Yesterday something strange happened.
I was experimenting with ASE. The car started OK. Then I stopped the engine, disconnected the laptop and tried to start it again.
After cranking for 10sec. i stopped and left the key on contact - then LED 17 remained on and the VB921 connected to it burned immediately.
The code was 29g1 on MS'n'Se Board 2.2. MT was not connected
So, I was wondering whether using a capacitator on the Base to pass only the impulses can protect the VB921?
VB921 Burned
Moderators: jsmcortina, muythaibxr
VB921 Burned
AE86 4AGTE REDTOP V3 Board; ms2extra_1.0.2-release
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Sounds like you do not have "spark output inverted". Additionally take you coil+ from the fuel pump relay. This ensures that no current can flow when during "key on, engine off"
James
James
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Spark inverted was "Yes". The engine started several times and it was OK. Then suddenly VB921 burned.
I'm actually using great part of the OEM harness and moving the coils to the FP relay is not so easy. However the VB921 burned even before i heard the click from the FP relay so it would have died anyway.
I'm actually using great part of the OEM harness and moving the coils to the FP relay is not so easy. However the VB921 burned even before i heard the click from the FP relay so it would have died anyway.
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That's odd. When we first started using the VB921, RyanPzz did some endurance testing and had a VB921 on current limit for 30 seconds before it failed.Bad_Dog wrote:Spark inverted was "Yes". The engine started several times and it was OK. Then suddenly VB921 burned.
I'm actually using great part of the OEM harness and moving the coils to the FP relay is not so easy. However the VB921 burned even before i heard the click from the FP relay so it would have died anyway.
The FP relay should turn off within 2.5 seconds of no cranking or about 0.5seconds during run. So the VB ought to be fine.
How good is your heatsinking?
Fitting a capacitor to the base will likely do strange things and I would not advise it.
James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Thanks, James.jsmcortina wrote: That's odd. When we first started using the VB921, RyanPzz did some endurance testing and had a VB921 on current limit for 30 seconds before it failed.
The FP relay should turn off within 2.5 seconds of no cranking or about 0.5seconds during run. So the VB ought to be fine.
How good is your heatsinking?
Fitting a capacitor to the base will likely do strange things and I would not advise it.
James
The VB's are put on the top of the MS box(inside). The VB burned for something like second ot two with blue smoke and typical smell. it might have been a faulty VB.
Today after driving for an hour I took out the MS box and opened it. The VB were pretty cold on touch.
AE86 4AGTE REDTOP V3 Board; ms2extra_1.0.2-release
Today I burned one more VB921.
After driving the car for 2000 km without any problem I burned one more VB921 during cranking. Currently I'm using 029l code. When using 025 style wheel decoder the starting is hard.
I have two coils and two VB's respectively. However, only one of them died (Spark A). I have no reasonable explanation. After I changed the damaged component I started the car with MS box open. Touched the VBs - they were cold.
MS V2.2; 029l; LM1815 wheel decoder; dual VB921;
After driving the car for 2000 km without any problem I burned one more VB921 during cranking. Currently I'm using 029l code. When using 025 style wheel decoder the starting is hard.
I have two coils and two VB's respectively. However, only one of them died (Spark A). I have no reasonable explanation. After I changed the damaged component I started the car with MS box open. Touched the VBs - they were cold.
MS V2.2; 029l; LM1815 wheel decoder; dual VB921;
AE86 4AGTE REDTOP V3 Board; ms2extra_1.0.2-release
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