So, just who should I believe?

[mave2911]

Simple one ladies and gentlemen.

If I set my idle by my tachometer, it reads about 800rpm less than my PowerCommander3 plugged into my 'puter.

So, who is right?

Cheers,
Rick

 

[FloppyRunner]

Ooooo, that's a good one... 800 RPM is a significant difference.... Does it read 800 RPM difference no matter how far you twist the throttle, or does the difference increase or decrease as you change throttle position?

 

[Motogiro]

Simple one ladies and gentlemen.

If I set my idle by my tachometer, it reads about 800rpm less than my PowerCommander3 plugged into my 'puter.

So, who is right?

Cheers,
Rick

Your tachometer is the reading you go by. The tachometer gets it's signal from the crank position sensor. So it sound's like when your power commander is plugged in your fueling is different than when the power commander is not plugged in. There's an idle set screw, left side, below the tank. When your PC is plugged in, adjust the idle to specifications. 1250-1300 RPM?

I would also get the PC tuned by a pro tuner.

 

[yamihoe]

go by the tach...its what you see when you are riding. when you are shifting you aint lookin at the computer....:BLAA:

just curious---can you change rev limiter with the PCIII?

 

[REO Scorpio]

When hooking the PCV into the computer, the dynojet software reads around 1300 +- 20. On the tach, looking while planted on the seat, reads about 1100 (as the angle you're looking matters.)

As posted somewhere else, I also use this program to check http://www.tunelab-world.com/rpmsound.html and its about the same as the PCV software.

I have just left tach at 1100 as 2/3 say it's good. 800 is a pretty large discrepancy though...

Scorp

Wish I could give credit to whomever first posted about RPMSound. Nifty little free program.



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[FinalImpact]

You might ask around with the Auto buddies and maybe someone has an inductive pick up tach that clamps on or when near the coil wire picks up the energy. We have our DEQ (Department of Environmental Quality) folk who inspect our vehicles. Maybe you could ride through there and get it tested?? But 800 RPM, thats huge. You can tell that by listing to it.

Anyone try that sound app? Looks pretty cool! Also I have a photo tachometer but you need something spinning exposed. Could used the rear tire but not the safest plan. . .

 

[Humperdinkel]

Your tachometer is the reading you go by. The tachometer gets it's signal from the crank position sensor. So it sound's like when your power commander is plugged in your fueling is different than when the power commander is not plugged in. There's an idle set screw, left side, below the tank. When your PC is plugged in, adjust the idle to specifications. 1250-1300 RPM?

I would also get the PC tuned by a pro tuner.

Go with Cliff , he is the man & has never led anybody astray :thumbup:......... There is an old lady on the forum that shares a remarkable resemblance to him though , I wouldnt trust her for a second :BLAA:

 

[mave2911]

Just to be clear, the idle, according to the tach, doesn't change whether the PC is plugged in - it is just reported differently by the PC when connected to my 'puter. (for readout)

According to some, I have seen, dynos report the idle differently to the tach too.

Cheers,
Rick

 

[DefyInertia]

I don't have a technical response for you, but from listening to the engine speed you can probably pretty well judget when it's around 1,300 (giver or take 300 rpm?). So if the two are 800 off you should be able to get a pretty good sense of which is accurate (assuming one is actually corrent as opposed to both being off by 400, for example).

Stating the obvious but that's all I have to add. GL.

 

[REO Scorpio]

Just to be clear, the idle, according to the tach, doesn't change whether the PC is plugged in - it is just reported differently by the PC when connected to my 'puter. (for readout)

According to some, I have seen, dynos report the idle differently to the tach too.

Cheers,
Rick

+1. Edited my post to make more sense as well.




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