Could be.

All this brings to mind another point. The ECU has programming in it that looks like when the EXUP went open, they added fuel via a special table. This implies they knew the EXUP was killing power as they expected it to require less fuel while it was operating. This is part of what is a bear to conventionally tune to rid the bike of the "Surge".

i have a ciber friend wo wrote long ago..." Bad_Max wrote:Yamaha says it removes all limiters. We don't know what all is limited now do we? There could be timing advance/retard limiters, fuel limiters etc. Till someone from Yamaha engineering comes forth and explains the differences in the programming of the chip, we may never know" but one with a similar picture wrote "It only removes limiter"
"I guess some people don't need to learn" I ride a bike EVERY DAY since 1974, arming and disarming bikes, I had all kinds of bikes that you can imagine, I have run and won 6 years regional championships quarter-mile, we ride bikes here with nothing (cero aftermarket pieces...cero), we drag with rubber strips glued in the rear tire attached to take grip (not achieved M / T)and oxygen (no nitro), probably "couple of bypass tubes welded into the cat..is not the solution" I know!! but believe me it works remarkably well. Never knew that answer to the Japanese engineers think while doing the RACE ECU ¿for what kind of v max? mods or not?, it is easier to say "dont know".In Japan were made 3 different displacement engines before choosing the 1679cc for the max, power was not the only purpose on this engine and the EXUP is related to that.Sorry I can not write or understand English perfectly but I see that Tim knows a lot and kindly answered.
Yox185 :I want to tell you your question is very very good I'm thinking that right now

Yeah I'm that guy Bad_Max from years ago. I use No_Max now since I sold my Vmax to another member here. Yamaha told us back then it removes all limiters, but what does that mean? Tim tested the race ecu vs the standard ecu (even using a scope)and could find no discernable differences in the timing and other areas. The race ecu must have a slightly different MAP to keep the bike from running lean at the extended RPM's but that's not near the same as reprogramming an ECU to make butterflies open further & faster, to advance or retard timing in critical areas, or MAP each cylinder individually to achieve a better air to fuel ratio. The race ecu is for people who simply want to extend their rpm range or "Race" their bike. A reflashed ECU is a much more complete solution that addresses many areas of the Vmax that needed improving..

www.vmaxguru.com/Tech/Gen2/Pages/Race_ECU/Race_ECU.htm

"As for me, I would say to hold off on the Race ECU."

"I feel there is a slight difference in the two ECU's but not enough to justify purchasing one for an all stock bike."

"Another test that seems to state the Race ECU does nothing more than remove the top speed limit."

We didn't know much back then, but Tim is a seeker of knowledge, and did exhaustive testing to try to find any real differences between the ECU's (other than the limiter removed). His efforts are well documented and you can draw your own conclusion. I did a long time ago.. A stock ECU with a speed delimiter chip, or speedo healer, accomplishes the same results as Yamahas overpriced "Race ECU". Buy it if you want to, but I'd spend the money on a real exhaust first, and later add a reflash instead of a fuel controller.

already knew it was you so I put it,
doubted before and now are strict.
When you do flash with tim, you know perfectly to what kind of bike is the flash, I just wondered if the race ECU is designed for motorcycles with original exup or cat, or exhaust 4-1, 4-2, 4-3, 4-4, 4-5, 4-6, etc or monster filter, or, or, or, or, because I know bikes with R ECU with many many many mods and the R ECU is not magic,I think was programmed for absolutely original bike ,that was my question, anyway it is not important, peace and love, excuse me

Spend your money on a real exhaust. You'll be much happier than buying a race ecu. Peace to you too!

dear Tim, very instructive graphics, THANKS...my English is not good as you have noticed, but I seemed to understand that you said that one of the EXUP functions (among other things)is the gases deviation to second cat converter core, even if this is what you said, is a mistake, after EXUP There are currently no cat

Here is a dyno graph of back to back runs of a stock bike with a standard ECU and Race ECU. Forgot that I had this.

You can see there is very little difference throughout entire power range with slight gains (less than 3 HP) above 7K rpm.

waoooo..bad thing..I travel in a few days to eeuu, ¿if I send to tim by USPS priority June 12 from LA my ECU, you think can he send the ecu reflashed to a hotel in NY 20 days after? he is sleeping poorly for the child and has a job waiting...jaja