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Rear weight percentage on short wheelbase

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Nitro hillbilly:
Roo, what kind of weight percentage should be on rear wheels on 115" wheelbase dragster? I have weight scales available. Under 300hp stick shift.

rooman:
Unless you are willing to move the motor or add ballast what you have is what you get. Does it wheelstand and if so how badly? Does it go straight if and when it is carrying the front end? If it is rotating violently at the hit it may need some ballast or a different launch technique but there is no hard and fast rule as to the ideal weight distribution as combinations vary so much.

Roo

Nitro hillbilly:
I'm in the building process. So I can move the motor were it needs to be in moderation. Thought there might be a rule of thumb. I figured you might have had to rework a car or two.  Looking for wisdom.

rooman:
Usually I put the motor 42"-45" out in a 200" plus car but have also built them at 36". Once again it is all dependent on your overall package. If you run a hard compound 8" tire it is more likely to leave with the front end on the ground than if you have a sticky 14" wide deal.  Under 300hp and 115" is a small part of the equation as there are a lot more variables that will have an effect.

Roo

PSweeney:
I ran a 115in wb slingshot with 280bhp and 4sp.  With the manual box, the car will wheelstand no problem, so if this is your thing, have a robust front end end that wont bend on landing.  IF you want to stop it wheelstanding get as much weight forward as you can, battery, fuel, weightbars, filled tube axle.  If you run a wheelie bar it needs to be long and flexible or sprung so that its progressive in its action.  A fixed bar on a manual car will unload the tryes as you hit the bar hard on the launch.  If you don't want it to wheelstand at all run a tall gear.

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