For those of you that may be interested.... i took Delicious Delilah to Chris at CJS racing today. Here is a brief run down of the day. Started really early with a wet and hard ride to Bristol to be there for 08h30. Chris was busy with a 848 from Luigi racing, looking for an intermittend fault (apparently the 848 would cut out willy nilly). Quick cup of coffee and the Multi was on the ramp, tied down safely and the connection process started Unlike some Dyno tuning companies that place a prod in the exhaust, Chris attaches air fuel sensors directly to each manifold. this allows the individual cylinders to be tweeked. The Dyno dashboard shows plenty information, including RPM, the Air Fuel ration (AFR) for each sensor/cylinder as well as the TPS (throttle position). Chris then runs the bike and gets the current map. Its quite concerning when the motor hits the rev limiter at around 10200 RPM...well for a desk jockey like me anyway... The concept as far as i understand it, is to get the AFR for each cylinder in a range between 13 and 13.5, in each gear, creating a 3 dimensional map or plot consisting of 12 different maps. Add to this the spark timing maps and you have a total of 14 maps that need tweeking. Now the wizardry starts, and Chris tweeks the binary codes for each map, trying to lean out or enrich the mixture of each map at different rev ranges. A tedious and time consuming affair. A lot of time time was spent in the 1600 to 2500 RPM ranges, expecially in 4th gear where I found the surging to be the worst. Finally after 4 hours the AFR of both cylinders were within the required parameters, and the spark ignition of both cylinders were set, meaning that both cylinders are in perfect symmetry. Final results...no surging, increased horsepower and increased torque....oh yes and exhaust servo disconnected as well as the O2 sensors (meaning the bike runs only on the set parameters, no more fuzzy logic) All in all a very interesting day, thanks Chris (feel free to make corrections if i made professional fact to layman fiction) Synopsis...bike is smoother than a babies bum, and scary power let me know if you are interested and I will post two more screen shots of the maps
Thanks for interesting post.. i knew these multi's were powerful, Did I read that right..150 at the rear wheel, eye sight not as good as it was. If so thats excellent.
If the Euro meddlers get their way non of us will be allowed to do any of this in a few years. Type approval and anti tampering is creeping it's way in; Keep up the fight against!
Sorry I didn't make it today Fritz (and for not confirming either way)....I was going to jump in the car and pop over but something else came up :-( Sounds like you had a very worthwhile trip Yes please do post more graphs and maybe replace the one above with a larger version..... struggling to read it ;-)
More graphs So here are some more graphs for the pundits amongst you The first is an example of the dyno run front cylinder at 15deg throttle position. Important is the bottom graph, showing the Air fuel mixture. What Chris tries to do is get the line between the two values At the end you can see a 3 dimentional graph as below showing the (i believe) the power at the different throttle positions at different RPM for eachof the cylinders. and finally the power torque curve again for those that couldnt read it. Bigger file this time, but yes 150Hp at around 9000rpm. View attachment Dyno results scan0001.pdf Nigel, i am riding with a Mivv de cat pipe (£100 from pumpman) and a termi carbon stubby (£299). Its damm loud, but i love it...scared of the old bill though. However i still have the old tin box (cat) and managed to buy an ECU from a breaker which was tuned yesterday, so if push comes to shove... I can revert back to original overnight! Same goes for MOT's in future, although people have said that it should not be a problem??? Richard, i think what will happen with the EURO meddlers is not that you wont be able to make changes, but that every change you make will have to be validated in the log book....like the germans do currently. i am like you though in that I think the buro"crazy" will be an added burden and again will take away our freedom to decide. Better get all those mods done now! Andy...no worries mate, we will meet up one day soon)
Most excellent, same set up as me but I've put a baffle in the pipe as it was just that little bit too loud. I have to say, I've owned Aprilia V twins, Honda V twins and Suzuki V twins and this is the first V Twin I've had that I think sounds shit.
I would agree at low revs but once opened up I think she sounds great. This work at CJS. Is it still about £500.00 big ones boys?
These MTS's have no "soul" if that makes sense? Just sound like a big single scooter x 2 with no baffle. I was soooo ashamed of the sound I've bought a MiVV baffle to put it which hasn't helped much to be honest...
I had a BR baffle in, but it robbed me of too much fuel consumption and power. An to be honest made hardly any difference to the noise, so out it came. If a good priced Gibhli comes up on eBay I may just go for it! Yep 500big ones was the price...495to be correct!
It's a BR one I have in there. You reckon it increased the fuel consumption do you? I'm seriously toying with the idea of putting the stock exhaust back on it and just attaching the Termi or finding a tail pipe that has some silencing in it as standard.
I would not suggest you go back to the standard. Keep the de cat pipe, and get a better silencer like a full lenght termi or gibhli (i believe they also have removable baffles???). speaking with Chris, he maintains the BR baffle robs you of 20-30hp, (he feels they should be banned) and to be honest...I did not notice much of a difference in sound, so as I said...out it came. Makes sense acually....youre trying to push a 50mm diameter air volume through a baffle that restricts airflow to probably something more akin to 25mm. (there is a post somewhere that actually measured the holes and added them together...):frown:
Perhaps I should clarify that the baffle I have is a MiVV decat baffle like this; MiVV DECAT BAFFLE DUCATI MULTISTRADA 1200 2010 on | Motorcycle Exhausts | Performance Parts And not the flat plate with holes drilled in it that I have seen elsewhere. Is this the same one you are referring to?
