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Front Suspension Leg higher

 
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SuperRedMR2




Joined: 16 May 2005
Posts: 5453
Location: Wickford, Essex
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1990 Toyota MR2 Mk1b

PostPosted: Sun Aug 06, 2017 11:36 am    Post subject: Front Suspension Leg higher Reply with quote Reply with quote including images

I fitted my new BC Coilovers yesterday and we found that where the rear of the car was the same height more or less 1mm, the front was at 583 FR and 597 FL.

There is no evidence of crash damage and I haven't had an accident in it for the last 10 years of ownership.

Could this come out of the factory with different heights of the strut towers? Or anything else to say why the front is at different heights?
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SuperRedMR2




Joined: 16 May 2005
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1990 Toyota MR2 Mk1b

PostPosted: Sun Aug 06, 2017 11:53 am    Post subject: Reply with quote Reply with quote including images

We were using the floor to the wheel arch as a measurement. My front wings are FG but one does not sit 14mm higher than the other.

We managed to get the difference down to 6mm but this changed the rear heights in the process.
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Lauren
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PostPosted: Mon Aug 07, 2017 6:15 am    Post subject: Reply with quote Reply with quote including images

Installation error? Worth checking.

Or your chassis isn't straight. What else can it be?
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SuperRedMR2




Joined: 16 May 2005
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1990 Toyota MR2 Mk1b

PostPosted: Mon Aug 07, 2017 11:44 am    Post subject: Reply with quote Reply with quote including images

The installation was all fine and dandy, a real doddle.

It was noticed a few years ago that the front left was higher than the rest and that was with the Koni's fitted.

Must be a chassis issue.
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kaiowas




Joined: 07 Jun 2005
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Location: Norfolk
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1985 Toyota MR2 Mk1a

PostPosted: Mon Aug 07, 2017 2:39 pm    Post subject: Reply with quote Reply with quote including images

For a start, measure your ride height properly. You'd be surprised how far off bodywork can be without it being obviously noticable. Particularly aftermarket fibreglass parts. Measure to a point that's structurally fixed and relevant to the suspension. I'd suggest the inboard end of the track control arms. It's not as convenient as measuring the arches but it's a hell of a lot less meaningless.

Secondly make sure you're taking measurements on a proper flat and level surface. Ideally this should be a poured concrete surface which has been wet enough to be allowed to settle under gravity and then measured to be flat and level. A driveway or car park that 'looks right' isn't really good enough.

Finally, forget about the measured ride heights and have it corner weighted instead. Done properly it'll compensate for any variation in the chassis anyway. Corner weighting is the equivalent of adjusting one leg of a table so that it doesn't wobble. The absolute lengths of the table legs is less important than having the weight correctly distributed over them. If you've fitted suspension with adjustable ride height then it's really essential to get this done.
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SuperRedMR2




Joined: 16 May 2005
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Location: Wickford, Essex
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1990 Toyota MR2 Mk1b

PostPosted: Wed Aug 09, 2017 9:02 am    Post subject: Reply with quote Reply with quote including images

kaiowas wrote:
For a start, measure your ride height properly. You'd be surprised how far off bodywork can be without it being obviously noticable. Particularly aftermarket fibreglass parts. Measure to a point that's structurally fixed and relevant to the suspension. I'd suggest the inboard end of the track control arms. It's not as convenient as measuring the arches but it's a hell of a lot less meaningless.

Secondly make sure you're taking measurements on a proper flat and level surface. Ideally this should be a poured concrete surface which has been wet enough to be allowed to settle under gravity and then measured to be flat and level. A driveway or car park that 'looks right' isn't really good enough.

Finally, forget about the measured ride heights and have it corner weighted instead. Done properly it'll compensate for any variation in the chassis anyway. Corner weighting is the equivalent of adjusting one leg of a table so that it doesn't wobble. The absolute lengths of the table legs is less important than having the weight correctly distributed over them. If you've fitted suspension with adjustable ride height then it's really essential to get this done.


Yeah I agree regarding the flatness of the concrete we were measuring it against and that my wings are fibreglass and one sits higher than the other. We conceded that the datums we were using were not good enough.

I also reused a worn out front tie rod as I just couldn't get a hold of any for the MK1 last weekend. The MK2 fronts do not fit either.

I will have it corner weighted as soon as I find out the cost of my speeding ticket
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Gazza_DJ
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Joined: 29 Nov 2010
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1997 Toyota MR2 Mk2 NA Rev4

PostPosted: Wed Aug 09, 2017 9:36 am    Post subject: Reply with quote Reply with quote including images

BGB for the SW20 lists stock ride height, I would assume it's in the AW11 one as well. From memory the SW20 one measured from the the control arm at the chassis end. As Kaiowas says though, any fixed point on the chassis is fine to measure from. Bodywork is not!
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SuperRedMR2




Joined: 16 May 2005
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Location: Wickford, Essex
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1990 Toyota MR2 Mk1b

PostPosted: Wed Aug 09, 2017 10:52 am    Post subject: Reply with quote Reply with quote including images

I've contacted fast road/trackday suspension specialist for information about getting mine setup properly with corner weighting [Smile]
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