Not worth reading

[cschannuth]

Tachs were an ala carte option years ago. Most didn’t have the sense to check the box when ordering back in the day.

 

[Dirtman]

I'm sorry if you are reading this. Just a quick rant as I did not see a spot for "general rants"
I don't understand why I have a manual transmission and NO TACHOMETER!!! Every vehicle needs a tach,here I am driving a manual and no tach. I have 4 vehicles,3 are automatic and all 3 have a tach!!!!
That is all. Carry on my good men.

If you need a tach to tell you when to shift you should stop driving immediately.

 

[Fryedbm]

If you need a tach to tell you when to shift you should stop driving immediately.

Wow bro. Rude

 

[Dirtman]

Wow bro. Rude

It was said with love.

 

[Fryedbm]

It was said with love.

I don't NEED it per say..I just think the more I can see going on with my vehicle the better off I am. I don't even like idiot lights. I would rather have a guage/meter for everything. Lol. I watch the tach in my autos every time I start it as well as when I am driving. The more I know come diagnosis time(when problems arise) the easier it is to pinpoint and fix. Does that make sense?

 

[Dirtman]

I don't NEED it per say..I just think the more I can see going on with my vehicle the better off I am. I don't even like idiot lights. I would rather have a guage/meter for everything. Lol. I watch the tach in my autos every time I start it as well as when I am driving. The more I know come diagnosis time(when problems arise) the easier it is to pinpoint and fix. Does that make sense?

My automatic has a tach and that's about all it's useful for, checking to see if it's idling right. Occasionally it's useful to check to see when the torque converter locks.

 

[Fryedbm]

My automatic has a tach and that's about all it's useful for, checking to see if it's idling right. Occasionally it's useful to check to see when the torque converter locks.

What does that mean. "When the torque converter locks"

 

[racsan]

my 94 didnt have a factory tach and 2 aftermarket tachs didnt work so I ended up buying a tach meant for a diesel, you clamp a sensor to the alternator case then calibrate it , for calibration I bought a infrared hand held $20 item that uses a piece of reflective tape on the crank dampner. I mainly wanted a tach to see what my rpms were since I tossed a 3.45 rear axle in favor of a 4.10 ratio.

 

[19Walt93]

In the TFI days it was a helpful diag tool if the vehicle had a tach- if the driver looked at it. If the tach immediately dropped to zero when the vehicle quit, it was an ignition problem, if it continued to read as they coasted to a stop it was usually a fuel problem. The key phrase is "if the driver looked at it". If it did it once then restarted I could warn them what to look for the next time so we could locate the problem.

 

[sgtsandman]

What does that mean. "When the torque converter locks"

It locks to prevent slip at highway speeds for better efficiency. If I remember correctly, it literally locks and the RPM will drop some. I forget what the mechanism is for it to do that. I'm sure there is a bunch of videos on the subject.

 

[Dirtman]

What does that mean. "When the torque converter locks"

Torque converters have a clutch inside them that locks up solid so the engine and transmission are directly linked. When the clutch locks up the RPMs drop.

 

[RonD]

The torque converter is a "fluid coupler"
Very simplified, think of one fan facing another fan, if you turn on one fan the air flow will cause the other fan blade to turn, but only if air flow is high enough from the powered fan

The Engine powers the one fan, other fan is connected to transmission input shaft inside the torque converter
When you stop you don't have to take the transmission out of gear because at idle RPMs engine is not "spinning it's fan" fast enough to FORCE the transmission fan blades to spin

As you increase engine RPMs fan spins faster and so transmission fan spins faster, and you start to go/move

But.....................this is a poor way to transfer energy, direct drive, like a manual transmission has, is way more efficient
So torque converters will "lock" both fans together for direct drive at some point, but that point is tricky because it makes changing ratios(gears) in an automatic harsh, not smooth, because its direct drive, like shifting gears in a manual without the clutch, and without RPM matching, lol

So the very first transmission solenoid that was added to vehicles when they had to get computers for Fuel Injection(EFI) was the TCC solenoid, torque converter clutch solenoid
TCC locks and unlocks the "fans" based on speed, engine RPMs and "ratio", and it can unlock to "shift gears" so smooth shifting and then lock again

This drastically improved MPG in automatics, 15MPG jumped to 18MPG because less fan on fan transfer of energy, direct drive was possible much sooner, and could be turned on and off based on driving conditions as computer sees it

 

[lil_Blue_Ford]

I agree on not needing a tach in a manual. But it’s nice to have, especially in a manual

 

[Fryedbm]

Torque converters have a clutch inside them that locks up solid so the engine and transmission are directly linked. When the clutch locks up the RPMs drop.

Ty

 

[Fryedbm]

The torque converter is a "fluid coupler"
Very simplified, think of one fan facing another fan, if you turn on one fan the air flow will cause the other fan blade to turn, but only if air flow is high enough from the powered fan

The Engine powers the one fan, other fan is connected to transmission input shaft inside the torque converter
When you stop you don't have to take the transmission out of gear because at idle RPMs engine is not "spinning it's fan" fast enough to FORCE the transmission fan blades to spin

As you increase engine RPMs fan spins faster and so transmission fan spins faster, and you start to go/move

But.....................this is a poor way to transfer energy, direct drive, like a manual transmission has, is way more efficient
So torque converters will "lock" both fans together for direct drive at some point, but that point is tricky because it makes changing ratios(gears) in an automatic harsh, not smooth, because its direct drive, like shifting gears in a manual without the clutch, and without RPM matching, lol

So the very first transmission solenoid that was added to vehicles when they had to get computers for Fuel Injection(EFI) was the TCC solenoid, torque converter clutch solenoid
TCC locks and unlocks the "fans" based on speed, engine RPMs and "ratio", and it can unlock to "shift gears" so smooth shifting and then lock again

This drastically improved MPG in automatics, 15MPG jumped to 18MPG because less fan on fan transfer of energy, direct drive was possible much sooner, and could be turned on and off based on driving conditions as computer sees it

Wow. Ty!!