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Author Topic:   Help..Car is Loose On Dry Slick.....
hsracer58
Dirt Full Roller

Total posts: 46
posted June 27, 2004 09:38 PM  
Weve been running fairly well. here is my setup, and Then will discuss problem. Car weighs 3000# w/o driver. Cross is 52.8%, rear is 47%, left is 53%. I'm running a rf 950 spring, lf 750, rr 200, lr 250. Run the big front sway bar, with a cut left side link. Run 2" stagger in front, and 3" in the rear. Run left side wheels as close in as I can, and the rights are stuck out ( 2" BS ) The track is a 3/8 banked oval, and is tacky for heats Lately been very dry slick for feature. This past friday car was very loose in the feature, the worst it has been all year. In the heats car is wicked fast and sticks like glue. How can I tighten it up for feature, we don't have time to change front springs, so that is out, what else can I do. Will taking out the stagger tighten it up that much? Any other suggestions would be good.

Thanks
Rick

udecide66
Dirt Freak

Total posts: 229
posted June 27, 2004 10:09 PM  
first of all what kind of car is it, I,m assuming a metric. second how much banking is the track, high medium low?
I have never ran more than 2 inches of stagger on the rear.
I used to run steet stock (now mods) but still help out my friends with thier street stock.
I would say drop your rear stagger to about 1 1/2"-2"
How much left rear bite are you running?
with that much cross I assume well over 130
I would say that if you are over 115 pounds that is the loose going in problem and the high rear stagger is making you even looser coming out.
Try running 90-100 LR bite and less stagger.
you may want to add some ballast to the rear to get more rear % maybe add a 100 pounds to get 50% or so.
On our super dry slick track the ideal setup is this (for a metric car)
52% rear (or more)
52-53% left
49-50% cross 100# LR Bite
car usally weighs around 3300 total w/driver
One more thing is what shocks are you running?
Is your track rough or smooth?
Since the car is fast for the heat race, you may just want to change wheel off sets for the main, maybe try switcning rear wheels, put your 4" backspacing on the right and the 2" on the left, but be sure to keep your stagger the same. By changing the wheels it will decrease cross weight and LR bite.
give us some more info, the above is just some quick thoughts.

hsracer58
Dirt Full Roller

Total posts: 46
posted June 27, 2004 10:16 PM  
It is a metric 83 monte. Track is medium banked. My scales don't tell me left rear bite #'s. If your 130, or 115 #'s are in reference to rear spring split, it is 162. Also, can't add any weight to car.Shocks are pro adjustables. Left side rear firm, right rear set in middle. What exactly will sticking the left rear out and sucking in the rr do? I have seen guys doing it, but was told by oldtimers to do the opposite.Thanks,if you need more info let me know

Rick

[This message has been edited by hsracer58 (edited June 27, 2004).]

[This message has been edited by hsracer58 (edited June 27, 2004).]

Raz_900
Dirt Forum Champ
Total posts: 635
posted June 28, 2004 07:23 AM  
quote:
Originally posted by hsracer58:
[B]It is a metric 83 monte. Track is medium banked. My scales don't tell me left rear bite #'s. If your 130, or 115 #'s are in reference to rear spring split, it is 162. Also, can't add any weight to car.Shocks are pro adjustables. Left side rear firm, right rear set in middle. What exactly will sticking the left rear out and sucking in the rr do? I have seen guys doing it, but was told by oldtimers to do the opposite.Thanks,if you need more info let me know

Rick
B]



If you put the LR farther away, it will give the left side more 'leverage' about the middle of the car. Right now, you have the right side out so it has more leverage trying to loop the car making you loose. If you give the left side more and the right side less, it will tighten the car up and try to push it the other way (into the wall) which is what you want.

At my track, (hard, dry, slick, med. banked big 1/2 mile) Running the rears even (measured from frame out to tire) and with zero or 1/2"-1" reverse stagger works very well. Any positive stagger results in a nice view of the inside wall. 3" of stagger is way too much on a dry slick.

340duster
Dirt Maniac

Total posts: 195
posted June 28, 2004 09:47 AM  
hsracer58 -

Is the car loose under power on exit or loose on entry? If it is loose on entry is it loose under braking or just under coasting?

If it is loose under power (acceleration) look at rear stagger as the main issue. I would try to get that down to 1" or less for the dry slick. The other serious issue would be rear weight percentage. If you can add ballast you will need to get creative with adding weight. You should try to get it above 50% rear. Look at adding a heavier bumper etc. Most books say not to add weight behind the rear end, this is good in theory but you are dealing with a very nose heavy car. To get the car to 50 % would require adding hundreds of pounds above the rear axle. It will take much less at the bumper to achieve the same.

If it is loose under braking likely too much rear brake

If it is loose under coasting likely too much stagger, too soft RF spring or too stiff RR spring.

If it is loose under braking then you may have too much rear brake

fastrack1
Dirt Maniac

Total posts: 145
posted June 28, 2004 07:21 PM  
Soften the rear say 200lr 175 rr go up to 950 lf 1200 rf you are unloading the rears so till when you apply the gas it is to stiff to transfer rear weight quickly and cause what we call squat get rid of the the sway bar also .

Scorpion
Dirt Newbie

Total posts: 1
posted July 10, 2004 09:47 AM  
We run on a dry slick track every night! My car has a 2-off on the left rear at all times.
During the heat race we run 3-off on the right rear.
Before the Feature I take the 3-off, and replace it with a 4-off on the right rear. It seems to tighten the car up...and it is easy to make the change in the pits.

mod70
unregistered Total posts: 1
posted July 10, 2004 01:01 PM           send a private message to Scorpion   Edit/Delete Message   Reply w/QuoteBBBBBB
Well, I'd like to add something to help you, but you've gotten some really good advice here. I would defenatly add rear %, take some stagger out of the rear, and move rear offs to the left to move your rear roll center left. Good luck.

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 10, 2004 01:19 PM  
less rear stagger less rr pressure and tuck the rr in keep it simple and probably less right foot if your not use to dry slick

    

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