Power Commanders

[kiwifruit]

Do the suspension instead

[AllanB]

Do the suspension instead

Hmm nows thats a good idea afterall the engine is already making plenty of real road riding power.

[1vanvan1]

Basically a PCIII let you sort out a the air/fuel ratio by adding/subtracting fuel to the stock fuel map. As a result, you will most likely gain a few ponies, but more importantly, you make sure the engine isn't running lean, which most bike are from the factory (to meet emission standards etc).
Ask to see the air/fuel curve plotted from the dyno run. In general, a nice straight curve is good. Compare before/after fitting PC.

Don't be too fixated to the HP numbers. A good A/F tune first, then as a bonus, you'll see increased power output.

Also, when fitting after market exhausts, you're letting more air flow through the system, thus running the engine even more lean. The PC will once again let you add more fuel and make sure you're not running too lean.

You've confused me now .... So what you are saying is I can change the map?

[saul]

Get it do some research play around with maps great fun.

Do you need it ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

[Pussy]

You've confused me now .... So what you are saying is I can change the map?

Yes you can change the maps... a two minute job if you have a laptop

[johan]

You've confused me now .... So what you are saying is I can change the map?

Sure, you can change the map, you can have my Ducati map for your bike if you want, but it's not going to do you much good.
It's just numbers, add or subtract fuel at different revs and throttle positions, as other stated.
You tune (or create a new custom map) with a dyno by measuring the A/F ratio, among other things.

[Pussy]

Yes you can change the maps... a two minute job if you have a laptop

For instance: I still have a copy of the map for a K3-K4 GSX-R1000...Aussie spec, K&N filter, Yoshimura RS3 muffler, 95 octane fuel

AND K5 SV650S, Aussie spec, K&N filter, full yoshimura race baffle exhaust, 91 octane fuel

These maps can be installed in the respective power commanders in a couple of minutes with a USB cable

[johan]

Check this out:


The bottom graph is the A/F ratio, this one is running very rich. The ideal mixture is like the dotted red line. The PC let you tune this. But you need a dyno to really know what changes different maps do.

[breakaway]

So can you shift fuel maps from bike to bike (Same year / model of course) and it is still an optimal tune?

[The Stranger:Me]

Do the suspension instead

This man speaks the truth!

However, you don't get a lot of suspension mods for $150.00.

[The Stranger:Me]

So can you shift fuel maps from bike to bike (Same year / model of course) and it is still an optimal tune?

Yes you can shift maps from bike to bike.
But they are unlikely to be optimal - see post 11 for some reasons why not.
That is of course even ignoring arguments as to what constitutes optimal and how you arive at it.

[davereid]

Fuel injection is not that complicated, except its hellishly complicated.

Here is how it works.

For any given amount of petrol, you need a precise amount of air (oxygen) to burn it.

If you have too much petrol, some of it won't burn as there is no oxygen.

You wasted space in your cylinder, filling it up with petrol that you could not burn and you had to waste (out the exhaust).

Same happens in reverse.

If you have too much air, you have wasted energy by filling your engine with air, that won't explode, making power.

Your engine makes the most power when the match is perfect.

But, the explosive mixture takes a finite time to burn.

And that time changes with rpm, compression, fuel quality (octane), air pressure, valve timing and engine design.

So, while it is possible to calculate, guess or copy the ideal mixture for your engine, you get better results by test-and-measurement.

Thats what mapping is. Just telling the computer how much fuel and air gives the best result for each setting of rpm and throttle.

And when to "light the fire" if your fuel injection system also controls spark.

[bikerboy011]

Am saving up for one cost 600$ new, 150 thats cheap as.

[johan]

Fuel injection is not that complicated, except its hellishly complicated.

Here is how it works...
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..
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That's a pretty good explanation!

[breakaway]

So why does it take authorised and 'experienced' guys to tune it? If all it is is just changing some figures at a laptop, shouldn't anyone with half a clue be able to sort it?