Here's an interesting one....
My 1000DS was on my mates dyno yesterday (for 16 miles!!!!) to rewrite the map on the Power Commander since fitting a set of Sil Moto Spaghetti headers. Dave spent a long time trying to get the best set up using a lambda probe in one exhaust but couldn't sort the fueling at higher revs. Now, Dave has seen this before on loads of Ducatis, especially 2 valve motors. The reason is that the two cylinders need mapping each as to get optimal running he's had to have fuel settings as much as 40% different on each cylinder for the same revs!
Dave has a twin Lamda probe set up and is going to finish mapping it next week as we couldn't get the probe on the rear header in the time we had. On the plus side the front cylinder is spot on!!
The power and torque curves so far are very good, very straight and very clean, no lumps and bumps but slightly truncated at the top end where the rear cylinder map is not right. Even so it's making over 90hp at the wheel and Dave reckons, based on experience in tuning Dukes, that there should be between 5 and 10 more to come!
Will post the graph up next week all being well.
Anyone contemplating some Dyno work, might be worth trying to get each cylinder mapped.
Part 2......
Bike now fully mapped, with individual maps for front a rear cylinders, having spent over 30 miles on the dyno....!
Overall horsepower and torque are a good 15% better than a stock bike (stock makes 84bhp / 62lbf at the crank, mine is giving 98.8bhp/73lbf at the crank) and the adddition of the Sil Motor Spaghetti Headers hasn't had a massive impact to be honest, only a couple of brake better than the stock header pipes. It is due a shim service and the cam timing needs checking so there may be a little more yet to come.
However, the best bit is the mid range and throttle response. At 3000 rpm the new fuel maps have given a 30% increase in torque, mainly due to getting both cylinders running properly and in synch. It's bloody ace on the road and will lift the front in second off the throttle even with my fat carcass aboard!!! The difference in the before and after torque curves is huge, before it was a jumpy line, now it's smooth and linear and starts much higher!! The throttle response is almost instant and very smooth when going from a trailing throttle to applying power. Overtakes are a breeze and crests in the road are an easy excuse to save tyre wear!!
Anyone contemplating some dyno time, I'd recommend finding someone who can map each cylinder independently (The power commander software allows this) as the results are well worth it
Ped
Yup! Even on a Testa! [thumbsup] Actually downright scary... [evil]
Good info to have. I would say that if you can, do a quick map recheck after you set the valves and time the cams. Getting the map done when the rest of the engine is in perfect tune will give you the best result, otherwise you're just compensation for things that may be slightly out of spec.
Interesting that the header didn't make much difference. Was it the stock header with aftermarket pipes before you swapped it? Or did you do the header and cans at the same time?
I always kind of wondered what effect an open air box and power commander would have using the stock mufflers. Does the engine really need exhaust mods to make more power or just better intake and fueling? Since aftermarket or cored pipes are the first engine mod almost everyone does I don't think we'll ever know for sure.
Scott
Yeah, bike will be going back for a check once valve clearances and cam timing is done.
The bike had DP Titanium hi levels on with the stock headers prior to adding the Sil Motor system - just proves the stock system is not too bad at all!!
My Dyno man has started using a different system to the Power Commander, called a Rapid Bike. He reckons this is much more sophisticated and allows much better set up. He's got one on the go at the minute on a turbocharged Multistrada (yep, you heard right...!) mainly so he can adjust the ignition timing to stop the thing grenading all over his dyno.
As a side issue, the Multistrada pre turbo was making 98 brake at the rearwheel from a 1000DS motor with a PC3, open airbox/K&N and a full Sil System which leads him to think a bit more top end may be possible with mine.
First run on the turbo Multi gave 137 hp at the wheel and 95lbf torque....... gulp! It's only running 0.6 bar of boost too.....
Very interesting & thx alot f sharing! :)
Quotethe two cylinders need mapping each as to get optimal running he's had to have fuel settings as much as 40% different on each cylinder for the same revs!
Seems extreme, has Dave any info on why this is so?
Quotestock makes 84bhp
Older, rear wheel spec. 95 Hp at crank.
Quotethe two cylinders need mapping each as to get optimal running he's had to have fuel settings as much as 40% different on each cylinder for the same revs!
[/quote
Some difference is to be expected due to tuning and injector variation, but that seems a bit much.
I don't think the Strada needs more boost than that. Wow.
Quote from: greenmonster on April 28, 2009, 06:33:38 PM
Very interesting & thx alot f sharing! :)
Seems extreme, has Dave any info on why this is so?
Older, rear wheel spec. 95 Hp at crank.
Seems the injectors from the factory are not well balanced, he's seen it on most models
According to my owners manual, my 1000DS is rated at 84bhp at the crank....
with a pc3 you don't get to see the underlying map, so there's every chance you're reversing an offset map setting. lots of the 916 chassis bikes want a lot more fuel on the rear cylinder from 5,550 to 6,500, then it's not that different elsewhere.