Advantages to shocks mounted in front of rear end?
#2024941
03/05/16 12:34 PM
03/05/16 12:34 PM
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Like the posts says. Any advantages?
78 Adventurer 150small block turbo'd 360w/Borg S475....smoke'em
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025117
03/05/16 05:19 PM
03/05/16 05:19 PM
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Just curious if people have expierance with this or not. I know alot of stock class leaf spring guys do this.
78 Adventurer 150small block turbo'd 360w/Borg S475....smoke'em
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025121
03/05/16 05:31 PM
03/05/16 05:31 PM
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Monte_Smith
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^^^^^^^^^^^^^^Likely because that's where they were from the factory. From a performance or control issue, it simply doesn't matter. The move to the rear on most race cars is simply a matter of convenience. Easier to mount, more room, easier to adjust.
The shocks simply control the rate at which the housing moves, nothing more, nothing less. So doing that from in front or behind doesn't matter
Last edited by Monte_Smith; 03/05/16 05:34 PM.
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025152
03/05/16 06:41 PM
03/05/16 06:41 PM
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polyspheric
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If the shock body is vertical in both positions, and the same distance from the axle center, they'll work the same. If they are at an angle (or a different angle), or distance, their leverage changes.
Boffin Emeritus
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025153
03/05/16 06:43 PM
03/05/16 06:43 PM
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Monte_Smith
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That's why shocks are adjustable and also why how "so and so" has HIS shocks set, usually doesn't matter on YOUR car
Last edited by Monte_Smith; 03/05/16 06:44 PM.
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025512
03/06/16 03:36 AM
03/06/16 03:36 AM
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Sport440
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Don't think it really makes a difference, that cant be tuned out with a adjustable shock. But there is a mechanical difference.
On a driven axel a shock will have more leverage mounted behind the axel being further out on the axels "lever" mounting point from the front spring eye, then it would be in front of the axel by 6",s or so. Really not needed though, with todays adjustable shocks.
Now on a leaf spring , there may be some advantage of mounting the shock in front. It may help provide more hit to the tire. Because on the hit the rear housing will try to separate down away from the car but also rotate up with pinion wrap.
A shock mounted behind the axel will only see a extension pull from that action.
A shock mounted in front of the axel will First see a rotational compression as the pinion rotates up as will the shocks mounting points before it sees the extension pull forces before the axel arks down and away, thus maybe helping plant the tires on the hit some. Acting like a pinion snubber so to speak.
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025528
03/06/16 04:39 AM
03/06/16 04:39 AM
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Monte_Smith
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Have posted before but will post it again. EVERYTHING, leafs, ladder bars, 4-link, truck arm, doesn't matter.......shocks in front, shocks in back...STRETCHES the shock at the hit. Also in the front or behind, the lower shock stud is a short distance from the center of the housing and will do NOTHING to control pinion rise. That is strictly a force control of the front spring segment on a leaf car. You could put a solid bar in place of the shock and it will still roll the front segment up. The housing, spring and shock plate is essentially solid where it mounts together at spring pad and the shock can do nothing to control rotation, no matter where it is mounted. The shock controls reaction of the housing up and down only, not twisting...........Got tons of shock sensor data to back up those facts.
Every car on the planet tries to "throw" the housing out at the hit, even a solid suspended car. Why you think fuel cars flatten the tire at the hit. It can't throw the housing, so it pulls the chassis down and crushes the tire.
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2025648
03/06/16 12:35 PM
03/06/16 12:35 PM
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70 Cuda, slightly narrowed frame, ladder bar setup, Dan. Out of room in front. Put my Koni's in back. When I upgrade to QA1's, it will be much easier to change shock adjustments on the fly from the rear of the car than from the front.
[image][/image]
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Re: Advantages to shocks mounted in front of rear end?
[Re: jcc]
#2026226
03/07/16 01:14 AM
03/07/16 01:14 AM
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If using a coil over type shock the springs will be different due to the ratio/percentage where it holds up the weight.. on the rear the spring is a bit softer than on the front.. the shock still has to control just like on the rear side but in most cases it has to do it in a shorter distance so the shock has to be good
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Re: Advantages to shocks mounted in front of rear end?
[Re: cudaman1969]
#2026285
03/07/16 02:38 AM
03/07/16 02:38 AM
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Listening to a renowned chassis builder and me not knowing much about shocks, I was advised to put the Konis in the front at about a 45* angle leaning forward at the top. Said it would soften the back of a light car. Most coilovers at the time might have had 3 adjustments, not like today. My car was VERY easy to push down in the back(soft) and would hook on snot. Four-link and wish bone, 2510 # with my 255# butt My car is 2405# with me.. my shocks at vertical in the rear.. with 90# springs.. yep its easy to push down with single adjustables.. its a 4 link with a wish bone.. I run a 1.19 60' with a 405ci
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Re: Advantages to shocks mounted in front of rear end?
[Re: dodge turbo]
#2026679
03/07/16 07:16 PM
03/07/16 07:16 PM
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deaks
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I put my shocks in front of the axle because it was easier to mount them vertically, i just swapped them side for side ran a tube across the top and modified the bottom mounts. My car is on SS springs with clamps best 60ft is 1.36. average 1.40-42 Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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