PCIIIR vs PCIIIUSB

sheepofblue · 08-13-2005, 2:37 PM

I have a PCIIIR but am considering a switch down the road to a USB. My only thinking is the fuel pump feature and the 'possibility' of storing and loading maps via my onboard data acquisition equipment. Of course the second depends on me installing it and which OS (leaning toward Linux so that would likely prevent it)

Haywood · 08-13-2005, 7:26 PM

Fuel pump feature?

sheepofblue · 08-13-2005, 7:56 PM

Quote:

Originally Posted by Haywood

Fuel pump feature?

accelerator pump sorry.

Haywood · 08-14-2005, 11:32 AM

Quote:

Originally Posted by sheepofblue

accelerator pump sorry.

I'm still lost? What does the PCIII have to do with the pump?

sheepofblue · 08-14-2005, 12:18 PM

What does the accelerator pump do

Note this is a PCIII USB only feature

Haywood · 08-14-2005, 12:41 PM

I see said the blind carpenter as he picked up his hammer and saw.

I didn't know that was available on the USB. Neat...

Jungleboy · 08-14-2005, 6:33 PM

For What its worth the USB version is also mapped in 250rpm increments as oppossed to 500rpm on the Serial PCIII's

sheepofblue · 08-14-2005, 6:45 PM

Quote:

Originally Posted by Jungleboy

For What its worth the USB version is also mapped in 250rpm increments as oppossed to 500rpm on the Serial PCIII's

True does anyone know if this has practical advantage?

The Sook · 08-15-2005, 2:32 AM

It'd have to be more accurate wouldn't it? smaller margin for error.
You can map each cyclinder individually also, and the ignition adjustment does Jack, so if you have the money, it's probably worth doing, and you could sell your IIIr anyway.

sheepofblue · 08-15-2005, 10:00 AM

Quote:

Originally Posted by The Sook

It'd have to be more accurate wouldn't it? smaller margin for error.
You can map each cyclinder individually also, and the ignition adjustment does Jack, so if you have the money, it's probably worth doing, and you could sell your IIIr anyway.

Sometimes resolution can exceed need, thus my question on gain of 250 vs 500. I assume that the PCIII takes the entered points and creates a curve rather than a step function to determine mapping (if it is a step function the higher sample rate would likely be important). And for those that have RCs the mapping is per injector

So you can have two maps per cylinder

Maser · 08-15-2005, 2:24 PM

The pump accelerator is a great feature. The bike feels faster when going from almost closed gas to fully open quickly. I have turned it off a few times and I can tell the difference immidiatelly.

The Sook · 08-15-2005, 11:28 PM

"Sometimes resolution can exceed need, thus my question on gain of 250 vs 500"

I agree, BUT, when you say, steadystate map a bike with a PCIII (2-5% throttle) you sometimes see where once an rpm is done, and it starts to let go (brake) for the next rpm, the air'fuel changes heaps between that 500rpm and the next. SO, I'm pretty sure the 250rpm would be more accurate. there's diagrams etc of how pc's work, and I can't put them here (coz I'm a dumb arse that way. lol............ yeah come on, "that way?" haha) But anyway, with that, the pump feature, the individual cylinders etc etc, I'd say it's worth it.

DUX · 08-15-2005, 11:32 PM

Will the PCIII make a big difference with just a slip-on?

My local shop (race shop, not a dealer) says that it isn't necessary. I figured since I'm going to have the whole back end apart for the undertail install I might as well do a Power Commander too.

BDA116 · 08-15-2005, 11:35 PM

Is it necessary? No. Will it make a BIG difference? Not really. Will it help smooth things out and be noticeable? Absolutely.
Really just a matter of if it is something you would like and can readily afford. If so, do it now.

DUX · 08-15-2005, 11:37 PM

Quote:

Originally Posted by BDA116

Is it necessary? No. Will it make a BIG difference? Not really. Will it help smooth things out and be noticeable? Absolutely.
Really just a matter of if it is something you would like and can readily afford. If so, do it now.

Thanks. PCIII it is, and from the looks of this post it should be a PCIII USB?

sheepofblue · 08-16-2005, 12:03 AM

Quote:

Originally Posted by The Sook

"Sometimes resolution can exceed need, thus my question on gain of 250 vs 500"

I agree, BUT, when you say, steadystate map a bike with a PCIII (2-5% throttle) you sometimes see where once an rpm is done, and it starts to let go (brake) for the next rpm, the air'fuel changes heaps between that 500rpm and the next. SO, I'm pretty sure the 250rpm would be more accurate. there's diagrams etc of how pc's work, and I can't put them here (coz I'm a dumb arse that way. lol............ yeah come on, "that way?" haha) But anyway, with that, the pump feature, the individual cylinders etc etc, I'd say it's worth it.

I am curious though, if you know does the Powercommander make changes in a stepwise fashion (ie switch at the RPM in one jump) or does it create a curve of some sort resulting in a smooth transition with the setting only occurring at the indicated RPM?

The Sook · 08-16-2005, 2:25 AM

VERY BASICALLY, yes, it works that way, SORT OF. Inbetween the points of adjustment, is an average of those two points. If you get my drift.

Will the pc make a BIG difference? YES. ESPECIALLY on the RC51. Just wait til you get it done, and YOU tell US what you rekon. I bet any money you'll be going on and on about it. The guy in the shop is a knob. Mapping isn't necessary on their RACE bikes either, but do they do it? Yep. Does it help greatly? Yep. LOL

JAMI6989 · 08-16-2005, 9:09 AM

Quote:

Originally Posted by DUX

Will the PCIII make a big difference with just a slip-on?

My local shop (race shop, not a dealer) says that it isn't necessary. I figured since I'm going to have the whole back end apart for the undertail install I might as well do a Power Commander too.

Stay away from that shop. No, it's not necessary but it is noticable for sure. Yes, it makes a big diff on the RC. Check the dyno runs on Rogue and see for yourself. Better yet, do before and after runs on your bike and you'll see.

sheepofblue · 08-16-2005, 9:33 AM

Quote:

Originally Posted by The Sook

VERY BASICALLY, yes, it works that way, SORT OF. Inbetween the points of adjustment, is an average of those two points. If you get my drift.

Will the pc make a BIG difference? YES. ESPECIALLY on the RC51. Just wait til you get it done, and YOU tell US what you rekon. I bet any money you'll be going on and on about it. The guy in the shop is a knob. Mapping isn't necessary on their RACE bikes either, but do they do it? Yep. Does it help greatly? Yep. LOL

Yep it interpolates based on a table lookup versus creating a parametric curve, in geek speak

As far as a difference I have never rode the RC without (it was on it when purchased) but the RR does not have one. Although it is 100% stock I am thinking of adding a Power Commander, more to smooth throttle response at low RPMs than performance

The Sook · 08-17-2005, 10:35 PM

And that is why MOST people do it on the RC51's too. Coz they are a jerky on/off p.o.s without it. Hahaha Mapped and suspension sorted, and the things are awesome though.

gt702 · 08-18-2005, 12:09 PM

Exactly, mine (early 2000 before any improvements) was almost unrideable at a highway cruise and scary in the corners. I can ride it like any other well sorted bike now. Very nice