Tag Archives: YZF-R125 fuel mapping

Interview with dynojet – in detail on power commanders


So as you may have seen the last few videos have been focussing on fuel mapping with the Power Commander.

Till now the videos have been focussed on the Power Commander V (PCV) since it’s the one I have, but it seems like the Power Commander FC (PCFC) and Power Commander 3 USB (PC3USB) are more widespread, perhaps due to their lower cost.

In the last video we went through the process of how I build a map for my bike using the PCV + the attached autotune box which links to a wideband O2 sensor to adjust the fuel map on the fly.

But as far as I could tell there was no way of doing that with the PCFC or PC3USB. They don’t have the onboard CAN bus (a messaging protocol which car devices use to talk to each other) so there’s no way to link them to a wideband, and if that’s not how you tune.. how *are* you meant to tune them?

Lots of people talk about “chuck a power commander on it and get a bit more power” (aka “Common Knowledge”) but I never found anyone willing to go into more detail on how to go about doing that in a slightly more scientific way, or why you should have one box over another. Or at least I couldn’t find anyone *who knew what they were talking about* who would do so.

Mechanics are often better at doing than explaining which doesn’t help feed this “pool of common knowledge”, and they arguably also have a financial incentive to not tell you how to DIY since that potentially deprives them of future business. That’s just capitalism though, and also not necessarily how my brain works, so here we are.

Continue reading Interview with dynojet – in detail on power commanders

Making a new fuel map for bigger injector with PCV & Autotune, on yamaha YZFR125

This video follows on from my last one and goes through the process of building a new fuel map from scratch for my 180cc YZF-R125, the way I do it, using the Dynojet Power Commander V (PCV) and Autotune (with a wideband 02 sensor).

We go through all the various components/electronic gizmos and how they interact to get to the end result of a tuned bike.

I hope this makes sense cos I had to make a bunch of diagrams and stuff for it which took forever lol xD

This video is focussed on tuning using a PCV and Autotune which is a setup that seems to be working well for me, and for this sort of moderate tuning.

I know many of you have PCFC/PC3USB etc which is a little different and can’t use autotune, and the next video will be about what your options are in that case. Thanks for your patience and I hope it’s helpful 🙂


Please check out this interview I did with DynoJet UK – we covered some really interesting ground – especially if you’re thinking of buying a Power Commander (who make the Power Commanders).