u/DannyHng

Link to the tool: https://dannyhng.github.io/miatadyno/

Hey everyone! I’ve been building a little project called MiataDyno for a while now. It’s basically a virtual dyno tool for NC Miatas (for now) that estimates WHP from OBD pull logs so you can compare mods, tunes, before/after changes, etc.

A few NC owners helped test it recently and we ended up catching a pretty important bug related to heat-soak detection. Some OBD scanners log temperatures differently, so certain hot pulls were accidentally getting averaged in. That’s fixed now and results should be a lot more accurate.

I also rebuilt the CSV parser so now you can pretty much just drop your log file in and it handles everything automatically:

• mph or kph
• °C or °F
• different pressure units
• different file encodings from various scanners

No setup/config needed anymore.

Also cleaned up the mobile experience a lot because the old version honestly wasn’t great on phones.

Right now I’m still trying to validate the tool against more real dyno sheets, especially for NC1/NC2/NC3 cars (stock or modded 2.0L for now, 2.5L engine is coming soon). Modded cars are actually the most useful for testing.

If anyone is willing to help, just DM me:

• year/trim
• mods
• dyno sheet/shop (optional)

I’ll send beta access and all I need is a quick run CSV log + your dyno number for comparison (optional).

First 10 testers from this post get lifetime founder access free!

Tool:
https://dannyhng.github.io/miatadyno/

Link to the website: https://dannyhng.github.io/miatadyno/ (you will need my code to run analysis. I recommend to use laptop for better display as I squeezed a lot of information into the website so viewing this on the phone's browser will be pretty much crowded)

Hey NC Miata owners! I'm looking for testers who already have a dyno sheet to compare against. Upload an OBD scanner log, get a wheel HP estimate from your pull. No dyno visit needed. I validated my own stock NC2 PRHT at ~126 WHP,which lands in the typical 118-128 Dynojet range. But I want to test it against more real dyno sheets before opening it up publicly.
If you've dynoed your NC and still have the sheet, I'd love to compare. You'd:

- Do a WOT pull with any OBD scanner that exports CSV (BlueDriver, OBD Fusion, Torque Pro)

- Send me the result + your dyno sheet

- Tell me how close (or off) the tool was

10 minutes of your time. Free during beta. NC1, NC2, NC3, stock or modded (2.0L for now) - all useful.
Link to the website: https://dannyhng.github.io/miatadyno/

DM me if you've got a sheet!

Not trying to sell anything yet. Just trying to figure out if this is worth pushing further.
Link to the website: https://dannyhng.github.io/miatadyno/

Hey guys, I've been building a virtual dyno tool specifically for NC Miata owners and wanted some honest feedback before I push it further.

Most virtual dyno apps give inconsistent results because they don't account for the things that actually matter. Your atmospheric conditions change day to day. Your wheel and tire weight affects the calculation. Whether your top is up or down changes your drag coefficient. Whether you're running a 6AT versus a 6MT changes your drivetrain loss. Most tools just ignore all of that and give you a single number with no context.

This one tries to do it properly. It takes a CSV log from a OBD scanner, runs road load physics on your pull data, averages multiple runs to reduce noise, checks pull quality before showing you results, corrects for barometric pressure and ambient temperature using real weather data, and accounts for your actual build, like aftermarket exhaust weight, wheel and tire setup, transmission type, top type.

The goal is to replace the $150–300 dyno visit for everyday mod testing. Not for official numbers, but for answering the actual question: did this mod do anything, and how much?

On top of that I'm looking at adding an analysis layer that flags things like power drop-off across pulls, heat soak between runs, and inconsistent data that might mean your pull wasn't clean.

Would you actually use something like this? And honestly, would you pay for it, or would you just stick with a real dyno or the free tools that exist?