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Author Topic:   dry slick adjustment
Istock66
unregistered Total posts: 36
posted March 28, 2005 02:40 PM           send a private message to fastmod5   Edit/Delete Message   Reply w/QuoteBBBBBB
I race a nova Imca stock car.

For dry slick track conditions Ive been adding 100 lbs.

Last race I added 100 to the rr rail, and put a easy comp, tie down shock on the rr. 4010 bilst shock.

I also went to easy ups on both fronts.
2060's.

The car was really fast to transfer wt to the rr and pulled the lf up really bad when on the throttle down low where there was still some bite. It was impossible to drive anywhere but the very bottom also as it was so twitchy or uncontrolled from the easy shocks.

My ? is would I be better off adding the 100 to the lr?

Also would I be better of with the easy comp\tie down shock on the lr than the rr?

Thanks Jeff

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 28, 2005 03:16 PM  
Why would you add 100 lbs help you i dont get the idea behing add weight to go faster.

Blind Barney
Dirt Maniac

Total posts: 120
posted March 28, 2005 04:37 PM  
My experience as short as it is would be to take 100 from the left and put it on the right without 'adding' any.

Istock66
unregistered Total posts: 120
posted March 28, 2005 06:01 PM           send a private message to Blind Barney   Edit/Delete Message   Reply w/QuoteBBBBBB
I rade at 56 rear and add the 100 to get to 58 rear percent.

Seems like moving from left to right would pull the lf up even more??

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 28, 2005 06:14 PM  
You guys put way to much stock in percentages. It is a static measurement and you are throwing it in a dynamic world. Scales are good to get your baseline and be able to repeat it. But come one once again you are add weight to a car that is alreay heavy and your goin to race me who is light and understands that raiseing and lowering the car is better then throwig 100lbs on it. You can get a 3000 lbs car to do what you want it to do with out adding any weight on it. Istock to answer your question raise the car Raise it higher then you ever have before. When you throw it in the corner and if feels like it will tip over on itself then leave it there. Tippy is always fast. If it is rocking over it is fast. It is when it doesnt rock over that you go sliding like a dump truck in december in upstate new york. If that doesnt give you a visiual that you can understand your lost.

AtomicPunk
Dirt Maniac

Total posts: 130
posted March 28, 2005 07:26 PM  
So, Sidebite, would a "soft" set up also give you the same type of weight transfer? We run a dry-slick 3/8 that usually stays smooth.

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 28, 2005 07:34 PM  
it depends how soft it is. THere is a term called Historieces It means im simple teams you bounce a car it comes back to one point you bounch it again you would like to to come back to the same point. If you have the car set to soft it doenst return to the same spot. to stiff it doesnt go to the same spot. two things contorl this spring rate shock rate if your track is smooth you want o have no tweak of the week shocks cause you dont really need then to control compression and rebound. what controls weight transfer in this smooth track is the spring rate. you want enuff so when you gas it coming off the corner the car wants to wheel stand. when you stuff it in the corner it wasnt to flip its self over. To answer you rquestion NO but it also is what is soft.

[This message has been edited by sidebiteu259 (edited March 28, 2005).]

Istock66
unregistered Total posts: 56
posted March 28, 2005 07:52 PM           send a private message to sidebiteu259   Edit/Delete Message   Reply w/QuoteBBBBBB
Sidebite I dont know if you read the first ? or are just responding to the fact that I add 100 lbs??

My car rolls plenty to the right, thus the reason the left front tire wont stay on the ground!!!!!

I think its rolling too much to the right there is barely any lr tire wear on dry slick, I think its practically unloading.

Atomic punk is your car a leaf spring car?

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 28, 2005 08:52 PM  
Answer for the first question leave the weight off period. second slow the time the weight transfer in your shock rate. slow your timers down it may just do what you want it to do. Throw a 5 shock on what is the worse that can happen

Istock66
unregistered Total posts: 56
posted March 28, 2005 09:10 PM           send a private message to sidebiteu259   Edit/Delete Message   Reply w/QuoteBBBBBB
I run a 5050 on the rr when its tacky and wet, that loosens the car up as needed then.


te33
Dirt Freak

Total posts: 237
posted March 28, 2005 09:14 PM  
move your tiedown to the left rear,throw the hundred pounds in the truck,and make sure your right rear is not bottoming out.on a leaf car,you can go over so far that the shock will bottom out ,making for a very sketchy ride,it won't do same thing twice,loose to tight to loose in one corner.if you must put the weight in put it on the left rear.both tires should have heat,some in the left,more in the right.as for the left front,get that tire on the ground,4 are way better than 3!if the car is tight i would not hesitate to hang 35-45 pound over the left front.see what it does.there are a lot of chassis wizards on here,and i have no doubt they have there cars working good,but it's like my dad has told me for 25 years,don't give the car what YOU think it needs,give it what it's asking for,even if you are sure its wrong,it's just a car it will TELL you what it needs,don't out think yourself!stick to the basics,the chassis works in an x,get all 4 tires to work,handling will trump horsepower every time,light is fast,and make sure to put some gas in it!

Istock66
unregistered Total posts: 237
posted March 28, 2005 09:32 PM           send a private message to te33   Edit/Delete Message   Reply w/QuoteBBBBBB
the shocks arent bottoming out, got that covered.


My heat is very uneven in back.

Ill put a easy up on the rf only and easy down tie down on the lr and not add the wt next time and just add gas!!

thanks

Jeff

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 30, 2005 04:27 PM  
adding the weight is a good thing. I'd go back to basics and run 40/40's across the rear and 50/50 on the rf and 40/40 on the lf... what spring rates are in the car and how much rear percent are you at without the 100 pounds... the other thing you might consider is putting a 4" offset on the rr and a 2" offset on the lr when it goes dry

RACINREBAL6410
Dirt Full Roller

Total posts: 43
posted March 30, 2005 05:35 PM  
SIDE BIT CHECK YOUR Private messages

jercer2004
Dirt Roller

Total posts: 12
posted March 31, 2005 06:06 AM  
I would take the easy up (split valve i'm assuming) off the left front. and put a straight 75 on it. you dont want the weight trasfering to the right rear as quick as the left rear. This is the shock package i'd use on a dry slick Afco #'s RF. 76-2,LF.75,RR 94,LR 93-5. As far as the weight goes keep it as close to the CG of the car and to the left of it. Hope i was some help....Good luck with the racin.

Istock66
unregistered Total posts: 12
posted March 31, 2005 06:20 AM           send a private message to jercer2004   Edit/Delete Message   Reply w/QuoteBBBBBB
thanks,

I went to a practice tuesday night.

I moved all my lead 250# down 13 inches.

ran 5050 6060
3030 3030 shocks

and the air pressure and heat in the tires was really good, as well as the travel at all 4 corners was right on.

Before with all the wt high, the rs shocks traveled 5-6 inches.

Im going to only add lead if needed after a couple trys with diff shock combos, and wheel offset first. And then Ill add it to the left and high only. Easy ups will allways be easier on the rf than the left. Same with shocks in the rear, Ill try to keep it on the left first.

Thanks for all the advice and ideas, Ive got a good plan in stages of what to do now for diff track conditions.

2870
Dirt Roller

Total posts: 14
posted March 31, 2005 06:22 PM  
we tried for 2 years to pull weights out, on our dusty sandy dry slick track.
At some very dry track u need the weights, at others leave them in the truck.
We ended up with a rear % close to yours. Don't forget the cross(wedge), raise it up too. A little more front brake helps if adjustable u don't want to be loose in.

Kent
Dirt Maniac

Total posts: 102
posted April 01, 2005 01:38 AM  
If ya have your percentages in the ballpark you can tune it in by changing your air pressures and put a larger offset on the left rear and that will really tighten up your car! I drop my tire pressures about 3 to 4 psi and add offset to the left rear and the change is incredibly noticable! Able to hammer down all the way around the track! Give it a try. By adding weight to your car I would think that you are just creating more problems.

AtomicPunk
Dirt Maniac

Total posts: 130
posted April 01, 2005 07:34 AM  
Istock- Sorry this is so late, haven't been to this board in a while. To answer your question: No, my car is a Metric coil. Leafs and coils behave differently, but are surprisingly similar in some respects. I started out in a leaf and when our track went IMCA went to the metric. We ran about 180# in the trunk as low as possible. About 140 was over the lr and 40-50 right center. Played a lot with pressures and offsets. I understand that weight=hp, but the dryer the track got the more weight we added, the faster we got.

    

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