Does the 2019 Mazda MX-5 Miata ND2 really make more power than before? Time to find out.
While we had one in our hands, we visited Rob Fuller at Z Car Garage in San Jose, California. Did you notice the BRE Datsun 240Z on the cover of the latest issue of Classic Motorsports? He maintains it. And the 1971 …
Any chance of Dyno sheet overlays of the '19 vs a '17 or '18?
How does this 168hp and 149lb-ft compare to ND1 dyno numbers?
We're working on that story right now.
Calculating actual driveline loss is a notoriously inaccurate science
My job here is.. totally precluded. 
I've recently had Toyota 2zz's on my mind since acquiring a couple of real basketcases. Those were rated 180crank and dyno'd ~160whp through FWD drivelines that have a lot less spinning weight than RWD drivelines. I'd say your underrated comment is a fair guess!
That's a 50-60 whp increase over a fairly healthy NB in stock form. Not gonna lie, I'm a bit envious. Nevermind the torque...
te72 said:That's a 50-60 whp increase over a fairly healthy NB in stock form. Not gonna lie, I'm a bit envious. Nevermind the torque...
FWIW, I'll be driving an NB in STR at Solo Nats. :)
The first pull was made using sixth gear. The other two were made in fifth.
Why did you make the dyno runs in both 5th and 6th gear?
Wouldn't the 6th-gear results be most accurate because of the 1:1 transmission ratio?
-- Pete
Technically as long as the dyno is directly measuring the engine speed (it always knows the drum speed) it is always going to calculate the gear ratio and you're still going to come up with basically the same power result. You can choose a gear either because you think it incurs the least 'loss' or because the gear isn't going to result in tire speeds on the roller where a tire failure would kill everyone close to the car. lol
Vigo said:Technically as long as the dyno is directly measuring the engine speed (it always knows the drum speed) it is always going to calculate the gear ratio and you're still going to come up with basically the same power result. You can choose a gear either because you think it incurs the least 'loss' or because the gear isn't going to result in tire speeds on the roller where a tire failure would kill everyone close to the car. lol
Generally speaking, the 1:1 gear will have the least drivetrain loss because it's usually just directly coupling in the input and output shafts in the transmission, with no gears involved in changing speeds. It's also usually the strongest gear, for the same reason.
In reply to codrus :
Hearty "it depends". If it is an inertial dyno, testing in top gear may make the pull take so long that the engine heat soaks and loses power. This is not as much a problem when you have a 100mph headwind.
I always tested my RX-7 in 3rd gear for this reason.
The critical speed of the driveshaft in my Caprice is about halfway through 4th, which is my 1:1 gear. As a result, I have to run in 3rd to keep the driveline speed down.
PeteD said:The first pull was made using sixth gear. The other two were made in fifth.
Why did you make the dyno runs in both 5th and 6th gear?
Wouldn't the 6th-gear results be most accurate because of the 1:1 transmission ratio?
-- Pete
Rob, the dyno operator, was concerned about running into a speed limiter.
Knurled. said:In reply to codrus :
Hearty "it depends". If it is an inertial dyno, testing in top gear may make the pull take so long that the engine heat soaks and loses power.
That just means you're not making enough power. :)
But yeah, it's worth doing a couple test runs to validate the testing methodology because it's going to vary by car.
David S. Wallens said:te72 said:That's a 50-60 whp increase over a fairly healthy NB in stock form. Not gonna lie, I'm a bit envious. Nevermind the torque...
FWIW, I'll be driving an NB in STR at Solo Nats. :)
I still say value for the money is tough to beat when looking at the NB. Mom finally got to drive the one I bought my fiance in place of an engagement ring, and now totally understands why I did that.
***Disclaimer: Unless your lady is as much of a car geek as you, the car in lieu of a ring may not be the best idea.Fortunately, mine is a gearhead at heart. ***
A slightly crude overlay for everyone:
Better they under estimate than over estimate like they have in the past.
Toebra said:Better they under estimate than over estimate like they have in the past.
What, so an '04 RX-8 doesn't really make 255hp?
What, so an '04 RX-8 doesn't really make 255hp?
Now that you mention it, it's slightly funny that when we finally get 1/4 mile numbers for the new ND they're going to be WAY better than the RX-8 ever did.
To add to the fun, found this on Miata.net, guy says it's a 2016 ND and they did the pulls in 4th gear. 143hp / 138lb/ft of torque.
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