Decoders

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Speeduino supports an ever growing number of crank and cam decoders and trigger wheels. This includes some of the more common OEM setups as well as those favoured in the aftermarket (Such as the missing tooth wheels).

The list below includes all those that are currently supported. They each lead to a page with details on using the decoder (These pages are a Work in Progress)

Decoder Applications / Description
Missing Tooth A crank wheel with 1 or more 'missing' teeth
Missing Tooth (cam) A camshaft or distributor wheel with 1 or more 'missing' teeth at half-crank speed
Dual Wheel Two signals combined from two different wheels
Basic Distributor Untimed pulses that are the equivalent of a tach or distributor pulse
GM 7X Multi tooth pulse
4G63 As used on many 4 cylinder Mitsubishis and NA/NB Miata / MX-5
GM 24X Commonly used on GM LS1 V8
Jeep 2000 6 Cylinder Jeep engines from '91 to 2000
Audi 135 Audi engines with 135 pulses-per-revolution
Honda D17 Honda 4 cylinder D17 engine
Miata 99 1.8L Miata/MX5 from '99 to '00
Non-360 A variation of the dual wheel decoder that can be used with tooth counts that do not divide evenly into 360
Nissan 360 360 tooth cam wheel used in many 4 and 6 cylinder engines.
Subaru 6/7 Subaru engines using the 6 tooth crank wheel + 7 tooth cam wheel arrangement

All signals need to be conditioned to a 3.3v - 5v dc square wave before being used by the firmware.