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I have seen some threads about the weight split between front tires, and I know what the base line set up calls for on my car. But I was wondering about the effects of Cross Weight. In what situation would you want an even split across the front tires, or a heavier RF than LF? In what situation would you want a Cross % to be 52% or 53%, as opposed to the base line of 50.5%?
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Crew Chief "Tip of the day":
Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well. -
The split in the fronts/ cross weight varies with amount of left side % for a set bite and rear #. -
I know that.Originally posted by jedclampit View Post
My question was. When would you want a heavier RF than LF. Or a cross % of 53% instead of 50.5%.Crew Chief "Tip of the day":
Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.Comment
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If you increase your cross% to 53% and don't change left% or rear%, you will have to have also increased LR bite.
Cross% and LR bite are mathematically linked. If you change one the other has to change unless you change left% and/or rear% at the same time.
The same concept is true for LF/RF split.
So if you get your LR bite where you want it and then go messing with the LF/RF split and DON'T change left% or rear%, your LR bite is going to change also.Comment
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when you add cross, you're placing more weight on both lr and rf, which plants those wheels more when your car is riding on the springs. If you run a 4 bar, your lr changes will mainly have an effect off throttle, and to a much lesser extent on throttle. RF changes will have an effect both on and off throttle. so you want to add/remove cross with RF when you want to effect your corner middle/exit.
the same works with lf/rr weights (and shock adjustments). LF affects off throttle running on springs, and to a much lesser extent on throttle depending on how much hike you get. RR effects both on/off throttle.
I know that doesn't specifically tell you what to do, but look at where in the corner you want to adjust the car, and you'll figure out what to try.Comment
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I don't know why I didn't just PM you in the first place haha. Thanks.Crew Chief "Tip of the day":
Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.Comment
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Always good to have others look at what I say to make sure I'm right (which i'm not sometimes, lol).Comment
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Whenever communicating with another fellow how can we safely assume he/she is or is not applying throttle? A spring may take varied forms but rates are measurable. I believe the advantage to thinking in terms of cross wieght rather than wedge is the fore thought that front needs attension simutaneously. How would one measure pressure applied to rear &/or front tires when the car is upon the vertical supports/lifts;bars?Comment
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