Main Index of MS2-Extra Manuals

Layout of Components -- Suggested Supply points -- List of common components and part numbers

There appear to be 3 different wheel configurations using the 24 toothed wheels in the distributor, these are mainly found on the Toyota setups and RX7's.

4 Toothed Wheel (Toyota VAST) distributor (2S-E, 22R-E, 22R-TE, 4Y-E and 4A-GE engines) this should be setup as a distributor as the 4 teeth areat 90deg and therefore perfect for the Basic Trigger code, see HERE
Note: The 4A-GE engine has a second VR output (G) this can be ignored, just use the Ne output (4 toothed sensor)

24 + 1 Toothed Wheel (Toyota ESA) inside the distributor using either 2 or 3 VR sensors (Ne, G1 and G2), depending on model. With the 3 VR sensor distributor we are only concerned with 2 of the sensors, one which reads the 24 teeth and one which picks up a single pulse per revolution.
On 4 cylinder engines the third sensor (G2), which also picks up on the single tooth, will be redundant.
On 6 cylinder engines the G1 signal is for cy#6 and G2 is for cy#1, so it is recommended to use G2 instead of G1, therefore making G1 redundant.
This gives the signal for 4 and 6cy engines a 24+1 at cam speed. (Ne + G)

24 + 2 Toothed Wheel (RX7, etc) This is similar to the above in that it has a 24 toothed wheel, but there are also 2 teeth at 180deg apart rather than a single tooth.

Internal Wiring for 24 Toothed Sensor -- Internal Wiring for Single Tooth Sensor -- Schematic Diagram -- Tuning Software Settings

Internal Wiring

Spark output comes on D14 (or D14 and D16 if you want to go wasted spark), see HERE for options on driving the coils.

V3.0 PCB (24 toothed sensor)

For Second Input (single tooth sensor) see HERE

V2.2 PCB (24 toothed Sensor)

For Second Input (Single tooth Sensor) see HERE

The circuit below will need to be made for a V2.2 board for the Crank Sensor

Second Trigger Input (Single tooth Sensor)

Second VR conditioner Circuit - this needs to be built.

Please note: Above part numbers will need checking, some components will come with a minimum order in multiples of 5 and 10.

Second VR sensor input on pin3 of the DB37 connector on a V3.0 PCB
Second VR sensor input on pin25 of the DB37 connector on a V2.2 PCB

Tuning Software Settings

24 + 1 Wheel Settings (Toyota ESA)	24 + 2 Wheel Settings (RX7)

Distributor Based Setups	Wasted Spark Setups

                  
                  

Please note the Tooth #1 Angle will depend on how youve fitted your distributor, ensure you check timing with a strobe as soon as you start the engine!!

If using VB921's for direct control over the coils then set Spark Output to Going High (Inverted) and set dwell to Standard and 3.1mS as Maximum. Also set 6.0mS as Cranking Dwell.

Spark output comes on D14 (or D14 and D16 if you want to go wasted spark), see HERE for options on driving the coils.

Suggested points for Supplies inside the V3.0 ECU

Component Pinouts

Pull up circuit diagram

List of component part numbers used in the ignition section:

Please note: Above part numbers will need checking, some components will come with a minimum order in multiples of 5 and 10.

If you have a question, comment, or suggestion for this FAQ please post it on the forum.

No part of this manual may be reproduced or changed without written permission from James Murray, Ken Culver and Philip Ringwood.