Diesel Pulse Adapter Info Thread

[745 turbogreasel]

The limiting factor of the max rpm for the pulse adapter can not be the lines! If it were, a Tiny Tach would be useless as it would only measure to 1500 RPM. The most likely limiting factor is the timing light itself, which must have time to produce the high voltage the tube needs.

Snap on says the light is  within 1 degree from 30 to 9900 RPM  I doubt any of us can push even  the cheapest of timing lights in terms of RPM.

[ORCoaster]

Jimfoo,  My Tiny Tach reads from 600 to over 3500 since I have had it.  Depending on idle and shift point.  I am not sure I follow the 1500 RPM limitation.   

There are several factors to any reading I made.  Lots of interactions between Adapter type, clamp position, Timing light type and the electronics of either adapter.  Remember we are taking a signal off with a sensor driving it into a device that amplifies it to a point that a regular inductive timing light can then be switched on or off.

I did get a Snap on light to use that way I tried to minimize the possibility that the adapters signal and timing light pickup would be a variable.

[vanbcguy]

Hey folks, cleaned out a bunch of the pointless bickering that was still lingering in this otherwise extremely useful thread and made it a sticky, enjoy!!

Oh and for what it's worth, my M-TDI is currently timed to about 1.43mm which is 12 degrees with my light - appears to be quite happy there...

[ORCoaster]

Good for you and us.  If my equipment wasn't so hard to find, I would be up for sending it around the country for all to use but IF it was lost in transit or in someones tool box I would never feel good about that.  Hard to have this stuff and not be able to share without being the one to do the work. 

Yeah, we could insure it for a billion dollars but the fact is they don't make them anymore and replacements on Craigslist, or EBay are just not there.  The downer to owning a 30+ year old car with no electronics.  The Plus side, no ECU to replace for 500 bucks minimum. 

[libbydiesel]

Schematic for my Snap-On pulse adapter.  It should work fine with the tinytach piezo sender.  Component list is included in my next post.  Bear in mind that there is one zenner diode (D1) that does not have any definitive markings.  I do not have the means to test it, and will not be removing it to do so.   For that diode, trial/error or further research would be required.  The components aside from the sender would cost approx $20 at Mouser/Digikey.

[vanbcguy]

Good work Andrew!!

[libbydiesel]

[monomer]

Schematic for my Snap-On pulse adapter.  It should work fine with the tinytach piezo sender.  Component list is included in my next post.  Bear in mind that there is one zenner diode (D1) that does not have any definitive markings.  I do not have the means to test it, and will not be removing it to do so.   For that diode, trial/error or further research would be required.  The components aside from the sender would cost approx $20 at Mouser/Digikey.

Parts list image is broken

I've been looking for an electronics project for a bit, just got a new iron and (old) scope to play with. I haven't etched a board in a decade or so. that should be fun.

any way to make this drive a tach?

[libbydiesel]

It was uploaded to this site as an attachment.  Apparently that option was removed.  PM your e-mail to me and I'll forward a copy to you. 

[shortysclimbin]

Is there anyone around the Richmond, VA area with a pulse adapter on here? I was scratching my head last night for a few hours and am still fighting my cummins pump swapped ahu.. This would be very handy to eliminate yet one more minor swap setback.