Triumphrat

jimmyj900 · 06-12-2005

Everybody remember the thread about Nology coils screwing up tachos?

Well, they'll also cause problems with dyno runs by inducing noise into the system through the dyno's ignition pickup.

It really makes a mess of the high-rpm curves...

Adding a pair of diodes to the #1 coil (where the dyno ignition pickup connects) cures it.

Jim

trypcil · 06-12-2005

Apart from being OEM replacements, do the Nology coils offer any returns (once the diodes are in place) over the stock coils, ie :- performance, long term reliability, expense, fitting and ease of acquisition. So you've dyno'd your bike, any graphs of before and after for comparison, perhaps? The stock HT wires have that cap affair the prevents water from 'getting where it ought not', what means of incorporating the existing leads do you recommend, if at all? If the returns are markedly beneficial, any chance of a creating comprehensive procedure description, that we could access via maybe the download section - cheers.

jimmyj900 · 06-13-2005

Quote:

Apart from being OEM replacements, do the Nology coils offer any returns (once the diodes are in place) over the stock coils, ie :- performance, long term reliability, expense, fitting and ease of acquisition. So you've dyno'd your bike, any graphs of before and after for comparison, perhaps?

The Nology coils don't seem to present any performance improvements - unless you've got a bad Gill coil or two. Dyno runs before and after would have been meaningless since I was replacing a failed coil that had previously been only "weak."

The Gills aren't as reliable as they could be so improving reliability really IS a performance improvement.

They were less expensive than stock when I purchased them including the sales tax and shipping tradeoffs, so that was a plus.

UPS ground shipping for the Nology coils was a day or two faster than my dealer's delivery time, so availability was a non-issue.

Quote:

The stock HT wires have that cap affair the prevents water from 'getting where it ought not', what means of incorporating the existing leads do you recommend, if at all? If the returns are markedly beneficial, any chance of a creating comprehensive procedure description, that we could access via maybe the download section

I stayed with the Triumph leads partly for the water protection you mention, but also because the Triumph leads are copper-cored and my experience is that copper wires are more reliable than resistor-cored wires.

Nology also requires copper-core plugs with their resistor wires and I really couldn't see much sense in switching to special-order spark plugs.

So... altogether it made more sense to change the connectors on one end of the Triumph wires than to replace the entire system with Nology parts. Considerably less costly too...

So far the only drawback has been the noise output of the Nology coils. Take a look in my photos -- I've put up a couple of pics of the Nology and stock/diode added waveforms. They're crappy pics, but you'll see the difference.

As far as directions, well... Real men don't need directions... :-D

Jim

Slinky · 06-13-2005

I am completely clueless when it comes to electronics- Would it have made any difference to the noise output if you had used the Nologyresistor wire?

And, do Nology know of the problems their coils create? As it is just a question of fitting a couple of diodes you would think they would fit them at time of manufacture.

jimmyj900 · 06-13-2005

Quote:

I am completely clueless when it comes to electronics- Would it have made any difference to the noise output if you had used the Nologyresistor wire?

And, do Nology know of the problems their coils create? As it is just a question of fitting a couple of diodes you would think they would fit them at time of manufacture.

The noise is on the primary (low voltage) side of the coil and is actually oscillation that ocurrs when the coil fires.

The resistance of the Nology coils is about the same as the resistance of a stock spark plug so I don't think there's a real difference there.

Adding the diodes keeps the noise from bouncing into the igniter and being carried to the tacho and that was the initial concern with the previous "Tacho" thread.

From comments in the previous thread Nology is aware that their coils will cause problems with some Triumph tachos and should now be aware that a couple of diodes will cure it. Whether they will have the design altered by their manufacturer is another issue....

Jim

Tommybro · 06-14-2005

I was thinking of that old Tacho/Nologly thread the other day while riding down the road looking at my dead tach. Anyone have any good clear photos of the diode install? I can't read directions, I can lookat pictures though. !!??