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Author Topic:   Changed spring rate
iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted June 24, 2004 04:21 PM  
we changed the spring rate on this new car and went from
175rr
200lr
and went to
150 rr
175 lr
to try to get better bite well it worked but lossed the car up on entry
we are running 1 inch stagger in the front and none in the back 3 1/2 off on the rr and 4 inch on the lr two inch off on both fronts
35 lbs both right sides and
25 on both left sides
front springs are 1200 rf and 950 lf

turnleft43
Dirt Full Roller

Total posts: 38
posted June 24, 2004 05:45 PM  
The 1 inch stagger on the front is ok. You may be able to do some wheel swapping to get this combo and tighten up the car some. LF 31/2",LR 2",RR4",RF2" The front spring split should be somewhere around 100 lbs. The tire pressures will have to do with the weight of the car and if your allowed to use beadlocks. As far as stagger in the rear some suggest at least 2 inches if you can get it. hope this helps.

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted June 24, 2004 06:54 PM  
Ok what will happen if i add stagger wont that lossen it up MORE going in thats that way i have always done it was if the track was wet then i added stagger and when it was dry i took it out
We cant run bead locks and i dont want to lower the air pressures on the right side plus we dont have weight jacks either

mike10az
Dirt Forum Racer

Total posts: 98
posted June 24, 2004 07:32 PM  
you can fix the car being loose by swapping your wheels with the 4 off on the left year you have the tire tucked under neath the car and the drive center of the car will change by moving the 4 off to the right rear (you should be able to do this since you can't run beadlocks anyway) and putting one of your two offs on the left rear you will tighten the car up noticeably. more stagger will loosen the car up, you could try taking the stagger out of the front and putting it on the rear.

What kind of race track are you running on?? Is it high banked? Have you ever had the car Scaled if so how much left side weight and how much rear % all these things will help.

[This message has been edited by mike10az (edited June 24, 2004).]

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted June 25, 2004 04:05 AM  
the car has never been scaled so there is one problem there
The car is excellent on exit but it needs to just be tighter on exit and throught the middle would a 4 off rf help?

cd2
Dirt Maniac

Total posts: 161
posted June 25, 2004 09:14 AM  
iowa_dirt_track_girl You can stiffen up on the L.F. an this will tighten the car in & to center. Here is the problem on the spring i can't tell you which one to use but check the height from the floor to the bottom of the chassis on the L.F.an you will have to use the lenght that will put this height back as original.This way you will only change spring rate & not C.W. & i would try to get the spring to come out around 1100 # Exp.you might have to start with a 1000# spring an keep cutting it to get the height back right an end up with a 1075,1100 or 1125.Hope you have a spring checker.Also you can change back to the 175 on the R.R.& tighten up some getting in.As for the R.F. if you will not bottom out you can change it to a 1050 & tighten in also but you probley do not have jack bolts on the car to reset ride heights & C.W. so just try the L.F. for now.If you know the rate of your spring you can divide the rate by the number of coils to see how much each coil carries & this can help to choose the spring that you want to start with. Try this one change an post results. cd2

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted June 25, 2004 11:00 AM  
Thanks cd2 i will try a stiffer left front and yes i do have a spring rater
I really would like to stay as soft as i can cause i cant get any more then 47.9% rear weight (we scaled it this after noon)
Thats why i put softer springs in the rear to tightne it up on exit plus help the car roll back more comming off the corner thus giving it more bite
Hope iam thinking this right cause all i did was change the springs rates and it loosen the car up on entry and throught the middle but when i had them other springs in there it was awsoem but couldnt get enough bite comming off
I will let you guys know next wendesday thanks guys

cd2
Dirt Maniac

Total posts: 161
posted June 25, 2004 10:13 PM  
iowa_dirt_track_girl You could put the springs back like they were & use the stiffer L.F.& if the car gets a little tight in & a little loose off put a 225-250 in the L.R.& you might have to use a smaller L.F.tire .If the L.R.spring change upped your ride height a little this will add C.W.& this will help & the small tire will also add some.As i said in the earlier post if you shortened the left front spring so the ride height stays the same the C.W. will stay the same.If your L.F. ride height is 7" with a 950# spring an you use a 2000# spring cut so the height is back to 7"Then the crossweight is the same. But the car might not turn going in because the L.F.& R.R.will carry the weight going in an pin the R.R.so hard the car can't turn. cd2

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted June 26, 2004 10:58 AM  
Ok but will that help with bite off the corner???

cd2
Dirt Maniac

Total posts: 161
posted June 26, 2004 06:54 PM  
iowa_dirt_track_girl Yes it will help with bite off. At the track if you still need more bite off change L.R. to 250 an this will give more bite off,or you can cut your rear stagger in half an see how this works. Might have to do both depending on how dryslick the track gets.Just keep in mind about the L.F.spring lenght.If you try this please post results or give me a private mail. Thank's cd2

mike10az
Dirt Forum Racer

Total posts: 98
posted June 27, 2004 11:47 PM  
less rear stagger will tighten the car up on entry and moving your tires (with wheel backspacing) left will tighten the car up on acceleration.

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted July 03, 2004 09:25 AM  
Ok i put 50 lbs of weight under the battery box and left all the stagger out and went back to the 200lr and 175 rr springs and man was we fast won the heat by half a track and got third in the feature cause ii couldnt get up where i need to be for the feature but adding that weight help out a ton

[This message has been edited by iowa_dirt_track_girl (edited July 04, 2004).]

    

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