S2R800 open loop question

[Smolt]

I was browsing and stumbled across this:
"FYI most S2R800's are open loop systems and do not need a race ECU like a lot of the closed looped bikes out there.  You can get a race power commander III on there with a custom map and it will run great."

What does that mean?  If a S2R800 has full termi installed, does it need a dyno-jet chip to be tuned for top power?  what other alternatives are there and how is it done?  Thanks ahead of time for the knowledge!

[Dirty Duc]

Open loop = no O2 sensor = entirely pre-determined fuel and spark maps (dependent on altitude, throttle position, and RPM)

The problem lies in closed-loop bikes: for emissions purposes, the O2 sensor is the boss of the ECU below ~4000 rpm regardless of what the power commander might be telling the system.

Any time you change exhaust or intake, many will wisely advise you to have the bike professionally tuned.

[stopintime]

We will have to check the pictures to see if there is an O2 sensor on the pipes, but I'm pretty sure all US S2R800 were open loop/no sensor - similar to Euro 2 spec bikes - which were flexible enough to accept slip ons without a DucatiPerformance/'race' ECU.

Even if adjusted to accept slip ons, the 800 will run lean and not at it's best without a DP ECU.

Power Commander 3 works great and will sort out any issues with fueling. Maybe you need it, maybe you don't...

If you can - take pictures of the ECU part # sticker (under tank, on the right side close to the battery), air box lid and along the pipes. Maybe even the spark plugs to get an idea of the fueling condition.

[Howie]

US SR2 800s were indeed open loop.  The udder also does not contain a cat.  You may get away with some exhaust mods (slip ons) with just a CO trim adjustment.  More will require a Power Commander or similar device.

[Smolt]

GOT A PICTURE OF MY BIKE!!! how do i insert it... anyways here is a link to it:

Doesnt look like it has a cat, and so it needs the ECU tuned? or replaced?  It may already be done though, and so I would check by looking at the chip under the tank? Also, dynojet3s run about $400 right?
LAST question! Does anyone have a dyno chart comparing stock setup to full termignoni+power commander upgrade? What are the HP and torque gains?  thanks thanks!

[stopintime]

My 800 got + 3-4 bhp and + 7-8 Nm from the full system.

[Smolt]

sweet thanks for the data

[salbalboa]

My 800 got + 3-4 bhp and + 7-8 Nm from the full system.

Is it worth the cost for that little increase?

[stopintime]

Is it worth the cost for that little increase?

My reason when I bought it:
Sound

My reasons now that I know what it means:
Sound
Smoothness caused by the ECU and better breathing
Richer mixture with ECU is good for the engine

Most valuable mod for the S2R800:
Suspension
Brakes

[salbalboa]

Brakes is a good one. I don't even think my back brake works its shocking

[madalf71]

+1 with Stopintime.

ECU mod or tuning a must with pipes and box. There's quite a midrange dip to tune out.
I was lucky enough to test ride a standard and modded bike before purchase.

Yes standard S2R800 front forks are yuk. Have a look through the posts.

Brakes, I'm ok, but then again I'm not a heavy weight, or do track days.

Good luck.

[DucNaked]

[Smolt]

Thanks, I'll be figuring out how to have the suspension set up for me! 

[BK_856er]

Local Club Boards (look to left for link) might be able to steer you to a local suspension guru.  Where are you located in CA and what is your approx weight?

Might just be the photo angle, but the rear looks a little low??  Sometimes POs with short legs lower the rear for that comfortable flat foot feeling.  You'll want to confirm the baseline rear height (bike geometry) as part of your setup.

BK

[Smolt]

Im 6'2" and 190lb.  Located in Orange County southern california! so... ya, no problem flat footing here.  ill look into local boards for local suspension masters!