My local championship has only one reg for kz. CC must not exceed 125cc.
My engine is pretty well developed, however the ignition could be changed from the standard TM supplied unit.
My tuner talked about a digital ignition. Has anyone experence with other forms of ignitions?
Very cool. For general knowledge… what’s the advantage of having bespoke timing like this in an open ruleset?
You can program the ignition to fire at the optimum point depending on the revs at a given point rather than it being set to one single degree across the board. There’s other bits a bobs you can play about with as well. That’s the very very very simple version. Obviously it’s way more complex, but it’s about having a degree of freedom with timing.
The other option is to use a variable ignition timing setup from PVL. Visually almost identical, makes quite a bit of difference and bolts right up.
I think it was the varible ignition system he was speaking about.
Have you experienced much of an improvement in laptimes or does it improve driveability instead?
I haven’t tried it (it’s not legal for KZ) but I was told it makes a a significant difference laptime-wise as it’s one of the major limitations of a KZ. You gain bottom end while extending top end rev range, as you break away from the compromise of a static ignition point.
You can get a retrofit kit
or the whole ignition system
How is the PVL variable ignition programmed? Or does it just have a static advance curve?
I believe it’s non-programmable, based on a pre-determined curve that apparently works very well with the TM engines. You just need to bolt it on and index it correctly. I know of the option as some used it to cheat in local races (and got caught) as you can disguise it to look almost exactly like the regular one. The one @Alan_Dove shared looks much more sophisticated and adjustable
I bought one and sent it to Swedetech to have it installed/dynoed/get the timing set correctly.
The results were… .5 hp gain from 10-11.8k rpms. Then .8hp from 11.8-13k. However, it ran hotter by 50 degrees, so it needs a larger jet to sustain this. After jetting it up, the power gains were negligible.
Basically, don’t waste your money trying this if you’re in an open class.
I know this is an old post, just wanted to update it with some data.
To second this, the results were’nt noticable. Maybe a more advanced ignition would be better that you can programme.
Mine didnt run any different temperature wise. It does require to be ran richer though. I had a lean seize in testing.
Infact I had better laptimes on the old ignition