V6 to V8 tach fix please!!!
#1
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Join Date: Jun 2003
Location: Nova Scotia
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Car: 1986 trans am
Engine: 300hp 355cu. inch
Transmission: 350 turbo with shift kit and ratchet shifter
V6 to V8 tach fix please!!!
I bought an 86 firebird with a 350 engine but was originaly a V6 car. I need a way to calibrate my tach so it will read even close to what it should. I have read they can do it with the s-truck engine swap but I can't find facts. The car has a really nice guage package so I would like to keep it. Thanks.
#3
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My brother has recalibrated tachs to work with V8s that never had them- even a weirdo rotatry engine tach in an RX-7 that got a V8 transplant. It's basically at it's heart a change of a single resistor inside the tach. Knowing which one and how much to change it, though, is the real trick. I guess being an electrical engineer like he is helps.
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Car: 89 base 'Bird
Engine: 507ci Caddy
Transmission: BOP TH400
If you look at some of the Toyota truck 4x4 sites they swap in 4.3's and 350's in em and what they do is wire a pot onto the motor of the tach. Then you adjust it to read correctly by hooking up a multimeter to the engine or using another tach. Do a search for it on google and you should find it. I've did it to my cluster but I havn't gotten a chance to try it(no engine in car ) If I remember right the pot was either a 10k or 5k ohm linear taper. I got it from radio shack.
#5
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Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating
Originally posted by Damon
My brother has recalibrated tachs to work with V8s that never had them- even a weirdo rotatry engine tach in an RX-7 that got a V8 transplant.
My brother has recalibrated tachs to work with V8s that never had them- even a weirdo rotatry engine tach in an RX-7 that got a V8 transplant.
thats it
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