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Old 09-08-2015, 03:29 PM   #1
d k
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Default Suspension difference(s) between NA and NB

As a continuation of this thread: https://www.miataturbo.net/race-prep...0-85778/page2/
Id like to focus my attention on figuring out the exact suspension differences between the 2 platforms.

I have been keeping an eye out for an NB, but found a pretty good deal on a NA.

The front subframes ared different, that much I know. Since Im doing a swap anyway, an aftermarket subframe will take care of the differences there.

Are there any differences to the spindles and hubs?

What about rear suspension?

Thanks again.

David

Last edited by d k; 09-08-2015 at 03:51 PM.
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Old 09-08-2015, 04:14 PM   #2
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tophats, springs, perches.
do a search I'm pretty sure there's a really detailed thread about it.

\/ or just look below \/

Last edited by 18psi; 09-08-2015 at 04:27 PM.
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Old 09-08-2015, 04:19 PM   #3
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If I recall correctly:
  • NB subframes have the lower control arm mounting points dropped for geometry correction
  • The tie rod points on the spindle are raised for bumpsteer correction
  • The UCA balljoint taper angle on the spindle is different as well, but aside from the different balljoint, the upper arm is the same as the NA
  • The NB uses a unique steering rack mounting.
  • In the rear, the spindles are a little different which gives a 5mm wider rear track width on each side. The subframes, arms, etc. are all geometrically identical
  • The NB lower arms front and rear only have a single-shear mount for the sway bar links (NA arms have double shear mounts)
  • The rear subframes have different locations for the exhaust hangars
  • The tophats locate the shock shaft higher in the chassis (allowing for more bump travel at the cost of droop travel, all other things equal). Most aftermarket shocks are set up for NB tophats.

As far as I know, that's it.
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Old 09-08-2015, 04:32 PM   #4
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Thats awesome.

Im not overly concerned with the easy bolt on stuff like hats and springs as I planning on getting coilovers and most likely suspension arms for it.

The single vs. double shear is an interesting observation.
The S1 and S2 Elise had a similar situation although Im surprised the Miata went backwards.


What about ABS?
is it worthwhile to swap the later ABS unit?

D

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Old 09-08-2015, 04:33 PM   #5
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yes. NB2 abs setup
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Old 09-08-2015, 04:38 PM   #6
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If you plan to run in the rain, sure. Running production-grade ABS in the dry is a recipe for torched brakes and longer braking distances, though.
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Old 09-08-2015, 04:45 PM   #7
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Pretty much what everyone else said... since you'll be swapping front subframes anyway for your motor swap, half of the car can be "as you wish". At least up front.
Since this is going to be all "racecar" and everything, the NB2 abs swap will be very advantageous. And a heck of a lot cheaper than say... caging an NB2.

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Old 09-08-2015, 05:14 PM   #8
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I'm not so sure. If you're looking to do a swap, buying a high-miles NB2 with a straight body will be far less of a hassle than buying an NA for less money and then trying to transplant the NB2 ABS into it. Not to mention the NB2 running gear is worth more.
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Old 09-08-2015, 05:52 PM   #9
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There's nothing wrong with a single sheer solution as long as it's designed properly. The e-famous one is the Lotus toe link, but the issue wasn't that it was single sheer; it just straight up wasn't spec'd properly.
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Old 09-09-2015, 01:37 PM   #10
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The front upper control arms are dimensionaly the same, but the NB control arms have more gusseting on the lower side compared to the NAs. It actually changed at least three times between 90-05 from what I've seen. NA6 had the least (mostly around the bushing tubes), NA8 got a little more (extending away from the bushing tubes), and NB got even more (out towards the middle of the control arm).
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Old 09-09-2015, 02:58 PM   #11
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Thank you.


I will probably go with a complete set of lightweight aftermarket A arms, so not overly worried there.

From what Ive gathered so far, most of the changes were up front and aftermarket subframes are modeled after the NB geometry anyway.

Rear suspension seems to be mostly the same.

Aero is pretty close after a wing and a splitter.

Only big differences are the ABS (which Im researching now)

Fuel system is different too: NA is a return system where NB is a returnless (like the K series)

So the NB has many advantages:
Slightly better aero
Easier conversion
ABS

Also some disadvantages:
More expensive to start
Fuel system is harder to modify later
Heavier

NA advantages:
Inexpensive to start
Lighter weight

Disadvantages:
More complex conversion
Needs a fair bit more work
Not as good aero (some of which gets negeted by more power and aero development)


Thats what I got so far....

*edit* as per Andrews post, I will investigate the differences in hubs and spindles as well.



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Originally Posted by Midtenn View Post
The front upper control arms are dimensionaly the same, but the NB control arms have more gusseting on the lower side compared to the NAs. It actually changed at least three times between 90-05 from what I've seen. NA6 had the least (mostly around the bushing tubes), NA8 got a little more (extending away from the bushing tubes), and NB got even more (out towards the middle of the control arm).
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Old 09-09-2015, 06:12 PM   #12
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If you look you can find NB's for under 2K that need some work. A friend of mine just got a '01 from under me for $1500 with a "bad" motor.

All of the ABS hubs I've seen have been the same and have less stress risers than than NA. All the NB (ABS and non) I have seen look to be same just with and w/o the tone ring. We make it a point on our Chump Car to us ABS or NB hubs exclusively for the additional strength.
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