Safe Ignition Advance
Safe Ignition Advance
(OP)
Hi,
I have a new Engine Control Unit for my Moto Guzzi that allows me to alter the spark setting and injector timing at any rev range.
I gather there's a point at which advancing the spark results in little increase in power but higher risk of engine dammage due to higher piston load at TDC
My question is what is the maximum safe advance to use?
Is there a simple formula to calculate advance vs engine speed.
I guess the same goes for injector timing I immagine there's a formula for that also.
I am not seeking super performance just a nice smooth ride with reasonable fuel economy and reliability.
Thanks in advance
Roy
I have a new Engine Control Unit for my Moto Guzzi that allows me to alter the spark setting and injector timing at any rev range.
I gather there's a point at which advancing the spark results in little increase in power but higher risk of engine dammage due to higher piston load at TDC
My question is what is the maximum safe advance to use?
Is there a simple formula to calculate advance vs engine speed.
I guess the same goes for injector timing I immagine there's a formula for that also.
I am not seeking super performance just a nice smooth ride with reasonable fuel economy and reliability.
Thanks in advance
Roy
RE: Safe Ignition Advance
I assume when you say injector timing, you mean duration. There is not a lot to be gained by changing the timing of the injection but the duration controls the quantity of fuel injected which directly controls the air fuel ratio.
RE: Safe Ignition Advance
Thanks for the response.
Roy
RE: Safe Ignition Advance
Start with the factory timing curve.
Does the system accept some kind of throttle position or intake vacuum input signal?
RE: Safe Ignition Advance
Take it out. Ride it long enough to get a "base line". Now, TINKER with it. If you go too far, your gonna be the first to know it...Those two big cylinders hanging out the side will let you know, for sure. So long as you do not over do your changes, so long as you do not press the issue, so long as you use a little common sense...you may be able to improve your ride beyond any percieved "factory compromised performance".
Remember the "truism"...Free advice is often only worth it's cost!!!
Rod
RE: Safe Ignition Advance
The stock ECU on the bike had a few issues, cutting out etc.
For about 1/2 the cost of a new Black Box I purchased a kitset that allows me to freely set the advance and injector duration.
Yes, it has throttle position, atmospheric pressure, oil & air temperature along with provision for a lambda sensor for closed loop operation.
The bike naturaly goes like a rocket so I am not seeking any more power I would rather go for reliability and better fuel economy.
Regards
Roy
RE: Safe Ignition Advance
An extra 10-15 degrees of "vacuum advance" might be correct for part throttle economy
RE: Safe Ignition Advance