure is another big factor. Check your gauge with another racer. I've seen then go off by 2 or 3 lbs randomly.

If its not crushing the tire then maybe lower it another 1/2 lbs.


33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage
Re: Setting up DA shocks [Re: 69dart] #2813986
08/27/20 03:53 PM
08/27/20 03:53 PM
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Wirenut Offline OP
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Originally Posted by 69dart
dvw is right. I put thicker bump stops on my dart and it ruined the car. I ended up running as thin as possible.

Some things to consider:

How low are the front torsion bars set? If possible you can lower the front to get more rotation.

Check your front suspension limiters / bump stops. Maybe they can be cut shorter to add some travel. A little bit can really help.

Tire pressure is another big factor. Check your gauge with another racer. I've seen then go off by 2 or 3 lbs randomly.

If its not crushing the tire then maybe lower it another 1/2 lbs.




What do you mean by how low are the torsion bars set? Measured from where?

Cutting off the stops someone welded on could be messy leaving it looking hacked.
I thought instead I would replace the stock lower bump stops that are about 1.50 with some shallower ones that would gain me about an inch then I would crank t bars down so it’s just touching.

Re: Setting up DA shocks [Re: Wirenut] #2817756
09/06/20 11:30 AM
09/06/20 11:30 AM
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Wirenut Offline OP
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I made an update to the original post.

Not sure if thats the common / sensible way to do it or should I have added as a reply ?

Re: Setting up DA shocks [Re: Wirenut] #2817830
09/06/20 02:06 PM
09/06/20 02:06 PM
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CMcAllister Offline
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Rear suspension isn't moving, at all. Only thing happening is the tire bouncing up and down. Not spinning at the hit. Maybe rotating the tire one its out some.

Is it set high in the rear intentionally? Tire clearance issues? What springs are they? They look to be way wrong and way too heavy. What shock mounts? Stock? What is the installed at ride height C-C measurement on the shock vs. measurement fully extended? If the rear shock is a stock length deal on stock mounts, it has to be nearly topped out.,

Front is separating. Looks like it tops out and at that point is just bouncing the tire like a basketball.

Last edited by CMcAllister; 09/06/20 02:44 PM.

If the results don't match the theory, change the theory.
Re: Setting up DA shocks [Re: CMcAllister] #2817839
09/06/20 02:31 PM
09/06/20 02:31 PM
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dthemi Offline
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Just chiming in.

Going way, way down in rear tire size would likely give you near a tenth between ratio, the tire adhering to the track too much down track, air over the car improvements with the car not being in a wedge, and weight transfer is easier if the car is more level.

Re: Setting up DA shocks [Re: dthemi] #2817847
09/06/20 02:49 PM
09/06/20 02:49 PM
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Car needs to come way down in the back. If it has leafs, I'm assuming it's stock mounting with a mini-tub. That's the separation I would expect to see (maybe) at the hit with SS springs. Not at static ride height.


If the results don't match the theory, change the theory.
Re: Setting up DA shocks [Re: CMcAllister] #2817942
09/06/20 06:37 PM
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Wirenut Offline OP
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Thanks for the input . I truly appreciate the help .

They are ss springs (don’t know which ones) .

They are mounted inboard , via dc relocation kit. Front eye is as close to car as adjustment holes allow. Rear hanger is through frame fairly close to floor . Angle looks good .

Tires are 31.25

Just throwing this out there. I have had this car for a few years . Until last year it pretty consistently 60’ed 1.40 to 1.42 with an occasional 1.39 And an occasional 1.45. That was with 20 year old ce 3-way shocks .

Seems like I am having to go through a lot of change to only get back to where I started.

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