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Author Topic:   wheel spacers
AC156
Dirt Full Roller

Total posts: 40
posted July 01, 2001 04:48 PM
This may be a stupid question, but i am new at this. What exactly do wheel spacers do? I know that they make the wheel stick out farther, but how does that affect the handling of a car?

hesseracing
Dirt Roller

Total posts: 18
posted July 04, 2001 10:41 AM
im not sure what spacers do as far as handling but i only run one on the rr to keep the tire from rubbing. depending on the car u should be able to run 3 in offset on dvr side and 2 in on pass side then possibly need spacer on rr only. hoped that helped scott

LITTLEMAN
Dirt Forum Racer

Total posts: 82
posted July 04, 2001 11:11 AM
Wheel spacers an excellent way to tune your handeling.Moving your right rr out will loosen your entry and tighten your exit or moving your left rear in will do the same thing.moving your right front out will loosen your entry and tighten your exit.moving your left front in will loosen your entry or get rid of a slight push in the center of the corner.

Racer0
Dirt Roller

Total posts: 20
posted July 06, 2001 09:19 AM
I am not am expert at this by any means, and if someone else knows better please correct me. However, I reas in a Steve Smith book that moving out a tire on one side by 2" will transfer approx. 25# to the opposite side of the car. Therefore, on wet or tacky tracks you would want to move out the rr tire creating more forward bite,and moving out the lr on dry slick tracks, creating more side bite. My home track gets very dry during the feature and moving out the lr tire helped out very much. Hope this helps.

jammin
Dirt Administrator

Total posts: 3279
posted July 09, 2001 03:06 PM UIN: 16262997
Any time you move a tire away from the car, you lose weight on that wheel, if you move it toward the car, you gain weight. Your crossweight is affected also. If you gain weight on your RF by moving a tire in, then you also gain weight on the LR and you lose weight on the LF and RR. That is something that is very easily seen on the scales. That is why you can manipulate your setup so easily with air pressure, it gets you back to the same situation, but with spacers, you can magnify your changes.

jammin

[This message has been edited by jammin (edited July 09, 2001).]

Sidebite
Dirt Forum Racer

Total posts: 96
posted July 09, 2001 04:27 PM
More changes occur than meets the eye. Aren't you also effectively changing LS/RS weight distribution? For example: Say I have two tires of identical circumference on 3" offset wheels on the rear of my car. Now if I put the RR on a 4" offset wheel (tuck it IN 1-inch) and put the LR on a 2" offset wheel (stick it OUT 1-inch). That is just like moving the entire rear-end to the left 1-inch right? Everything else remaining equal, this should tighten the car because the rear is now Left of center to the chassis. Does this make sense or am I all wet here?

jammin
Dirt Administrator

Total posts: 3279
posted July 09, 2001 04:35 PM UIN: 16262997
No, you wont affect left side weight. If you want to change the left side or right side or front to rear of the car, you must manually move weight in the car. Adjusting the cross will not do it.

Sidebite
Dirt Forum Racer

Total posts: 96
posted July 10, 2001 11:29 AM
I know that in most cases you must physically move weight to change left to right or front to rear percentages. But if you are adding spacers or using different offsets then you are also changing track width. This will affect left to right percentages as well as cross. If you only change one wheel, the effect will be minimal and hardly noticeable.

Look at it this way, lets say your starting front and rear track widths are 60". If we could put a 4" spacer on both the RF and the RR then the new width would be 64". You have changed Left to Right percentage without moving ballast because the chassis and all associated weight is 4" farther away from the right side tires.

For a little more info, check out this paragraph from http://www.hardtopracing.com/articles/tech/tracksetup.htm

"WHEEL OFFSETS. Changing wheel offsets can greatly affect a racecar. By changing wheel offsets, you can change the left-side weight bias in the car, add or subtract side bite and change track width of the car. The relationship of the right-side wheels to each other affects how a car drives off the corner. If the right rear is inside the right front, the car tightens; if the right rear is outside the right front, the car loosens. If you need more side bite, you can move the right rear in, which causes the weight to transfer more quickly to this tire. Moving the left-rear out will cause the rear end to drive toward the infield, thereby tightening the car. Keep in mind, however, that when changing wheel offsets, you also change wheel weights, so you must compensate by readjusting your jackskruz."


[This message has been edited by Sidebite (edited July 10, 2001).]

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