V6 tach or V8 tach
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Car: 1987 IROC-Z Z28 Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.23
V6 tach or V8 tach
Is it true a tachometer can be specific for a V6 or V8? Is there a way to change the setting to make it work?
Joined: Jan 2008
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From: Tallahassee, Fl
Car: 84 z28 h.o./ 92 rs
Engine: 305 h/o /3.1 v6
Transmission: hybird turbo 350/t5 bog warner
Axle/Gears: non posi 3.73 / ls 3.42
Re: V6 tach or V8 tach
i know on my 84 z28 i was but on my 92 rs it is ! so yes and no !
just take you tach off and look for a switch that says v6 v8 on the back of the tach !
good luck !
just take you tach off and look for a switch that says v6 v8 on the back of the tach !
good luck !
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Joined: Nov 2009
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From: PA
Car: 1985 trans am
Engine: 1969 chevy 350 .060 over
Transmission: 5spd
Re: V6 tach or V8 tach
i would think theres no difference, like a tachometer just measures rpm. 5000 rpm is 5000 rpm, shouldnt matter if its a v6 or a v8
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Joined: Nov 2009
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From: Angola, NY
Car: 1982 Trans Am
Engine: LG4
Transmission: Auto
Re: V6 tach or V8 tach
for aftermarket it depends. i had a sunpro tach (cheap$30) that i bought once and it had a switch in the back for 4, 6 or 8 cyl. for stock, i wouldn't think so. the v6 i think gets the signal from the icm and the v8 gets it from the distributor.
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From: N. Virginia
Car: 1988 Firebird - 1998 Z28
Engine: 2.8 - LS1
Re: V6 tach or V8 tach
There is a difference. I can't explain why, but i tested mine and there was a couple hundred Rpm difference in between settings.
Besides, If you have a v8, get a v8 tach. Doesn't that just make sense?
Besides, If you have a v8, get a v8 tach. Doesn't that just make sense?
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Tach This !
Originally Posted by Sandslot;
Is there a way to change the setting to make it work?
A tach lets you know the RPM VIA counting pulses from the ignition system.
An 8 cylinder engine produces 4 pulses per revolution.
A 6 cylinder engine produces 3 pulses per revolution.
A 4 cylinder engine produces 2 pulses per revolution.
Your problem can be remedied in the circuit inside the dash that moves the pointer.
It’s contained on a small plug-in PCB or integrated in the main board.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder one side of the potentiometer, measure it and buy the matching resistor.
Originally Posted by sablemaniac;
the V6 i think gets the signal from the icm and the v8 gets it from the distributor.
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