R1100S PLAYING WITH CAMS AND TIMING USING BITS FROM BOXER PERFORMANCE ( and some side notes )

Some more playing with my R1100S, this time some different cams and cam sprockets from our friend Lennie at BOXER PERFORMANCE.

A short note here too. I have now given up trying to make the dyno charts of this bike look good, particularly when it has the Boxer Performance INDUCT fitted. It got to the point where we would do a chip, then I would waste a whole lot of time trying to get the dyno curves to look good. Always by leaning out the top end. The problem, however, was the top end always suffered on the road. Now I leave the mapping as Duane intended, as it always works well in the intended environment ( the road ). Unfortunately, some people just can’t get past the dyno curves. Pity.

First up, some cams from Boxer Performance. These are the cams Lennie first had in his bike when it went over 100 Hp. He sent them down to me to try out. I fitted them to my bike and took it down to FIM to map out a chip for the combo, being STAINTUNE, INDUCT and cams. Riding the bike, it felt a little down at the bottom end, but better in the upper half of the rev range. Certainly revved out to the limiter faster than before. Some more fuel ( particularly at the top end ) was required, as expected, and the bike certainly responded to it. As Duane said at the end of the day’s testing, the combination was the fastest the bike had ever been.

The dyno bore out the top end improvement. Keep in mind, for some reason, the dyno really does not like the INDUCT, so the power output is lower than you probably expect. Don’t worry about that bit. The comparison between before and after is what the graph is showing. The general shape is the same until the top end, where the bike pulls straight into the rev limiter. I’m not sure if Lennie is going to market these cams or not, but at least one set exists. If anyone wants them, there is a chip available to suit the above combo. Contact Boxer Performance if seriously interested. Anyone who fits the cams, pipe, duct and chip will find a much faster bike than standard.

Anyway, the graph. Red is Boxer Performance cams, green is STD cams. Both are fitted with STAINTUNE, INDUCT and FIM chips to suit the combos.

Dynograph courtesy of DYNOBIKE (03) 9553 0018

Now some cam sprockets. Lennie at BOXER PERFORMANCE is manufacturing some cam sprockets with new cam locating pin positions relative to STD. This advances the cams from STD timing by a fixed amount. With some test samples available in both 6 and 9 degree offsets, we chose the 6 degrees sprockets for the R1100S and developed a chip to suit the usual combination, being STAINTUNE and INDUCT. The biggest improvement I felt came during the chip development, being the mid range roll on effect. As expected advancing the cams filled up the middle, but I was surprised by the increase in acceleration in the mid throttle area with the new chip. Right in the roll it on to pass a car zone. It actually started to frustrate me when I was trying to get low rpm / high throttle samples, as the bike accelerated out of the 3,000 RPM zone almost instantly, even in top gear.

With the benefit of hindsight, I would probably run the 9 degree sprockets, as the top end didn’t seem to suffer at all as far as I could tell. For these, the chip developed for the 6 degree sprockets will work just fine. Just a little more go in the middle, perfect for us road riders ( on the perfect road bike? ).

The dyno graph below shows the before in green, after in red. A nice little increase across the whole range, but the major mid throttle improvements are obviously not shown on a full throttle dyno run. Between corners on a good road you really notice it. Another one of those mods that, first time out, creeps up from behind and smacks you on the back of the head when you realise you’ve left your braking too late. Before ( STD sprockets ) is green, after ( advanced sprockets ) is red.

Dynograph courtesy of DYNOBIKE (03) 9553 0018

I must say, with this engine tune configuration, my bike is far and away one of the most satisfying road bikes I have ridden. The recent addition of OHLINS front and rear has likewise transformed the chassis, especially the front.

And for the quiet ones. We have also done a chip for the STD exhaust, INDUCT and cam sprockets. Partly out of interest and partly as this is a viable low noise performance option. As well, the exhaust is also by far the most expensive part of the combo, so this is a good halfway point for those where cost is a consideration. Well, a relative consideration. Adding the exhaust later would require another chip swap, provided by FIM on a change over basis free of charge.

A side note here. The mapping for this chip was done after we had done the chip for the same combo, but with the STAINTUNE fitted. The change to STD exhaust, after riding the bike with the STAINTUNE, was pretty obvious. Rather unresponsive in comparison, it felt much the same as my bike had when I fitted the STAINTUNE baffles at one point. These are the steel inserts that come fitted to the STAINTUNE mufflers when you purchase them. So the benefit of an open exhaust was made very apparent here. I must also say here that I actually have to ride a STD bike occasionally just to remind myself how different mine is. I do lose sight of just how good my bike has become. It usually amazes me how slow and soggy they feel. Perspective can be a real problem sometimes, especially with all the things I get to ride.

Anyway, back to the story. The bike still went very well none the less. A nice midrange compared to a STD bike, it also revved out much better than a STD bike would, so the effect of the INDUCT was easily felt. I was actually surprised at how much better the top end felt over a STD bike. I had expected the STD exhaust to mask the INDUCT effect somewhat. As I have said previously, it goes to show just how good most STD exhausts have become in outright power terms.

Overall, a very good mod for those who use their bike rather enthusiastically, but who don’t like/need/want the extra noise. A great return for the cost too, in "on road satisfaction" terms. The graph below shows the improvement. As you can see, the on dyno effect of the INDUCT ( killing the top end ) is present again. At least it’s consistent. I would be concerned if it wasn’t. Green is all std, red is cam sprockets, INDUCT and FIM chip.

Dynograph courtesy of DYNOBIKE (03) 9553 0018

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