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Author Topic:   Weight jack, air pressure ??
Rat Trap
Dirt Maniac

Total posts: 129
posted August 16, 2004 02:10 AM  
I'm still learning to drive, but this weekend i made my 1st A Main, man what a blast i had in the B Main. You guys have helped me out alot mainly just reading post more so than posting.

Were running a 3 link with RR spring on top and LR in front. In the heat the track was still wet and we had a push (wont turn)problem from middle to exit. In the B Main it was lots of fun, i could turn and run low and only slightly pushed. Come the A main it had gone more dry slick and the push was there again. What adjustments to the weight jack screws should me make in the pits between the races? Or are we looking at it wrong? We're thinking more RF and less LR to get the push out

cd2
Dirt Maniac

Total posts: 161
posted August 16, 2004 07:38 AM  
RatTrap,You can't put more weight on R.F. & take weight of L.R.It just does not work that way. Try 1/2 - 1" more stagger & reset your wheel weights back as they are now & see if you get the results you want .If not then try a stiffer spring on the R.R.& reset the weights.How does the car enter& go around? cd2

mod70
unregistered Total posts: 161
posted August 16, 2004 09:30 AM           send a private message to cd2   Edit/Delete Message   Reply w/QuoteBBBBBB
cd2's sugestions should help your problem, but there is something even eaiser you can try. Pull your RF offset in 1 or 2 inches. I was fighting a bad mid off push and went from a 2" to a 4" and it curred the problem completely. Good luck.

Rat Trap
Dirt Maniac

Total posts: 129
posted August 16, 2004 04:04 PM  
So your saying that adjusting the weight screws does nothing? Ok now i'm confused a bit. Well try what you said though. It enters good, its just when i get back in i go up the track. I've tried not entering as fast, throwing it in and what i usually have to do is get in and out of the gas to keep from going over the top. We've got 150 spring on RR and 175 on LR. The RF is a 750 and LF is 650. We have considered that the rear springs might be to light though. If we tried a heavier RR spring, how much heavier and should we change the LR spring at the same time?

mod70
unregistered Total posts: 129
posted August 16, 2004 04:12 PM           send a private message to Rat Trap   Edit/Delete Message   Reply w/QuoteBBBBBB
The reason cd2 said not to add cross (add weight to RF) is because that will only make a push off worse, not better. Adding it to the LF won't help comming off because that wheel is doing very little if no work comming off the corner. Increasing the spring rate on the RR will remove cross which will loosen on exit, but may also tighten on entry. Increasing the spring rate across both rears is a good idea, and may solve the problem. You are not too low now, but going up will free the rear end some. (as will decreasing rear %) If you increase the rears I would sugest going to a 225 LR & 200 RR.

2nd2none
Dirt Forum Champ
Total posts: 755
posted August 16, 2004 04:23 PM  
I was watching sat. night. Increasing your rear springs will probably help alot. 150#RR at 81 is just too soft. We run a 200# on the RR of Jarvis's car, 225# LR.

could you give the percentages, springs, shocks, wheel offsets, ride heights, and are you leading the LR or RR or is rearend square?


edit: when you adjust 1 corner of the car with the weight jacks, it affects the opposite corner as well. if you put 1 round in the RF you will increase the LR weight. 1 round in the LF will increase weight on the RR.

[This message has been edited by 2nd2none (edited August 16, 2004).]

Rat Trap
Dirt Maniac

Total posts: 129
posted August 16, 2004 04:40 PM  
2nd,,i went and looked at our set up sheet. here what we have. The shocks are AFCO
LF 650# spring, 3" offset, 95 afco
RF 700# spring, 3" offset, 94 afco
LR 175# spring, 4" offset, 94 afco
RR 150# spring, 4" offset, 94 afco

LR leading RR by 1/2"
Ride height is 5 1/2" left and 6 1/2" right

We don't have any scales this year so we don't know what the percentages are. We have tried different offsets on the LR and RF when the rims got tore up. We don't want to get to carried away on buying new rims this year, because we have a 4.5 bolt pattern and are going to the more common 5 on 5 for next season. How do those shock numbers sound also. Thats what the car had when we bought it, but wonder about those also.

[This message has been edited by Rat Trap (edited August 16, 2004).]

2nd2none
Dirt Forum Champ
Total posts: 755
posted August 16, 2004 05:23 PM  
If you want later this week you could bring your car over to our shop and I can scale it for ya. Its really hard to chase the handling on a car if you dont know where it scales out at.


Rat Trap
Dirt Maniac

Total posts: 129
posted August 16, 2004 05:32 PM  
2nd,,,,check you pm

2nd2none
Dirt Forum Champ
Total posts: 755
posted August 16, 2004 06:03 PM  
check your pm's

MikeN
Dirt Full Roller

Total posts: 27
posted August 24, 2004 01:18 PM  
If you can't get it on scales. You may want to raise the panhard a bit. Also, you
could try to put some lead on the right front. I will put in more cross, but should effect the front more when it rolls. Also, I know nothing about the track or your car, but I would try bringing the panhard down more for the feature. If the track is slick, and flat, it may be a lack of side bite on both ends causing the push when the track is black. How does the car roll now?

Rat Trap
Dirt Maniac

Total posts: 129
posted August 24, 2004 11:21 PM  
We got it on the scales tonight. We will see how she does this weekend.
Thanks again 2nd2none for helping us out on this.

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