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Author Topic:   Two shocks on right rear
Dirt Roller

Total posts: 24
posted June 09, 2005 08:55 PM  
I have heard of some guys running two shocks on the right rear. They call one a dummy shock. What is this all about?
The guys that is running it sure are fast.

Dirt Freak

Total posts: 318
posted June 09, 2005 09:00 PM  
that is when you run coilovers you need a shock to hook the spring too and if you want the spring in the front and the shock in the back you need a dumby shock.

Dirt Roller

Total posts: 24
posted June 09, 2005 09:11 PM  
This is what somebody said on another web site.What do you all think?

1 is a real shock the other a dummy= 0 re bound and an 8 valving on compression=keeps the car up on the left rear links longer and is smoother to drive when you have to lift the throttle. Forward bite.......................... enhanced

Dirt Roller

Total posts: 24
posted June 09, 2005 09:14 PM  
The two shocks are on left rear not the right as I stated on the first post.

Dirt Forum Champ
Total posts: 755
posted June 09, 2005 09:42 PM  
if you are running a 4 link with the live shock/spring behind and you want to run 2 shocks you put the 0/0 shock/spring on the back and put the live shock up front. This will calm the car down by slowing the rate at which the birdcage will index.

Dirt Roller

Total posts: 24
posted June 09, 2005 09:54 PM  
When you say run the o/o shock and spring do you mean the dead shock 0/0 inside the spring?

Dirt Full Roller

Total posts: 33
posted June 09, 2005 10:19 PM  
The dummy shock is just acting as a eliminater, i believe.

Dirt Freak

Total posts: 209
posted June 10, 2005 02:36 AM  
we will regularly run the live (valved) control shock with spring on the back of the lr birdcage and run the 0 valve (dead) shock on the front side but with an extension. this is to stop the car from "jacking" so far that the birdcage can flip over centre and get caught up on the bars.
even though it is a 0 valve shock, it does still offer a small amount of resistance too.
some guys will run a chain to limit the travel instead.
it is also a standard setup on a banked, high speed track to run the setup as 2nd2none stated with the spring mounted on the dead shock, on the back and the live/control shock on the front with an extension.

Dirt Forum Champ
Total posts: 796
posted June 10, 2005 06:09 AM  
Alot of LM's will run a straight 4 valve coilover on the back of the birdcage on the LR, and then but a 0 rebound 9 comp on the front.

The front shocks keeps the car up on the bar, and the rear shocks assists. As well the rear shock controls the rebound.

So basicly, without figuring arm lengths to mounting points, your running a 13 comp / 4 rebound.

One of the reasons i read that they run the front shock with out any rebound is that the shaft speed of the shock is to fast on the front of the BC (indexing BC). So it makes the shock seem stiffer thant it really is. Putting the shock on the back allows you to have better control of the rebound (slower shaft speed).

Same deal on compression, the BC indexes into the front shock, plus the car settleing back onto it, so it acts stiffer than the rear shock, as well the shaft speed is higher inturn making the shock seem alot stiffer than it is.

Dirt Freak

Total posts: 357
posted June 10, 2005 08:26 AM  
We run two shocks on the left rear of our late model one is a compresion only and the 2nd is rebound only. This allows us a wider range for comp. and reb. plus you have double the amount of oil and nitrogen in each shock. From begining to end of race shocks will only increase 10-15 deg. in temp. Never fade stays the same from start to finish of race.

Dirt Freak

Total posts: 243
posted June 10, 2005 11:54 AM  
I think I would protest this set up on a mod. Unless they take a shock from another wheel. Just my opinion.

Dirt Newbie

Total posts: 4
posted June 10, 2005 01:19 PM  
ya you can only run 5 shocks so how are you going to get away w/ it? I do agree it works well i saw a guy win a heat at west plains in the spring show, it was fast untill he went through tech.

Dirt Maniac

Total posts: 196
posted June 11, 2005 09:01 AM  
If you dont run a 90/10 you can run 2 shocks on the LR.I do it all the time.

Dirt Maniac

Total posts: 115
posted June 12, 2005 07:47 AM  
If you are running under IMCA rules I think it states something about only one shock per wheel in addition to the limit of 5 total. Anyone have the rules handy?

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