Not Sure......

[Mod66x]

Not sure we're to ask, so decided to ask here! When scaling a car or truck for dirt does cross% play any part of the process? Or just worry about lr bite and your left% and rear%. Trying something new on dirt and not sure we're to start. Full frame (3 x 4 frame rails), 2x3 front and rear clips (rear is ovER rail), 3 link with steel tube qc, 5x5 hubs, weight is 2800 with driver and no lead. Added 90 lbs to right frame to get 54.6 left% rear is 52.1%, LR bite is 105.
Lf spring 500 rf 550
Lr 250. Rr 225
Any recommendations. ....

[TheJet-09]

Cross % is typically something you only hear referred to in the asphalt world, at least from my experience. In dirt you'll usually hear/talk about left side%, tail weight (rear %), and bite (amount LR is heavier than RR). Where and what are you racing (a Sportsman type car? Tires? Engine?)? Is it coilover or conventional type springs?

[Mod66x]

15 x10 steel wheels on Hoosier D-35s, coilover, 355 with Holley 500cfm carb, will be running in a sportsman division until division grows (if it does), T-10 trans with 3 disc clutch. 1/2 mile track semi banked. This was a South East Super Truck(asphalt)...

[drtrkr244]

I have converted an asphalt mod to dirt so I have a little exp with this.I would swap those front springs, because ur going to need to be much tighter.I would also increase rear % to 54. Try moving the lead as close to the rearend as possible, even right behind it, if that's what it takes.You can start with that and then look at raising motor/fuel cell if you don't get enough side bite. Good luck!

[bob75]

cross is lr bite

[hpmaster]

Back in the day, I was told by CJ Rayburn that crossweight was to be within 2 or 3 percent of your left side weight. If he still believes it or not I do not have a clue. One of my older still very competitive friends swears by 2 percent MORE than left side numbers, he has raced pavement and dirt for over 30 years now. I have not worried about crossweight in years.

[Matt49]

cross is lr bite

Partially true. More of one certainly means more of the other but how the numbers correlate differs depending on left% and rear%.
Cross% actually makes way more sense to track as it takes the entire weight of the car into account where as "bite" doesn't.
In other words, 100 lbs of bite in a 2300 pound car will provide VERY different handling characteristics than in a 2800 pound car.
If you keep the cross% the same...not so much...

[Mod66x]

How is cross also lr bite? When cross is a combination % of rf and lr of total weight and lr bite is the difference of weight between rr and lr....

[Matt49]

Assuming total car weight is the same, more bite=more cross and more cross=more bite. There's no way to make just one corner of a car heavier without adding weight. And even just trying to add weight to one corner usually results in changes to the opposite corner.

If you saw down one leg of a table, the opposite leg is the one most affected by it.