Double adjustable shock. Does increasing compression...

[Nicks67GTO]

I'm wondering if increasing compression on double adjustable shocks acts as an artificial increase in spring rate, allowing for a more street friendly spring for driving and essentially allowing the shock to act in place of a heavier spring on the track?

[SSLance]

The spring carries the load and the shock is just a timing device that controls how fast the spring moves in each direction. By adding compression you aren't really increasing the load capacity, you are just slowing down how long it takes for the spring to compress.

I used this strategy on my car when I wanted to see what more rear spring rate would act like and I can say it does work, to a degree... What you don't want to do though is have both a bunch of compression AND rebound dialed into your shocks at the same time, they will work against one another and do neither very well. This strategy is a crutch really, not a desired tuning strategy.

I will say this, I recently went from a 250# spring in the rear to a 600# spring and the difference in ride on the street really wasn't near as bad as I though tit might be. Only the real slow, really sharp bumps are different, like the 1" hop up into my garage. On the road it's not bad at all.

[Nicks67GTO]

The spring carries the load and the shock is just a timing device that controls how fast the spring moves in each direction. By adding compression you aren't really increasing the load capacity, you are just slowing down how long it takes for the spring to compress.

I used this strategy on my car when I wanted to see what more rear spring rate would act like and I can say it does work, to a degree... What you don't want to do though is have both a bunch of compression AND rebound dialed into your shocks at the same time, they will work against one another and do neither very well. This strategy is a crutch really, not a desired tuning strategy.

I will say this, I recently went from a 250# spring in the rear to a 600# spring and the difference in ride on the street really wasn't near as bad as I though tit might be. Only the real slow, really sharp bumps are different, like the 1" hop up into my garage. On the road it's not bad at all.

You have a 600 lb spring in the rear?!

[Rod]

I'm wondering if increasing compression on double adjustable shocks acts as an artificial increase in spring rate, allowing for a more street friendly spring for driving and essentially allowing the shock to act in place of a heavier spring on the track?

no the artificial increase is done with rebound

[SSLance]

You have a 600 lb spring in the rear?!


:twothumbs Pretty recent upgrade...after MWMC.

[Nicks67GTO]

no the artificial increase is done with rebound

Interesting. What does compression do then? I'm trying to better wrap my mind around this?

[Nicks67GTO]

:twothumbs Pretty recent upgrade...after MWMC.

Wow...what's the front rate?

[Rod]

here is a quick pic of how it works.....

https://static1.pt-content.com/images/pt/2016/07/1a_zpsnpaigbiy-1.jpg

and here is how to explain it.....

its simple "your primary job as a driver is weight management" thats it....all the glory removed from racing...(bummer right)..your in that seat to control weight transfer front to back with brake and throttle then side to side with brake, throttle and steering..... simple....driver controls the speed of that transfer and the suspension settings control the balance of that weight transfer.....thats what its all about

with me so far....good...here is the basic explanation as told to me by Randy Pobst, and has always worked for me, for years...ready....

your a lumber jack....(hold on read it all) and a small tree next to you is falling....with no resistance it will just slam into the ground(to light a spring and no compression or rebound) so now you step in and try to hold it up, you are now the shock, you resist the falling weight of the tree, you are now compression damping the weight of the tree pushes down on you(got it) but there are really two of you lumberjacks there...your buddy is helping, he on the other side holding the tree back with a rope tied to the top and he is the rebound now,

hows that for a simple break down

I have heard many-many super complicated explanations and others that cant even explain it, but it just comes down to this

hope that helps

[SSLance]

I'm with you 100% on your first paragraph Rodney...but you lost me on the second part. How does rebound (as you describe as lift) help pin the shock down?

I've always been taught that stiffening the rebound adjustment helps hold the shock compressed longer, not letting the spring push (extend) the shock out as fast. More rebound holds the transferred weight on the that tire for a longer time... More compression helps keep weight from transferring to that particular tire.

[Rod]

I'm with you 100% on your first paragraph Rodney...but you lost me on the second part. How does rebound (as you describe as lift) help pin the shock down?

I've always been taught that stiffening the rebound adjustment helps hold the shock compressed longer, not letting the spring push (extend) the shock out as fast. More rebound holds the transferred weight on the that tire for a longer time... More compression helps keep weight from transferring to that particular tire.

I dont build them...it was explained that way to me and it has always worked...actually I take that back....I do build them....and it still has always worked for me

[Nicks67GTO]

Interesting Rodney. Thanks.

I guess my presumption was that compression was the resistance to shock movement and rebound was how hard it pushed back after the initial movement was over. Almost like 2 sides of the same coin.

[Twentyover]

here is a quick pic of how it works.....



with me so far....good...here is the basic explanation as told to me by Randy Pobst, and has always worked for me, for years...ready....

your a lumber jack....(hold on read it all) and a small tree next to you is falling....with no resistance it will just slam into the ground(to light a spring and no compression or rebound) so now you step in and try to hold it up, you are now the shock, you resist the falling weight of the tree, you are now compression damping the weight of the tree pushes down on you(got it) but there are really two of you lumberjacks there...your buddy is helping, he on the other side holding the tree back with a rope tied to the top and he is the rebound now,

hows that for a simple break down

I have heard many-many super complicated explanations and others that cant even explain it, but it just comes down to this

hope that helps


Why am I singing -

"Oh I'm a lumberjack and I'm OK, I sleep all night and I work all day..."

Sounds like if your trying to keep a tree from falling, you'll soon be squished.

But I digress...

[krom]

Interesting Rodney. Thanks.

I guess my presumption was that compression was the resistance to shock movement and rebound was how hard it pushed back after the initial movement was over. Almost like 2 sides of the same coin.

compression dampening is the shocks resistance to getting shorter.
rebound dampening is the shocks resistance to getting longer.

[MonzaRacer]

If you need think of a spring as load holding piece and remember if the body is going up under acceleration the tire should be planting or bitingg surface. If it's going down the wheel is lifting off ground.
NOW a spring absorbs and releases energy. Once a spring starts going up and down it only stops when acted up on to dampen the occillation of the spring.
This is body weight, bushing resistance, and shocks.
The point of shock is to keep body in control as well as axle/tire. Keeping tires on ground.
Too soft compression let's tires lift too hard rides like ass, rebound too tight won't let suspension lift from compression fast enough, too loose lets body lift too fast then if they fully extend can lift car off track. Whst I have found, especially with Ridetech, they get thing so close you then set them in middle, and adjust up or down from their.