MX-5 Miata Forum - NC Power mods https://forum.miata.net/vb/ *** Sponsored by Good-Win Racing ***If you need more power than the car was built with, this is the place. Aftermarket parts and tuning from simple bolt on parts to total high performance engine builds. en Sun, 20 Sep 2026 09:00:07 GMT vBulletin 60 https://forum.miata.net/vb/images/SultanThemeVB3R/misc/rss.jpg MX-5 Miata Forum - NC Power mods https://forum.miata.net/vb/ Verus engineering oil seperator https://forum.miata.net/vb/showthread.php?t=803526&goto=newpost Sat, 19 Sep 2026 11:20:32 GMT I know they are made for the ND MX5 but I was wondering if one can be installed in a NC MX5 and if so has anyone attempted it. I know they are made for the ND MX5 but I was wondering if one can be installed in a NC MX5 and if so has anyone attempted it. ]]> NC Power mods kitch2199 https://forum.miata.net/vb/showthread.php?t=803526 Help with o2 sensor plug locations https://forum.miata.net/vb/showthread.php?t=803371&goto=newpost Tue, 08 Sep 2026 19:33:45 GMT Hi Im new to this forum and im hoping to get info on how to find the car loom connections for my O2 sensors to plug into ..I understand the down stream one is probanbly under the car near transmission tunnel . Im yet to jack up and check but i can seem to find the Bank 1 which im told is near the... Hi Im new to this forum and im hoping to get info on how to find the car loom connections for my O2 sensors to plug into ..I understand the down stream one is probanbly under the car near transmission tunnel . Im yet to jack up and check but i can seem to find the Bank 1 which im told is near the back of the head... Not had much luck on google.. Any help would be much appreciated .Thanks Scott ]]> NC Power mods Scottigone https://forum.miata.net/vb/showthread.php?t=803371 Help me understand the capabilities of the stock 2.5L engine. https://forum.miata.net/vb/showthread.php?t=803238&goto=newpost Tue, 01 Sep 2026 18:39:47 GMT Hello, I’m working on a Mazda MX-5 NC project. I’ve already installed a 2.5L engine from a Ford Fusion, and now I want to add a TD04HL turbocharger from a Subaru WRX. I’m aiming for 0.5 bar of boost to start with; the engine is completely stock, as is everything else—including the automatic... Hello, I’m working on a Mazda MX-5 NC project. I’ve already installed a 2.5L engine from a Ford Fusion, and now I want to add a TD04HL turbocharger from a Subaru WRX. I’m aiming for 0.5 bar of boost to start with; the engine is completely stock, as is everything else—including the automatic transmission. I’d like to know what the critical boost limit is for this stock engine and whether the pistons, connecting rods, and crankshaft bearings will hold up, as my goal is to build a reliable daily driver. I also plan to install an intercooler and coolers for both the engine oil and the automatic transmission fluid. Thanks in advance for your reply! ]]> NC Power mods AlexMX5NC https://forum.miata.net/vb/showthread.php?t=803238 Just need an explanation. https://forum.miata.net/vb/showthread.php?t=803102&goto=newpost Tue, 25 Aug 2026 12:08:33 GMT I just need an explanation of what's possibly going on:

Just added a 1.8" header, helmholtz midpipe, Super-Q muffler. Installed a Fab9/Versatune on the car. Other than that, the engine is stock. The car runs like a scalded ape. I removed the baffles out of the Super-Q and within a few miles, the car starts bogging down at low RPM's, want to stall at red lights and has thick soot around the tailpipes. I drove it far enough for the ECU to adjust to the new conditions, but it never did. It never threw any codes, just ran like sh*t!

Reinstall the baffles and bam...the car runs like a champ, again. Hard to believe that little amount of back pressure can make that big a difference.

Did it go super lean or super rich? The soot on the tailpipe would lead me to believe it went rich. I just want to understand. ]]> NC Power mods Soldaten https://forum.miata.net/vb/showthread.php?t=803102 Shrill/screeching noise during boost with FM turbo https://forum.miata.net/vb/showthread.php?t=803077&goto=newpost Mon, 24 Aug 2026 07:32:09 GMT Lately I've noticed that my FM turbo has developed an unpleasant "shrill"/screeching noise only during boost, as if air were escaping closer to the driver's side (like a balloon letting out air). It is not a typical sound associated with the usual turbo spool-up sound. I have not noticed any drop in boost pressure (8 psi for the NC1) or any idling issues. In fact, the car seems to be driving completely fine despite this strange noise. Here is what I've done so far:

1. I did a boost leak test to be sure, and a howling sound was heard at the EVAP purge valve. I thought the shrill noise would have went away after replacing this purge valve, however this didn't cure the issue.

2. Smoke tested the car, no leaks found.

3. Retightened all the clamps.

4. Checked for turbo shaft play, none noted. Fins appear to be fine.

5. Cleaned and re-lubed the diverter valve in case it was stuck open. No luck.

This noise only started after I recently completed an oil change and replaced the turbo oil return 90° AN fitting that screws into the oil drain plug (replaced this AN fitting because it was leaking). I wonder if it had anything to do with this, though I'm not sure how it would be related to the problem I'm having. Does anyone have any idea what this noise could be caused by? :ohno: ]]> NC Power mods Luke Asprec https://forum.miata.net/vb/showthread.php?t=803077 Rosso Modello Corsa Ti-C Exhaust from Rev9 https://forum.miata.net/vb/showthread.php?t=803049&goto=newpost Sat, 22 Aug 2026 17:29:57 GMT I have seen very little on this muffler and thought I would share. I recently acquired it used for a good price and thought I would try it out. First, you should know my car has a 2.5 with 11.5:1 compression, GoodWin Racing RoadsterSport Headers without a CAT and RoadsterSport Mid-pip with a... I have seen very little on this muffler and thought I would share. I recently acquired it used for a good price and thought I would try it out.

First, you should know my car has a 2.5 with 11.5:1 compression, GoodWin Racing RoadsterSport Headers without a CAT and RoadsterSport Mid-pip with a CAT. (NOT the Helmholtz pipe).

I previously had on the Street Single, too loud and drones alot without the baffle for me. I ran it with the baffle 99% of the time and it was quiet enough and the drone was controlled sufficiently for me.

Now the Rosso Modello. It appears to be very well made. Fitment is excellent. (Photos to follow.

Appearance: I am not personally a fan of the oversized exhaust tip style or the colored exhaust tip styles. That a personal preference and is a subjective style choice.

Sound: Not quite as loud as the street single with the baffle in it. Very street-able even with my set-up. I like the sound of it and their is little to no drone. That's a win.

Here is a link to a sound clip: https://www.youtube.com/watch?v=dFQyTMf3wCM
Attached Images
File Type: jpg IMG_2605.heic.jpg (108.7 KB)
]]> NC Power mods alphagamma https://forum.miata.net/vb/showthread.php?t=803049 Flyin Miata NC turbo kits are back in stock! https://forum.miata.net/vb/showthread.php?t=802959&goto=newpost Mon, 17 Aug 2026 15:38:12 GMT To anyone whose been waiting for these to come back in stock, looks like they're back! I haven't seen any announcements about this (and I already have this kit), but I know they've been out of stock for a while.

https://flyinmiata.com/products/flyi...system-2006-15 ]]> NC Power mods Cornoelius https://forum.miata.net/vb/showthread.php?t=802959 Anyone swapped a WRX STI engine/drivetrain into a NC? https://forum.miata.net/vb/showthread.php?t=802953&goto=newpost Mon, 17 Aug 2026 01:52:02 GMT Looking to see if making a NC into a 400HP AWD monster is possible Started out considering a K20/K24 swap but the Kpower kit was 10K plus engine Then moved to 2.5l Duratec/MZR swap, but to get 400hp need to upgrade to turbo/manifold, forged internals/transmission and possibly diff So while... Looking to see if making a NC into a 400HP AWD monster is possible

Started out considering a K20/K24 swap but the Kpower kit was 10K plus engine
Then moved to 2.5l Duratec/MZR swap, but to get 400hp need to upgrade to turbo/manifold, forged internals/transmission and possibly diff

So while I was running all these scenarios through grok/kimi I asked about awd plus 400hp ... first I asked about a Ford awd from a escape ... AI struck it down as impossible... so next option I tried was tesla SDU for front wheels but 300hp max won't match up with 400hp rear wheel drive ... plus the logistics of fitting the sdu would require moving steering and adding 600lbs of weight with battery

Sooo I asked about the WRX STI and while I will have to engineer a custom subframe, it solves a few issues
2004-2014 STI already have forged internals, 6spd transmission and diff capable of handling 400hp and 400 ftlb of torque... just need bigger turbo to boost from 305hp to 400hp

So the subframe ... I asked AI about 3D scanning to plan the subframe and suspension as I also want to put fender flares and deep dish 17x9

Anyone familiar with 3D scanning or subframe customizing?

Or know anyone that has attempted this crazy build? ]]> NC Power mods Buccaneer007 https://forum.miata.net/vb/showthread.php?t=802953 NC 8HP45 Conversion System - Fab9 https://forum.miata.net/vb/showthread.php?t=802931&goto=newpost Sat, 15 Aug 2026 21:10:18 GMT We completed our TXK transmission conversion system last year on our development 2014 Club. Some of you who were following along reached out with interest and the end result wasn't what we needed to see out of the project.

IT WAS AWESOME - For a Group - B rally car. NOT a street car of any sort. - Limitations with bell housings, limited undesirable clutch solutions and NVH being unacceptable. It was indeed completed and sold below cost to a customer of ours. That was when we moved on to 8HP research and development.

Meet the new guy, our 8HP test mule - this is currently installed on our shop NC2, Scalpel 2.4L equipped, Fab9 EFR Bottom Mount turbocharged car producing 440whp. We had this car on display at MATG last week and the reactions were awesome. "What the heck is that BMW shifter for?".

These transmissions are incredibly robust and hold the characteristics of a performance oriented sequential transmission, minus all of the straight cut dog box gear noise that comes along with them. Imagine all of that cool gear slapping business and THEN you can flip it into "Comfort mode". Drive it like a BMW 3 Series.

There are a handful of end users out there who've completed the task and it's killer to see their use cases paying off nicely. We're tryin to offer that in a VERY PNP minimal modification kind of way. There are some critical flaws we've seen that vary between setups, primarily related to the transmission oil pan being the lowest point on the car after the installation is complete. The alignment also results in tweaked driveshaft flanges, firewall clearance and of course your new plastic oil pan being the first point of impact.

What's included in it's current configuration?
- PNP Driveshaft that DOES NOT require output shaft modification
- PPF 1/4" Stainless Adapter Plate
- 13 row heat exchanger
- PNP BMW Shifter Assembly - Terminated with a 4 pin deutsch connector
- OEM available Flex Plate and Starter that DOES NOT REQUIRE ENGINE MODIFICATION
- CANTCU Controller W/PNP harness

Hardware wise? Everything bolts up and kicks butt. It looks like it's meant to be there. From a software point, our only development is with our Haltech Nexus S2 PNP system. We've been working closely with Haltech and in partnership with CanTCU, some new firmware was just released to streamline the integration. It's fantastic.

Our next move and from our discussion with CanTCU, the factory ECU shouldn't have any major limitations outside of a nifty "autoblip" function that's not a requirement for functionality.















]]> NC Power mods Fab9 https://forum.miata.net/vb/showthread.php?t=802931 NC - SWAP AUTO to MANUAL Transmission https://forum.miata.net/vb/showthread.php?t=802900&goto=newpost Fri, 14 Aug 2026 02:29:06 GMT Hello community,

I have a complete 2006 NC donor car with a 2.5 engine paired with a manual transmission. I would like to swap everything into a 2008 model that currently has DSC and an automatic transmission.

As I mentioned, my goal is to end up using the manual transmission in the "new" car while retaining DSC functionality. Which ECU should I use: the one from the manual-transmission donor car or the one from the automatic-transmission car?

MANUAL ECU has ECUTEK FLASH
AUTO ECU is OEM

Any additional advice is highly appreciated! ]]> NC Power mods jeanppg1485 https://forum.miata.net/vb/showthread.php?t=802900 Kpower K24 swap camshaft signal issue https://forum.miata.net/vb/showthread.php?t=802796&goto=newpost Sun, 09 Aug 2026 02:22:42 GMT Posting this in the modification section since this is regarding a K24-swapped NC Miata. Has anyone with a K24 or K20-swapped Miata run into an intermittent intake camshaft position sensor issue? I’m running a K24A2 with a Haltech Elite 1500. This was a turnkey KPower Industries swap. The... Posting this in the modification section since this is regarding a K24-swapped NC Miata.

Has anyone with a K24 or K20-swapped Miata run into an intermittent intake camshaft position sensor issue?

I’m running a K24A2 with a Haltech Elite 1500. This was a turnkey KPower Industries swap.

The intake camshaft position sensor will randomly lose its signal/connection. The problem is intermittent but happens fairly frequently, which makes tracking the car out of the question.

Has anyone with a K-swapped Miata experienced something similar? If so, what ended up being the cause? Sensor, connector/pins, wiring harness, power/ground, Haltech configuration, or something else? ]]> NC Power mods nckmiata https://forum.miata.net/vb/showthread.php?t=802796 NC Flash - An open-source ROM editor and flash tool https://forum.miata.net/vb/showthread.php?t=802588&goto=newpost Wed, 29 Jul 2026 00:52:17 GMT Aye! I don't know how I forgot to announce it here but a few months ago I started working on a new application to replace ECU Flash and merge with it RomDrop natively, enters NC Flash.

Disclaimer: This is a vibe coded application, I was a software engineer for 20+ years but I didn't look at a single line of code and that was the goal. That being said I think it performs really well, it's open source and free. The downside is that it doesn't come with any guarantee, use at your own risk.

Now that I've scared you, I've probably flash my bench ECU well over a 100 times with it and my own car ECU a dozen times with no issue and there's probably a few dozens users who used it successfully so far.

It's all hype from here ;)

Features:
  • Easy to learn since it's based on the concepts of ECU Flash and contains all the same features.
  • All the same table editing features of ECU Flash + Smoothing, rounding, exportable to excel, a built in screenshot engine, etc.
  • Complete RomDrop integration: Read ROM, Full flash, Dynamic Flash, Read/Clear DTCs, etc.
  • Powerful ROM comparison tools to quickly identify difference between ROMs. Copy of a table or even a whole ROM to another.
  • Project management included with version control of your ROM changes (no more excel file to track your changes).
  • Table browser is filterable with highlight, it's simple feature but it beat manually searching through the tree.
  • Cell selection highlighting on graph allows you to easily see where you are on the map.
  • Support ECU and TCM/TCU (In case you want to tune your automatic transmission).
  • AI Integration through MCP, eg: You can ask Claude or ChatGPT to take a look at your tune or even modify it.
  • Did I mentioned it's free and open-source (repo here)? You can clone it and change it however you want.

There's a lot more but that should give you an idea of what it can do.







Bonus point I'm also working on a Tactrix OpenPort 2.0 replacement. It based on a WiCAN Pro (80 USD), works over Wifi and is already fully integrated with NC Flash.



If you want to give NC Flash a try you can download the version 2.12 here.

Note: No documentation so far... I'm tired boss ;)
(I'll get there, I just to finish the integration of the WiCAN Pro properly before).

Enjoy,
Chuck

Note: If you find an issue, create a GitHub issue in the repo and I'll try to fix it. ]]> NC Power mods NyxOne https://forum.miata.net/vb/showthread.php?t=802588 Why Is My NC PRHT So Quiet Even With GWR Race Exhaust https://forum.miata.net/vb/showthread.php?t=802578&goto=newpost Tue, 28 Jul 2026 18:52:47 GMT I just installed the GWR Race Exhaust on my 2011 NC PRHT GT MT, and I’ve got to be honest… I’m a little baffled. I was expecting some attitude, some bark, maybe even a hint of that *GWR snarl*:cool: — but right now it sounds muted. Even with the PRHT top down, it still feels like the exhaust is... I just installed the GWR Race Exhaust on my 2011 NC PRHT GT MT, and I’ve got to be honest… I’m a little baffled. I was expecting some attitude, some bark, maybe even a hint of that GWR snarl:cool: — but right now it sounds muted. Even with the PRHT top down, it still feels like the exhaust is happening behind a wall. Almost like I’m listening to it from underwater. not what I was hoping for, WAY quieter then I would have ever imagined!

What’s throwing me off is that when I added the same GWR Race muffler to my ND3 RF, it was an instant transformation. Night and day. The ND woke up immediately — sharper, louder, more alive — even with just the axle‑back. So naturally I figured the NC would react the same way… but nope. Totally different personality.::mad::eek::(:cry:

Now I’m beginning to suspect the NC PRHT is just a quieter platform overall. There’s more structure behind your head, more insulation, and the stock header + midpipe choke the tone before it even reaches the Race muffler. The ND has a freer‑flowing upstream system and a cabin that resonates more, so it gets loud with way less effort.

Which brings me to the big question:

If I go full GWR header‑back on the NC — long‑tube headers, midpipe, Race muffler — will it finally wake up and get close to the loudness of my ND3 RF with all the bolt‑ons?

Because right now, with just the Race muffler, the NC sounds like it’s clearing its throat while the ND is out there singing opera:rofl:. I’m hoping once I free up the whole system, the NC will finally show some teeth.

Curious what others have experienced — does the NC only come alive once you replace everything upstream? ]]> NC Power mods LRSD https://forum.miata.net/vb/showthread.php?t=802578 Power chip the 2011? https://forum.miata.net/vb/showthread.php?t=802556&goto=newpost Mon, 27 Jul 2026 22:56:09 GMT Been 4 years since posting....all is still great with my 2011 PRHT GT. Is a power chip available to I stall in these cars, and if so, where is it installed/plugged in? Thanks Been 4 years since posting....all is still great with my 2011 PRHT GT.
Is a power chip available to I stall in these cars, and if so, where is it installed/plugged in?
Thanks ]]> NC Power mods Rgpracer https://forum.miata.net/vb/showthread.php?t=802556 Haltech PNP Stand-alone ECU System - Including the IC7 Dash Integration for the NC! https://forum.miata.net/vb/showthread.php?t=802487&goto=newpost Thu, 23 Jul 2026 22:53:02 GMT

Our Fab9 Tuning NC Miata Haltech Nexus PNP + IC7 Digital Dash Solution - We're now years into operation with these kits but the latest changes have truly made it a big audience compatible solution. They are also now exclusively on the Nexus S2 ECU over the 1500 Elite. So this offers an internal Wide-band controller and vastly improved functions everywhere.

These are now STOCKED here in Tennessee. Order today.

One of the things we've always wanted for the NC platform was an ECU and digital dash solution that looked like it belonged in the car. Not something that required cutting up the interior or hanging a screen off the steering column (our shop car was AIM equipped like this for years).

We're excited to finally offer exactly that. - Haltech Nexus S2 Plug & Play ECU and now without compromise.

The Plug & Play Haltech Nexus S2 system has quickly become our favorite ECU package for the NC Miata. The OE ECU is fantastic for most applications but it's certainly hardware limited and not an expandable ecosystem. As soon as you run out the thermal capacity of the factory WB

It retains an OEM-style installation while giving you everything you'd expect from a modern standalone:

Full sequential fuel and ignition control
Drive-by-wire - Complete control
VVT control
Flex Fuel
CAN integration (Including PRHT)
Advanced boost control - Closed loop
Multiple engine protection strategies
Built-in wideband (Optioned with a PNP 4.9 Sensor)
Extensive data logging - on board and PC.
Flat shift, launch control, rolling anti-lag and much more
8HP Integration using a CANTCU Module

Whether you're running a stock engine, a naturally aspirated 2.4L Scalpel build, a Rotrex, turbocharger, or a fully built race car, the Nexus provides room to grow without compromise at a motorsport level.

NEW: NC Miata Haltech IC7 Dash Mount - This has been a satisfying project to wrap up!

To complement the Nexus ECU, we've designed a dedicated NC Miata Haltech IC7 Display Mount.

Instead of universal brackets or custom fabrication, our mount installs directly into the factory gauge cluster location using the original mounting points and hardware.

The OEM trim panel then clips and screws back into place, resulting in an installation that looks remarkably factory while giving you the functionality of a modern motorsports display.

Features include:

Direct bolt-in installation
Uses OEM mounting locations
Reuses factory hardware
Factory trim reinstalls for a clean finish
Heat-resistant automotive-grade polymer construction
No permanent modification to the dashboard
Already Have an OEM ECU?

No problem.

Even if you're not ready for a standalone ECU, the mount also works with the Haltech IC7 OBD Display.

The IC7 OBD version allows you to monitor vehicle data over the factory OBD-II port while customizing pages, layouts, alarms, and display information. It's a great way to modernize the interior today while leaving the door open for a future standalone upgrade.







]]> NC Power mods Fab9 https://forum.miata.net/vb/showthread.php?t=802487 US vs Euro performance/tune https://forum.miata.net/vb/showthread.php?t=802357&goto=newpost Fri, 17 Jul 2026 18:58:16 GMT This came to mind when comparing calibrations on transmissions between US and Euro NC's. So I thought I would put it out there again(the only thread I could find is 16 years old)
https://forum.miata.net/vb/showthread.php?t=383243

Maybe there is new light on this now, especially since Romdrop has appeared along with several other tune options. I am assuming it revolves around the facts of OBDii US standards and Euro standards.

From what I could find the consensus is the Euro cars should in general out perform the US counterpart till around 2018. Although the specs for the NC show US made about 10/12 more HP over the Euro 2.0? Excluding the 1.8 Euro version from the comparison as US never got a 1.8L.

If I stated something incorrect, please correct it.

In general, what do you all say? ]]> NC Power mods djobes https://forum.miata.net/vb/showthread.php?t=802357 2.5 Longer rods or forged pistons to fix quench? https://forum.miata.net/vb/showthread.php?t=802347&goto=newpost Fri, 17 Jul 2026 00:30:22 GMT So I keep looking at the quench on the 2.5. Has anyone thought of just making a longer rod that reduces the quench and raises compression? Tell me if I am a idiot. So I keep looking at the quench on the 2.5. Has anyone thought of just making a longer rod that reduces the quench and raises compression? Tell me if I am a idiot. ]]> NC Power mods Focusedone https://forum.miata.net/vb/showthread.php?t=802347 starter went out https://forum.miata.net/vb/showthread.php?t=802346&goto=newpost Thu, 16 Jul 2026 23:34:03 GMT I believe my starter is out on my 06 Mx5. Had a 2.5 swap years back....do I use starter for the 2.0 or source one from a 2.5?

I looked at videos on U tube etc...didn't address. thank u ]]> NC Power mods bambam https://forum.miata.net/vb/showthread.php?t=802346 Selecting Tunner https://forum.miata.net/vb/showthread.php?t=802290&goto=newpost Mon, 13 Jul 2026 21:12:55 GMT I have emailed some tunners and never heard back. Who do y'all use? I really am not trying ot get every last hp out of my new 2.5. I want it to last forever. I also would love a tune that does not need hours on the dyno. ]]> NC Power mods Focusedone https://forum.miata.net/vb/showthread.php?t=802290 NC-2 ENGINE BLOCK https://forum.miata.net/vb/showthread.php?t=802188&goto=newpost Tue, 07 Jul 2026 12:51:25 GMT I understand that when the NC-2 came out the engine block was made stronger with several other changes to oil galleys. I also understand that the manual transmission cars had forged internals, at least the crankshaft. My question is did all engines, manual and automatic transmission, receive the... I understand that when the NC-2 came out the engine block was made stronger with several other changes to oil galleys. I also understand that the manual transmission cars had forged internals, at least the crankshaft. My question is did all engines, manual and automatic transmission, receive the stronger block?
I need to rebuild my manual transmission but I want to insure I have the stronger block. The automatic transmission core engines seem to be easier to find. Thank you. ]]> NC Power mods CodyMX https://forum.miata.net/vb/showthread.php?t=802188