Display current gear without clutch engaged?

[TEWwild]

Turned it on this morning, disappointed, seems useless the way it is setup.

[WolfsFang]

Originally Posted by LeeMaster

And then it brings us back to the question, how can the R indicator be shown on idle when the engine speed and wheel speed is at zero.

there us a sensor for the reverse gear

Originally Posted by boead

What's the (arrow up?) light blinking to the right indicating?

When to shift for the best fuel economy

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[Captain_Awesome_Pants]

Originally Posted by Carbon420

How do you see your gear? I've played with all the buttons. Or so I thought.


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Like others said, its in the manual I believe. But a quick google search yielded this: http://www.ft86club.com/forums/showp...7&postcount=11

[LeeMaster]

Originally Posted by ft_sjo

Read post #25.

And then it brings us back to the question, why didnt they include sensors for all 6 gears.

[supramkivtt2jz]

Originally Posted by WolfsFang

When to shift for the best fuel economy

i doubt that. try driving in a parking lot in 4th at 1500 rpm. itll give you the arrow. upshifting means the car will be in 1200 rpm or less. i doubt a coughing and choking engine will result in "best" fuel economy

[WolfsFang]

Originally Posted by supramkivtt2jz

i doubt that. try driving in a parking lot in 4th at 1500 rpm. itll give you the arrow. upshifting means the car will be in 1200 rpm or less. i doubt a coughing and choking engine will result in "best" fuel economy

if your on a flat road then it is no problem being at that rpm. The arrow is very misleading and should only be taken with a grain of salt.

[Calidrifter]

Originally Posted by LeeMaster

And then it brings us back to the question, why didnt they include sensors for all 6 gears.

Most likely cost efficiency. Reverse has a built in sensor in that it can be done based off of the reverse lights. Shift into reverse lights and sensof go on.

If you guys really wanted to know what gear you are in all of the time you should have just gotten an A/T

[cfusionpm]

Originally Posted by Calidrifter

Most likely cost efficiency. Reverse has a built in sensor in that it can be done based off of the reverse lights. Shift into reverse lights and sensof go on.

If you guys really wanted to know what gear you are in all of the time you should have just gotten an A/T

It's not really a necessity, just something nice to know. Toyota took the effort to include the display in the first place, so it's frustrating to see it completely nerfed. Why even show it? Why not just have some green eco light flash like the redline shift light?

[Calidrifter]

Hmm maybe it was just something they put in so it wouldnt differ too much from the auto version. Bit yeah I get where you guys are coming from in regards to why not just add this little bit.

Perhaps this is one of those things they will add during the mid model refresh.

[SkullWorks]

pherhaps it is so that when you datalog all the can bus channels thru the obd2 port you have data correlating to what gear you are in, im sorry that Toyota making more info available to you is so upsetting to you all...that's probably how we all got stuck with gauges that have big dead zones because most drivers are incapable of dealing with data.

My race car has gear position derived from, VSS vs engine RPM, works great.

Someone mentioned the 370Z having auto blip...and somehow thinks that means we should have the same capability for reading gear before clutch is out....well sadly that is very far from reality, that system is fairly involved and adds an entire new level of sensor input...it tracks the actual gear selector (shifter) movement to make predictions of the gear you are about to select.

I believe the Auto blip on the twins is derived from assumed gear choice based on acceleration vs deceleration, RPM and wheel speed may be other considerations, you can make lots of good assumptions based on the data a car is already collecting...IE if you are hard on the brakes, off the gas and the rpm is dropping before you depress the clutch, chances are you are about to downshift. if you are flat footed and aproaching redline when the clutch goes in a likely choice is for you to select a higher gear...right?

not as mysterious as some of you would like to believe...

[WolfsFang]

Originally Posted by SkullWorks

I believe the Auto blip on the twins is derived from assumed gear choice based on acceleration vs deceleration, RPM and wheel speed may be other considerations, you can make lots of good assumptions based on the data a car is already collecting.

There is no auto blip on the manual twins, and the auto blip on the auto is a different subject then what we are talking about.


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[njccmd2002]

Originally Posted by WolfsFang

Or you could just leave the feature off and ignore this thread, instead you decided to post this very useless post.

oh thanks, much thanks. did not realize that. you sir are the bomb. :part y0030:

[coastertrav]

I'm not sure why this discussion is lasting so long.

The gear indicator is driven from the vehicle speed sensor and engine rpm. The ecu looks at each and calculates what gear to display. I don't know why some of you think this is the more complicated way of doing things because it is essentially free to Toyota to implement.

Getting the gear indicator from a sensor in an H-pattern transmission is difficult and costly to say the least due to the way the forks shift around in the transmission and that you would need at least three sensors to know the current gear all the time (sensing the location of each gear selector in the transmission), and if any one of these sensors failed you would lose your nice gear readout.

Motorcycles usually (but not always, some calculate gear just like the FRS) have a sensor to detect their actual gear, but they also have a completely different transmission. Motorcycles can get away with this because they have a sequential transmission and the gear selector is a barrel that increments between 30 and 50 degrees with each shift and can easily be monitored with a rotary potentiometer.

Source: I've done my fair share of engine management and datalogger installs on cars and motorcycles.

TL;DR
FRS uses math to calculate gear, sensors are expensive and can fail, bikes are a whole different story.

[CaptainSlow]

Originally Posted by ft_sjo

It's not possible. The ECU uses engine speed and wheel speed to determine what gear is engaged. It can't do that with the engine disconnected from the drive train.

Came here to say this. Works the same way as the aftermarket gear indicators for sport bikes, which connect to the speedometer and RPM signal wires, and have to be programmed before you can use them so they know the ratios for each gear. It just does a simple calculation of wheel speed and RPM to figure out the ratio...by the ratio, it knows what gear you are in and displays it. Same thing with MPG...there is no sensor that reads fuel mileage...it calculates it based on other PIDs.

The reason it can't show the gear with the clutch disengaged is because it doesn't have part of the equation. It has RPM (car is still running), but there is no wheel speed. So, you either get a ratio of zero (which doesn't match with any gear in its programming) or a Div/0 situation. Just can't happen.