V8 tach into a V6 car?
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Supreme Member
iTrader: (5)
Joined: Jan 2001
Posts: 2,025
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From: Evansville,IN,USA
Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
V8 tach into a V6 car?
can i put a tach out of a V8 car in a V6. i know the V6 wont work a V8(car is v6 now a V8). does the tach go through the ECM? or is it independent like the gauges? if i can swap them out, how do i go about it? thanks. i posted earlier but no replies.
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Wide Open Till You See God...Then Brake
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Wide Open Till You See God...Then Brake
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
If a V8 drives a V6 tach, the tach will read 25% high. With a V8, there are 4 pulses per revolution of the crank from the ignition system, while a V6 outputs only 3 pulses per revolution.
Tim
Tim
Thread Starter
Supreme Member
iTrader: (5)
Joined: Jan 2001
Posts: 2,025
Likes: 1
From: Evansville,IN,USA
Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
is there anyway to change this so i can put the v8 tach in?
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Wide Open Till You See God...Then Brake
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Wide Open Till You See God...Then Brake
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
You could probably modify the tach circuit to recalibrate the frequency to voltage converter for a different number of cylinders, but I have never actually tried to do it. Probably easier to get a tach for a V6.
Tim
Tim
Supreme Member
Joined: Nov 2000
Posts: 1,069
Likes: 1
From: So. Cal, L.A.
Car: '88 Firebird Formula 350
Engine: Built 383 TPI
Transmission: Built 700r4
Axle/Gears: 9 bolt, 3.27:1 Posi
The tach has nothing to do with the ECM. It has a signal wire that goes to the distributor. You will need either an aftermarket, or a V6 tach to go with a V6 engine.
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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4
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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4
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