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Author Topic:   ????Stiff or Soft Rear Springs?????
DWorks_05
Member
posted July 09, 2003 11:24 AM
I was just wondering how many of you guys run stiffer than 200 lb springs on the rear??? I have always been under the impression that softer springs give you more bite in the turns and more roll. This past weekend we just experimented with stiffer springs (4BAR) and it made my car react alot more and rollover alot harder. It really didnt make sense to me why this is soo. Can anyone explain it because this is on a slick track that doesnt hardly change any week to week.


uforacing51
Member
posted July 10, 2003 03:14 PM
I have heard of cars running a 300 on the LR and a 250 or 225 on the RR. I am still learning about setups and can't really explain it any better than you. I am waiting to see what other posts come up here.


dluna
Member
posted July 10, 2003 05:17 PM
The way I have had it explained to me is that if you go too light on the springs they will use all of that rear chassis weight that you work so hard to get, and just COMPRESS, instead of remaining strong enough to push the rear tires into the ground.
I guess you have to find a happy medium for every car.

I could be way off, but makes pretty good sense to me.

GRTWallbanger
Member
posted July 10, 2003 05:54 PM
GRT WALLBANGER we had LR-225 RR-175 and the car was decent but not a rocketship and we were just tryin something different to see how it worked on a real dry slick race track so we went from that above, to LR-275 RR-225 and the car just reacted alot quicker and better. We have tried real soft springs like 175 and 150 and the car just doesnt seem to hook up good. I dont know but dlunas reply makes sense. Thanx for the replies though.


BigBlueFord
Member
posted July 11, 2003 07:30 AM
I was discussing this this with our chassis builder and they told me that if you go to soft on the rear springs you'll end up losing forward bite.

We're currently running 250 and 275. I was only talking about going to 225 and 250 combo when he brought up the subject of going too soft on the rear springs.

The comment above about how the chassis/suspension is trying to drive the rear tires into the ground under acceleration and if you don't have enough spring you lose the effect of the down force make a lot of sense to me. Hadn't really thought about it that way before. Good comment. Thanks


rocketwildone
Member
posted July 11, 2003 01:16 PM
Are you running the LR spring behind the rear-end?I also tried the 275 on the RR and 225 on the LR.Thats what i meant when i said stiff RR spring.Seemed to tighten car up by loading the LR more?


DWorks_05
Member
posted July 11, 2003 05:13 PM
Yea we run just a typical 4bar setup just like what u are talkin about. spring behind on the lr and the spring in front on the rr. rocketwildone u said that u had 275 on the rr and 225 on the lr. on what part of the track did it tighten the car up.


GRTWallbanger
Member
posted July 11, 2003 08:25 PM
softer springs only slow the reaction in the corners,you can do that with shocks if you are carefull.we run 275 & 250,on 4-z , with short pan or j-bar, looks like a dog with it's leg hiked up through the corners and is so hooked up it runs out of motor now!b.t.w., 1998 d-w 8 with uni-mount rear suspension on 1/4 mile track.


scooter11
Member
posted July 13, 2003 07:37 PM
dont know about a d-w 9,but on the 8 we are using the longer bars that you'd find on a d-w-5'17 on left lower,second hole from bottom,at about 3-5*,13 inch upperat 20*,aand 17inch upper and lower on the right,upper pointed back at 2*,and the front pointed forward at 0*.just put it on at mid-season,car is lightning fast,almost too much forward bite.tons of side bite also.


scooter11
Member
posted July 14, 2003 09:54 PM
Ok guys, now you've got me wondering about our car. Does this same principle hold true for a two link? We started last year with a 200# on the LR(in front of rearend),& a 175# RR(behind rearend)with a spring pullbar. The car was perfect. This year changed pullbar to a biscuit type,(rule change in our limited mod class), & the car was junk( no roll at all in corners). Went to a 225# LR & car was alot better, but have to run a boat load of LR (175-200#)to get it off the corners with out melting the tires down.(Track is dry every weekend). This is with 58.5% rear. I'm no expert, but this just don't seem right to me. Would running a stiffer RR help our problem also? Thanks.


dirtywrench13
Member
posted July 17, 2003 06:44 AM
u may want to move your springs,l.r.to the back of the axle,r.r. to the front,if your rules let you.everyone i talk to uses this,its more affective on dry slick.


scooter11
Member
posted July 19, 2003 11:44 PM
Where are your bars set at? Do you have enough angle in your j- bar or pan-hard bar? Try swapping your front spings so that the rightis lighter than the left. This will allow more roll steer. The left upper bar on the 4-link is the key. try raising it up on dry-slick. What we have found on our 1/3 mile slightly banked oval is small changes are making all the difference in the world. Get that thing to roll over but keep the left front on the ground to control roll steer.


scooter11
Member
posted August 04, 2003 09:03 PM
The lr upper bar is in the 4th hole from the bottom, the lr lower bar is in the third hole from the bottom, the rr forward bar is in the 2nd hole from the bottom and the rr rear bar is at about 5 Deg. J-bar is at about 8.5" up on frame and 2nd hole from the bottom on the pinion. Just looking for a little more forward bite.

[This message has been edited by scooter11 (edited August 04, 2003).]

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