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Discussion Starter · #1 · (Edited)
Hi !

I'm Globule, and I own a '90 miata since a few month.
I bought this car for weekend ride in the Alps and trackdays

The car is 150000 km (a bit more 90000 miles) and was stock.
I added a few stuff to go on track :
  • TR Lane rollbar
  • Cusco strutbar
  • Home made lower bracing
  • Koni suspensions with Eibach springs
  • 15 inch wheels with 195/50 Toyo T1R
  • EBC redstuff brake pads
  • Flyin' Miata recommended alignment (to begin)
  • Ignintion timing to 14 degrees BDTC
  • RX7 AFM + BMC aribox and custom piping

There is still work to do, but that's it for now !


(before the rollbar was installed)
 

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Some nice sensible mods there, welcome to Nutz.
 

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Welcome! I'd love to be able to do Alps weekend trips easily! the best I get is day trips out of London


rememebr pics of your drives and the Alps!
 

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I live at the bottom of the "Vercors" it's here : Vercors
So We (a local french forum called bombinettes-80) often go driving in this area, having lunch in a montain pass...
Now that is what I call a good place to live! I worked a winter season in L'Alpe D'Huez many years ago. Must be great being able to get up to the mountains for skiing/boarding at weekends in the winter and great drives in the summer.
 

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Lovely part of the world that, my mother in law lives near Crolles so I will be down there in the summer in the MX-5 for my first top down Alpine fun!
 

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Discussion Starter · #12 · (Edited)
After a year without news, a baby girl and a new house, I put the MX5 out for a trackday in the south of France with the guys of the club "Bombinettes-80"

The track was the "Pole mecanique Ales-Cevennes"...

Track informations here => http://www.pole-mecanique.fr/portal/portal/polemeca/circuits/vitesse (in french sorry)

Well, a lot of beautiful cars and a full day of fun !!!

Here a few pics...





 

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Discussion Starter · #13 · (Edited)
Hi everyone !

After a lot of driving, a few trackdays and somes changes here and there (front lip, ducktail, full exhaust, bucket seats, ...).
I finally decided to go standalone and bought a Speeduino (mainly to get rid of the old 80's style intake and AFM).

So I removed to old ECU and put the Speeduino instead.
Automotive tire Hood Motor vehicle Road surface Asphalt


While installing the Speeduino, I also added a USB cable attached below the glove box (barely visible if you don't know it's here).

As you all know, this kind of newer ECU works with :
  • a MAP sensor pluged in the stock plug in the intake manifold (the MAP sensor is build in the ECU)
  • a temperature sensor (a GM sensor is plugged in the intake tubing from the stock AFM temperature signal
)
  • a throttle position sensor (a BMW sensor is plugged instead of the stock one)
  • a O2 wideband (I decided to go with 14point7 spartan2 wideband controller without the gauge for a cleaner look)

MAP hose
Motor vehicle Automotive design Automotive exterior Bumper Automotive fuel system


Temperature sensor
Green Cylinder Gas Plastic Terrestrial plant


Throttle position sensor
Automotive tire Motor vehicle Rim Automotive exhaust Automotive fuel system


Wideband
Gadget Peripheral Cable Composite material Wire



About the wideband, I made a few research and couldn't find a simple answer regarding how to wire it.
So I made a few tests and finally I did that :
  • the O2 signal is wired directly in the stock location
  • the heater ground is wired on the main engine ground behind the exhaust manifold
  • the switched 12V is wired in the 4 wire plug between the brake booster and the relay box (Left Hand Drive french car)
  • the signal ground is plugged on the shared ground below the brake booster (Left Hand Drive french car)

This last ground I am not sure if it is the correct place to wire it.

Controller near engine ground
Motor vehicle Automotive design Automotive exterior Automotive tire Gas


12V and signal ground
Electrical wiring Automotive tire Gas Audio equipment Trunk

(It is a bit messy, but as I am not sure of the wiring, I will trim the wires when I am sure everything works properly)


For now, the engine starts, but the idle is not great and the car will stall when cold, but it is fine when hot.


I am currently struggling with tunerstudio to make the car run smoother.
The AFR mesured is completly off (10.X) when the target is 14.7 (and it smells unbunrt fuel).


If there is anyone here that know a thing or two about it,
  • I would like your advice on the signal ground I did above
  • and how to make tunerstudio try to match the AFR target (I may have missed something in the tune).

 

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Discussion Starter · #14 ·
Hi all,

During the pause for winter and Xmas holidays, I have been looking at my tune and some advice on the forum and I came across so many bike ITB conversion that I am about to give it a try for maximum intake shortness and awesome sound.

I have to find some ITB and figure out a custom intake, then I will make it all work and finally come back to the tune with ITB.

I may come back for a few questions during the process 😁
 
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