Stock tach =good reading?

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Mar 1, 2004

#1

• Mar 1, 2004

• #1

Is the stock tach give a good reading ?

 

FiveOhhStang

New Member

Jan 27, 2003

299

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Sanger, Cali.

Mar 1, 2004

#2

• Mar 1, 2004

• #2

Honestly No, that is if your racing, for street driving itll do. I heard the can be off anywhere from 100 - 600 rpms. I added one to my GT recently(aftermarket) and the stock Tach was 100 rpm's off.
-Nick

 

89LXstang

Founding Member

Aug 31, 2001

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Fresno,CA

Mar 1, 2004

#3

• Mar 1, 2004

• #3

bock said:

Is the stock tach give a good reading ?

Click to expand...

give or take a few hundred revs

 

S

StreetStang37

Founding Member

Apr 23, 2001

451

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San Jose, CA

Mar 1, 2004

#4

• Mar 1, 2004

• #4

mine is pretty much dead on (within 50-100 rpm @ 6200-6250) with my autometer but is off by about 100 rpm (too low) at idle.

 

mr.nitrous

New Member

Dec 13, 2003

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Southern California

Mar 1, 2004

#5

• Mar 1, 2004

• #5

my stock tach was off by 100rpm at idle and progressivly got worse as the rpm increased. at 5500 rpm my stock tach was reading 5800rpm. They suck, replace it.

 

Black 93 Fox

Active Member

Jun 1, 2003

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Vancouver,Washington

Mar 1, 2004

#6

• Mar 1, 2004

• #6

No....Everyone has told me they are either high or low on RPM's.

Black 93 Fox

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Mar 3, 2004

#7

• Mar 3, 2004

• #7

i dontwant to use a ATM tach... maybe just a shift light?

i wanna use the msd or the autometer with the pins... it should work...

if i use a 6200 pin even if the stock tack is wrong,the shift light shoulb get on at 6200?

witch one to do sugest? msd or atm?

 

axeman

Founding Member

Feb 9, 2001

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36

Elizabethtown, PA

Mar 3, 2004

#8

• Mar 3, 2004

• #8

if i use a 6200 pin even if the stock tack is wrong,the shift light shoulb get on at 6200?

Click to expand...

i'd like to know too, i have good reason to believe my tach is off.

 

87TTopGT

New Member

Dec 21, 2003

173

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0

Mar 3, 2004

#9

• Mar 3, 2004

• #9

Just installed an Autometer, the stock tach is off by 200 RPM. The shift light only option should be accurate, I'm guessing it hooks to the coil wire just like an aftermarket tach.

 

M

motrV8ed

New Member

Dec 8, 2001

31

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Hampton, VA

Mar 3, 2004

#10

• Mar 3, 2004

• #10

when I cruise at around 45 in 4th my stock tach reads 200 rpm or so lower than my autometer. I trust the autometer more than the stock tach!

 

SuperStang83

Founding Member

Mar 21, 2001

1,693

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49

Boyertown, Pa

Mar 3, 2004

#11

• Mar 3, 2004

• #11

My buddy with an 88LX's stock tach reads about 1k rpm high! I'm not exactly sure how much my car is off yet, but I'm sure it's a lot!

Jakob

 

TheFleshRocket

Founding Member

Jul 10, 2002

208

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16

Southern Ill Annoy

Mar 3, 2004

#12

• Mar 3, 2004

• #12

Well, the rev limiter is supposed to kick in at 6250rpm. So, if you run the motor up to the rev limiter and see where that is on the tach, that will give you some idea of its accuracy at high revs.

At least I think that'll work. Anyone else care to comment?

 

JadeFalcon

Founding Member

Mar 28, 2002

1,924

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Arlington, TX

Mar 4, 2004

#13

• Mar 4, 2004

• #13

it is inaccurate, and the worst things, its inaccuracy is random, some tachs show 100 off, some 1000 off, and you never know.

 

S

StreetStang37

Founding Member

Apr 23, 2001

451

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0

San Jose, CA

Mar 4, 2004

#14

• Mar 4, 2004

• #14

I wouldnt rev it to the fuel cut off knowingly. Either get a shift light/tach or pray your is accurate.

 

Greenracing

Founding Member

Nov 13, 2000

109

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Puerto Rico

Mar 4, 2004

#15

• Mar 4, 2004

• #15

they are never accurate, get an Autometer, you gonna love it.

 

Scott W

Founding Member

May 27, 2000

1,768

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37

Toronto, Ontario

Mar 4, 2004

#16

• Mar 4, 2004

• #16

I used my msd 6al to test my tach. I put the 3000rpm pill in, and the car's tach read dead-on (3000rpm), when the rev limiter cut in.

I then tested the 6000 rpm pill, and my tach read 6500rpm before the rev limiter kicked in, so my tach is off my 500 rpm @ 6000 rpm. If I had more pills I could do a better job calibrating.

 

Blandnuts

I don't swallow; I only swoosh

Founding Member

Aug 21, 2000

1,172

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124

FloorDuh

Mar 5, 2004

#17

• Mar 5, 2004

• #17

Scott W said:

I used my msd 6al to test my tach. I put the 3000rpm pill in, and the car's tach read dead-on (3000rpm), when the rev limiter cut in.

I then tested the 6000 rpm pill, and my tach read 6500rpm before the rev limiter kicked in, so my tach is off my 500 rpm @ 6000 rpm. If I had more pills I could do a better job calibrating.

Click to expand...

I did the same test and came up with the same results .

 

91five-o

New Member

Nov 16, 2002

287

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0

Maple Ridge British Columbia

Mar 5, 2004

#18

• Mar 5, 2004

• #18

At idle my stock tach is accurate. It gets progressively worse (reads high) as the rpms go up. No wonder I kept bogging off the line with my ET Streets. Just wait 'till this year !

Rick

 

Maryland Stang

Active Member

Aug 21, 2002

1,656

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39

Greenville, NC

Mar 5, 2004

#19

• Mar 5, 2004

• #19

I'm not trying to start an argument here but what difference does it make whether the tach is off or not? I mean as long as the tach is consistant isn't that what is really important?

For example 91five-o wrote:

At idle my stock tach is accurate. It gets progressively worse (reads high) as the rpms go up. No wonder I kept bogging off the line with my ET Streets.

If your stock tach reads 2,000 and you're bogging at launch why didn't you just raise your RPM to 2,500 or 3,000 when you launch? What did the stock tach's inaccuracy have to do with your launches?

Of if you know that your engine looses steam at 5,000 RPM on the stock tach what difference will it make if a 200 dollar tach says the engine is loosing steam at 5150 RPM? It's still gonna loose steam at the same actual engine RPM.

Now if you're constantly switching between exactly prepared cars like IROC racers I can see the importance of having exactly calibrated tachs but if you're only driving one car than I think the consistancy of the tach is much more important than the accuracy.

 

-86GTStang

Member

Dec 27, 2003

165

0

16

Norway, Scandinavia

Mar 5, 2004

#20

• Mar 5, 2004

• #20

Corect readings...

..Interesting, BUT are those aftermarket meters calibrated ???
The stock one is not the best, but dont go blind on Autometer or other brands readings. The best way to control this, is using a rpm instrument thats calibrated and relyable. A stroboscope instrument !
( I use this type of instruments sometimes, and you just mount a strip of reflektive tape to the rotating part, and do a wireless reading. Correct reading, but its a quality instrument ! $428 !! ) ....