PDQ's MX5 MK3 NC 2.0 DIY Turbo Conversion

  1. My model of MX-5 is: NC1 2.0 RHD Manual 6spd
  2. I’m based near: Kent, United Kingdom
  3. I’m looking for technical help or recommendations on: components for the DIY conversion.

So having had a great year of track days I have decided to put together a turbo conversion for my MK3 NC. Here is the list of planned/used components, I will keep it updated with the parts I actually buy to help anyone else planning this:

Parts purchased & supplier: @04-DEC-21 > I have zero affiliation with any of the companies linked below, just linked to be helpful, will remove if against forum rules.

The PDQ Kit:

Exhaust & Manifold - subtotal £878.48

ECU & Sensors - subtotal £731.45

Turbo & Oil/Water Feeds & Oil Drain - subtotal £248.37

Intercooler, Pipework & Joiners - subtotal £275.90

Misc Parts - subtotal £85.49

Approx Running Parts Total: £2219.69

Parts still to source:

  • Turbo Water feeds
  • Air filter and pipe.
  • Upgraded organic clutch.

Plan is to gather parts over next 2 months and then do a weekend swap over - followed by mapping at the local dyno.

Weekend???
Must be one efficient worker…

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Might have a big S on his undercrackers !!! :laughing:

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Be fair, he has two months of prep ahead of the power burst, all ducks lined up in a row.
If you watch Wheeler Dealers or Car Rescue, you’ve seen it’s possible.
:grinning:

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I have done it over a weekend on other non turbo cars and completed many engine swaps in the past etc.

The ecu mapping won’t be done admittedly but I don’t see why I won’t have it started and idling.

Edit: Clutch will be done in advance……

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Interested to follow, as the turbos or supercharger packages are all 5k plus. Must be a cheaper diy option

I think the choice of turbo, ECU and mapper will be the variables in the list - I think the other parts are pretty much a defined cost.

My aim is 4K (not including the clutch)

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Injectors purchased Deatschwerks 550cc £250 new from a friend in Germany.

these were not used in the end and resold. Other injectors have been purchased later in this thread.

You need a spreadsheet with the parts all listed :slight_smile: OK you don’t really but the rest of us do so we can borrow your list and see what’s involved :slight_smile:

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ECU Confirmed as the NC version of the ME442 with an adapter harness. Ready to go :slight_smile:

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This weeks task is to work out the oil drain from the turbo back into the sump.

Has anyone any suggestions for the NC?

I found 3 possible options. Option 1 Use an AN10 M14x1.5 Adapter into the OEM sump plug location like Fab9 do. Option 2 drill a hole in the sump a few cm above the standard sump plug location like BBR do. Option 3 drill a hole in the block and drain into that just below the 2.0L stamping on the block.

I see BOFI racing now have an NC they are going to turbo as a YouTube series.

Be interesting to see what issues they uncover that I can try and learn from.

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Parts arrived….manifold & downpipe.

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Turbo arrived has arrived:

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Seems it’s really hard to find in depth conversion guides for the NC…. Will document the install process when I have cobbled together all the parts.

This was useful: DIY Turbo Build: My Journey - MX-5 Miata Forum

So it seems he drilled and tapped the sump for the oil drain - I suspected as much but wasn’t sure. I am hoping I can get away with one of these kind of things instead, ideally replace the sump plug with one but then I wasn’t sure the turbo would actually drain properly into it?

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Cheers great thread

I found another helpful blog post :

https://forum.miata.net/vb/showthread.php?t=678241

Nice box arrived from Motorsport Electronics today with the updated ME442 for the NC and the NC specific harness adapter.

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Turbo Oil Feed

I have been thinking about this and it seems the best option is to get an Oil Pressure switch adapter with the additional port.

Ideally something that allows the T-piece section to be mounted up where I can get to it to monitor leaks etc

Then run the turbo oil feed from that. So now I need to work out what thread etc that adapter needs to be and how long the turbo feed line needs to be. Any info welcome.

Update: 1/4" x 18 NPTF

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Today the adapter arrived that goes between the stock oil pressure sensor and the block. £12 approx

I have now ordered a 90cm braided hose to connect to that adapter and bring oil up to the turbo. £25 approx