lOOkatme said:
if you start with 500lbs on each rim fully slammed.....and you jack the rear up. the front tires will have more like 650 on the front two...cause the back is pushed up and its slanting more weight on the front wheels. if you have the same spring rates...the weight transfer will be the same...BUT you trying to move weight up hill with the car jacked up in the rear...its not going to transfer as well....also the car has a lot further distance to travel to even get even.
hahahaha...I can't believe superhonda has degenerated so much that a moderator would completely bullshit to make himself seem right, and then be adamant about it. From looking around the site, you seem to know your basics pretty well...but don't assume that means you know the more advanced concepts of suspension design as well.
Yes, I've had physics. Quite a bit of it actually. In fact I've had 2 interviews these past two weeks...one with daimlerchrysler and one with honda research...for the job of chassis engineer. I would really love to see you "crunch these numbers" and find that you're right...because you would disprove everything currently known about springs and weight transfer.
OK....first of all. We won't even talk about weight transfer yet. We'll just talk about the corner weights when the car is sitting there before the race. Imagine that the car body is just resting on top of hte springs, and you lift it up off the springs. Then you slowly let it down. Assume equal rate springs in front and rear, and equal height (and that the car has an equal weight distribution to make it easier to see). There are scales under each wheel.
Scenario 1: You slowly let the car down onto the springs, each spring compresses the same amount, and each scale measures the same amount. No surprise there.
Scenario 2: You lift up the rear springs 2". Now put the car down slowly. At first, it only touches the rear springs, so ALL the weight is on the rear tires, correct? You keep going until it gets onto the front springs....NOW the front spring starts getting weight onto it. The front springs do not have to compress as far as the others, so they have less weight on them.
So the front wheels will have less weight on them before going. Then...when you DO drop that clutch and hit the gas....you get more weight transfer to the rear because of the higher center of gravity because half the car's raised. I already explained that in a previous post...if you want me to dig through my textbooks and find the formula for weight transfer so you can crunch some numbers I will...but I know it only involves wheelbase on the bottom of the equation, with center of gravity, weight, and acceleration in the top.
So lOOkatme...like I said, raising the rear is great for rwd cars, but fwd's are completely different. If I'm missing something (which is possible), please enlighten me with something reputable or at least logical.
oh and xlr8: You just want to have the whole car pretty low. Raising the front will put more weight up front, but will also increase weight transfer to the rear, so i'd just keep it low.
Now, yes...some of the extremely fast fwd cars do have a lower front than rear. I believe this is basically just to get as low cg as possible, since weight transfer becomes more important and worth curb weight losses when you have such crazy accelerations. Reason they only lower hte front and not rear is because weight is still transferring to the rear and they want to keep it off the ground and such. But keep in mind, they still want the rear as low as possible...
Hope that helps some people really understand...
