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Where does missing tooth on trigger wheel go?
Documentation says "You will need to install the trigger wheel so the missing tooth is a specific number of degrees ahead of the VR sensor when the engine is at top dead center"
But "ahead" is ambiguous. Does this mean that the missing tooth has already passed the sensor before you get to TDC? Or that the missing tooth doesn't pass the sensor until after TDC? I suspect the 1st interpretation but looking for confirmation. Thanks |
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11-05-2018, 03:58 PM
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Work in Progress
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I just installed an electromotive kit with a clewett crank pulley and trigger wheel. On my setup the missing tooth is before the top dead center point. So yes the missing tooth will pass the trigger then go past tdc.
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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11-05-2018, 05:20 PM
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Which EFI system are you installing?
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1988 Porsche 930 Targa - 3.4L Twin Plug Motor, DC 13 Cams, Supertec Head Studs, ARP Rod Bolts, Port and Polished Heads, Garretson Andial Intercooler, GSX 61 BB Stage 5Turbo, Tial F46 WG .8 Bar Spring, PowerHaus Headers, Rarly8 Dual Tip Muffler, MS3 Pro EFI conversion, 85lbs. Injectors, Center Force Stage 2 Clutch , Rebuilt 4 Speed with LSD. |
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11-05-2018, 05:48 PM
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912-6 Turbo
Join Date: Jun 2014
Location: Toronto, Canada
Posts: 99
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The missing tooth should have already passed the sensor before the engine reaches TDC on cylinder #1. You should be able to input the appropriate degree amount in to the software for the offset between TDC #1 and where your sensor is located.
The ECU needs to know that it has "X" degrees of rotation before TDC #1 comes up so it can prepare injection and ignition events appropriately. The missing tooth is like a countdown timer before TDC #1 is reached.
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1966 912 Turbo - Carrera 3.2L - GT3076R - Bosch 044 - Intercooled - 55lb injectors - 0.5 Bar - Tial F46 - Magnesium 915 7:31 - BBS E26 15x9, 15x10 - Link G4X Fury |
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11-06-2018, 08:58 AM
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Install the missing tooth at tdc and if you are using the going super fast or the clewitt vr adapter it will place it at around 48 degrees btdc which you will verify at initial startup with your timing light
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88 930 3.4 ,Twin plugged billet Xtreme cylinder heads and denso COPs, Dougherty custom GT 2 evo cams,pauter rods,Garrett Gt40,ms3x Efi ,1100cc injectors,extrude honed 3.2 intake,TK billet fullbay I/C,MODE headers,KEP stage 2, E-85, 706 rwhp |
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11-07-2018, 02:57 AM
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Quote:
Oh, microsquirt. Actually its 60-2 so missing teeth |
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11-07-2018, 01:47 PM
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