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Best place for rear lowering spring plates?
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sidemarkers
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PostPosted: Tue Nov 14, 2017 9:28 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

Bruce wrote:
sidemarkers wrote:
... is almost unbelievable.

That's because there's no difference.
Any improvement is all in your mind. Or you did other changes at the same time.
The spring plate is only a connecting link between the torsion bar and the TA. The shape of this rigid connection is irrelevant.


Very close to my thoughts when the drop plates first were marketed. I now think that the "shape" of the rigid assembly is fundamentally less important than the relationship it has on where the spring plates rest under load.

Pic 1 shows preloaded plates resting on stops while vehicle is on jackstands:

Image may have been reduced in size. Click image to view fullscreen.


Pic 2 shows suspension assembled and plates riding just above the stops while vehicle is on all 4 wheels supporting it's own weight:

Image may have been reduced in size. Click image to view fullscreen.


This is the relationship that gets lost when indexing, and subsequently gets restored when using drop plates.
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Bruce
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PostPosted: Sat Nov 18, 2017 5:59 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

sidemarkers wrote:
Bruce wrote:
sidemarkers wrote:
... is almost unbelievable.

That's because there's no difference.
Any improvement is all in your mind. Or you did other changes at the same time.
The spring plate is only a connecting link between the torsion bar and the TA. The shape of this rigid connection is irrelevant.

... where the spring plates rest under load.

You have been deluded by Charles' ignorance.
When you're driving down the road, is the bottom edge of the spring plate touching the ledge of the shock tower? NO! In both yours and a stock spring plate'd car, neither are touching the bottom limit.
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sidemarkers
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PostPosted: Sat Nov 18, 2017 6:37 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

The 2nd part of your assertion is correct. Both a stock spring plate with factory index and my 3 inch drop plate with factory index have +/- quarter of an inch gap from the ledge of the shock tower.

Indexing changes this distance, correct?
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Bruce
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PostPosted: Sat Nov 18, 2017 7:10 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

sidemarkers wrote:

Indexing changes this distance, correct?

The amount of air space is irrelevant. It has no effect on the ride.
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sidemarkers
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PostPosted: Sat Nov 18, 2017 7:25 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

Bruce wrote:
sidemarkers wrote:

Indexing changes this distance, correct?

The amount of air space is irrelevant. It has no effect on the ride.


...or the tire wear from toe problems. I'm not claiming that drop plates are necessary, indexing "worked" on my cars for the past 25 years.
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Bruce
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PostPosted: Sun Nov 19, 2017 2:09 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

sidemarkers wrote:

Pic 1 shows preloaded plates resting on stops while vehicle is on jackstands:

Image may have been reduced in size. Click image to view fullscreen.

If this is your car, can you take another photo like this, with the wheel off, but with the jackstand under the rotor? Simulating the car on all 4 tires.
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sidemarkers
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PostPosted: Sun Nov 19, 2017 10:27 pm    Post subject: Re: Best place for rear lowering spring plates? Reply with quote

Bruce,

Like the pic I posted earlier of the suspension actually loaded on 4 wheels?
Image may have been reduced in size. Click image to view fullscreen.


How would a photo simulating the loading of the suspension add to this discussion?
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