I CALLED MY FIANCE' SHE SAID THAT HE DID DO THE DYNOTEC PULL IN 5TH GEAR...SPEED WAS 180 MPH,
Bunch of stuff for this thread in general -
When doing dyno testing on a dynojet dyno, especially on high hp bikes, like the Busa, you should use top gear -
One of the biggest problems with dj dynos is that the run is finished before the combustion chamber material reachs real world operating temperature. That means that whatever ignition timing and fueling works best "on" a dynojet dyno, isn't exactly what works best in the real world -
That explains why people go to the drags and end up fiddling around with the mixture on their pc3's to get best track performance. The same goes for people who use the TEKA SFI to tune their stock ECU's (w/o pc3's).
Using top gear on a dynojet still isn't enough load to equal the real world, but it somewhat better than using 4th gear. (why 4th, anyway??)
The "jittery" readings, w/o a TRE or Teka FIRE are an indicator of that low load dynojet problem... You don't feel that "jitteriness" when riding in the real world........ but... there it is..... on a dynojet. Adding more ignition timing makes it work on the dynojet, though... and it is snappier in the real world, too (in this case)
Yes- the TRE or Teka FIRE "do" actually work better in the lower gears but I can't seem to duplicate the <25% throttle statement that someone started! lol! It's certainly not that way on a gsxr1000!
As far as tuning in a certain gear with a TRE/FIRE, the difference in indicated a/f ratio has a lot to do with the effects of ignition timing a dj low combustion chamber material temps affecting alleged dj "a/f ratio", rather than the real amount of fuel delivered. That's been proven with people on this list who tested a customer's Busa and found that his dj dyno said that the bike was at 16:1 to 17:1 in some areas, even though it was making excellent power.....
Now, any engineer (if he thinks about it) should be able to tell you that if it was a "real" 17:1, the engine would simply fall flat on it's face, fully bogged down to "not able to run at full thottle" conditions - It's just chemically bizarre - too many oxygen molecules and not enough hydrocarbons to oxidize with - the air and fuel are so sparsely distributed that the domino-like process skips around and fades away -
So - the hoopla about "tuning to an a/f ratio", generated by an O2 sensor, in the "magic gear" on a dynojet or inertia dyno is a little overblown.
The actual different amount of fuel delivered in different gears, without a TRE/FIRE is actually very small, though the ignition timing is def. different in different gears.
Background - I design dynes and test routines and hold patents on dyno drive rollers, carburetors, ignition advancers and engine covers and have done work for just about every roadrace raceteam and most manufacturers, inc, Honda, Kawasaki, Suzuki , Yamaha, Muzzy, Yoshimura, Attack, Arclight, Vesrah, Belgarda, Vance and Hines -
Thanks!
Marc
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