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Mazda 323 GTX MegaSquirt Install

“Power is good, more is better, too much is just enough.”

By Ethan Ott for SpitfireEFI.com

/// Introduction

I finally acquired my GTX about two years ago after passively lusting over this rare beast for many

years prior. I never thought it would come to pass, but by chance it just fell into my lap. As all GTX

owners know, the handling is impeccable –

likely one of the best handling cars I've owned

– and the power-train is certainly peppy, but

leaves significant room for improvement in the

go-fast department.

Needing a distraction from my regular, long

term car project, I decided to give my GTX a

kick in the butt.

The plan was to go through the motor, upgrade

the turbo, free up the exhaust flow, ditch the

restrictive MAF, and fit a MegaSquirt

controller to deal with twice the normal boost

levels.

/// Scope

This write up is intended to severe as documentation of my project and act as a guide for others looking

to do similar work. I think those following along at home will find the technical details surrounding the

MegaSquirt (MS) setup and tuning the most daunting, so that's where I'll provide the greatest detail. To

that end, I plan to cover MS board and version selection, circuit mods, wiring, and tuning in as much

detail as possible so that this can serve as a reference guide for others.

The final setup completely removes the stock ECU and restrictive MAF unit. The MegaSquirt unit

controls all fuel injection and spark advance, as well as the fuel pump, and uses the stock coolant temp

sensor. In addition, MegaSquirt run closed loop boost control (@20psi), closed loop idle control on the

stock idle valve, and the stock turbo boost light. With the addition of a wideband oxygen sensor, the

motor is running closed loop fuel control at part throttle for increased cruising fuel economy. The

engine is tuned and runs 20psi at 12:1 AFR on the stock 350cc injectors.

Though I made quite a few modifications to hardware components, I will only cover the modifications

necessary for the MS conversion. Brake upgrades, turbo manifolds, intercoolers, and plumbing mods

have all been part of this project, however I feel these tasks have been discussed at length elsewhere,

and are not integral or necessary for a MS conversion, and are thus out of scope for this document.

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Inhaltsverzeichnis

Seite 1

Mazda 323 GTX MegaSquirt Install “Power is good, more is better, too much is just enough.”By Ethan Ott for SpitfireEFI.com/// Introduction

Seite 2 - MS2 v3.0 Running MS2-extra

The extra components for the boost control circuit modification, as well as the control valve itself, can be purchased in a kit from DIYAutotune.com h

Seite 3 - GM IAT Sensor

I cut each of the necessary wires a few inches back from the stock ECU connector and soldered new wires to each one. After I had all the necessary wir

Seite 4 - 1G DSM Blowoff Valve

Tachometer Gage DriveThe tachometer gage on the dash was originally driven off of the stock single ignition coil. Every ignition event a pulse was sen

Seite 5

/// Tuning I recommend reading through the MS2-Extra Tuning Guide here:http://msextra.com/doc/ms2ex

Seite 6

/// Hardware Upgrades While the GTX was off the road for “repairs”, I took the liberty of upgrading a number of the com

Seite 7 - Ignition Output Modification

GM IAT SensorThe stock GTX intake air temp sensor is integrated into the MAF sensor, which will go by the way side in favor of MegaSquirt's speed

Seite 8

The stock setup uses a single coil to fire all four spark plugs. I elected to scrap the stock igniter and install a dual coil unit. As the name implie

Seite 9 - Boost PWM Control Circuit

/// MegaSquirt ECU Constructi on As discussed previously, I selected a MS2 v3 setup for my GTX project. This combination gave me t

Seite 10

Step 62 – PWM Q2 and Q4Since I will be controlling the stock GTX PWM idle valve, I followed the instructions in this section marked “For PWM Idle Valv

Seite 11

Step 71 – Current Limiting – INSTALLThis step installs components that limit the current to 14amps which is more than enough to power all the MS drive

Seite 12 - Tachometer Gage Drive

Seite 13

Boost PWM Control CircuitTo control boost, MegaSquirt controls a valve that sits inline with the vacuum line that runs to the turbo waste gate. By con

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