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Author Topic:   set-up questions
STREET16
Dirt Maniac

Total posts: 158
posted April 12, 2004 06:05 PM  
I broke down and bought a set of scales. Now I need some help understanding what they are telling me.
LF 924lbs,1000lb spring,p235r7015,3"b/s,16psi
RF 833lbs,1200lb spring,p235r7015,3"b/s,18psi
LR 899lbs,275lb spring,p225r7015,4"b/s,16psi
RR 665lbs,200lb spring,p235r7015,2"b/s,18psi
Total 3330lbs
Left 1831 lbs 55%
Rear 1569 lbs 47.1%
Cross 1734 lbs 52.1%
I have a spring rubber in the left rear and a 60lb weight behind the right rear tire. the car is raced on a 3/8 oval with 8 degrees of banking.
What can I expect the car to do? And any recommendations would be appreciated. Thanks.
Car is 1986 monte carlo

[This message has been edited by STREET16 (edited April 12, 2004).]

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 12, 2004 11:18 PM  
so should he soften the LR spring to a 250# or a 225#, for a little more weight back? Maybe more weight in the back? I heard of some guys throwing somewhere between 100#-200# in the back on dryslick...

longracing25
Dirt Freak

Total posts: 217
posted April 13, 2004 12:04 AM  
maybe pull out that rubber also...lol..sorry if that sounds kinda nasty ladies...

STREET16
Dirt Maniac

Total posts: 158
posted April 13, 2004 07:10 AM  
The car had trouble getting forward bite last year, that's why I added the weight. I'm thinking about adding more. I am a bit concerned about the left front weighing more than the right front (jack and socket days) and the 200+ lb difference at the rear. Thanks.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 13, 2004 07:09 PM  
Ya, that 275 LR spring isn't doing you any favors. I'd pitch it for a 225.

Rather than add more weight, can you move anything to the rear? Where's the battery? Can you put it in the trunk? Just getting the battery behind the RR tire will get you about a 1% change. Having a 240 lb split in the rear is a bit much, but can work.

Don't worry about the front. 100 lbs is a good starting point. Last year I had about 10lb more on the RF than LF and it was tight going in. This year we moved some things around to get the LF about 50 lb heavier than the RF and it's leaps and bounds better.

STREET16
Dirt Maniac

Total posts: 158
posted April 13, 2004 11:30 PM  
I dropped 120 lbs in the trunk, it brought the rear percentage up to 50%. Pinion angle is 10 degrees down. I can't really gut anymore legally and the battery is already in the trunk. I think I have a 225 for the left rear, but it'll be thursday before I can put it in. These weird work hours are killing me. Thanks again.

[This message has been edited by STREET16 (edited April 13, 2004).]

RCRacing #08
Dirt Maniac

Total posts: 121
posted April 14, 2004 05:32 AM  
Put the 225 in the left rear and took out 70lbs of the added weight. 49% rear weight. decide to give it a shot. I had no forward bite in the heat race - the track went dry slick. Moved the right rear tire to the left rear. Put a 235r70 15 on a 4 inch back spacing on the right rear (took out the stagger and offset rears to the left). The car hooked up and went like a scalded dog - until the motor let go. I was expecting forward bite problems on the feature but the car got better grip than almost everybody. It's the best the car has handled in a long time. Thanks.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 17, 2004 01:01 AM  
Why so much pinion angle? Witha suspension similar to yours we only use 2 to 4 degrees with about 52 percent rear. Feel you may be losing a ton of power there. Just trying to halp a fellow racer.

longracing25
Dirt Freak

Total posts: 217
posted April 20, 2004 01:01 AM  
You want the weight to shift back on that RR, just make sure you don't have stock axles back there. Put simple, tuck the right rear tire under, stick the left rear tire out, use the stiffer of the 2 springs on the left rear as well as a split valve shock..so it can try to drive that tire down into the ground also. Run the right rear tire out , and the left rear tucked in..if the track is sloppy. Most drivers i know, just leave it set-up for the dry slick though.They usually don't care to switch the offset around, better things to do with your time...

DSMFANATIC
Dirt Forum Racer

Total posts: 90
posted April 25, 2004 07:30 PM  
correct me if i'm wrong(which i'm sure will happen) but isn't it a general rule of thumb to run the same set-up on a dry slick as you do on a sloppy track and change for a tacky,heavy track?

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dan ferry
Dirt Maniac

Total posts: 183
posted April 28, 2004 08:11 PM  
yep

STREET16
Dirt Maniac

Total posts: 158
posted April 29, 2004 04:46 AM  
You would think so, but they watered the track down real good this week and the car was junk. I don't care if I have to add 200 lbs in the trunk, I have to plant the rear tires. I am thinking about putting the spring rubbers in the front(1 each side) and dropping the rear one inch on each side. Not racing this week, so I should have some time to play with it. Thanks.

cd2
Dirt Maniac

Total posts: 161
posted April 29, 2004 07:48 PM  
street16 If you do not have an angle finder go to lowes,home depot or sears and get one it is about 12.00 or so. It is a round face deal with one flat side an has a pointer that will turn so you can read diffrent degrees.Place this on your rear trailing arms an raise the ride height on the rear so you will have 8-10 degrees of angel from where they bolt to the rear up to the chassis an this will help a lot on foward bite. The upper arms on top of the rear we useally set them about 10-12 degrees down to the front an set pinion angel 2-4 degrees.If you have weight bolted on L.S.to get the 54.89 % you might move 30 pounds too the rear an this will help.With the low rear % you might need to go up on your crossweight also.If your R.R.tire was bigger than your L.R.an the car hooked up better with reversed stagger this indicates not enough crossweight.When you lower the car in the rear an flaten out the angel on the trailing arms you take out lift & foward bite. On the monte & chevell chassis i set the ride height on the front where side rail turns in toward center at 6 1/2 - 7 " an the rear straight down from where the trailing arm bolts to frame 2" higher than front these measurements will be from floor to bottom of chassis. cd2

cd2
Dirt Maniac

Total posts: 161
posted April 29, 2004 07:57 PM  
street16 also i think you should run the 4 " offset on both L.F & L.R. an run 3" on both R.S.the way you have it now the center track on the rear is to the right of the front an this helps to make the car loose.

STREET16
Dirt Maniac

Total posts: 158
posted May 08, 2004 07:06 AM  
I put a spring rubber in each front and dropped the rear 2", and added 120lbs to the right rear. Got the rear to 51%. Track went dry-slick again, in the heat, good forward bite but the car was really loose. Moved 40lbs from right rear to left rear - car was hooked up. overall result - MY FIRST FEATURE WIN AND FIRST CLEAN SWEEP. THANKS to everyone for the help.

bobaluuu
Dirt Freak

Total posts: 474
posted May 08, 2004 08:56 PM  
ok guys help me out. We never have a dry slick trk but I thought to correct a loose condition on a dry slick trk one would add right rear weight up hi and pull some stagger? just wondering.

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