So I've had VEMS for nearly a year now and I am finally getting around to installing it in my Coupe to get some time tuning with it before I put my built turbo motor in. Unfortunately I forgot what level ignition drivers(either 6 high and 2 logic or 8 high, can't remember) I got and if my board(I think its 3.3) has the cam hall sensor inverter. What components do I need to look for to confirm this? Also, I will be changing from the factory Audi trigger system to a 60-2 flywheel soon and was wondering if there were any hardware changes to be made or if I just needed to change software settings in megatune/VEMStune.
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1990 Audi Coupe - 7A for now -
Marc Swanson
Proprietor, EFI Express
95.5 //S6 Avant
90' Coupe Quattro V8 4.2L twin turbo
93' //S4
83' UrQ
97' F250 7.3 diesel
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So if mine has 4 does that mean I have the 6 IGBT and 2 TTL drivers? or just 8 TTL?
And V3.3 didn't have the cam hall sensor inversion stuff yet right? Or is there a way to tell if mine did?Last edited by ShadowofBob; 5 February 2010, 19:49.1990 Audi Coupe - 7A for nowComment
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most Audi configs are setup with 6ttl, FWIW. There are 6 drivers per "row" , so if you only have 4 screws on your ecu the most you would have would be 2 IGBT drivers.Marc Swanson
Proprietor, EFI Express
95.5 //S6 Avant
90' Coupe Quattro V8 4.2L twin turbo
93' //S4
83' UrQ
97' F250 7.3 diesel
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on the cam hall inverter, its a chip that would be wrapped inside a piece of heat shrink with jumper wires between it, the motronic connector, and the vems main board. You'd have to open the ECU to see it.Marc Swanson
Proprietor, EFI Express
95.5 //S6 Avant
90' Coupe Quattro V8 4.2L twin turbo
93' //S4
83' UrQ
97' F250 7.3 diesel
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I have a standard VEMS box, no motornic connector since this is going into a 7A coupe. So I don't really think it would necessarily have many TTL drivers. I'll check for the inversion bit too.1990 Audi Coupe - 7A for nowComment
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Also while looking over my wiring diagram I realized I need to run a flyback line from pin23 and I got to thinking, how the Motronic VEMS box handles this or does it somehow avoid running one?1990 Audi Coupe - 7A for nowComment
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No one knows? Kinda need this info since I am starting to build my VEMS to 7A harness this weekend.1990 Audi Coupe - 7A for nowComment
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On most modern engines flyback provisions are built into the wiring harness. The AAN is setup this way, but the 3B is not. To get around this, a relay is used inside the 3B configuration boxes to isolate the injector power from the rest of the loads so that flyback can be taken off the input ignition 12v line.
I built a custom plug and play 7a ecu for a customer a while back, and in that case I opted to have him splice into the 12v line on the injector +12v rail to avoid the issue entirely. Its not very hard to do, and you need to run an extra harness anyway for the wideband o2.Marc Swanson
Proprietor, EFI Express
95.5 //S6 Avant
90' Coupe Quattro V8 4.2L twin turbo
93' //S4
83' UrQ
97' F250 7.3 diesel
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Okay, that is all I was wondering about. Like you said I need a harness for coil packs and WBO2 anyways so no big deal. Just have to figure out the logic level or high output stuff now. Found a section on the wiki about how to check for the hall inversion stuff when in the car. I haven't had luck finding the info in the wiki on switch from AudiTrigger to 60-2 though.1990 Audi Coupe - 7A for nowComment
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Its all explained in here:
there are two solder blobs you will need to remove, notated SJ"X". you then can look at the v3 schematic to find out where on the board the jumper is. You'll want to look at both the top and the bottom drawings. you can do a simple pdf search for the text of the SJ"X" label to find it.
grab the correct schematic for the version of your vems here: (usually v3.x, if its auditrigger its going to be most likely at least v3.3):
hope that helps.Marc Swanson
Proprietor, EFI Express
95.5 //S6 Avant
90' Coupe Quattro V8 4.2L twin turbo
93' //S4
83' UrQ
97' F250 7.3 diesel
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