tachometer

Spektrewing386 · 09-27-2008, 07:51 PM

ok i have a v6 camry tachometer (3vz) and mr2 turbo tachometer.

the 3vz tach doesnt quite fit into the combination meter. So I was going to swap the circuit boards on the back of the tachs. Thing is I dont know if they have exactly the same sweep increments.

How do you guys do it?

V6'er · 09-28-2008, 12:13 AM

So you look at the scale and the number of degrees of rotation from 1000 to 6000 (or any other similar reference) needs to be the same. If it's different, you can't use it without modification. And since a Turbo has a different redline, the scale is different.

MR2 Drifter · 09-28-2008, 12:31 AM

What he said^

On another matter... Spektrewing have you seen DRAMATIC LOOK GOPHER, that one cracks me up everytime I see it

Spektrewing386 · 09-28-2008, 12:32 AM

just because the redline is different doesnt mean the scale is different, its just the position of the "red line", trust me on that one.

Its hard to tell if the scale is the same, because the tick marks dont end at the edge of the gauge face material.
And if they arn't the same, what in the skadoop am I do to?

BTW you dont even have a v6... I need someone who has actually got a 3vz and a working accurate tachometer to answer me.

V6'er · 09-28-2008, 12:45 AM

The redline is different, and hence the scale is different. (It didn't have to be, but Toyota made them that way - more numbers at the top end.)

I've converted at least a dozen tachs which have been a mixed bag of N/A and Turbo units.

Spektrewing386 · 09-28-2008, 01:54 AM

sooooooooooooooooooooooooooooooooooooooooooooooo.. .................................................. ..

i have a turbo tach and a camry tach.

what do i do.

JDM Factory · 09-28-2008, 07:08 AM

I use the Camry tach and it works perfectly fine. It's a direct plug and play. My timing gun shows that it is accurate as well.

V6'er · 09-28-2008, 09:16 AM

Quote:

Originally Posted by Spektrewing386

sooooooooooooooooooooooooooooooooooooooooooooooo.. .................................................. ..

i have a turbo tach and a camry tach.

what do i do.

You ask somebody that has taken one apart and swapped the circuit boards if there are any "gotcha's". I've modified and calibrated stock tachs, and I used to manufacture a tach adapter, but I haven't swapped the board, which is pretty easy to do, but I'm not the expert on that.

Spektrewing386 · 09-28-2008, 10:13 AM

apparently I cant swap the board because the scale is off, but swapping it is easy.
apparently I cant just use the camry tach as is because it doesnt fit the hole in the dash whatsoever.

JDM Factory? how exactly was it "plug and play" because niether is the camry tach able to fit inside the dash hole correctly, nor is it able to plug directly into the back of the dash for signal pickup (the must be rotated 180 degrees for it to plug correctly into the back of the dash)

Do I need a N/A MR2 tachometer and swap the Camry board onto that? Will that make the scale correct?

Spektrewing386 · 09-28-2008, 11:31 AM

ok apparently im reading that I should desolder some stuff on the circuit board and put different stuff in. as in i should somehow solder a potietiometer (spelling) on the v6 circuit board since the correct resistors are already there. but i still must use n/a tach face?

JDM Factory · 09-28-2008, 11:56 AM

my car is an n/a and it just bolts right up perfectly and that's it. The scale read correct as well. It could possibly be different for the turbo combo gauge. I'll ask if anyone locally has a turbo gauge laying around and I'll play with it.

JDM Factory · 09-28-2008, 11:57 AM

My bro has a turbo, I'll take a look at his turbo face and mine and see if there is a difference.

JDM Factory · 09-28-2008, 12:11 PM

Okay i just took some pictures and yea they are different.

Turbo

N/a

Spektrewing386 · 09-28-2008, 12:46 PM

so you just put the camry circuit board onto the n/a gauge?

JDM Factory · 09-28-2008, 12:59 PM

yup and that's it

Spektrewing386 · 09-28-2008, 01:05 PM

is it verifed with an external tachometer or a freq generator?
im reading that that still makes it off a bit.

i guess the most accurate solution is to attach a 10k or 5k ohm 15-turn trim potentiometer
to the v6 circuit board (and leave teh resistors alone)

conor · 09-28-2008, 01:54 PM

Check out this sticky
How to calibrate Stock NA Tachometer for V6 Signal

Quote:

Originally Posted by Spektrewing386

BTW you dont even have a v6... I need someone who has actually got a 3vz and a working accurate tachometer to answer me.

I'm pretty sure that Mitch has had a running V6 MR2 for a few years now..

Spektrewing386 · 09-28-2008, 02:14 PM

i was talking about the other guy, MR2 Drifter

also, i dont have a n/a tach and im not paying $60 for a n/a gauge cluster if i dont have to.

i know the N/A tach face combined with the v6 board is fairly accurate as JDM Factory says so
and the 3vz tach goes from 0-8 just like the N/A face, so i wonder if theres truth to that.

i also wonder if thats not the case, where do i put the potentiometer on the 3vz tach board in order to show the sweep correctly.

V6'er · 09-28-2008, 02:31 PM

Another note here, as I understand it, the 3VZ still takes the Tach signal from the coil like the 3SGTE and 5SFE. This means that the voltage ranges are the same, so the only resistor value to change is the Gain resistor.

Most N/A tachs come in at about 3.9k for a gain resistor, so install a 5K pot to adjust it. (Better than a 10k, as it will give twice the resolution while turning the knob.)

If you really can't get it done by yourself, send me the tach and for $45 I'll calibrate it. (Yep, you save five bucks on a 3VZ calibration.

)

Spektrewing386 · 09-28-2008, 02:36 PM

Quote:

Originally Posted by V6'er

Most N/A tachs come in at about 3.9k for a gain resistor, so install a 5K pot to adjust it. (Better than a 10k, as it will give twice the resolution while turning the knob.)

i dont have a N/A tach, i have a turbo tach and a 3vz tach.

and with what im reading i cant put the 3vz board on the turbo tach face and have it accurate.

So either I have to extensivly modify the turbo board or mildly modify the 3vz board.

making the 3vz board suite the turbo face seems a lot easier than modifying the turbo board for 3vz signal and then its own face.

but how would i make the 3vz board suite the turbo tach face?

09-27-2008, 07:51 PM	#1 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	tachometer ok i have a v6 camry tachometer (3vz) and mr2 turbo tachometer. the 3vz tach doesnt quite fit into the combination meter. So I was going to swap the circuit boards on the back of the tachs. Thing is I dont know if they have exactly the same sweep increments. How do you guys do it?

09-28-2008, 01:05 PM	#16 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	is it verifed with an external tachometer or a freq generator? im reading that that still makes it off a bit. i guess the most accurate solution is to attach a 10k or 5k ohm 15-turn trim potentiometer to the v6 circuit board (and leave teh resistors alone) Last edited by Spektrewing386; 09-28-2008 at 01:48 PM.

09-28-2008, 12:13 AM	#2 (permalink)
V6'er All Torque, All the Time Join Date: Apr 2005 Location: Charlotte, NC Posts: 817 Thanks: 0 Thanked 19 Times in 13 Posts iTrader Rating: (1/100% )	So you look at the scale and the number of degrees of rotation from 1000 to 6000 (or any other similar reference) needs to be the same. If it's different, you can't use it without modification. And since a Turbo has a different redline, the scale is different.

09-28-2008, 12:31 AM	#3 (permalink)
MR2 Drifter No Drifting Skills Join Date: Jun 2008 Location: Chicago Posts: 503 Thanks: 3 Thanked 2 Times in 2 Posts iTrader Rating: (1/100% )	What he said^ On another matter... Spektrewing have you seen DRAMATIC LOOK GOPHER, that one cracks me up everytime I see it

09-28-2008, 12:32 AM	#4 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	just because the redline is different doesnt mean the scale is different, its just the position of the "red line", trust me on that one. Its hard to tell if the scale is the same, because the tick marks dont end at the edge of the gauge face material. And if they arn't the same, what in the skadoop am I do to? BTW you dont even have a v6... I need someone who has actually got a 3vz and a working accurate tachometer to answer me.

09-28-2008, 12:45 AM	#5 (permalink)
V6'er All Torque, All the Time Join Date: Apr 2005 Location: Charlotte, NC Posts: 817 Thanks: 0 Thanked 19 Times in 13 Posts iTrader Rating: (1/100% )	The redline is different, and hence the scale is different. (It didn't have to be, but Toyota made them that way - more numbers at the top end.) I've converted at least a dozen tachs which have been a mixed bag of N/A and Turbo units.

09-28-2008, 01:54 AM	#6 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	sooooooooooooooooooooooooooooooooooooooooooooooo.. .................................................. .. i have a turbo tach and a camry tach. what do i do.

09-28-2008, 07:08 AM	#7 (permalink)
JDM Factory My 3vz can eat a ct26 Join Date: Mar 2008 Location: Texas Posts: 113 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (3/100% )	I use the Camry tach and it works perfectly fine. It's a direct plug and play. My timing gun shows that it is accurate as well.

09-28-2008, 10:13 AM	#9 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	apparently I cant swap the board because the scale is off, but swapping it is easy. apparently I cant just use the camry tach as is because it doesnt fit the hole in the dash whatsoever. JDM Factory? how exactly was it "plug and play" because niether is the camry tach able to fit inside the dash hole correctly, nor is it able to plug directly into the back of the dash for signal pickup (the must be rotated 180 degrees for it to plug correctly into the back of the dash) Do I need a N/A MR2 tachometer and swap the Camry board onto that? Will that make the scale correct?

09-28-2008, 11:31 AM	#10 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	ok apparently im reading that I should desolder some stuff on the circuit board and put different stuff in. as in i should somehow solder a potietiometer (spelling) on the v6 circuit board since the correct resistors are already there. but i still must use n/a tach face?

09-28-2008, 11:56 AM	#11 (permalink)
JDM Factory My 3vz can eat a ct26 Join Date: Mar 2008 Location: Texas Posts: 113 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (3/100% )	my car is an n/a and it just bolts right up perfectly and that's it. The scale read correct as well. It could possibly be different for the turbo combo gauge. I'll ask if anyone locally has a turbo gauge laying around and I'll play with it.

09-28-2008, 11:57 AM	#12 (permalink)
JDM Factory My 3vz can eat a ct26 Join Date: Mar 2008 Location: Texas Posts: 113 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (3/100% )	My bro has a turbo, I'll take a look at his turbo face and mine and see if there is a difference.

09-28-2008, 12:11 PM	#13 (permalink)
JDM Factory My 3vz can eat a ct26 Join Date: Mar 2008 Location: Texas Posts: 113 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (3/100% )	Okay i just took some pictures and yea they are different. Turbo N/a

09-28-2008, 12:46 PM	#14 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	so you just put the camry circuit board onto the n/a gauge?

09-28-2008, 12:59 PM	#15 (permalink)
JDM Factory My 3vz can eat a ct26 Join Date: Mar 2008 Location: Texas Posts: 113 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (3/100% )	yup and that's it

09-28-2008, 02:14 PM	#18 (permalink)
Spektrewing386 Cage Fighter Join Date: Sep 2005 Posts: 687 Thanks: 10 Thanked 27 Times in 25 Posts My Google Map iTrader Rating: (1/100% )	i was talking about the other guy, MR2 Drifter also, i dont have a n/a tach and im not paying $60 for a n/a gauge cluster if i dont have to. i know the N/A tach face combined with the v6 board is fairly accurate as JDM Factory says so and the 3vz tach goes from 0-8 just like the N/A face, so i wonder if theres truth to that. i also wonder if thats not the case, where do i put the potentiometer on the 3vz tach board in order to show the sweep correctly.

09-28-2008, 02:31 PM	#19 (permalink)
V6'er All Torque, All the Time Join Date: Apr 2005 Location: Charlotte, NC Posts: 817 Thanks: 0 Thanked 19 Times in 13 Posts iTrader Rating: (1/100% )	Another note here, as I understand it, the 3VZ still takes the Tach signal from the coil like the 3SGTE and 5SFE. This means that the voltage ranges are the same, so the only resistor value to change is the Gain resistor. Most N/A tachs come in at about 3.9k for a gain resistor, so install a 5K pot to adjust it. (Better than a 10k, as it will give twice the resolution while turning the knob.) If you really can't get it done by yourself, send me the tach and for $45 I'll calibrate it. (Yep, you save five bucks on a 3VZ calibration. )