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Author Topic: Performance testing with VEMS  (Read 8047 times)

Offline dnb

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Performance testing with VEMS
« on: June 28, 2007, 11:31:12 am »
I need to do some performance testing on a couple of cars.  One is my TVR, and the other is a friend's TVR.  Mine has VEMS already and his doesn't yet.  We planned to fit a trigger wheel to his car so my spare VEMS could do data logging, but his wife is beginning to add up the cost of TVR ownership...

Is there a nice and cheap way to get a trigger input to VEMS using something like an inductive sensor on an HT lead?

All I need to do is monitor RPM with a reasonable degree of accuracy.  The rest is maths.
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Offline cliffb75

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Re: Performance testing with VEMS
« Reply #1 on: June 29, 2007, 08:45:09 pm »
Can't you just splice off the tacho drive signal?
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Offline dnb

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Re: Performance testing with VEMS
« Reply #2 on: June 30, 2007, 10:59:03 pm »
The tacho drive signal on a TVR is nasty - it's an inline resistor from the coil and I'm a bit nervous about using it!
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Offline Bat

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Re: Performance testing with VEMS
« Reply #3 on: July 01, 2007, 11:15:45 am »
Hi,
I see your point, but Rover used it to trigger their ECU .....
Don't know if that's a good or bad thing, but it certainly worked.
Cheers,
Gavin :)
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Offline rob@vems.co.uk

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Re: Performance testing with VEMS
« Reply #4 on: July 02, 2007, 01:15:25 pm »
What about a bit of Zener diode protection?
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