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Author Topic:   New racer, be nice.
number55
Dirt Full Roller

Total posts: 27
posted June 09, 2004 10:06 PM  
Stupid question

1200rf
1100lf
250rr
200lr

rf=right front etc. got that part, but not sure what the numbers actually represent? Got a 79 (or so) street stock camaro, new on the race scene. We have the stock spring in the front left, replaced the front right with a new spring for a Z28. In the back stock multi leaf with about 3" lowering blocks. 3/8 track, any ideas?

racerguy500
Dirt Maniac

Total posts: 168
posted June 09, 2004 11:28 PM  
The numbers you posted are the spring rates. Meaning to compress the spring 1" it takes "x" amount of force. So a 1200 pound spring compresses 1" with 1200 pounds force applied to it. You have to know what you are getting though, some manufacturers rate them from free height to 1" of compression, and some measure already compressed 1" to the next inch of travel, hope that helps and good luck.


number55
Dirt Full Roller

Total posts: 27
posted June 10, 2004 08:05 AM  
Is there a way to find out or measure what the stock spring rates are so I know what I have? (Besides getting 6 guys to sit on the fender)

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted June 10, 2004 08:30 AM  
Easiest way is to find someone with a spring rate checker. Or if you have a set of scales and a hydraulic press you can put the scale pad on the press and set the srping on it the use the press to compress it 1" take a reading then go another inch and take a reading. Subtract the two and thats your spring rate. This can be dangerous but can be done.

number55
Dirt Full Roller

Total posts: 27
posted June 10, 2004 08:38 AM  
Spring rate checker, pricey item?

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted June 10, 2004 09:16 AM  
Very pricey item.

Springs on a used car are tough, because the only way you can really know what you've got (if you lack a rater), is to buy them new yourself. Usually aftermarket racing springs are have their rates stamped on them somewhere.

[This message has been edited by WesternAuto17 (edited June 10, 2004).]

zeroracing
Dirt Forum Champ
Total posts: 1875
posted June 10, 2004 10:14 AM  
try to find a local late model or mod guy that has one, or a local speed shop that will check them for cheap.
i heard the owner of afco say one time that an accurate spring checker cost abotu 10,000 bucks. so if you use a cheaper one like most people have you could be a few pounds off but it should get you close.

number55
Dirt Full Roller

Total posts: 27
posted June 10, 2004 10:54 AM  
Alright we'll see what we can do with that then, does anyone happen to have an idea what a stock 79 camaro's spring rates might be all around?

number55
Dirt Full Roller

Total posts: 27
posted June 10, 2004 10:55 AM  
One other thing, keep the front sway bar or loose it?

Flanndad
Dirt Freak

Total posts: 255
posted June 10, 2004 11:52 AM  
Stock Camaro springs are going to be around half of what you need.

A good set of shocks and springs will be well worth the investment, but it will be around $500 when done.

15a
Dirt Freak

Total posts: 354
posted June 10, 2004 12:10 PM  
How much does the Camaro weigh and what size tires and rim width do you use? How flat or banked is the track? This information would be needed to "head you in the right direction".

carolinafast
Dirt Full Roller

Total posts: 72
posted June 10, 2004 04:38 PM  
also if you find a good late model guy
he might check your springs or sell used ones
cheap...but they might be too short for you rules....it is well worth the money to buy new stuff if at all possible

number55
Dirt Full Roller

Total posts: 27
posted June 11, 2004 08:57 AM  
15A, we have 86's on the right and 82's on the left on 8"wheels. The track is 4/10ths of a mile. 450' straights with 12 degree banking. Oh and the weight of the camaro is ballpark 3370lbs or so.

juliaferrell
Dirt Freak

Total posts: 370
posted June 11, 2004 02:01 PM  
Also you have to count leverage effect. One inch at the coil is not one inch at the wheel. When you use extended a arms and ect you need to allow more spring rate for them. If you space a wheel out or decrease the offset you have changed the effective rate needed. Center of the contact patch to the vertical centerline of the coil. Their relationships to ride height are synonomous but not equal.


15a
Dirt Freak

Total posts: 354
posted June 12, 2004 02:02 PM  
If you have to run "stock appearing" springs try 900-1000 with a trim to fit spacer on the left front and 1000-1100 w/spacer on the right front. With these springs you can loose the front sway-bar. If you can use aftermarket rear springs try 200-225 across the rear. Some like the heavier on the left.
If you have not, invest in some real racing shocks (Afco,Pro)Try switching the tire size around. 4 inches of stagger is alot across the rear. Move rims around on the car with different backspacing to help handling as the track surface changes.

    

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