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Ride height on early cars

Here’s where to discuss anything specific about your standard(ish) car or something that applies to the model in general.
nick
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Postby nick » 02 Oct 2014 15:27

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Hasbeen</i>

Nick did you ever seriously look at what is different?

I had 2 1980 plated FHC Oz delivered cars, which had the same difference at the rear. It was a going to, [gunna do in Ozzie], measure them up accurately, but someone bought the lower car before I got round to it.

There is obviously some difference in the chassis, or control arms, but it was not obvious at a slightly more than casual look at the two.

Hasbeen
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

I did make an attempt by measuring at various places but never concluded anything. When changing the springs between the cars I used the top of the fender arch to the center of the hub cap to eliminate the tire variable. The one variable I did not account for is the shock height because I assumed they would ultimately compress to the same length. But this may be a false assumption. I wish I would have swapped shocks as well but that was bit more work than I wanted to invest.

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nick
'79 TR7 DHC
'76 TR7 FHC

Paul_TR8
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Postby Paul_TR8 » 03 Oct 2014 10:11

When measuring ride heights you should not measure the distance from the floor to the wheel arch as that measurement takes the vehicle mass into consideration with respect to tyre deformation. The way that it is measured at the OEM is from the centre of the wheel.

To find the exact centre is quite difficult so we measure from the bottom of the rim. We then measure the rim and take away half that value thus giving us centre of wheel to wheel arch.

The OEM will also give you figures for ride height at a certain mass for instance Kerb weight. So you need to have the car full fuel/water/tools/etc.

Ride height is adjusted using the spring length so measuring the springs free length (off the car) and compare it to the specification.

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