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  lr spring to the rear

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This topic was originally posted in this forum: Modified Tech Talk
Author Topic:   lr spring to the rear
FASTLAP
Member
posted April 17, 2004 04:40 AM     Click Here to See the Profile for FASTLAP     
I was just wondering if anyone could tell me how to change from lr spring in front of axle to behind while at the track... I was curious if there was some basic rule of thumb to keep things the same or should you really do it at the shop?


Ego Racing
Member
posted April 17, 2004 10:08 AM     Click Here to See the Profile for Ego Racing   Click Here to Email Ego Racing     
Is your rear spring on a birdcage? We start with the spring on the rear on the cage for the heat race. When the track dries out we move it to the front and remove it from the birdcage and bolt the spring mount to the axle clamp this loads it on acceleration at restarts and slow starts off of the corners. With the spring in the rear on the birdcage it looses wedge when the rear reacts to acceleration. It will loosen a chassis that is to tight.


Ego Racing
Member
posted April 17, 2004 10:10 AM     Click Here to See the Profile for Ego Racing   Click Here to Email Ego Racing     
The bigest thing to remember is to get the car as flat as possable measure from the rear to the frame. When you move the spring get the chassis back to that measurement.


FASTLAP
Member
posted April 18, 2004 08:00 AM     Click Here to See the Profile for FASTLAP     
Thanks Ego, that's the only thing I could think of for a quick change at the track. I noticed last night at out track that the lr clamp (that's what I usually run) lacks a little bit of forward bite compared to the spring behind. Next question is, how much left rear # do you guys run with the spring behind. I have no clue where to start at. Thanks in advance.


Chad
Member
posted April 19, 2004 05:38 PM     Click Here to See the Profile for Chad   Click Here to Email Chad     
As a quick rule of thumb reference, I usually measure the distance from the top of tire to the bottom of the rear fender on the LR (while the car is on the ground), mark the spot on the fender where I measured, and write the measurement on the fender. This will give you a ride height number to measure to after making the spring swap. This is what the asphalt guys do to keep their ride heights straight while making spring changes. I do this on each corner of the car in the shop after the car has been scaled. This makes it easy to make changes at the track without getting the ride heights and setup out of whack.


NJantz
Member
posted April 20, 2004 06:19 AM     Click Here to See the Profile for NJantz     
thanks for that idea Chad.


FASTLAP
Member
posted April 20, 2004 08:22 PM     Click Here to See the Profile for FASTLAP     
.....never thought about doing that.... thanks Chad!


2nd2none
Member
posted April 20, 2004 08:48 PM     Click Here to See the Profile for 2nd2none   Click Here to Email 2nd2none     
In a perfect world situation you could spend 3 days on the scales changing out every spring combo on every corner and record how to get back to your normal setup with each change, IE.. number of turns in or out to set the ride height back and correct amount of wedge.


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