Question for Doraemon... how loud is your exhaust after you removed your cat. was thinking the same..( thinking about getting the GPR ) where are you going for service? did you contact the dealer about warranty issues after the mod? sorry about all the questions
I would think the warranty would be shot on the engine and the exhaust. The engine needs an exhaust with a specific back pressure which I am sure does not exist anymore more. The valve clearances and timing may also be different
The one thing that you can change is the type of oil you would use as the oil bmw specifies prevents damage to the cataletic converter.
Just my opinion and thoughts. If you do any modifications to the scooter bmw will use any excuse not to warranty the scooter and you are on your own. I say do not do any mods till your warranty is up, or at least close to the end
I have never heard of cat friendly oil, if you are getting oil bypassing the rings more than normal this early you got serious problems before you even recieved the scooter.
thanks
The power commander was really easy to fit. you unplug the O2 sensor and plug the harness in line with both fuel injectors and the throttle position switch. It comes with a fuel curve already made by Dyno jet. If you look at the dyno curves I have put in the gallery, you will see that the A/F ration from BMW stock is very lean on the low rpm side. the PC V curve has a much richer fuel setting. Additionally I have more fueling added and dyno tuned further than dynojet did.
For the dyno, the scooter was actually having trouble with traction.... while the only confirmed pulls on the dyno were curves at 51whp, there were several 53whp pulls but the curves were not consistant enough to count. That being said, this fall after a few miles on it I will put on a Dr. pully clutch and mallossi variator, it should get more power to the wheel. Even now the increase from 47WHP to 51WHP is nice, but if I get 53WHP, WOW! at 51whp you are already 9% hp increase and getting over 10% would be great. My old Burgman 650 with the same mods wouldn't get past 5%, 43WHP was the most we got out of her.
As far as riding, immediattly I notice that I use less throttle across the board. rollon acceleration 60-80mph seems much more pull. I was actually supprised on a few of the first take offs from a light, I was pulled back in the seat more than I was ready for. For fuel mileage, in stop and go traffic I am close to 45mpg, mostly how I ride......drag racer blood he he. On the highway I am usually riding in traffic, so a little hard to judge, but seems closser to 50+. I will know more on a few more tanks of fuel. I am also taking a 350 mile trip next month which should give a better highway milage report.
Now, considering all that, I also have times when is wants to stall, but with the PC V, it doesn't. Before I had the PC V I had a few times that the stalling issue occured, since then, none. There are some times is sounds like it will, but doesn't...my stalling was on different vendors premium fuel, both with Shell and 76. I think my richer fueling helps but fuelling is not the problem, or else it would not even try.
Hope this gives you the info you are looking for. Oh, it was cheaper to purchase directly from dynojet than on ebay.
I haven't used either yet myself. that why I started with what I know. I am leaning to the malossi variator as I see all the Italians on the bmw website talking about it more than the Dr. pulley one.
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