| Author | Message | ||
     Ingemar  |
Question. What difference in power does advancing the ignition make? Specifically, the ignition curve in the race ecm? Does ignition by itself give a (noticable or measurable) performance increase? If using the stock ecm with the techlusion, could advancing the static timing compensate for that loss? Thanks! Ingemar. | ||
| Signguyxb12  |
COURT, COURT!!!!! he must be sleeping | ||
| Blake  |
Ingemar, The cam timing sensor of the XBs needs to be per factory spec or bad things happen. That timing also controls the EFI. You do NOT want to mess with it other than to verify its correct and accurate setting.  | ||
| M1combat  |
I've heard that the XB's are about as advanced as you want from the factory. That is... If it's adjusted properly from the factory. | ||
| Ingemar |
Is it nonsense then that the race ecm has a different ignition curve than the stock ecm? | ||
| M1combat |
It may have a different curve, but it would time the EFI the same most likely. You still wouldn't want to advance the static timing any more than the factory does from what I hear. Static timing and actual timing are different. | ||
| Blake |
Ingemar, I don't know what if anything is different about the race ECM timing-wise. I know that the race ECM EFI parameters are different in that it runs richer. All I am saying is that you cannot simply adjust your cam postion sensor timing to affect ignition timing because it also affects the EFI and will bugger it up and make your bike run like crap. | ||
| M1combat |
The XB is sequentially injected. Each pulse is timed with the intake cam. This helps with power a little, and it helps with emissions and economy. Proper timing is what you need... If you were to check the timing and set it by the book, that's probably about as good as it gets. | ||
| Trenchtractor  |
Ingemar, I'm not sure what you know about timing and advance, so if I'm teaching you to suck eggs, sorry. Problem is; if you don't understand the basics, you can't understand why what you're suggesting is bad. There are more than one type of timing... Ignition, Valve and Injector. They are all interelated, so if each one isn't correct you won't achieve optimal performance. Lets have a think about your engine. The valve timing is set up mechanically inside the engine (pushrod style for the XB) but your engine uses the cam position sensor as a trigger for the firing of the ignition and injectors. However, the ignition and injector timing is made based on the cam position pulse and a time calculation. It's a dificult thing to get someone else to imagine, but here's the important statement... As engine speed increases, the time the piston takes to move from where the cam position sensor pulses to the point where the injectors and ignition need to fire (respectively) decreases. Therefore, the timing needs to advance. If your engine always ran at the same speed, you wouldn't need an advance curve. Since the vavle timing is mechanical, it's relationship to RPM is set and no outside 'advance' is required. But for the ignition and injectors, they need to fire closer and closer to the cam position sensor pulse as the revs increase to ensure the fuel and spark are arriving at the right time for the combustion to take place at just the right time. So you should now see that timing and advance are diffenent things. Timing being correct at idle and advance being the compensation the ECM makes for increased engine speed. I feel strongly against using the static timing setting to effect advance adjustment. Also, while more advance can yeild greater performance, you may need to use higher quality fuel to prevent predetonation (pinging) and see any improvement. | ||
| Ingemar |
Thanks for the explanation Brad. I'm not too smart on timing and ignition. I'm glad I didn't mess with it before I asked  . |
