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-   -   Setting up Cal Tracs (https://classracer.com/classforum/showthread.php?t=47029)

Todd Hoven 07-03-2013 08:19 AM

Re: Setting up Cal Tracs
 
Has anybody running a stickshift experimented with running preload in both bars? Have you seen any benefits? When I scaled my car, the corner weights started balancing out when I did this.

Dirk Olson 07-03-2013 02:01 PM

Re: Setting up Cal Tracs
 
Guys,

I have been reading all of your entries, all excellent advice. This car has a transbrake, knowing that, how it reacts will be much like a stick car. There are a ton of factors to consider. We all know that every car is differant and one must find that sweet spot. Launch RPM will be critical. Weight placment in the car also plays an important part. Converter also plays an important role, How loose is it and how much run at it, will change how the bcar leaves. I agree with Troy for this application double adjustables are desired. Afcos are spendy and there are others out there. Buy the best you can afford. I can tell this, I question the Landrum springs I had a set when I first started racing my B/S car. First pass bent them, sent them back they gave me a new and improved, first pass bent them again. I then cut the front half off and used them to support the front half of the stock spring worked great. I have replaced them with Caltracks.

Dirk

40Coupe 07-05-2013 08:13 PM

Re: Setting up Cal Tracs
 
I run a 275 M/T Pro radial tire on my 67 Camaro. Basic combination, 468 BBC, 3-speed, 5700-6000 RPM flash depending on tune and DA, 4.10's, 3300+ lbs

Below are some basic suspension and tuning settings I've used based on conditions.

Marginal track surface, early summer air pulling power and adding ballast. 1.35 60 foot

Rear AFCO DA's set full stiff/full stiff
200 lb split monos out back
Caltracs set with slight gap with driver weight and no ballast, top hole
120 lbs ballast in trunk
Tires set at 17 lbs hot
Front AFCO BNC DA's set full loose ext, full stiff comp
180 lb Santhuff's up front + 1" of spacers
5.5" travel
Leaving off the transbrake and two-step set at 2500
-15 degrees Launch Retard in the Power Grid for 1.5 seconds

On a killer track, fall DA, no ballast, car setup to run and leave as hard as possible. 1.27 60 foot

Rear AFCO DA's set 1/2 to 3/4 turn off of full stiff ext. /full stiff comp.,
200 lb split monos out back
Caltracs set with slight gap with driver weight and no ballast, top hole
No ballast in trunk
Tires set at 18-20 lbs hot
Front AFCO BNC DA's set anywhere from 5-10 clicks off full stiff ext, full stiff comp
180 lb Santhuff's up front + 1" of spacers
4.5" travel (1" taken out with limiters)
Leaving off the footbrake at 1800 RPM.
+4 degrees added at launch in the Power Grid to 6500 RPM in low gear

bdixon 10-30-2013 09:53 AM

Re: Setting up Cal Tracs
 
this is for troy give me a call on your wheelie bars thanks B Dixon 605-999-9220 thks

74fb461 06-26-2019 09:10 AM

Re: Setting up Cal Tracs
 
Quote:

Originally Posted by Troy Henderson (Post 381343)
Good advice Jeff. The reason I like the compression fairly stiff if for a leaf spring car. They separate a lot when they leave which creates a bunch of stored energy that can pull the wheel back up too quick. This applies the most to a stick car. Loosen it some for a trans brake car, and even more for a footbrake car.


Is this for slicks or radials? On my car I run full stiff on comp, and anywhere from 5-10 off full tight on ext on my DA Afco's in back. 18-19 lbs of air , this is on a et ss 275/60 STREET RADIAL, Now trying the radial pro's. Foot brake by the way using a 2 step. I've been 1.29 with the 4.10's and 1.32 with the 3.73's on the ET tires in my 3580 lb 74 Pump Gas firebird.

Troy Henderson 06-26-2019 09:48 AM

Re: Setting up Cal Tracs
 
Quote:

Originally Posted by 74fb461 (Post 591333)
Is this for slicks or radials? On my car I run full stiff on comp, and anywhere from 5-10 off full tight on ext on my DA Afco's in back. 18-19 lbs of air , this is on a et ss 275/60 STREET RADIAL, Now trying the radial pro's. Foot brake by the way using a 2 step. I've been 1.29 with the 4.10's and 1.32 with the 3.73's on the ET tires in my 3580 lb 74 Pump Gas firebird.

This is for slicks on my application. I'm not a radial guy but they probably need to be much softer to keep the tire planted.

74fb461 06-26-2019 10:37 AM

Re: Setting up Cal Tracs
 
Quote:

Originally Posted by Troy Henderson (Post 591335)
This is for slicks on my application. I'm not a radial guy but they probably need to be much softer to keep the tire planted.

I was just curious as i Seen that post, on my slicks i do back off the comp some to allow it to get up on the tire better


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