THE DYNO AND YOU

The dyno is very good for telling us what makes more power and what doesn't. My Guzzi Sport 1100 has over 100 dyno runs logged. The success rate for extracting more power is less than 50%. Why, you ask. Because you never know what will work until you try it.

The dyno also shows us some other things.

Like how a bike will feel as it accelerates through its rev range. A power curve with a steeper angle toward the top end feels like we all imagine a race bike would. A 748 has this kind of curve. On the road, you feel this as a top end rush.

You could modify this 748 to make the same top end power, but with more in the midrange. The angle of the curve would flatten out, although it would be higher all the way through to the top end. Show the owner the flash dyno curve, charge them lots of money and send them on their way. More than likely, they will be back very soon telling you their bike is slower.

Why?

Because the top end rush they liked so much is gone. Flattening out the power curve has robbed them of the sensation they liked so much. The new constant ( and faster )acceleration does not feel as good. All that good work down the drain. Believe me, this is not a good feeling. I know, I've had it happen. I then spend an hour trying to convince him or her that the bike really is faster. About the only confirmation you can get is by asking them if they are using the brakes more. If you get them onto a racetrack we know they will soon change their minds, but the seat of the pants feeling is not good.

For this reason I now stay away from expensive mods wherever they cannot be justified. Spending lots of an owners money is usually very good fun for a while, but justifying small results gained per large dollar spent is not. The most enjoyable part for me is extracting usable performance without pulling an engine apart

Some people still have a need to spend a lot of money, for whatever reason. While quite happy to support this, I do all I can to make the owner fully aware of the expected result.

Many of the things I now recommend show little or no gain on the dyno. For Ducatis, a 14 tooth front sprocket is about the best value for money mod you can make. The wheelie guys love them. The bike makes no more hp, but will give you the result many will feel most, the much loved RESPONSE.

Response does not show up on a dyno, nor does it show up on gentle throttle applications. For the guys and girls who open the throttle a little quicker though, this is where it's all at. Many of the common mods people make, such as an open exhaust system, are felt as improved response.

Following is a list of the common mods I recommend.

For fuel injected Ducati : open style mufflers, modified cam timing, a programmable efi eprom (chip) remapped to suit and a 14 tooth front sprocket.

For carburetted Ducati : open style mufflers, modified cam timing, jet kit and a 14 tooth front sprocket.

For late model BMW , the availability of open style mufflers is quite good, but there are not many eprom options. Most models run acceptably with aftermarket mufflers and standard eprom, but a well mapped eprom is always a good addition. The cam timing mods we make to Ducati models are not an easy option for BMW owners. This is due to the cam drive system (chain instead of belt ) and the non availability of adjustable sprockets. This may be remedied for R1100/1150/1200 owners in the near future, but the gains to be made are not yet known. On the upside, I have recently purchased an R1100S, and will be working in conjunction with a fellow in Sydney named Lennie the Modifier to see what we can get out of it. Lennie already has some parts in the development stage, so look forward to some playing.

For any results of our playing, look under the various model headings for the relevant info.

If your model isn't there, but you live in or around Melbourne we would be more than happy to have a play with your bike to see what we can do for you. Just give us a call and ask.

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