Just wondering???

Also, if so. . . are there any warnings about running Race Gas on the tank or in the manual?

(Some of you may know where I'm going with this!)

 

No it does not run an 02 sensor . That's why you need a control box like a Dobeck TFI or a Power Commander to remap the fuel crve to take advantage of any mods you make. As far as race gas, you don't need it. It will actually slow you down as the 700R does not have the compression to support it. Race fuels slow down the burn time so you can have a more controlled flame front on a high compression engine. Pump 92 is all you need with stock compression.

 

O2 sensors are extremely unreliable, and so are the jetting tools using them.

 

That's good to hear. . .

Correct, no reason to run race gas on the stock bike.

If you put a higher compression piston in that's a different story.

The thing about race gas is that it is leaded so, if there was an O2 cell on the bike I can see a lot of people trying race gas on a stock bike and ruining their O2 cell. Was just wondering what Yamaha was doing for that and sounds like they've just stayed away from the O2 cell.

So, how does it re-map after modification? Various temperature sensors? Or, do the various control boxes allow for re-mapping via user interface?

Is there a static pressure sensor to adjust for altitude? Static temperature sensor for temperature compensation?

Thanks for the info.

 

A broad statement. Cars have been using O2 sensors for over 20 years with unsurpassed results. Maybe I missunderstod your meaning.

 

The vast majority of O2 sensors out there are wideband which would work fine for your average grocery getter but arent precise enough to properly fine tune. The EFI systems, from my understanding, typically have suitable tolerances programmed in that keep your engine in a good mixture and allow for the variations it can produce. But its not the kind of thing you want to use for a precise, high performance tuning application like many of us have with our atvs. If you're going to make the extra effort to properly tune your bike by more than just feel and plug reading ts better to use EGTs instead of a wideband O2 sensor that can fluxuate between 11:1 and 15:1 in relatively stable air conditions.

The O2 sensors in the aftermarket FI systems seem to be have problems with staying the right range. KMS told us a while ago that they were working on a better sensor and setup for thier systems that would reduce the issues and not require constant remapping. Theoretically a system running of an O2 sensor should be able to handle a great deal of fluctuation in intake without remapping, but as most people who've had road bikes or EFI atvs know it really takes an aftermarket or oem programmer to properly perform even with minor modifications to the intake or exhaust.

Just what I've come acrossed and drawn from my experience and the words of others.

 

dont know about the particulars, but the new cars are running 'digital' sensors - a whole slug of wires and a cool price tag too, and the processors are gettine really fast.....so I guess we'll see. I must say I dont quite understand how the 700 mixes fuel and air without accounting for load, which is measured by o2 flow out the exhaust....We.ve been tuning cars since the early 70's with exhaust gas analyzers - if the rap doesnt analyze it's poop, how does the intake know what's going on? [img]i/expressions/face-icon-small-smile.gif[/img] even the newest Corvettes use 02 sensors, 4 or 5 of them now, i forget...