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Discussion Starter #1
Hi,

So over the last 6 years or so I've had 7 MX-5's. Three of those have been track cars.
I've had this particular NB for the longest, about 3 years now.
And while it has been a great, reliable and capable track car, there comes a time in a little boys life when he must become a man.

I have decided it is time to go turbo.

Figured now was a good time to make a thread here so you can all tell me what I am doing wrong... because lets be honest I have no idea what I am doing.

So anyway, I have had plenty of fun with the car to date, it has always been competitive against stronger competition and is usually one of the fastest MX-5's (It's an MX-5, I'm from Australia) at the track days I attend.

Some history to get things going. I bought the 01' JDM imported NB with standard VVT motor.
It was missing a lot of bits, but that wasn't an issue as it was going to be a dedicated track car and would be stripped down anyway.


Off to fit cage:


Pretty much as was when i took it for its first drive:


At this point the car was running the factory NB VVT Motor, 6 speed gearbox, Torsen 4.1 diff and running factory ECU. NB 'sport' brakes, cheapo BC Coilovers, a bigger front swaybar.

Bonnet, roof and boot are carbon/fibreglass items.
Note these were all made with the guidance of 'Lightyear' - here is the first lightyear fastback that was made, which currently still sits on this car.


After about 6 months i needed more grip so a Wing, Flat Floor, Side Skirts, and larger front splitter happened.


This gives perspective on the width of the side skirts


The car certainly is nice to drive around sunny Phillip Island:


And even not so sunny Phillip Island (the car makes a mean rooster tail):



Anyway the point of the thread was to discuss the turbo bits that are about to happen.
If you are interested, there is more history on the car on the Aussie MX-5 forums, sadly thanks to Imageshack going 'paid service' some of the older pics have been lost:
mx5cartalk.com - BEAVIS' White Track Car
 

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Welcome sir! The NB looks great, really like the fastback and aero parts! :icon_cheers: Hoping to do some aero this year myself! :) Look forward to the turbo setup, any idea on the setup..like diy or? :dunno:
 

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Pretty cool looking wing setup and sideskirts. Would love to see more detail on thr aero bits.
 

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Discussion Starter #6

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Nice, saw pics of the rear aero way way back. Nice to see more pictures of it.
 

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Discussion Starter #10
So welcome to 2016 - year of the turbo.
This is more than just 'bolt on a turbo' thread.... there's always something that needs fettling or upgrading or that needs to be lightened.

So first thing I did recently was some 'simplification' to the dashboard. Cut out anything that wasnt really necessary, but kept just enough to keep it still looking like a dash.


Bought some Wilwoods and big rotors from Trackspeed.


Almost installed them as you can see below, bit of a comparison on sizing compared to the factory 'big brakes' that came factory on the NB8B ... but then I donated them to another cause so I'm awaiting another set to arrive ... hopefully soon.


I started thinking about reworking the radiator mount to help accommodate the intercooler. I have cut the front support away and replaced it with box tube, not sure if i really needed the box tube but I figure better to play safe for now. I know others have run cars without a brace between the rails. Please ignore my sh*t welding.


I lowered the factory radiator brackets by bolting them to the spot where the antirollbar brace bolts. You can see the existing holes ~20mm above.


And I have bolted a length of aluminium angle between either end of the now lowered radiator supports so I could mount the intercooler.
Its a 460mm x 320mm core. With the end tanks, inlet to outlet it's about 600mm and fits nicely between the rails of chassis.
There's about a 10-20mm gap between the radiator and the intercooler.


Pulled the head off to swap the NB8B (01-05) headgasket for an NB8A (99-00) headgasket purely to best suit a coolant reroute. (HG part # is BP26-10-271)


Underneath the valve cover all looked pretty nice and shiny really.


While the head was off, I painted the valve cover - pretty satisfied with wrinkle black


The guts of the motor all back together again. (swapped timing belt, water pump etc while i was there.


I have swapped the front and rear radiator/thermostat housings/outlets.
Nice easy routing of my coolant reroute hoses. The two radiator hoses I used are Gates #21864 and Gates #22382. Between them is a 300mm length of 32mm diameter aluminium tube.


Bit of an overview of how things line up. You may see I bent up a little steel bracket which bolts off the throttle cable bracket to hold the aluminium pipe and then wrapped it in some old hose for protection. It is certainly tight behind the intake manifold thanks to brake and clutch master cyls.


Theres about 3mm gap between the firewall and the rear hose. You can see the way the outlet that used to live at the front of the motor is now at the rear and points in an upward direction. The thermostat is at this end of the head now.


Should have some more stuff happening over the next week or so....
 

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Looking good, nice to see decently done DIY aero. Also love the lightyear fastback.

Just a heads up, if the cage was finished in that pic, it's missing a critical main hoop diagonal.
 

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Discussion Starter #12
Just a heads up, if the cage was finished in that pic, it's missing a critical main hoop diagonal.
Yes the cage is complete, and I purposefully omitted the bar in question.
I am not sure if I would consider the diagonal quite as critical as many may think.
But I'm no engineer so I'm probably wrong. :D
 

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Discussion Starter #13
Small update on whats been going on - Wiring and Intercooler.....


I was sick of all the ugly stock wiring on the front end so I started tracing, cutting and pulling wires back through the firewall.
I did a LOT of depinning and tracing to check i wasnt going to remove something that'd prevent the car from running.
I think these are AC relays, dont need those...


Depinned AC relays


Even the Diagnostic Connector that normally lives on the left hand side of the engine bay got depinned and pulled into the cabin.


Collection of wires pulled back into the passenger footwell...


And the end result was no more wiring on the exhaust side of the engine bay, with the exception of the ABS sensor and some wires for headlights:



Likewise on the intake side


And a healthy pile of leftovers to clean up later.


While i was at it, I relocated fuse box a coule of inches further into the corner of the engine bay. I think it neatens things up, although slightly impractical. Particularly given now I can only open the lid by unbolting the fuse box, but its a simple 30secs with a 10mm socket to get it out so eh.


While I was in the mood for depinning things, I ran some braiding over the wiring for the connectors on the front of the motor.


And thought I'd show some more detail on how the intercooler is mounted.


Upper bracket extends up to the top radiator panel


Front shot, not the fitment between the chassis


You can see here the gap between radiator and cooler - also note the aluminium angle running under the intercooler.


The lower bracket
 

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Discussion Starter #16
Long overdue for an update.... sorry for the slowness.

Continuing with some of the electricals on the car.

First up i've had the ECU apart to get a USB port in the thing.
ECU innards


The ECU has usb pins labelled on the board. Really, I don't know why they didn't just unclude a USB port as part of the build.


So I simply sacrificed a USB cable from an old PC to make my own ECU USB plug


And I had to rock out the TunerStudio to update the ReqFuel value in the ECU to accomodate the larger injectors.


Next part of the electricals was neatening up some more of the wiring on the car.
A whole heap of wires cut from the loom draped over a very dusty car (note the passenger seat has been replaced with wires)


I grabbed some of the Wiring spiral wrap stuff which comes with a somewhat unusual looking plastic installation clamp tool whatchamajig.


And with these Wiring clamps


I end up with something of a neatend firewall.


And the other thing that I've been tinkereing on over the last few weekends has been running oil lines for the cooler and filter.
This gives you an idea on how I've run the Oil cooler. I will come up with some sort of clever ducting once i have the front of the car back on.




Top shot of cooler and filter. The filter is bolted with an alloy bracket to the frame, quite nice and neat and mostly out of the way, yet much easier to get to than the stock spot.

Reasonably happy with how these are done as the lines are short, discreet, should minimise chance of issues, and should work properly.



I've sorted the Turbo drain barb in the sump:





Oh yeah, finally got the Trackspeed Wilwoods installed, pretty straight forward stuff really:






In other news, I may have actual genuine proper legit turbo bits coming in the mail soon.
 

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Discussion Starter #20
Wow, Miata on Phillip Island. We only see the motogp bikes on it over here.
Ohhh yeah, plenty of 4 wheeled events at Phillip Island throughout the year.


Also, Just a quick update.
Trying not to reveal too much of our secrets, but starting to think about a new rear wing...
 
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