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Old 08-20-2020, 08:26 AM   #301 (permalink)
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Yea the ND has a Skyactiv-G, 2.0L in the US, 1.5L elsewhere. I drove a 2016 once, and it was a fantastic car! Much more rigid than earlier models, great ergonomics and build quality, and pretty quick (if you put aftermarket cams on and give it a tune, it produces over 210hp making it "properly quick"). It's definitely not comfortable for taller people though, which is why I sadly can't buy one.

The Skyactiv is missing external cooled EGR so it's "only" 39% peak efficiency but I reckon the BP is something like 32. If you swapped the 1.5 from a Mazda 2 onto the Miata and drove very slowly, it would do very well.

The aerodynamics are, of course, still terrible, so something would need to be done about that before your mpg can start to rival an Insight.

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Old 08-21-2020, 01:11 AM   #302 (permalink)
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Quote:
Originally Posted by Ecky View Post
I've been tossing around the idea of my next car project (not any time soon) being an NA Miata with a Honda engine - one built for economy.
One of my dad's friends swaps honda motors into miatas, I think his biggest swap has something like 600hp?

Having a fast eco convertible is a tasty idea. I wonder how a kswapped metro convertible would do vs. a kswapped miata. Of course with performance upgrades done to both.
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Old 08-22-2020, 11:49 PM   #303 (permalink)
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Quote:
Originally Posted by mpg_numbers_guy View Post
One of my dad's friends swaps honda motors into miatas, I think his biggest swap has something like 600hp?

Having a fast eco convertible is a tasty idea. I wonder how a kswapped metro convertible would do vs. a kswapped miata. Of course with performance upgrades done to both.
Best engines in the world, when considering durability, efficiency, and performance altogether.

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Old 08-25-2020, 09:57 AM   #304 (permalink)
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What kind of gearing options (if any) do you have with the stock transmission and rear end?

I'm not aware of any gearing options for the trans itself. Not to say there aren't any.


There are slightly different OEM final drives available, but nothing significant.



There is however an aftermarket final drive you can get for the 5L V8 swap that I would love to have (with the stock engine).
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Old 08-25-2020, 10:02 AM   #305 (permalink)
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Side skirts - Yea or Nay?

Inspired/motivated by the wording in GM's active side skirts patent application...


Quote:
Generally, the larger the area of the side-skirts, the lower is the aerodynamic drag of the vehicle body.






There's 3.5 inches of clearance for the air dam & skirts.

Haven't tested the skirts. I Googled it -- there's almost nothing that hasn't been tested in the Miata racing world for top speed and/or downforce applications. But I didn't come up with anything.

Perusing images of Bonneville salt flats Miatas, all have deep front air dams, but most don't have side skirts. (Though most are lowered much more.)

And yes, I realize it badly needs some fairing aft of the rear wheel! Probably even moreso because of the skirts.
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Old 08-25-2020, 10:33 AM   #306 (permalink)
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They look cool, so yes
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Old 08-25-2020, 10:10 PM   #307 (permalink)
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I feel like it can't hurt, your airdam is already really low, and you already put them on, so might as well keep them?

Why isn't there a tail spoiler yet? I feel like that's gotta be measurable on a Miata.
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Old 08-26-2020, 01:33 AM   #308 (permalink)
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That looks faaaast, in a much classier way than the usual Miata in my opinion.

Last edited by ssullivan; 08-26-2020 at 01:34 AM.. Reason: html stuff derping around
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Old 08-26-2020, 01:54 AM   #309 (permalink)
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Side skirts - Yea or Nay?
Yea.
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Old 08-26-2020, 07:25 AM   #310 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I'm not aware of any gearing options for the trans itself. Not to say there aren't any.


There are slightly different OEM final drives available, but nothing significant.



There is however an aftermarket final drive you can get for the 5L V8 swap that I would love to have (with the stock engine).

4.3 (1.6 stock),
4.1 (1.8 stock),
3.9 (NB Anniversary edition)
3.63 (some 6-speed NBs, paired with Fuji or Torsen LSDs).

5-speed has a longer final gear than the 6-speed

I installed a 3.9 in my NA, in place of the 4.1, it feels a tad more sluggish, the difference in cruising RPM's is small (200rpm if I remember correctly).

3.63 Fuji's can be obtained rather cheaply from the UK, compared to the US prices, as everyone wants 3.63 gears for turbo applications.


Last edited by AdrianD; 08-26-2020 at 07:31 AM..
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