Daddy's Little Helper Tuning the Miata

Project Miata Update

Here is a screenshot of a video I took with the timing light to verify my ignition timing. Initially I set the base timing using the Trigger Wizard per the MS Labs instructions. This was just a sanity check to make sure that when the ECU is commanding 14* BTDC at idle the crank pulley timing marks agree that it is in fact at 14* advance. The red marks on the timing belt cover are T and 10 (ProTip: paint the lines white or red so they’re easier to see). You can use either the T mark on the timing […]

Project Miata Update

So I’ve been talking with some other Megasquirt users to request help getting into the ball park with my tune, share ideas and help validate my work so far. omgpham and Valvecovergasket were nice enough to share their tunes with me. And Reverant at MS Labs finally responded to my email with some AFR1, VE1 and Spark1 tables that were scaled for TPS. The maps in his original base tune were scaled for kpa, which is completely meaningless for Alpha-N. But he also admitted he’s never tuned an ITB car before and the tables were just best guesses. I can’t […]

2017 Project Miata Goals

Tune the Megasquirt ECU Drive the car a lot, gather lots of data, refine the engine tune Take car to a load bearing chassis dyno for even more engine tuning Install new brake discs and pads all around Reattach Redline Goods leather gauge hood cover where it is coming loose Modify instrument cluster so that the lights behind the tachometer are more diffuse so all the numbers on the gauge face are illuminated, possibly install LED bulbs Install Revlimiter anti-glare lenses for my KG Works instrument panel cover Install new door panel interior trim (upper and lower panels, door pulls), […]

Project Miata Update

Check original base tune setting for CLT thermistor setting. So which is it, Mazda or RX-7 S4&S5? So I read some old posts on and Braineack says several times to use RX-7 S4&S5. Every time I go to Tools –> Calibrate Thermistor Tables and set CLT to RX-7 S4&S5 and write it to the controller, when I open it back up again it shows that CLT is set to RX-7_AFM(S5 in AFM). Both Common Sensor Values share the same data tables so I’m thinking this is just a bug in Tuner Studio.   Figure out why MS3 is not […]

Project Miata Update

Figure out why MS3 is not reading NB cam sensor. Could be bad sensor or bad wiring between sensor and CAS harness. So I think I fixed the cam position sensor (CMP) issue: power and ground were apparently swapped by mistake due to misread wiring diagram (sensor pigtail has three black wires so no help there). I Googled pictures of exemplar 1999-2000 Miata engines and zoomed in on the CMP sensor to verify the OEM wire colors.   Apparently when reading wiring diagrams, the view is as though you’re looking at the back of the connector where the wires go […]

Project Miata Update

The plan is to tow the Miata from my dad’s house to my house after Thanksgiving so that instead of hibernating in a cold garage all winter long, it can stay cozy and warm in my garage where I can begin the painstaking process of tuning the ECU as time permits. Our winters are generally much more mild and thus more conducive to working on cars. Also, we have a lot more dyno facilities in my area. The goal is to street tune the car. Then once the car is generally drivable and I better understand the ins and outs […]

CB350 Fuel System Plumbing

I’m using a Pingel Power-Flo On-Off “Race” fuel valve with a 5/16″ outlet. My Mikuni VM30 carbs are designed for a 5.5mm ID fuel supply hose. Given the size mismatch I needed to find a way to step down the hose size from fuel tank outlet to carb inlet. To do this I routed the fuel as follows: From petcock through 5/16 Tygon F-4040-A hose to Jiffy–tite dry break fuel system quick disconnect (-5 AN inlet, -5 AN outlet). From quick disconnect to Pingel 1-in 2-out fuel filter. Conveniently, the fuel filter is 1″ in diameter so I use a stainless steel […]

Dashboard Pipe Holder

I stumbled across this charming 1925 Morris Oxford Long Wheelbase “Bullnose” Tourer auctioned by H and H at the Chateau Impney sale in Droitwich Spa, Worcestershire, England back in 2014. In the auction catalog I spotted this picture showing the most charming dashboard pipe holder and ash tray. I can see it now, a gentleman motoring down a narrow country lane, wearing a tweed jacket and cap, pipe clenched between his teeth. How very 1920s British!