Visit The Dirt Forum for More Information

Author Topic:   Base line set-up
STREET16
Dirt Maniac

Total posts: 158
posted September 29, 2005 08:37 AM  
I am looking for a good base line set-up For a 3000lbs 72 chevelle chassis with original type suspension and weight jacks. Left side weight, rear weight, cross weight, and rear bite. Thanks.

STREET16
Dirt Maniac

Total posts: 158
posted October 03, 2005 08:52 AM  
These are the numbers I have right now are (with driver)
LF 825lbs, RF 615lbs, LR 811, RR 811, total 3062 (2745 without ballast - all ballast behind rear axle), left 53.4%, rear 52.9%, cross 46.5%. Spring are LF 1000, RF 1200, LR 225, RR 175. Wheels are 2" backspacing except RF which is 4" backspacing, 1 3/4" stagger in rear. Track is a 3/8 mile, tight turns, and good banking (Southern New Mexico Speedway in Las Cruces NM). Ran the car for the first time Saturday night, It was REAL TIGHT on entry and would snap loose on exit. I figure the loose exit is caused by the tight entry. I figure I need to bring up the cross weight and get some more weight on the right front. Any recommendations would be appreciated.

[This message has been edited by STREET16 (edited October 03, 2005).]

DJR22
Dirt Maniac

Total posts: 111
posted October 03, 2005 12:29 PM  
4" backspace on rf?

------------------
-stand on it-

beachracing
Dirt Forum Racer

Total posts: 94
posted October 03, 2005 12:32 PM  
Put a 2" wheel on the right front, even up rear springs to 225 on both sides, and adjust with stagger. Try to lighten up the front of the car at all costs. Get your entry taken care of first, then adjust for exit once the car is steering well. The more rear percentage on a tacky track calls for more stagger, otherwise your going to push like a freight train. Take the 4, or a 3", and depending on roll out(inner fender rubbing, install on right rear. You may have to cut, clearance, and box frame the rear horn to eliminate tire rub. Getting the car to turn through the turns should be the #1 priority, otherwise the car will push on exit, which makes that jersey barrier wall at SNMS come up a whole lot quicker. The 2" on the right rear for wet/tacky will help it turn, but as it dries, tuck the right rear in.

STREET16
Dirt Maniac

Total posts: 158
posted October 03, 2005 01:19 PM  
OOPS! I got the backspacings backwards - it's 4" except for the right front which is 2". 1 3/4" stagger was the most I could get with the tires I have. I'm going to get some new ones before next year. I just moved up to the super stocks and the scale numbers are not like anything I've ever seen with a street stock. Thanks.

DJR22
Dirt Maniac

Total posts: 111
posted October 03, 2005 06:05 PM  
Could try more front caster split to help corner entry. Like beach said, get your front weight down as much as possible, and then get workin with those weight jacks.

------------------
-stand on it-

Normal Sullivan
Dirt Full Roller

Total posts: 39
posted October 04, 2005 10:46 PM  
Seems to me that increasing your crossweight % to around 51% would get you in the right place with a minimum of fuss....

STREET16
Dirt Maniac

Total posts: 158
posted October 05, 2005 07:00 PM  
Thanks Normal. With the season over, all I have to go by are what the scales tell me. We were aiming for 53% left, 53% rear and 50% cross, but 46.% cross was the most we got before loading up for the race. I'm going to try some different springs and see what happens to the percentages. I'm thinking about moving the 1000 to the right front and putting a 750 or 800 in the left front. Also planning to try what Beach recommended if I have another 225.

Normal Sullivan
Dirt Full Roller

Total posts: 39
posted October 06, 2005 04:00 AM  
Just one other thing. Obviously more rear weight percentage would be an advantage, but sometimes that's tough to do on a finished racer without adding overall weight. You aren't so far off that this should make the car evil through the turns. It might help to know what rear stagger you're running, and how much caster split you have out front as mentioned earlier.

beachracing
Dirt Forum Racer

Total posts: 94
posted October 06, 2005 04:04 PM  
I would suggest a sway bar if you are going to run that soft on the front. You might also want to run some front stagger if your using street tires. Is it for street, or supers. If you run streets, weld the jack in place(or remove it), or use water pump pulleys with the center cut out to get your spring height. Test it, and when you feel you have the right height, tack weld them, and they will be legal. Caster settings is something you will need to do on a playday, and I beleive our first one is in december. Make sure you have all the tools to make adjustments, and do it in small increments, and also write your changes, and note the effects of the changes as well.

STREET16
Dirt Maniac

Total posts: 158
posted October 07, 2005 10:47 AM  
It's a super stock - totalled my street stock at the Mike Joselyn Memorial race. I've been looking at different sites about what spring changes to make to loosen up the car. Day Motorsports and Dirt Works say to soften the right front and GRT says to stiffen the right front. My experience says to go with GRT. It felt like the front was skating - not rolling over at all. Which has me thinking that the front springs are both too stiff.

beachracing
Dirt Forum Racer

Total posts: 94
posted October 07, 2005 12:17 PM  
What are your ride heights? If the car is too low it will limit roll. What type of shocks are you using? Are you running goodyear short track specials? Your skate problem might be a car that is too tight.....if it has a considerable push on exit. What does the car do on entry, (especially middle), and exit.

[This message has been edited by beachracing (edited October 07, 2005).]

[This message has been edited by beachracing (edited October 07, 2005).]

    

Back to the Archives