mataylor
New Member
Has anybody come up with a solution to getting the rpm readout to work when using lasar ignition? The lasar does not generate enough voltage for my Dynon to read out. I will accept any suggestions
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
RPM readout with Lasar ignition
- Thread starter mataylor
- Start date
PhantomPholly
New Member
- Joined
- Jul 27, 2007
- Messages
- 582
Couple of simple options.
First is the signal wire to the coil - what voltage is it? It might be possible to use a diode &/or resistor and tap a pickup from that source.
There are induction pickups you can place over one of the spark wires - the sort that cause an automobile-style timing light to flash. Don't know what voltage they result in, but it might be adjustable with resistors.
There are optical pickups for magnetos - don't know if there is a place to put one in a Lasar.
And then there is the old mechanical takeoff. I'm pretty sure there are products out there which will generate a 10v+ signal off of these, and the advantage here is that it doesn't matter if you turn off one of your ignition sources.
First is the signal wire to the coil - what voltage is it? It might be possible to use a diode &/or resistor and tap a pickup from that source.
There are induction pickups you can place over one of the spark wires - the sort that cause an automobile-style timing light to flash. Don't know what voltage they result in, but it might be adjustable with resistors.
There are optical pickups for magnetos - don't know if there is a place to put one in a Lasar.
And then there is the old mechanical takeoff. I'm pretty sure there are products out there which will generate a 10v+ signal off of these, and the advantage here is that it doesn't matter if you turn off one of your ignition sources.
- Joined
- Mar 23, 2005
- Messages
- 13,226
First, we have had a report that the Lasar worked with no converter, even though the specs say it shouldn't. There's no harm in hooking it up and trying.
The best solution here is probably to run a tach transducer that plugs into the accessory port. Vans sells them as VTACHGEN. This will give you a 12V pulse no matter what your ignition system is.
The Lasar systems are tricky ones. They put out a lot less voltage than any other system we know of. It's hard to support a 7V pulse while you also support a 600V p-lead pulse. We have discussed making a converter, but we only get asked about this about once a year, and it really doesn't make sense for us to spend the engineering time and money on the converter for the volume of them we would sell, especially given there are other solutions.
As an FYI, this is not unique to the Dynon equipment. The GRT engine monitors have the same issue.
The best solution here is probably to run a tach transducer that plugs into the accessory port. Vans sells them as VTACHGEN. This will give you a 12V pulse no matter what your ignition system is.
The Lasar systems are tricky ones. They put out a lot less voltage than any other system we know of. It's hard to support a 7V pulse while you also support a 600V p-lead pulse. We have discussed making a converter, but we only get asked about this about once a year, and it really doesn't make sense for us to spend the engineering time and money on the converter for the volume of them we would sell, especially given there are other solutions.
As an FYI, this is not unique to the Dynon equipment. The GRT engine monitors have the same issue.