Cal trac explanation please
#301481
04/27/09 10:30 PM
04/27/09 10:30 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Wondering if I could get an indepth explanation of Cal tracs and how they work. Im pretty chassis remedial.  When do you add more preload? When do you need to take away preload? When to use the top hole, bottom hole etc? My car (72RR cal tracs with monos) with Ranchos set on 9 separates the body pretty badly. Any adjustments to make with the cal tracs to help this? This was with 1/4 turn preload on both sides. The 60 is very inconsistent, hooks one pass, spins the next, etc. Using MT ET radials, 275/60/15 at 18.5 PSI. Cal trac front shocks, 4.5 inches of travel. Thanks for any help.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Cal trac explanation please
[Re: Von]
#301482
04/27/09 10:36 PM
04/27/09 10:36 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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they prevent the front segment of the spring to wrap up.
top hole for low hp hard hit on the tire
bottom hole for softer hit in higher hp app
set bars till they touch, add preload to right bar till it goes straight
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Cal trac explanation please
[Re: sixpackgut]
#301483
04/27/09 10:47 PM
04/27/09 10:47 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
they prevent the front segment of the spring to wrap up.
top hole for low hp hard hit on the tire
bottom hole for softer hit in higher hp app
set bars till they touch, add preload to right bar till it goes straight
Thanks!!
On the preload part, you can ask 20 guys and get 20 different answers on how to set it.
Am I right that the less preload the harder it hits the tire?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Cal trac explanation please
[Re: Von]
#301484
04/27/09 11:01 PM
04/27/09 11:01 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Quote:
they prevent the front segment of the spring to wrap up.
top hole for low hp hard hit on the tire
bottom hole for softer hit in higher hp app
set bars till they touch, add preload to right bar till it goes straight
Thanks!!
On the preload part, you can ask 20 guys and get 20 different answers on how to set it.
Am I right that the less preload the harder it hits the tire?
well, maybe but i wouldnt want space in the front lever hitting the spring hard. you would be letting the pinion rotate up by doing that. so yes, it may cause a hard hit but it may also break a spring especially if they are stock springs
most cars will go to the right off the hit. add only the amount of prload needed to make the car go straight. if the car goes left, you may have to much preload in the right bar.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Cal trac explanation please
[Re: sixpackgut]
#301485
04/28/09 05:31 AM
04/28/09 05:31 AM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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any special wrenches.. mine are all long and cant make adjustments without jacking the car up on ramps to have on its suspension.....
Mopar Performance
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Re: Cal trac explanation please
[Re: Von]
#301488
04/28/09 09:31 PM
04/28/09 09:31 PM
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Joined: Apr 2003
Posts: 3,507
Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,507
Tulsa, Oklahoma
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Von,
These are the instructions they gave me when I got mine several years ago:
Top Hole – Hardest Hit (start here)
Bottom Hole – Softer Hit, moves IC forward
More Pre-load, Softer Hit
Less Pre-load, air gap, harder hit
If car pulls to the right add a quarter turn of pre-load to the right bar and visa versa.
Set front shocks soft
Set rear shocks on #5, if car wants to porpoise go to 6 or 7 (harder).
If car spins, needs harder hit, go softer
Too much wheelstand…. Softer hit, restrict front travel
Good Luck,
Bill
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Re: Cal trac explanation please
[Re: 340Cuda]
#301489
04/28/09 10:51 PM
04/28/09 10:51 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Von,
These are the instructions they gave me when I got mine several years ago:
Top Hole – Hardest Hit (start here)
Bottom Hole – Softer Hit, moves IC forward
More Pre-load, Softer Hit
Less Pre-load, air gap, harder hit
If car pulls to the right add a quarter turn of pre-load to the right bar and visa versa.
Set front shocks soft
Set rear shocks on #5, if car wants to porpoise go to 6 or 7 (harder).
If car spins, needs harder hit, go softer
Too much wheelstand…. Softer hit, restrict front travel
Good Luck,
Bill
i've never seen that but i had a freind with caltracs set his so the lever would slam the spring and his car looked like a basket ball going down the track. he took them off and put on ladders
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Cal trac explanation please
[Re: 340Cuda]
#301491
04/30/09 10:22 AM
04/30/09 10:22 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
|
Quote:
Von,
These are the instructions they gave me when I got mine several years ago:
Top Hole – Hardest Hit (start here)
Bottom Hole – Softer Hit, moves IC forward
More Pre-load, Softer Hit
Less Pre-load, air gap, harder hit
If car pulls to the right add a quarter turn of pre-load to the right bar and visa versa.
Set front shocks soft
Set rear shocks on #5, if car wants to porpoise go to 6 or 7 (harder).
If car spins, needs harder hit, go softer
Too much wheelstand…. Softer hit, restrict front travel
Good Luck,
Bill
Thanks Bill!  That is what I was looking for.
Gonna try using the top hole as Ive been in the bottom hole. I for sure dont have a high HP combination.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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