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Originally Posted by ananthkamath When I said small I was referring to drilling holes in the airbox. I've been there, done that, and therefore don't recommend it to anybody specially if they're looking for performance. |
Oh! Sorry for the misunderstanding on my part then
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Originally Posted by ananthkamath Also, what did you mean by static and dynamic? The stock RX's timing advance changes as per RPM. The bike wouldn't run otherwise. |
Static = Fixed. Dynamic = moving or changing.
An analogue CDI will give static timing. At least all the common units here like RX135 etc. So it works like the points ignition on the RD. Example -> if you set the timing at 2mm BTDC. It remains at 2MM BTDC.
Where as with digital CDIs, tHe timing is not static. It changes based on RPM, normally referred to as the timing curve, where for a given RPM the timing is known.
What they do with Digital CDI is that, when RPM's are low and Scavenging is at its worst, timing is ramped up to extract every ounce of power. Thus boosting the power the most under peak Torque RPM.
Then, at around peak when power is on par with stock except for the increase from better burn, timing is backed off which pushes heat into the pipe, allows the engine to run cooler AND a slight increase in the power by allowing increased revs. (Ah well, maybe not MORE power, but more USABLE power. he he
).
For anyone wanting to upgrade ignitions, check following three points:-
1.
Spark / Energy strength:- Research the market out there and see which is the best one for this. The info is all out there on the internet.
2.
Spark timing / The Ignition map you land up using:- Carefully check this point as this is the loophole exploited by all the Con-artists out there. Carefully check it's NOT some Four Stroke Bike CDI that is being sold to you as a Digital CDI upgrade. Sure, the timing maybe Digitally/Dynamically controlled, BUT you are using a 4 stroke timing curve on a two stroke. Example:- Bangalore/Bombay guys will know how they used to cheat RD guys by offering something like a Scooty Pep "Digital" CDI.
3.
The accuracy maintained between each time the spark fires:- Very critical and has the largest bearing on the smoothness of the engine. With the company CDIs, most running slow processors, (Example:- at 4 Mhz) The timing is never going to be accurate. Between each RPM, timing is going to be jumping around by a few degrees. Simple cause - Anything from the company has only one criteria. L1 or cheapest quote.
Find an upgrade that has a good, high speed processor which will hold timing accurately between each RPM.
I think I have gone way too much offtopic. Sorry guys.
As regards the topic of this thread, UNI is what gets my vote. With proper upjetting, ofcourse.