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Summary of change:
Information on the Toyota 4age timing system - distributor driven. These have a potential market for Corolla (AE86 and newer, and MR2) http://www.autoshop101.com/forms/h23.pdf Some decent scope traces. http://www.jamesmccombe.com/tube/Cars/MR2/ImageLibrary/Thumbnails/Drivetrain/EngineManagement/DistributorTesting/ContactSheet.shtml ''two ways I would do it'' ''1) use is in 'coil type trigger' mode any only use the G signal''. Apparently this is not enough even for wasted spark (just distributor). OR ''2) grind off one of the teeth on on the 24 tooth wheel and run 24-1 and only use Ne signal'' ''3) use both signals as is (Ne as primary trigger, G as secondary trigger), and make some firmware modifications'' [PhatBob] What sort of modifications? I still cannot see how we'd know where 'home' is without a missing tooth pulse. Sounds like a simple setup: * LM1815 for primary trigger * LM1815 for secondary trigger This way we get a similar crank and crank-signal pulses to the processor as the HALL signal of the mazda-BP engine (eg. MembersPage/Fero ) has by default (without LM1815 of course). Any info about the position of primary trigger falling edge ? If it's >50 crankdegrees BTDC, than it is supported without any firmware modification. Here's a diagram of the type of trigger found in European and JDM Toyota 4A-EG engines. http://vems.hu/www.vems.co.uk/VEMSWB/Toyota4AEGSignals.gif This would be a good one to get working as there are a large number of these engines used in Motorsport, apart from Toyota MR2, Corolla and Tureno these engines are used in Mk1&Mk2 Ford Escorts as they are the same as the Cosworth BDA engine.
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