Scaling HELP !!! - Page 2

Dennis424C · 02-08-2013, 04:35 PM

It was 100#'s heavy on the left with no pre-load and me (driver) in it. I understand how the pre-load works and I am trying to get the scaling correct with the bars loose or no pre-load. I will check all the spring perch and mounts again but I think it just might be a weight issue. If all checks out I will add 30lbs to the right rear and report back. Thanks for the suggestions

Lee Jordan (3223) A/S · 02-09-2013, 08:45 PM

Are the rear brakes disk or drum? Make sure the brakes are in good shape or this could steer the car with the front in the air. Have someone film it from the rear and study the car that way too. I would also start with making sure the rear is square in the car.

Larry Hill · 02-10-2013, 11:07 AM

Had this happen to me. Right rear shock at full extension was .75" shorter than left rear shock. At the hit, rear would separate enough to pick up right rear tire causing car to turn right. This would only happen in very good weather or in a heads up race. We were lucky to find the problem with the help of the local track photographer. We only had to fix a hole in the oil pan and had to fix two front wheels on the Cuda.

rod · 02-10-2013, 06:04 PM

check the axle housing to verify that it is, in fact, straight and true. this must be toe-in and camber. a lot of cars have bent housing and the driver does not realize it. especially 12 bolts, as they are weak, being three piece units. even when welding the tubes to the center, they bend. I just checked a 9" Ford and it was out almost 3/8" toe and a little less than 1`/4" camber. makes you wonder.
next make sure there is no rear brake drag [regardless of type].

Rod in AZ

02-08-2013, 04:35 PM	#11
Dennis424C Junior Member Join Date: Dec 2007 Location: Dayton, TEXAS Posts: 34 Likes: 4 Liked 2 Times in 2 Posts	Re: Scaling HELP !!! It was 100#'s heavy on the left with no pre-load and me (driver) in it. I understand how the pre-load works and I am trying to get the scaling correct with the bars loose or no pre-load. I will check all the spring perch and mounts again but I think it just might be a weight issue. If all checks out I will add 30lbs to the right rear and report back. Thanks for the suggestions __________________ Dennis "The Menace" Clark 424C Pro E/T 424C S/ST H/R S/G

02-09-2013, 08:45 PM	#12
Lee Jordan (3223) A/S Member Join Date: Jul 2011 Location: Kentucky Posts: 105 Likes: 191 Liked 55 Times in 17 Posts	Re: Scaling HELP !!! Are the rear brakes disk or drum? Make sure the brakes are in good shape or this could steer the car with the front in the air. Have someone film it from the rear and study the car that way too. I would also start with making sure the rear is square in the car. __________________ 1967 Fairlane A/Stick - 1994 Mustang GT. 1989 Oldsmobile, R/SA - 2016 Z06 Weekend Street Car.

02-10-2013, 11:07 AM	#13
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,640 Likes: 1,940 Liked 10,714 Times in 2,230 Posts	Re: Scaling HELP !!! Had this happen to me. Right rear shock at full extension was .75" shorter than left rear shock. At the hit, rear would separate enough to pick up right rear tire causing car to turn right. This would only happen in very good weather or in a heads up race. We were lucky to find the problem with the help of the local track photographer. We only had to fix a hole in the oil pan and had to fix two front wheels on the Cuda. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817 Last edited by Larry Hill; 02-10-2013 at 11:36 AM.

02-10-2013, 06:04 PM	#14
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 315 Likes: 0 Liked 20 Times in 15 Posts	Re: Scaling HELP !!! check the axle housing to verify that it is, in fact, straight and true. this must be toe-in and camber. a lot of cars have bent housing and the driver does not realize it. especially 12 bolts, as they are weak, being three piece units. even when welding the tubes to the center, they bend. I just checked a 9" Ford and it was out almost 3/8" toe and a little less than 1`/4" camber. makes you wonder. next make sure there is no rear brake drag [regardless of type]. Rod in AZ