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Development Dyno

A rider usually brings her/his machine in for dyno testing because the bike does not perform as expected—maybe after installing a bunch of aftermarket parts, for example. If you’re a racer, it’s generally because you’re getting beat at the track.

Whatever your reason, keep in mind that a dynamometer is a measuring tool. It allows us a window into how the engine is running in it’s current state of tune. From there, we can make changes to improve the performance of your machine. However, more power doesn’t always result in better times—it’s a combination of rider skill and the overall setup and capabilities of the motorcycle.

With that in mind, here are some commonly asked questions and answers regarding our dyno service:

  1. What happens to my bike on the dyno? We load your bike on the dyno, strap it down, enter data, check the tire and go through a warm up cycle. Then, we subject the engine to a load at various RPM points. At each point, we take a sample of the exhaust gases created by the engine.
  2. Can my bike fail on the dyno? Dynamometers subject the engine to load to measure horsepower. It’s pointless to have the strong guy pick up a pebble; you have him pick up the heaviest bolder he can manage. The point is to see just how strong he is. If the subject has a damaged back, picking up a bolder may not be such a wise idea. In other words, dynos don’t break engines. A failing or not-so-healthy engine could fail while on the dyno, but chances are that it was going to fail anyway when you hit your favorite open track.
  3. Should I run my bike on the dyno? If your bike has been making knocking noises for the last week. The answer is no. If you and your buddy put in some new cams and it’s a bit noisy, then no! If it ran out of oil last week, and you just want to make sure it’s still sound—the answer is no. On the other hand, if you have a well-maintained bike—regardless of age—then the dyno won’t do any damage.
  4. How much does it cost? It depends on what you want. A base run, just to see the magic numbers, will run you $50.00. Dyno testing with exhaust analysis and F.I. mapping (power commander, Tune Boy, TEKA, Yoshi) or carb jetting will cost $400 to $500. Some may ask: why so much? The best guys on the job, with the best equipment available, with the most accurate results, are—as you might expect—more expensive.
  5. Why so much fuel? Unlike the other dyno machines, we do things a little different. When mapping the entire fuel map of the bike, the engine is run up to all load points and held there for approximately four seconds. So imagine you’re going up a hill of varying grade—for illustration purposes, we will consider 100% throttle and the GSXR750 I tuned today. Flat out @ 2000rpm 4 seconds, 2500rpm 4 seconds, 3000rpm 4 seconds, 3500rpm 4 seconds, 3500rpm 4 seconds, and so on to 14000 rpm. So you can imagine the testing involved for 100% throttle, 80% throttle, 60% throttle, etc. Now—while doing that—a lot of time is lost monitoring the engine temp, radiator temp, oil temp and rear tire temp to avoid exceeding recommended ranges. If any of these parameters threaten to move outside the expected values, we end the run until they return to safe values.A Hayabusa, on a typical summer day, will take two days to finish—plus two-and-a-half tanks of fuel. You want it done right, don’t you?