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== 4A-EG Trigger == These have a potential market for Corolla (AE86 and newer) and MR2. These engines are used in Mk1&Mk2 Ford Escorts as they are the same as the Cosworth BDA engine. 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. Information on the Toyota 4a-eg timing system - distributor driven. http://www.autoshop101.com/forms/h23.pdf ---- 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 In its simplest form we can use the G trigger and set VEMS as a coil type ignition For batch fire and wasted spark we can grind teeth from the Ne trigger. The signals are generated from the distributor, which means that the 24 tooth wheel runs at 1/2 engine speed. Therefore we'll have to grind 2 teeth off the Ne trigger 180 degrees apart. To make a fully sequential system we can grind three teeth from the G trigger. ---- == Config - Coil type == ---- == Config - Batch type == ---- == Config - Fully Seqential == [Insert config lines here]
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