Explain "dyno tuning"

[kroberts]

I've read the term "dyno tuning" several times. I'm still just a noob. I get the idea that you bring your car to a shop with a dyno. They strap in down and make a baseline pull. So the dyno charts hp and torque and keeps track of oxygen quantity in the exhaust gas to determine combustion efficiency? Is that right so far?

If the technician/tuner guy decides there are problems what do they adjust? Isn't everything pretty much controlled by the DME/chip? I'm sure the dyno would quickly reveal some big problems like incorrectly sized injectors but can stuff like injector pulse duration or timing advance rate be adjusted on-the-spot? Is that even altered at all?

This strikes me as the sort of task which requires a specialist to achieve best results. That is, a guy who just tunes BMWs or Subarus or Mustangs. I'm sure there are generic recommendations that could be made though. I'm still a long way from getting mine running, I'm just trying to build my knowledge base.

Thanks for your continued patience. As always, comments are appreciated.

kroberts

[NC325iC]

with dyno tuning you would usually have a standalone fuel management or a piggyback system or they would burn you a new chip or something to make changes in how its running

[kroberts]

So the term doesn't really apply to cars running the stock DME. In that case you buy a chip for your engine/mods and run with it.

Thanks,

kr

[matt]

Sure, you can dyno tune a stock ECU. You just need a bit of specialized equipment and know how.

You basically have the idea. There is a book called "Engine Management: Advanced Tuning" by Greg Banish that I highly recommend.