Topic: Digi Sync tool

[MRieck]

Anybody try this tool?? I remember digital sync tools were pretty expensive when they first hit the market. This is very reasonable IMO.
https://thedigisync.com

[Finnigan]

been seeing these ads everywhere, want to try one but don't want to spend that much on a product with glowing eyes

[Rayzerman]

I can't recommend this.... got one a few years ago, and it didn't work.  I explained to DigiSync guy what it was doing (not doing), to me it clearly was a defective unit...... he stopped communicating with me, never resolved it.  Still on the shelf, to me it's a brick.  I later picked up a Vacuumate, a very expensive tool that works perfectly.... it will bite your wallet hard.  You don't need anything that perfect......

I'd get either a Morgan Carbtune or set of vacuum gauges.  Be sure to calibrate (or at least know the deviation on each) the vacuum gauges.

[fizzlebottom]

I bought one and love it. I have a set of cheap vacuum dials too, and they work fine, but I'm a fan of seeing numbers and aiming for some idea of precision. I also had a little money to blow. I do feel like the DigiSync gets me closer to a good sync than the dials, but the biggest benefit is that is shows RPM values. That lets me setup the pilot screws properly because I can see 50rpm swings, whereas my tach is not really great about showing such small changes.

[willbird]

I bought four MAP sensors that are around here somewhere intending to make my own setup using something like an Arduino, pretty simple task that others have done quite a bit and shared their code on the net already.

[Deltarider]

[...] That lets me setup the pilot screws properly because I can see 50rpm swings, whereas my tach is not really great about showing such small changes.

Really. My 46 year old analogue tach shows me 20 RPM swings and in such a way, that I can detect them from the corner of my eye. However for syncing, the central idle knob is all what you need. Adjusting an individual air screw will not change the vacuum of that individual cylinder, that is: not to a degree you could possibly notice. Realise that setting air screws to achieve a highest rpm at idle is not a good practice with carbs that lack acceleration jets. Driveability, the acceleration in particular, will suffer.

[Kelly E]

We had a Digisync and sold it. None of us really liked the way the numbers are constantly changing to the point that it can be tough to read. Now we have a decent set of gauges and they are much easier to read quickly.
We tried it out on several bikes and just didn't take a liking to it.

[Deltarider]

[...] None of us really liked the way the numbers are constantly changing to the point that it can be tough to read. [...]

That's also my problem. When I measure things dynamically I tend to use my analogue instruments. A not too nervous dial will serv you better. Apart from the reading, which way the dial goes is intuitve. Digits your brain needs to interpret. For measuring resistances however I use a DMM.

[Medyo Bastos]

[...] None of us really liked the way the numbers are constantly changing to the point that it can be tough to read. [...]

That's also my problem. When I measure things dynamically I tend to use my analogue instruments. A not too nervous dial will serv you better. Apart from the reading, which way the dial goes is intuitve. Digits your brain needs to interpret. For measuring resistances however I use a DMM.

Yeah, I do the same. I like to see an analog gauge in certain instances like metering a dirty switch, but prefer a dmm for resistances as well!


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[fizzlebottom]

Really. My 46 year old analogue tach shows me 20 RPM swings and in such a way, that I can detect them from the corner of my eye. However for syncing, the central idle knob is all what you need. Adjusting an individual air screw will not change the vacuum of that individual cylinder, that is: not to a degree you could possibly notice. Realise that setting air screws to achieve a highest rpm at idle is not a good practice with carbs that lack acceleration jets. Driveability, the acceleration in particular, will suffer.

My 42 year old tach must not be in such pristine shape as yours, because it certainly does not display 20rpm changes with any bit of accuracy. I'm only following the procedure described in the FSM, which says explicitly to "attach a tachometer" and then make a series of screw adjustments which result in 50rpm increments. Again, my dash tach ain't really getting me all the way there. I like precision when I can get it, and I'm fine taking advantage of some modern innovations.

[MRieck]

This is one of the original units. Has anybody used one of these units?
https://www.partsgiant.com/p404201-tecmate-vacuummate-carburetor-synchronizer?m=15558495&gad_source=1&gclid=CjwKCAjwvvmzBhA2EiwAtHVrb506W8abpuRG7z18NrpFgj-j-0IhQppHcV1g8d5i2XIhrwYppoAbMxoCTCcQAvD_BwE

[Rayzerman]

This is one of the original units. Has anybody used one of these units?
https://www.partsgiant.com/p404201-tecmate-vacuummate-carburetor-synchronizer?m=15558495&gad_source=1&gclid=CjwKCAjwvvmzBhA2EiwAtHVrb506W8abpuRG7z18NrpFgj-j-0IhQppHcV1g8d5i2XIhrwYppoAbMxoCTCcQAvD_BwE

This is the exact unit I have (mentioned above), and does an excellent job.  Yes you can see rpm changes, and tune the vacuum readings quite precisely.  A bit spendy....... just like the DigiSync, it counts pulses to determine the rpm.
For those wanting a tach, perhaps get one of those timing lights with a tach display... you need a timing light, right?  I have one of those too.  That way you also get an electronic rpm.

[Tracksnblades1]

I bought one and love it. I have a set of cheap vacuum dials too, and they work fine, but I'm a fan of seeing numbers and aiming for some idea of precision. I also had a little money to blow. I do feel like the DigiSync gets me closer to a good sync than the dials, but the biggest benefit is that is shows RPM values. That lets me setup the pilot screws properly because I can see 50rpm swings, whereas my tach is not really great about showing such small changes.

I’m curious. Have you ever connected all four of your Digisync to a common vacuum source..?
For example a stock v8 engine’s vacuum source.. similar to Rayzer’s calibration and deviation concerns…

Just wondering whether all four indicate the same stable identical reading..?

I’m like the other old guys I like the analog so I can see the pulsations of each intake pulses and compare them to the  others..

A needle width change on an analog meter is still a needle width..

Remember trying to make that perfect shift back in digital speedometers and tachometers days..?