**update w/ video** Setting up DA shocks
#2813189
08/25/20 06:11 PM
08/25/20 06:11 PM
|
Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
|
OP
mopar
Joined: May 2016
Posts: 630
Ct
|
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: tex013]
#2813394
08/26/20 05:35 AM
08/26/20 05:35 AM
|
Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
|
OP
mopar
Joined: May 2016
Posts: 630
Ct
|
|
|
|
Re: Setting up DA shocks
[Re: dvw]
#2813415
08/26/20 07:37 AM
08/26/20 07:37 AM
|
Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
|
OP
mopar
Joined: May 2016
Posts: 630
Ct
|
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
|
Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
|
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 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 Let us know how yours does on both ends I'd bet the front is too loose. Tighten up the front shock rebound several clicks and try again.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
|
|
|
Re: Setting up DA shocks
[Re: 69dart]
#2813653
08/26/20 06:00 PM
08/26/20 06:00 PM
|
Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
|
OP
mopar
Joined: May 2016
Posts: 630
Ct
|
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: 69dart]
#2813986
08/27/20 03:53 PM
08/27/20 03:53 PM
|
Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
|
OP
mopar
Joined: May 2016
Posts: 630
Ct
|
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]
#2817830
09/06/20 02:06 PM
09/06/20 02:06 PM
|
Joined: Dec 2005
Posts: 11,542 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 11,542
Fulton County, PA
|
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: dthemi]
#2817847
09/06/20 02:49 PM
09/06/20 02:49 PM
|
Joined: Dec 2005
Posts: 11,542 Fulton County, PA
CMcAllister
Mr. Helpful
|
Mr. Helpful
Joined: Dec 2005
Posts: 11,542
Fulton County, PA
|
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.
|
|
|
|
|