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Old 06-03-2010, 08:30 AM   #1
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Default What is droop?

Hey guys, a local racer told me to get longer shock ends to increase my droop. I was looking at the mechanics of my car, and having longer shock ends wont increase anything except for maybe stiffening my shocks a little more?

Anyways, what is droop and can somebody explain how low vs high droop plays out in reality.
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Old 06-03-2010, 08:39 AM   #2
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Droop is how far your shocks will reach fully extended. To measure droop you get a set of calipers and measure from the middle of the nut to the middle of the screw. More droop will be more stable in corners but less droop will make the car rotate more.Longer shock caps will make the shock extend more.
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Old 06-03-2010, 08:42 AM   #3
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Droop is how far the suspension arm hangs down when the shock is fully extended. More droop will add to total suspension travel and can be helpful for bumpy track conditions. The wheels will have more room to move up and down to follow the bumps on the track and stay in contact with the surface. More droop will also increase load transfer and may not be benficial for smoother tracks.

If your droop is limited by the shocks, then adding longer shaft ends will provide more droop and more overall travel. Sometimes, however, the chassis or suspension linkages are the limiting factor for droop. To test this, take the shock out and see if the arm is able to extend further down.


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Originally Posted by mike881 View Post
Hey guys, a local racer told me to get longer shock ends to increase my droop. I was looking at the mechanics of my car, and having longer shock ends wont increase anything except for maybe stiffening my shocks a little more?

Anyways, what is droop and can somebody explain how low vs high droop plays out in reality.
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Old 06-03-2010, 08:48 AM   #4
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http://www.teamxray.com/teamxray/sho...p?file_id=4461
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Old 06-03-2010, 08:53 AM   #5
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thanks for that!
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Old 06-03-2010, 09:04 AM   #6
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Put simple, droop is downward travel of the car.
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Old 06-03-2010, 09:04 AM   #7
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Print it and take it to the track on race days it helps.
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Old 06-03-2010, 09:07 AM   #8
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Originally Posted by Eagle7 View Post

The Hudy guide that was linked above is very helpful... Droop's main objective is to help weight transfer like sway bars.. it is another tuning method to help gain maximum traction over rough stuff when on and off power steering.

Less front droop
1. Reduces front chassis upward travel on acceleration.
2. Improves high speed steering ability.
3. Increases on-throttle understeer.
4. Better on high speed smooth tracks.

More front droop
1. Increases front chassis upward travel on acceleration.
2. Reduces high speed steering ability.
3. Reduces on-throttle understeer.
4. Better on tracks that are rough with ruts, bumps, holes and jumps.

Less rear droop
1. Reduces rear chassis upward travel under braking or off-throttle.
2. Improves stability under braking.
3. Better on high speed smooth tracks.

More rear droop
1. Increases rear chassis upward travel under braking or off-throttle.
2. Improves steering in slow corners.
3. Better on tracks that are rough with ruts, bumps, holes and jumps.

1. Need to reduce off-throttle steering - Reduce rear droop.
2. Need to improve off-throttle steering - Increase rear droop.
3. Need to reduce on-throttle steering - Increase front droop.
4. Need to improve on-throttle steering - Reduce front droop.

Last edited by scoopdaloop; 06-03-2010 at 09:44 AM.
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Old 06-04-2010, 04:48 AM   #9
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Quote:
Originally Posted by l3asher View Post
Put simple, droop is downward travel of the car.
make that upward

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Old 06-04-2010, 05:30 AM   #10
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Quote:
Originally Posted by scoopdaloop View Post
The Hudy guide that was linked above is very helpful... Droop's main objective is to help weight transfer like sway bars.. it is another tuning method to help gain maximum traction over rough stuff when on and off power steering.

Less front droop
1. Reduces front chassis upward travel on acceleration.
2. Improves high speed steering ability.
3. Increases on-throttle understeer.
4. Better on high speed smooth tracks.

More front droop
1. Increases front chassis upward travel on acceleration.
2. Reduces high speed steering ability.
3. Reduces on-throttle understeer.
4. Better on tracks that are rough with ruts, bumps, holes and jumps.

Less rear droop
1. Reduces rear chassis upward travel under braking or off-throttle.
2. Improves stability under braking.
3. Better on high speed smooth tracks.

More rear droop
1. Increases rear chassis upward travel under braking or off-throttle.
2. Improves steering in slow corners.
3. Better on tracks that are rough with ruts, bumps, holes and jumps.

1. Need to reduce off-throttle steering - Reduce rear droop.
2. Need to improve off-throttle steering - Increase rear droop.
3. Need to reduce on-throttle steering - Increase front droop.
4. Need to improve on-throttle steering - Reduce front droop.
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Old 06-04-2010, 08:02 AM   #11
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Quote:
Originally Posted by Lonestar View Post
make that upward

Paul
+1 droop is very simple to measure. its how much the chassis travels upward from ride height before the wheels lift off the ground. i find alot of people confuse chassis droop with arm downstops.
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Old 06-04-2010, 09:01 AM   #12
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Quote:
Originally Posted by mike881 View Post
Hey guys, a local racer told me to get longer shock ends to increase my droop. I was looking at the mechanics of my car, and having longer shock ends wont increase anything except for maybe stiffening my shocks a little more?

Anyways, what is droop and can somebody explain how low vs high droop plays out in reality.
One more thing to take into consideration. Adding a longer shock bottom will increase droop, but it will also DECREASE the maximum uptravel on your arms. Make sure you can bottom out your chassis and still have a little room for the arm to travel upward. The wheels should lift off the ground with the chassis flat bottomed.
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Old 06-04-2010, 11:49 AM   #13
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I unscrew my shock ends a turn or two if I need more droop. That way my uptravel deosn't get killed. My Xray 809 needed a turn taken out to get it's droop to -3/-5mm.

Don't fear playing with droop during practice. Many are afraid to try different settings because it's hard to set droop evenly at the track. But it really deosn't matter if you off a little, you can be uneven by alot before the car starts jumping weird.

Most pros set it by shock length. I've found that measureing shock length as a measurement of droop is way less accurate than measuring actual wheel hub ht relative to the bottom of the chassis. So thier droop settings are actually all over the place, most likely very uneven side to side.

I've found measuring shock length for droop to be 3-4 times less accurate and repeatable than measuring droop at the hubs Hudy style. I can acurately get +/- 1 to 2mm with the Hudy tools, but shock length is only +/-3 to 4mm compared to the Hudy method.
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Old 06-04-2010, 12:03 PM   #14
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Yeah but when was the last time you saw anyone using a full 1/8 setup board and station at the track?

I have a camber gauge, ride height gauge and a digital caliber that's all I need.
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Old 06-08-2010, 02:06 PM   #15
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Don't need to. We leave those at home. The Hudy setup station deosn't do droop anyway. You need the 30mm blocks, a flat pit board or ceramic cutting board, and droop gauges to measure droop. And I see those at tracks all the time.

I still have the plain old setup tools. but when my car comes out of the main dialed. I want to know why, and how to replicate that.

Recording track temp, condition, and setup exactly helps one learn that. I've seen Hudy droop gauges, board stickers and other bits evidence lurking in pit boxes that racers have them at home. But you'll never get them to admit it. LOLz, it's like some kind of tuning secret.

Digital calipers are nearly useless on an offroad car for alighnments. Nerly every part on our cars is molded, and usually bent or warped from hard use. Not to mention its hard to get a reference point sometimes. I use them for clutch spring thickness, but thats about it.

It really boils down to how exact you want your setups recorded, if you care at all.
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