ignition timing

[Speedzalot]

Maybe that slower ET had more to do with the guy that tuned it.


Arguing with idiots is like wrestling a pig in the mud, you both get dirty but the pig enjoys it!<i></i>

[spamanglenn]

Black art bullshit eh?If someone has measured timing advance and injector duty of a stocky in each gear then one with a tre or gps mod all the guessing would be laid to rest.Some say ignition change,some say fuel change,some say both. Glenn the Spa Man<i></i>

[RuffRed]

Glen - Take out the hook mate

Besides the time Col had mine on the dyno for the mapping, it's never been tested - and to be honest i'm not overly concerned - If i was a drag regular then probably but I prefer corners - If i had of said 189hp you wouldn't have believed me now would you

I enjoy coming out and supporting the guys and gals who do it, but it's really not something that I am keen on doing.

Ruffy

<i>Edited by: RuffRed at: 5/11/06 20:33
</i>

[Speedzalot]

If you really want to know ask Faster or give Cole a ring I am sure they have a good idea whats going on.


Arguing with idiots is like wrestling a pig in the mud, you both get dirty but the pig enjoys it!<i></i>

[spamanglenn]

I appreciate everyone has their secrets to protect their point of difference, i just want to nut out the answer. <i></i>

[Tech Doctor]

I asume you are talking about Colin from 10 tenths? <i></i>

[Speedzalot]

Quote:I asume you are talking about Colin from 10 tenths?

Yep


Arguing with idiots is like wrestling a pig in the mud, you both get dirty but the pig enjoys it!<i></i>

[fasterfaster1]

Quote:Some say ignition change,some say fuel change

Changing the first changes the latter So if the first is changed and optimum fuel settings are not reset as required then it could actually result in a power loss
FF1 <i></i>

[spamanglenn]

So thats why you,ve mentioned before if you fit a tre to map the fuel settings to suit.different advance giving a different air/fuel ratio for the same amount of fuel I assume.Perhaps this is why bikes with tre fitted have shown a loss in power and slower et,s,they weren,t fuel optimised.See faster, i do listen.As i have a pc3 usb it makes sense that if i fit a tre or similar to give one ignition curve for all gears it is fuel mapped to suit or potentially leaner mixtures at greater ignition advance could occur.Am I getting warmer?? <i></i>

[Gnarbunkle]

The technical description on FI in the service manual has a bit of a description on how it works. My understanding is that each cylinder has 2 fuelling maps, one used at light throttle openings and injector duty is determined by rpm and the inlet air pressure sensor. At high throttle settings, the other map is chosen and this time injector duty is controlled by rpm and the throttle position sensor. Final injector duty is based on the above plus a "correction factor" from "various inputs". Various inputs are atmospheric pressure, coolant temp, gear position etc. This is all well and good for for a completely stock bike, but when you fit an aftermarket exhaust, gut the airbox, change cams, velocity stacks, gearing etc then those stock fuelling maps are off the mark. A modded GPS does not change the fuelling maps, its' effect is to change the output from the various "correction factors" by giving a false gear position signal. A PC is a mid priced "go-between" box to restore correct fuelling and will do so if set up on a dyno. An aftermarket ECM is a more expensive option and gets rid of the "go-between" the fuelling maps need to be generated on a dyno. I have the poor mans option: factory ECM and no PC, the GPS has been modded and the A/F set to 12.7 across the band. Yep its' cheap, its dirty and seat of the pants feeling is that it works for me. <i></i>