What is axle tramp/hop? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 4 (permalink) Old 05-10-03, 10:13 PM Thread Starter
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What is axle tramp/hop?

I know it sounds pretty basic but I've heard the expression but don't know exactly what it means.

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post #2 of 4 (permalink) Old 05-11-03, 12:47 AM
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These two aren't always exactly the same thing and there are a number of causes.

In simple terms axle tramp is what happens when a large dose of torque is delivered to the rear axle (such as a full bore launch) and the leaf spring (usually) deforms into an S shape and the spring rate increases exponentially until the wheel is actually bounced off the ground which in turn unloads the spring so the whoe cycle can be repeated until the torque is reduced sufficently and the spring stabilises.

Axle tramp can also occur any time one of the wheels becomes heavily unloaded or if there isn't sufficient suspension compliance to maintain road contact during heavy cornering.

It was always thought that axle tramp was the exclusive domain of leaf sprung rears but that hasn't proven to be the case.

That's not a very detailed explanation but it will do till I can write a tech article on the subject!

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post #3 of 4 (permalink) Old 05-11-03, 04:03 AM
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I found that axle tramp is not an easy thing to pin point as road surface has a great effect on whether a car axle tramps or not.

I found on my XR6 that on a certain bit of road where it's quite undulating, taking off full pelt induces axle tramp. But other times it's just alot of wheel spin but no axle tramp at all.

Oh yeah the feeling isn't good, feels like the diff, driveline gearbox is about to fall out of the car.

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post #4 of 4 (permalink) Old 05-11-03, 04:51 AM
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Mine seems to do it BAD in the wet from a stop if I give it some. Never happened in the dry though?

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