Re: Rear coilover shock spring rate?
[Re: Scotts71chall]
#1584575
02/26/14 04:43 PM
02/26/14 04:43 PM
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Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
BJS racing
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
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Do you have any idea what the rear axle weight is? I would guess that a 125 spring would put you pretty close but with out knowing for sure on the weight its just a guess.
Back in the swing of things at Painless again! Great to be back!
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Re: Rear coilover shock spring rate?
[Re: Scotts71chall]
#1584578
02/27/14 01:18 PM
02/27/14 01:18 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I really wish I had more info, the car is very apart now. Im guessing 3700 - 3800 pounds when done.
I would think there would be many guys running B & E body cars with big blocks and 4-links or ladder bars with coilover shock setups?
Maybe they just don't remember what spring they have on. I wanted to get them with the summit discount.
The 3700-3800 isnt gonna help much.. you need to know
the rear weight... then subtract the unsprung weight
then see what they want for the manufacturers design
height for the shock... for the general spec its
5/8 of the stroke inside the shock.. set the bottom
spanner up 1" and if the spring is right it will
drop down in to that 5/8 point.. if its within 1"
you can adjust that.. if its greater then you need
to change the springs.... as a GUESS the 125#-130#
should be real close.... if the body isnt setting
at the height correctly then you move the bottom of
the shock to get it right... dont just crank up the
spanner(you would be going out of the design height)
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Re: Rear coilover shock spring rate?
[Re: BJS racing]
#1584582
02/27/14 04:22 PM
02/27/14 04:22 PM
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Joined: Aug 2003
Posts: 43,173
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
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My NHRA legal A/S 1970 Baracuda 426 Street Hemi weighed 2160 lbs on the front tires and around 1280 lbs on the rear with no driver and a 1/2 tank of gas. That car was a original 383 4 speed car that had a K member and engine out of a 1968 Hemi Road runner, E body Dana 60 rear, Shaker hood and no roll bar, stock front and back seats, no console,no heater or radio Them babys are way nose heavy   I help another couple that raced a 1970 Challenger R/T that we put a street hemi motor in it also to run NHRA legal A/SA, it had similar weights on the front and back tires IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rear coilover shock spring rate?
[Re: 493_DART]
#1584587
02/28/14 03:08 AM
02/28/14 03:08 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Interesting thread for me.... i had traction issues (soomtimes) last summer with my new ladder set up. Guess what springs? 150 lb.
i have a new 125 lb set sitting here to try this April 
If you have 150s on it now and you measure the design
length(eye to eye) I'm sure that its longer than
it should be... in that case you could be topping
them out which causes the loss of traction... on
some days the track might be better and those are
the days you probably lost traction
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Re: Rear coilover shock spring rate?
[Re: 493_DART]
#1584589
02/28/14 03:20 AM
02/28/14 03:20 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
it would get worse as they day went on and also if it got hot out.
Usually it would dead hook hard the first 1 to 3 passes...then start spinning slightly the rest of the race day
The first few runs it was planting the tire hard enough
to set the tires and the shocks worked good at that
point... did you ever loosen up your shocks when
it would spin... maybe just 1 or 2 settings
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Re: Rear coilover shock spring rate?
[Re: MR_P_BODY]
#1584590
02/28/14 11:41 AM
02/28/14 11:41 AM
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Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
MoparBilly
master
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master
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
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What we learned over the years is that you want just enough spring to hold the back of the car up, then adjust the shock setting for traction and control, it works great at the track as too heavy of a spring negates the shock adjustments.
Then, if you REALLY drive it on the street, like Drag Week for example, and you have a buddy with you, and possibly some luggage, or spare parts, it's going to beat you, the shocks, and the suspension to death in about 300 miles because the springs simply can't control the weight under adverse driving conditions! I learned this lesson at DW 2011, and my brother suffered the same problem at DW2013. So if you truly intend to use it on the street, you might want a set of 150 or 160s to slap on in that situation.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
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Re: Rear coilover shock spring rate?
[Re: MR_P_BODY]
#1584591
03/01/14 04:33 AM
03/01/14 04:33 AM
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Joined: Jul 2004
Posts: 4,384
Worst Weather USA
493_DART
master
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master
Joined: Jul 2004
Posts: 4,384
Worst Weather USA
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Quote:
Quote:
it would get worse as they day went on and also if it got hot out.
Usually it would dead hook hard the first 1 to 3 passes...then start spinning slightly the rest of the race day
The first few runs it was planting the tire hard enough
to set the tires and the shocks worked good at that
point... did you ever loosen up your shocks when
it would spin... maybe just 1 or 2 settings
oh believe me... i tried everything... cant wait to try my new 125 lb springs.
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