tuning with udder only exhaust

[csp808]

Hey guys in thinking up some tips that just protrude directly off the udder with no addittional baffling. Will a canned map from a pc III work. The bike im working with is an 06 s2r dark 800. i looked in the udder and it has the honeycomb assembly inside. If not can the local duc dealer tune the bike to work in this manner with the pcIII. thanks

[herm]

i ran my s2r1000 with only the udder from 1200 miles to 5k, stock tuning.
it ran just fine

[carlosbarrios]

You might be fine as long as you don't open the airbox.  Best thing to do is always get a tune, or at least richen it up a bit with the PCIII.  You might just want to check your plugs to see how lean you'll be running.

[mxwinky]

I would love to see a dyno chart comparing stock vs. this "udder only" mod.  I can't for the life of me believe that it helps add any power at all.  The exhaust system is exactly that, a tuned system.  It is not simply designed to stifle noise.  Length, diameter, flow characteristics and back pressure (yes, you do need some) are all factored in to create a desired power curve and maximize power at a specified rpm.  Any change to overall length and back pressure will definitely have an effect on power output, and not always for the better.  I've seen countless dyno pulls on bikes equipped with straight pipes that reveal the power to have dropped significantly in the low-to-mid rpm range, which is exactly where most people ride their bikes.  Very few of us ride at wide-open throttle and maximum revs.  Drag bikes, yes, which is why you'll see them running shorty little straight pipes.  Street bikes?  No.  Even the road racers use full exhaust systems.  So other than noise, what are you achieving with just the udder in place?  I imagine it's a good money saver, but I can't see it having any benefits over a proper full system, even a stock one, when it comes to power output.

[booger]

I agree- you mess with the exhaust and you'll need a tune. Some perspective for you- when I bought my bike(06 S2R800 Dark) it had cored stock cans with stock headers and udder intact. It idled low - 750-800, but never died. Sounded awesome. Had good power(never knew what the stock power was so I have no frame of reference). I then ditched the udder for a midpipe and had the whole exhaust jet-hotted. Idles even lower, doesn't sound as good to me, and has lost some low to mid range grunt. Also slightly pops on decel which I hate. I am using the stock airbox and filter. Everybody always says if you don't touch the airbox you'll be fine, but I disagree with that. I guess now it's time to cut the airbox, get a PCIII and a proper tune.

[ducatiz]

almost all of the back pressure on the udder-ed bikes is the udder. the mufflers are surprisingly low restriction.

[csp808]

horsepower wasnt really my goal. Mainly i like the look and the noise ,i figured i wouldnt lose much back pressure due to the catalyst but was concerned with the well being of bikes engine internals. i have noticed bluing of the header pipes in stock configuration and was concerned with pushing the envelope with this mod. Happy memorial day . I appreciate the feed back. im certainly going to check my plugs as suggested before doing this  mod and am leaning heavily to the pc3.

[ducatiz]

horsepower wasnt really my goal. Mainly i like the look and the noise ,i figured i wouldnt lose much back pressure due to the catalyst but was concerned with the well being of bikes engine internals. i have noticed bluing of the header pipes in stock configuration and was concerned with pushing the envelope with this mod. Happy memorial day . I appreciate the feed back. im certainly going to check my plugs as suggested before doing this  mod and am leaning heavily to the pc3.

what year is your bike?

05-07 S2R did not have catalyst (Euro2 not Euro3).  It is only a collector.  Some of the later ones DID have a catalyst honeycomb, but the bike spec is Euro2 (no catalyst)

[csp808]

what year is your bike?

05-07 S2R did not have catalyst (Euro2 not Euro3).  It is only a collector.  Some of the later ones DID have a catalyst honeycomb, but the bike spec is Euro2 (no catalyst)

when i had the cans off to remove the rear wheel i saw the honeycomb assembly the bike is an 06 and doesnt have an 02 sensor

[ducatiz]

when i had the cans off to remove the rear wheel i saw the honeycomb assembly the bike is an 06 and doesnt have an 02 sensor

hmm.  that would be odd.  there was a long discussion about this on TOB and none of the 06 models had the honeycomb.  there is a significant weight difference too.. 

[csp808]

hmm.  that would be odd.  there was a long discussion about this on TOB and none of the 06 models had the honeycomb.  there is a significant weight difference too.. 

yeah ive heard that as well. strangely this is an early build 06 being as i bought it in feb 06 so its kinda odd

[ducatiz]

yeah ive heard that as well. strangely this is an early build 06 being as i bought it in feb 06 so

Are you sure it was a palladium honeycomb and not just a diffuser?  You'd really need to look close.

[csp808]

Are you sure it was a palladium honeycomb and not just a diffuser?  You'd really need to look close.

does the diffuser have a difference in color i noticed the color seemed a little different from a automotive honeycomb without the silver whiteish quality

[ducatiz]

does the diffuser have a difference in color i noticed the color seemed a little different from a automotive honeycomb without the silver whiteish quality

no idea, but the version with the catalyst weighs about a lb more than the non catalyst version.  i have a non-catalyst version in my garage, maybe i'll be a nice guy and weigh it for hte record..

 

[csp808]

Thanks for you input i appreciate you guys being so responsive and helpful