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-   Suspension, Brakes, Drivetrain (https://www.miataturbo.net/suspension-brakes-drivetrain-49/)
-   -   more caster? (https://www.miataturbo.net/suspension-brakes-drivetrain-49/more-caster-104266/)

lvw 11-29-2020 03:18 PM

more caster?
 
I had an alignment done in the spring, using supermiata dual duty alignment numbers. When the car came back,he gave me the numbers I wanted for toe and camber, but he said he could not get the numbers for caster. I am trying to find the sheet he gave me ,I am pretty sure caster was around 2.7 positive on both sides. I have taken the car to one track event, but the longer I have driven it, I don't like the way it drives. Too darty ,if that is a word, I have to concentrate the whole time I am driving it, to keep it centered. I believe this is because of the low caster number. And oh yeah the car is lowered to a 4.5 pinch weld height. Is this a common problem? Any fixes say you mighty minds?

DNMakinson 11-29-2020 04:51 PM

Extended lower Ball Joints allow one to hit the Camber numbers, and also have lots of Caster. I don't know if 4.5 PW is low enough to not need them, or not. May depend upon NA vs NB?

I'm at 5.5 / 5.75, with the ELBJ, Dual Duty and 4.8* Caster. NB1 with power steering.
DNM

lvw 11-29-2020 05:14 PM

Forgot to say I have extended lower ball joints ,my alignment guy has like 30 years experience , lowered cars included. I have not replaced alignment bolts, car is an NA

lvw 11-29-2020 05:23 PM

When I lowered the car on these teins I measured from the fenders, was at 12.5 front, 13 rear. Now pinch weld is about 4.5 front and rear. I guess this is why Emilio says use pinch weld. Still does not explain lack of caster.

DNMakinson 11-30-2020 05:40 PM

Look at the rear-most eccentric bolts on the front. If they are not turned fully outboard, then you have more caster available. This assumes that the front-most are not fully inboard.

Does that make sense? The front-most primarily control camber, the rear-most primarily control caster.

DNM

concealer404 11-30-2020 06:34 PM

Find the sheet. 2.7* of caster should be a cakewalk to meet on stock hardware. If it's identical at 2.7 on both sides, get a new alignment guy. If one side is 2.7 and the other is very much not, check your car.

lvw 12-11-2020 06:40 PM

Update; had the car aligned again, same shop, and asked him to get as much caster as he could first, THEN get me the -2.5 degrees camber. (another website suggested this). He came back with positive 6 degrees caster,(so he said ) AND my -2.5 degrees camber. Regardless the car now drives as it should have ,steering is a little heavier,, but it stays centered on the road and is easier to drive. I now like driving it, much gooder! Thanks for your input and suggestions!

technicalninja 12-11-2020 08:17 PM

That's just double headed weird.
Why did he have trouble the first time?
Did he charge you second time around?
Strange...

Blkbrd69 12-15-2020 08:49 PM

He was looking at the eccentrics upside-down....

You can have a couple degrees of mine if you want.


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