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67champ 03-27-2009 10:36 AM

Scaling F-Body GM
 
Can someone explain to me what the purpose is in what I think they call "scaling" a drag car? I am asking about the process of weighing each four "corners" of the car, and making each "corner" a certain weight or percentage.

Is this something that a person would do to a leaf spring camaro or firebird? If so, what would be the proper percentage of weight per corner, etc.?

THANKS!

63corvette 03-27-2009 02:40 PM

Re: Scaling F-Body GM
 
Scaling a car is to setup the suspension to plant the rear tires and go straight on the launch.
It can be done with the four link or ladder bar suspension. It also allows you to keep the front end square with the front wheel equally loaded on the launch which will keep the car straight.
I am not sure how anyone would do it with a stock suspension.
With a good set of scales you can setup a car in the garage and have it ready to race as far as the suspension is concerned before every taking it down the track.
My 2 Cents

Bob Pagano 03-27-2009 03:08 PM

Re: Scaling F-Body GM
 
Yep, Stocker's do it too. done with you in car, balance weight and move as much to the rear as possible.

Tony Curcio 03-27-2009 06:10 PM

Re: Scaling F-Body GM
 
Scaling is very helpful if you just built a new car, or it has been in storage a long time, or in a crash. It can save a lot of time if it pulls to one side as well.

If you install a stiffer spring in the left front, the wheel weight of the right rear will increase. The opposite corners effect each other, no matter what type of suspension.

Also, the preload adjustment on Caltracs have an effect as well.

I had King Race Cars scale my 69 Camaro a couple years ago. He heated and bent one front coil to get the rear wheel weights about equalized. I'm sure that I recorded the corner weights in that year's log book. If you are interested in knowing the numbers, send a PM, and I'll dig out the books and try to find the info.

bob gonier 03-28-2009 07:49 AM

Re: Scaling F-Body GM
 
Quote:

Originally Posted by Tony Curcio (Post 111894)
Also, the preload adjustment on Caltracs have an effect as well.


Yes It will/does but Calvert doesn't recommend doing so.






bob

67champ 03-30-2009 04:24 AM

Re: Scaling F-Body GM
 
Thanks for the replies everyone!

dt

Tony Curcio 04-02-2009 09:36 PM

Re: Scaling F-Body GM
 
Off the trailer the corner weights were as follows:

LF- 956 RF- 910
LR- 811 RR- 706

After raising the LF spring rate 50 lbs, the rear wheel weights were about equal, then the Cal-Tracs were re-set according to mfr instructions:

LF- 1006 RF- 863
LR- 756 RR- 772*
*16 lbs preload

Pistol Pete 08-13-2013 09:54 PM

Re: Scaling F-Body GM
 
Quote:

Originally Posted by Tony Curcio (Post 112879)
Off the trailer the corner weights were as follows:

LF- 956 RF- 910
LR- 811 RR- 706

After raising the LF spring rate 50 lbs, the rear wheel weights were about equal, then the Cal-Tracs were re-set according to mfr instructions:

LF- 1006 RF- 863
LR- 756 RR- 772*
*16 lbs preload

Why would you want 143lb. difference between LF & RF ????
I'm guessing the driver is in the car with these wt. numbers ??

Tony Curcio 08-13-2013 11:43 PM

Re: Scaling F-Body GM
 
Yes, 220 lbs in the driver's seat. The front weights are not critical on a drag car. The object was to get some balance on the drive tires.

Pistol Pete 08-14-2013 02:12 AM

Re: Scaling F-Body GM
 
OK Thanks Tony.


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