Page 1 of 2 1 2 >
Topic Options
#2324137 - 06/20/17 10:21 AM Advices to Setup Double Adjustment Shocks (Updated)
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
Hi Folks,

Finally I could test my new set of Viking DA Shocks that I installed in my car. These shocks already improve my 60ft from 1.58 to 1.54 but I'm still having tire bouncing on the start.

I'm using this setup on the Shocks:

Front: Compression = 12, Rebound 2.
Rear: Compression = 4, Rebound 12.

My car is an A Body, 3300lbs Small Block with 464WHP, Footbrake, 4500 Stall Converter, Hoosiers 28x10.5, 4.56 Gear, Leaf Springs with Assassin Traction Bars.

I'm sending two videos of the start... So if someone could see that and can support me to fix this issue will be great.

https://www.youtube.com/watch?v=kpsFBEn8U4A

https://www.youtube.com/watch?v=ErDPMz66wkw





Thanks,

Diego Reis
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2324345 - 06/20/17 05:27 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
SpareParts Offline
pro stock

Registered: 09/18/12
Posts: 1546
Loc: Janesville, WI
Stiffen the extension and the compression.

Top
#2324477 - 06/20/17 10:21 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31224
Loc: Bend,OR USA
If compression is going down and rebound is extending the shocks I would stiffen up the front shocks on compression and loosen up the extension some more, probably the same on the rear twocents
Have you check the rear spring rear shackle angles with the suspension unloaded with the wheels off the ground and no weight on the rear tires by having jack stands under the frames yet? If no do that and see what angle you have on the rear shackles scope
If they hang straight down or are angled towards the front end you need to think about fixing that scope shruggy
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Top
#2324573 - 06/21/17 07:30 AM Re: Advices to Setup Double Adjustment Shocks [Re: Cab_Burge]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
Shackles looks like fine but I'm plannig change them for Sliders ASAP... smile

Suspension Loaded



Suspension Unloaded


Another thing that I'm looking is Traction Bars angle. I'm running with lower holes mounted front/rear and I understand that I'm having a very agressive rear tires hitting on the ground with this combination because front of the bar is higher them rear and when I leave the brake and car launch, loading suspension this angle change a lot hitting tires on the ground so hard as you can see on these picture that I posted above...

So, make sense or don't?

Thanks
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2324636 - 06/21/17 10:13 AM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
sr4440 Offline
mopar

Registered: 02/06/08
Posts: 463
Loc: Central TEXAS!!!!
Looking at the 1st video, the car plants the tire fine then it bounces back up in the car. To get rid of that hop, tighten the compression on the rear from a 4 to a 7. that should keep the tire planted.


Joe
_________________________
Without Data, you’re just another guy with an opinion.

Top
#2325480 - 06/22/17 09:22 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
humpty Offline
enthusiast

Registered: 10/17/07
Posts: 382
Loc: Minnesota, USA
It looks like the front is running out of travel and offloading the rears. I probably have 20 - 30 videos of mine doing the same. If you can, lower the front to get as much travel as possible - set the front shock rebound (extension) to full loose and start making passes. Tighten the rebound 10% each pass until the 60 foot times start to fall off.

I tried to sort out the rear first and didn't make any progress until I added travel and started tightening the front. I now have 5" of travel in the front with standard valved Dual Adjustable AFCO's and already ran out of rebound adjustment, but went from 1.48 60's to 1.41's. They are currently getting revalved with stiffer valving.

Also make sure your rear shocks are long enough by unbolting the shocks and letting the rear hang. The shocks should be an inch or two longer than the distance between the upper and bottom mounts when suspended.
_________________________

72 Duster - 408ci W2, 10.18@131. Shooting for 10.0's in 2018!
https://m.youtube.com/watch?v=Q4P51j38-MI

Top
#2325517 - 06/22/17 10:23 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
dthemi Offline
master

Registered: 10/31/04
Posts: 2709
Loc: back in Georgia
Make only one change at a time.

Looks like it extends/separates way too much to me. Tighten, if you have any more adjustment, the extension. The compression could be set in whatever the middle is to start.

Personally I like to start with everything, front, and rear tight hoping it'll spin, then loosening up only what it takes to get the best 60.

Top
#2325580 - 06/23/17 01:14 AM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31224
Loc: Bend,OR USA
Me thinks the rear shackles are going past center(straight up and down) when it leaves and that will make the rear unload causing the hopping shruggy
Is there any way you can video the back of the car by the rear springs, Go Pro camera maybe, to see if that is happening or not?
I've seen that same problem on more than one A body drag car work
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Top
#2325731 - 06/23/17 12:00 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
Guys, I really appreciate all advices that everyone gave me. I'll make some changes based on your advices and post all improvements here.

Thanks a lot!
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2325742 - 06/23/17 12:32 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
Al_Alguire Offline


Registered: 01/20/03
Posts: 16810
Loc: Las Vegas
As DT pointed out start stiff and go from there. Depends on track conditions what will make it happy. Looks like it is separating to much to me as well and I would follow his way. Tighten the extension start with compression in the middle...
_________________________

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"

Top
#2325755 - 06/23/17 12:56 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
SCATPACK 1 Offline
pro stock

Registered: 04/30/05
Posts: 1436
Loc: TN
Originally Posted By 360tripleblack77
Hi Folks,

Finally I could test my new set of Viking DA Shocks that I installed in my car. These shocks already improve my 60ft from 1.58 to 1.54 but I'm still having tire bouncing on the start.

I'm using this setup on the Shocks:

Front: Compression = 12, Rebound 2.
Rear: Compression = 4, Rebound 12.

My car is an A Body, 3300lbs Small Block with 464WHP, Footbrake, 4500 Stall Converter, Hoosiers 28x10.5, 4.56 Gear, Leaf Springs with Assassin Traction Bars.

I'm sending two videos of the start... So if someone could see that and can support me to fix this issue will be great.

https://www.youtube.com/watch?v=kpsFBEn8U4A

https://www.youtube.com/watch?v=ErDPMz66wkw





Thanks,

Diego Reis


Diego
That is such a cool looking A Body. I have never seen a South American A Body before. They should have offered that style here. They would have sold a lot more A Bodies. I LIKE IT!
_________________________
Old Geezer Racing

Top
#2330560 - 07/03/17 08:15 AM Re: Advices to Setup Double Adjustment Shocks [Re: SCATPACK 1]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
Thanks ScatPack! I really like the body and details of Brazilian Chargers. Basically the body is the same them 68' Darts with some changes in details... smile
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2330570 - 07/03/17 08:46 AM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
Folks, I measured front end travel this weekend and had 4.2" of travel... So I reworked the suspension bumpers that was blocking my front end travel and lowered front of car 1/2" and now I've 5". I know that the golden rule is do not change more than one thing per time but I'm thinking in tight rear shocks extension from 12 to 18 to start.

Jully 22, 23 will have an event and I will can test my last adjustments...

Thanks Guys!
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2427718 - 01/02/18 11:02 AM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
As I posted in another topic, my car has made his best ET so far. I could drop 60ft from 1.54 to 1.50 based on advices that I received from everyone on this topic. up

The problem with tire boucing is almost solved but the car still boucing tires on start. I'm thinking that rear separation is too much as Al Alguire told me before and you can see at picture attached. I have put extra clamps on front segment of leaf springs but I think that's not enough. Maybe time to change for Calvert Mono Leafs! wrench

I started with last configuration that I ran on the rear, 12 rebound and 4 compression and ran at 1.51. So I tighten the rebound for 14 and compression to 5 and 60ft droped to 1.50. I just could made only three passes and don't had time enough to work more on suspension. If I had time I'll tighten more rear shocks but I couldn't.

I'm sending below a video from my GoPro camera that I installed under the car. Sorry for the quality but was darken when I made the video.

Advices will be great again.. laugh

https://youtu.be/FqMf1UC3lVs


Attachments
26219486_1732266190137149_758253616895470806_n.jpg


_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2427726 - 01/02/18 11:17 AM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
WHITEDART Online   laugh2
top fuel

Registered: 10/06/11
Posts: 2395
Loc: bean town ....Ca
It looks to me like.. your settings are still way too loose.. and yes the monoleaf is the way to go it also helps get rid of weight. On compression you should be. Almost full tight... and on extension somewhere in the middle.. if the track is greasy you can loosen extension up for some extra hit... the front end looks way to stiff.. do you have aftermarket a arms.. the Freer you can get the front end the better the car will work


Edited by WHITEDART (01/02/18 11:18 AM)
_________________________
In the 8s N/A.with Brett miller W8's
5.42 8.52 159.

Top
#2427758 - 01/02/18 12:06 PM Re: Advices to Setup Double Adjustment Shocks [Re: WHITEDART]
360tripleblack77 Offline
member

Registered: 10/29/15
Posts: 159
Loc: Gravataí, RS, Brazil
I'm talking with Calvert tech support right now about monoleaf. This should be my next upgrade. I agree with you about front too stiff. I'm running on Rebound 2 and Compression 12 and I lowered front of the car to have more front end travel. currently Front end travel is 5" and still looks too stiff.

About control arms I'm still using OEM arms and torsion bars too. frown

Any recomendation of wich control arms to use?
_________________________
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph

Top
#2427791 - 01/02/18 01:00 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31224
Loc: Bend,OR USA
That looks good to me up
There is always more in it as we get brighter and hungrier for more speed and quicker ET whistling devil
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Top
#2427809 - 01/02/18 01:20 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
WHITEDART Online   laugh2
top fuel

Registered: 10/06/11
Posts: 2395
Loc: bean town ....Ca
Originally Posted By 360tripleblack77
I'm talking with Calvert tech support right now about monoleaf. This should be my next upgrade. I agree with you about front too stiff. I'm running on Rebound 2 and Compression 12 and I lowered front of the car to have more front end travel. currently Front end travel is 5" and still looks too stiff.

About control arms I'm still using OEM arms and torsion bars too. frown

Any recomendation of wich control arms to use?
I have the early qa1 upper control arms on my car they don't make that version anymore.. at least so I think.. I think Hotchkiss make some nice upper control arms kind of spendy you might take a look..
_________________________
In the 8s N/A.with Brett miller W8's
5.42 8.52 159.

Top
#2427815 - 01/02/18 01:27 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
hemi_doug Offline
master

Registered: 01/21/03
Posts: 3439
Loc: Northern N.J.
I have been eyeballing these...seem reasonable. Anybody using them?

http://www.magnumforce.com/magnumstore/shop/item.aspx?itemid=13
_________________________

71 440-6 4spd & 69 Hemi 4spd

Top
#2427817 - 01/02/18 01:30 PM Re: Advices to Setup Double Adjustment Shocks [Re: 360tripleblack77]
Al_Alguire Offline


Registered: 01/20/03
Posts: 16810
Loc: Las Vegas
As Shiloh pointed out to many people overlook the front end and just how tight many of them are. Not talking about the shocks them selves per se' just the suspension in general. As for the rear shock keep tightening the extension til it spins smile Soften the rebound as much as it will tolerate as well for now. Generally speaking the extension controls the hit or plant of the tire and the rebound how well or long it plants the tire..

With the numbers you are talking are you referring to how far from stiff or from soft they are?? Just to clarify
_________________________

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"

Top
Page 1 of 2 1 2 >

Advertisement
Forum Stats
25,486 Registered Members
32 Forums
192,995 Topics
2,252,713 Posts

Most users ever online: 1,424 @ 06/20/18 07:18 PM
Moparts Newest Topics
Electronic Ignition ECU of choice?
by GoodysGotaCuda
09/20/18 09:43 PM
Speed tracking app?
by gss
09/20/18 09:23 PM
Smallest pit/tow vehicle
by n20mstr
09/20/18 09:03 PM
SB BIG PORT VICTOR HEAD
by Jason B
09/20/18 08:59 PM