What is a "TRE"? Well........

Background: Modern electronics allows the manufacturers the ability to tailor power in ways that were almost impossible 20 years ago.

 

The Origin:
 

• Denso Japan told Yoshimura Japan how the newer bike ECU's (the bike's computer) how the "gear"  selection signal affected the maps that the ECU, with the most optimal fuel and ignition being the 5th gear map. From there, it went to Yoshimura USA, and then a mechanic there told a buddy who worked for Team Suzuki and then we heard it - way back in 1998. It's a relatively simple device, the packaging, connector are the tough part and the internals are simply a 6.8k resistor and proper assembly techniques.

So... what does it do for the bike?
 

• 1. On a large bore bike, like a gsxr1000 or a Hayabusa:
   

  • a "TRE" will make 1st - 2nd - 3rd significantly more snappy. - great for play (if 150 hp and 400lbs is playing) and general tomfoolery. Play drag racing and play "trackday" bike use.
     

    • Busa's  - Not particularly recommended for semi to serious drag racing - as the increased "part throttle" power makes it a ***** to launch as compared to the "restricted" non-TRE 1st gear power. Still ok for play dag racing.
       

    • GSXR1000 - A gsxr1000, of any year, makes too much (yes, too much... ;-) power in 1st, 2nd and 3rd for roadracing on the average length track. The NON "TRE" power is much more controllable on the track. The "TRE" power just makes the bike too sensitive in the lower gears when exiting corners. As far as a trackday sort of bike, because you aren't generally doing 2 wheel drifts, etc, the "TRE" is fine. Does better wheelies and burnouts.
       

• 2. On a 600 or 750 - it's fine for most track uses. You could always use more..........  <big smile!>
   

Speed Limiter in top gear?
 

• "Speed Limiter" might be a misnomer.  It it was a "speed limiter", the bike would have to know how fast it was going - The bike doesn't really know if you changed the gearing, does it? (no, it doesn't). What 6th gear map does, actually (as of 06 on Suzuki's, at least), retard the ignition timing a few HP's worth, over the last 500 rpm before the bike's tach redline. Mybe cutting a few mph off the top.
   

What's a "Smart TRE"?
 

• There's talk of bike's not idling well when the regular ol "dumb" "TRE" is installed - That's annoying.... (from a tuner's point of view)
   

  • It's because the low rpm / idle mixture needs to be "right" if the ignition timing is where it should be for Best Power / Best Idle. Retarded timing (stock / non "TRE") allows the fuel tuning to be sloppy and off base. If one uses the Teka SFI to tune the idle fuel, there's never a problem idling (makes you wonder......).
     

One "Smart" benefit is that you don't lose your neutral light.