Leave it to Jamie...Thanks

 

So based on the info posted here can we assume that a tuner such as the PCV is used primarily for the closed loop AFR and lower RPMS and that the stock ECM does it's job at higher RPM's?

Thanks for posting mtclassic and thanks to Jamie for the input

 

since a vehicle with a catalytic converter can run a richer fuel mixture than a similarly equipped vehicle without a cat and still achieve lower emissions, do the newer bikes (2010 and up) run a slightly richer base map?

 

Thats a great question.... but I doubt it.

 

yeah, me too, but thought i would ask anyway....

 

The way I understand what Jamie said is basically the stock ecm is ok if everything else is stock but when you start changing the pipes, ac, or cams then you need to program for that.

 

the dyno chart with afr graph was comparing stock with fuelmoto's header and it looked pretty rich still.

this is a factory stage 1 download which kind of matches the wot numbers jaimie posted and the cruise numbers are not too far off.

 

I'd like to see the AFR with slip-ons and a filter.

This really makes the XiED's sound like a deal. They really only work in closed loop and the ECM takes over adequately in open loop/near and WOT.

 

They won't be significantly richer. Cats work best when you switch the a/f ratio around stoich, that's why they need closed loop a/f controllers to function correctly at part throttle. On an emissions trace there is relatively little time at WOT, so you can calibrate it to run where it needs to be for a/f without much of a penalty.

Some vehicles have timers that keep you in closed loop at WOT for a short period of time, our bikes don't have that functionality though.

 

What year stage 1 download is that?