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Author Topic:   Dumb Question about percentages
Fastride 38
Dirt Maniac

Total posts: 125
posted October 06, 2005 12:50 PM  
I'm only asking because it was a argument last night in our shop and I didn't feel like rolling out the scales to see who was right. Now, I'm not going to say who was saying what I'll just hit yall with the same question.

If you screw both front weight jacks IN three turns equally on both sides will it produce more nose weight or more rear weight?

zeroracing
Dirt Forum Champ
Total posts: 1875
posted October 06, 2005 01:07 PM  
Well on your scales it should to none. The weight jacks only effect the cross weight. The dont effect the overall front to rear.
By adjusting the front around you will never get any noticable effects. If you do then your probably just finding a bind in the chassis and unbinding it or worsing it.
BUt short answer for all practical purpose screwing the front in on both sides wll not effect the nose or rear wieght at all.
Jacks are just for cross/wedge in the car, not the front to rear or left to right.

Kromulous
Dirt Forum Champ
Total posts: 796
posted October 06, 2005 01:28 PM  
I dont know if i buy that or not Zero.

Our car is always nose lower than the rear, and all other cars i see are rear lower than the front, then i ask what a couple i know are running for rear % and its 58-60%. We set up on 53-55% depending on tires.

Our cars are pretty much identical. I'm gonna have to get the scales out to find out.

I believe you would see a slight differnece, the rear would get heavier, a little bit, if you added 3 turns.

[This message has been edited by Kromulous (edited October 06, 2005).]

wfoondirt
Dirt Forum Champ
Total posts: 505
posted October 06, 2005 02:02 PM  
You would have to raise the front end several feet to notice any change. Which coincidentally is one way to find the cgh of a car.

But for any useful purpose there will be no discernable difference from a one inch change in ride height.

psycho47
Dirt Full Roller

Total posts: 48
posted October 06, 2005 02:32 PM  
I also thought the weight jacks would only effect cross. They dont effect front to rear or left to right.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted October 06, 2005 02:44 PM  
If you keep your wheelbase and wheel track width the same, the only way to change rear % or left% is to physically add or remove weight.

Kromulous
Dirt Forum Champ
Total posts: 796
posted October 06, 2005 02:52 PM  
Hmm, you learn something everyday.

Thankfully this meg board exists, or i would be really lost, LOL.

Krom.

dluna
Dirt Freak

Total posts: 334
posted October 06, 2005 03:45 PM  
That's why when scaling out the car, I always get the LS% where I want it first, then get the REAR% where I want it...re-check LS%, making sure I keep my ride heights where I want them the whole time. That is when I add or remove lead / fuel to hit those two percentages. Then I'm ready to get my CROSS% where I want it and don't have to worry about LS% and REAR% changing at all. Your ride height may change by a small margin to get the desired corss%, but I don't know of any way to get around that.

[This message has been edited by dluna (edited October 06, 2005).]

Fastride 38
Dirt Maniac

Total posts: 125
posted October 06, 2005 04:59 PM  
Well at least I see this is a topic worth discussing. I figured it would add weight to the front more than the rear. Causing the front to bite more and causing a loose in condition. But, I guess even I didn't know. Thanks guys for the info....But I don't think this shop "discussion" will end till I put it on the scales.


So to continue on does more nose weight make a car looser in or does it make it push because of the weight? Or (LOL) does it go back to driver perference/style?

[This message has been edited by Fastride 38 (edited October 06, 2005).]

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 06, 2005 08:04 PM  
If everything else stays the same and all you do is increase the front % then Yes it will loosen the car.

wfoondirt
Dirt Forum Champ
Total posts: 505
posted October 07, 2005 06:49 AM  
Less rear percent will loosen exit and entry if enough brake is used. It will tighten mid corner.

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