DrRossi chip question

As far as I know, if you have a PC111 you'd render the chip useless as you're changing the mapping anyway.

The chip just carries the map, so doesn't matter if it's a standard one, arrow one or rossi one, the PC111 will over write it.
Dr Rossi chip is the cost effective option, but of course it's a fixed map.

May not be perfect, but it should be better than what you have.

jon_melson said:

As far as I know, if you have a PC111 you'd render the chip useless as you're changing the mapping anyway.

The chip just carries the map, so doesn't matter if it's a standard one, arrow one or rossi one, the PC111 will over write it.
Dr Rossi chip is the cost effective option, but of course it's a fixed map.

May not be perfect, but it should be better than what you have.

Click to expand...

So where are the ignition maps and what does a PC do with them?

Now if anybody knows that, it's you!!!

Looks like you're going to show a huge hole in my theory, but I'm man enough to take the fall!

The PC111 adds/removes fuel where required. The fuel map is contained within the Power Commander and when viewed on a computer screen shows revs on one axis, and fuel on the other. The values are either 'plus' or 'minus' a certain % over stock. So for instance, you'd find on mnay bikes it will add fuel at the 4500rpm mark where they usually run lean for emmission tests.

The PC111 plugs in between the injectors and ecu, takes a feed elsewhere from the ecu and is earthed. This is how it manipulates the fuel/air mixture.

Now to my mind, I thought your chip contained a revised air/fuel map so effectively did the the job of a PC111, the principle difference that the chip is calibrated by you and is written in, whereas the PC111 can be updated at anytime.

However, if your chip contains other info such as ignition advance curves, then I apologise.

I'm all for being educated though, so please tell me if I've got it all wrong.

So are you saying that the only difference between chip and pc111, if they both do the same job, is that the pc111 can be updated :confused

Once the pc111 has been mapped why would you want to update it :dunno seems like a lot of expense for the same results...i think i'd rather stick with the Rossi chip :biggrin if you change cans or something then i'm sure DrRossi could do a chip to match it for much cheaper than getting the pc111 re-mapped :dunno

Dr Rossi knows the definitive answer, but it comes down to this: Dr Rossi makes a chip based on his knowledge of the average RSV, with specific mods- like a free flow exhaust and open airbox. However good it is, it is not 100% perfect for your bike. All bikes are slightly different, and depending on the mods and set up will exhibit different traits and characteristics.
A PC11 is mapped specifically for your bike, on a rolling road via analysing the spent gasses from the exhaust. There is an optimum 'clean burn' ratio that the dyno operator will strive for. This is where the expensive labour comes in. Call it £270 for a PC3, then 2 hours labour time. That could be £350- £400!

The Dr Rossi chip is certainly much cheaper, and is plug and go. However, it won't be exactly perfect for YOUR bike. Probably!!!

A 2 in 1 exhaust will need a different map to a 2-2, or 2-1 with the mid pipe cross over due to different back pressures and gas flow.

Also, say you put a chip in a standard bike, then fit a can, then an airbox mod, then 57mm tbs, then go for a 1060 kit. That's 4 different chips.

A pc3 can be remapped each time to suit, and bear in mind that you can download maps from the dynojet website that are given approximations for your bikes set-up.

Dr Rossi has the definitive knowledge on this subject though.

You are right about the PC. :thumbup
But there is more to it than just set the ATF ratio to 13 or 14 to 1.

What I do is test with a PC III usb and make separate maps for separate cylinders.
With the map data I adjust the maps in the eprom.
There are 8 maps.
2 for fuel, cyl 1 and 2
2 for ignition, cyl 1 and 2
And the same sets again on a different address which you can activate if you cut the wire.
I do that for various set-ups, like different exhaust and manifolds in combination with 51, 54 or 57 mm TB's, different air filter solutions and different stacks length.
Then I try them om different bikes from customer to see if there is a pattern.
Then after a lot of road testing you get the fuelling right for a scale of models depending on there set-up and application.
You can simulate a acceleration pump effect just by altering certain numbers in the maps and that is great to experiment with.
With the right ignition advance, separate maps per cylinder, you can alter the feel and power of a engine.
You can stop a exhaust from popping when closing the gas.
But there is just so much you can advance, it is no use to ignite when the piston is only have way up!! :jack
Don't even start about the consequences!! uke
You can activate trim pots and limit there range there is so much in this little black stone. :doug

For a racer top end is more important than drive ability.
But for a lot of us it is a great feel that if the bent opens up and you open the throttle it accelerates fluently.:inlove

I stop here before I get carried away to much.:confused
I have some fiddling to do!! :eatcorn

And just for the record, I do have a Dr Rossi chip in my bike and I'm very pleased with it!

Thanks dr!

jon_melson said:

And just for the record, I do have a Dr Rossi chip in my bike and I'm very pleased with it!

Thanks dr!

Click to expand...

Do you have a pc3 too ? and if not, will you be buying one, or do you think the chip is enough for a happy running bike :biggrin I wont be getting a pc3 as the way i ride i probably wouldn't know the difference of a pefectly set-up map tailored to my bike :dunno

I have a Rossi chip too :thumbup

No, I wouldn't. I'm happy enough with the power delivery of the bike. I'd like a bit more top-end power but I think that's a different story altogether!

I had the bike dyno'd as standard, eventually I'll get it done again but for now my bum tells me it's faster/better/smoother!

sprocker said:

Do you have a pc3 too ? and if not, will you be buying one, or do you think the chip is enough for a happy running bike :biggrin I wont be getting a pc3 as the way i ride i probably wouldn't know the difference of a pefectly set-up map tailored to my bike :dunno

I have a Rossi chip too :thumbup

Click to expand...

Well this gets interesting, I already have a PCIII (no custom map though), and have just bought a DRrossi chip.

So when I install the chip, does it overide the PCIII???

I am totally f&%king confused now, will my Drrossi chip run alongside the PCIII or like mentioned before will the chip do nothing while I have the PCIII hooked up.

The reason I went for the Drrossi chip is that even though I bought the bike with the PCIII already, the chip is around 1/3 the price of the custom map for the PCIII.

Can someone please tell me whats going to happen on my bike :dunno

Cheers Pete

PC is only used for fuel "managment", so the bike will use PC settings, ignition timing will be used from the chip.

Dolenc said:

PC is only used for fuel "managment", so the bike will use PC settings, ignition timing will be used from the chip.

Click to expand...

Thanks Dolenc

So its all good then I guess, I get the benefit on both sides, and its not a waste getting the chip, thanks again :thumbup

Just load a zero map into the pc and have a go with the chip.
Cheers Alain

So if an 07 bike doesn't have a chip and it's updated by using a flash programe, i'm guessing the best way to go after uprating the airbox is to get the latest flash programe loaded and then a PC111 :dunno. Is that right ?.

DrRossi said:

Just load a zero map into the pc and have a go with the chip.
Cheers Alain

Click to expand...

Hi Alain

Heres where it gets interesting again, my PCIII is the older type and uses serial connection and not USB.

So I cannot change its current state, unless I take it to the shop and get them to do it, WILL THIS STILL BE OK TO RUN WHAT I HAVE NOW WITH YOUR CHIP??

Cheers Pete

You can just unplug it off the injector loom & put the stock connectors back onto the injectors to try it till you can sort out your PCIII

Sensei said:

You can just unplug it off the injector loom & put the stock connectors back onto the injectors to try it till you can sort out your PCIII

Click to expand...

If the chip only looks after the IGNITION, should I be ok to leave the PCIII alone and then just fit the Drrossi chip.

Otherwise do I go the long (and expensive way around) and have the chip fitted when I get the custom map done.

But if previous quotes are true, then I should leave PCIII as is for FUEL sorting and put the chip in for IGNITION.

PLEASE PLEASE PLEASE CLARIFY SOMEONE :dunno

Eproms do both ignition & fueling but when you put a PCIII into the bike it piggy backs injector side of the ECU loom & takes over the fueling side of things to put it simplely . As above you can just remove the PCIII plugs off your loom & run the bike straight through the new eprom if you are worryed about the mapping not been correct & supplying the right fuel mixtures . You can try running bike with PCIII connected & new chip but you want know if the bike is running lean / rich without a dyno run . I have a zero map with my PCIII at the moment but still have maps that I use for different times .

Get a serial cable and get the bike near you're Computer or ask someone with a laptop
I can't see why you can't change the map?
I have done a dozen of old PC III's !

DrRossi said:

Get a serial cable and get the bike near you're Computer or ask someone with a laptop
I can't see why you can't change the map?
I have done a dozen of old PC III's !

Click to expand...

Will see if I can , however dont really have access. But the bike runs ok with current map, so should be safe with the Drrossi chip??