mx5cartalk.com

G'Day guys,

I have been doing some searching on forums and the Google with no joy so I am now asking the question.

I have a lightened NB which is destined for track autocross work and want to replace all the suspension bushings. Talking to my suspension guru he has suggested eccentric bushing for upper and lower control arms both front and rear to gain camber over -2degrees.

None of the bushing kits I have found online seem to come with eccentric bushes to maximize your camber adjustment such as the 949Racing Kit:

http://949racing.com/energy-suspension- ... miata.aspx

So my questions,

1.how does one maximize camber if you don't have eccentric bushes (over -2 degrees), and

2. are there any kits that include eccentric bushes if they are actually required?

Please be gentle if the answers are obvious - first post.

Thanks

Fulcrum do eccentric bushes. I don't like the idea of having to regrease them regularly, or that a decent knock can possibly throw your alignment out. I opted for extended lower balljoints instead, which bumped my maximum front camber from -1.5 to -4.3. Appears that the minimum camber know is around -2. Mine were through a group buy from Madjak, but there are a couple of different brands with extended balljoints available.

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Superpro do offset bushes, both for upper and lower.
I have about 3.5deg atm with offset bushes upper and lower.
I get it aligned every 6-12mths and they are still in the same spot, so haven't moved in 7 years of trackwork, though the car does do minimal road kms..

The extended lower ball joints are a better way to go on your NB though if you want a heap of camber.. (>2deg)

Excellent, thanks. The extended lower ball joints sounds like what I am after!

I appreciate your responses!

One more question, without being able to look at my suspension, can extended ball joints be fitted to the rear as well? i.e. one size fits both front and back?

tiw wrote:One more question, without being able to look at my suspension, can extended ball joints be fitted to the rear as well? i.e. one size fits both front and back?

No. The rear wheels don't need to swivel so dont use a ball joint..

However you can buy adjustable arms that have screw type adjustment built into them.
eg http://www.meganracing.com/tech/updates.asp?id=78&subject=MR-6674%20Mazda%20Miata%201990-1997%20Rear%20Upper%20Adjustable%20Arms
Dont know anyone using them though, so no idea on quality, etc..

Rear camber is a lot more free than front from factory. You should be able to get -2.5 or more on rear without any modifications, thats what I've got and it's only slightly lowered from oem, no other suspension changes in the rear.

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These should work?

http://www.aus-cartalk.com/forum/viewtopic.php?style=3&f=44&t=71552

( I have no association with seller )

rascal wrote:

tiw wrote:One more question, without being able to look at my suspension, can extended ball joints be fitted to the rear as well? i.e. one size fits both front and back?

No. The rear wheels don't need to swivel so dont use a ball joint..

This is not strictly correct, but the required movement is quite small as it is only associated with toe adjustment and readily accommodated in the upper outer rubber bushing.

rascal wrote:However you can buy adjustable arms that have screw type adjustment built into them.
eg http://www.meganracing.com/tech/updates.asp?id=78&subject=MR-6674%20Mazda%20Miata%201990-1997%20Rear%20Upper%20Adjustable%20Arms
Dont know anyone using them though, so no idea on quality, etc..

I suggest anyone using this style of replacement suspension arm research them carefully.

However, unless you are planning insanely low ride heights, offset bushings generally provide adequate camber adjustment. It is also possible to modify the outer end of the rear upper arm to accommodate a stock camber adjuster. With that and offset bushes you will have more than enough camber adjustment for road or track.