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03-14-2012, 09:18 PM | #61 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. Quote:
TT is all about resistance of movement. If there were no resistance, there would be no twist. That is not quite the same. It kinda is, but it isn't. | |
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03-15-2012, 12:17 AM | #62 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: What is Torque Twist (TT) and how to fix it.
The problem with your test is you are comparing a rwd car with unknown motor layout with a fwd car with a specified tea verse mounted motor. A typcal rwd buggy with a transverse mounted motor has no TT just like the fwd car with a transverse motor. Hold either of those two setups from the front or rear end & you'll experience no TT. Grab the middle of the chassis on one side and nail the throttle & you experience TT, because the initially stationary drivetrain & wheels are resisting the powe the motor is producing. Even if an AX axled rig had a transverse mounted motor, it would still experience TT because the power would be transferred& resisted longitudinally and not transversely. |
03-15-2012, 01:11 AM | #63 |
I wanna be Dave Join Date: May 2006 Location: akron
Posts: 4,054
| Re: What is Torque Twist (TT) and how to fix it. |
03-15-2012, 06:22 AM | #64 | |
Rock Crawler Join Date: Jun 2011 Location: San Diego
Posts: 698
| Re: What is Torque Twist (TT) and how to fix it. Quote:
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03-15-2012, 08:14 AM | #65 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. Quote:
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04-10-2012, 12:00 AM | #66 |
Pebble Pounder Join Date: Mar 2012 Location: Madisonville
Posts: 169
| Re: What is Torque Twist (TT) and how to fix it.
Maybe a visual will help |
04-10-2012, 12:18 AM | #67 |
Pebble Pounder Join Date: Mar 2012 Location: Madisonville
Posts: 169
| Re: What is Torque Twist (TT) and how to fix it.
If you disconnected the axles, and pulled the trigger your crawler wouldnt lift the right front. it might rock side to side, but no twisting involved. You don't have twisting in drive train and chassis till you have torque applied to the wheels which are resistant to turning.
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08-17-2012, 08:27 AM | #68 |
Quarry Creeper Join Date: Feb 2012 Location: Fort Worth
Posts: 237
| Re: What is Torque Twist (TT) and how to fix it. Newton's third law of motion states that "to every action there is an equal and opposite reaction." The above picture shows the axle twisting or rotating clockwise (from our perspective) which means that the drive shaft is actually turning in the opposite direction. (counterclockwise) Everything in the vehicle that rotates/spins has rotational inertia. That means the motor armature, spur gear, tranny gears, driveshafts, ring and pinion gears, axles, wheels and anything else that spins doesn't want to when you hit the throttle. That causes anything they are connected to, to attempt to twist in the opposite direction. So TT is caused by the sum of all of the above items. Some just cancel each other out.
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08-17-2012, 12:09 PM | #69 | |
Rock Crawler Join Date: Oct 2011 Location: Great Outdoors
Posts: 651
| Re: What is Torque Twist (TT) and how to fix it. Quote:
Last edited by Hardline; 08-17-2012 at 12:40 PM. | |
08-17-2012, 04:25 PM | #70 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: What is Torque Twist (TT) and how to fix it. |
08-17-2012, 05:33 PM | #71 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. |
08-17-2012, 05:52 PM | #72 |
No idea what I'm doing Join Date: Oct 2008 Location: Underground, CO
Posts: 4,529
| Re: What is Torque Twist (TT) and how to fix it.
I still think the best way to experience this first hand, is with the electric hand drill and the drill bit stuck in the wood. The drill bit is the driveshaft and your hand is the chassis. Pull the trigger and what happens?
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08-17-2012, 05:58 PM | #73 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. You are 90% there with your analogy. The bit is the driveshaft, the drill case is the chassis, you are the flexible suspension connecting it to the ground. |
08-17-2012, 06:22 PM | #74 |
Rock Crawler Join Date: Oct 2011 Location: Great Outdoors
Posts: 651
| Re: What is Torque Twist (TT) and how to fix it. ^^^ is the closest to my version. Resistance at the tires applies forces the same as if you tried to push a car backward. The motor and drivetrain won't let the pinion spin backward, and the result is the ring gear attempts to climb the resisting pinion. The ring gear climbs and twists the axle with it. Anyway...it works for me. ( I hope it's not wrong -- I'd hate to have to try to figure this out again. It's taken me months ) |
08-17-2012, 06:27 PM | #75 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. Quote:
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08-17-2012, 08:26 PM | #76 | |
Rock Crawler Join Date: Oct 2011 Location: Great Outdoors
Posts: 651
| Re: What is Torque Twist (TT) and how to fix it. Quote:
But it's too complex a concept for all of us to see it the same exact way. This way works for me. But I think that any solution that acknowledges the role of drivetrain twisting plus resistance to forward motion is on the right track. For a long time I thought the motor torque and motor case reaction to the chassis was the culprit. I've totally given that up. | |
08-17-2012, 09:16 PM | #77 |
Pebble Pounder Join Date: Aug 2009 Location: Fort Collins
Posts: 112
| Re: What is Torque Twist (TT) and how to fix it.
Indeed. The ring and pinion relationships only effect on the suspension is for antisquat. If you could have a transverse (sideways) mounted motor, and use a chain like drive system you would eliminate the actual torque "twist" effect, you would however have other effects. Like said before the actual twisting effect on the chassis/drivetrain is caused by the motor and drive shafts spinning the way that they do. So at the end of the day there is no actual cure for torque twist that does not eliminate the benefits gained from this system - antisquat. Look at IRS vehicles, they have far less torque twist but also cannot get the power to the ground. Look at chain drive ATVs they have no torque twist, but they can get extremely rigid suspension in a bind, and have no articulating suspension. Ok, yea there is a "real" cure - A transverse mounted motor on the axle (MOA), you still get antisquat but have no torque twist. If you mounted a motor right on the pinion of normal axle (like AX10) you would still have TT, such as a LCC with the MOA mod, though I think worm gears do eliminate TT. Last edited by Erock; 08-17-2012 at 09:25 PM. Reason: added MOA stuff |
08-18-2012, 04:01 PM | #78 |
Quarry Creeper Join Date: Sep 2008 Location: Isle of Man
Posts: 469
| Re: What is Torque Twist (TT) and how to fix it.
AX10 with front mounted MOA and flexy drive from front axle to rear would eliminate it as the chassis wouldn't experience any forces as such and is a project I've been thinking about for a few months now
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08-18-2012, 05:30 PM | #79 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: What is Torque Twist (TT) and how to fix it. |
08-18-2012, 06:42 PM | #80 |
No idea what I'm doing Join Date: Oct 2008 Location: Underground, CO
Posts: 4,529
| Re: What is Torque Twist (TT) and how to fix it. |
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