GREEN RPM wire afc?

[87SIA20A3T]

which wire in the harness is the wire to the tach? I looked up all the wires in the harness and have not found the tach wire. Should I just run a wire from the - side of the coil?

[A18A]

i think so (the blue one)

[87SIA20A3T]

solid blue?

[Vector]

solid blue, you will see it on one of the coil plugs.

[Rendon LX-i]

which wire in the harness is the wire to the tach? I looked up all the wires in the harness and have not found the tach wire. Should I just run a wire from the - side of the coil?

I just ran a wire to my afc from coil.

[87SIA20A3T]

so, I ran it to the wire in the harness and I do not get a tach reading in my display. It moves sometimes, could this just be a shitty connection or am i suspose to do something in the afc?

[89T]

http://img529.imageshack.us/img529/4690/safc1bv2.jpg (http://imageshack.us)
http://www.3geez.com/forum/showpost.php?p=715836&postcount=1
http://img529.imageshack.us/img529/safc1bv2.jpg/1/w903.png (http://g.imageshack.us/img529/safc1bv2.jpg/1/)

[89T]

your starting to worry me with all these questions.

are you sure you can do the hard stuff?

[87SIA20A3T]

lol yeah, I'm just scared of hacking up my wire harness

[89T]

just soldier everything and use heat shrink. there is no fun in trouble shooting electrical connections.
good luck with the mechanical portion of the build.
if you get a map sensor cel throw in a "y" splice on the vacuum line just before the map sensor with a check valve. it needs to vent to the atmosphere.

[MessyHonda]

blue wire i get my tach read out from my msd box

[89T]

all wiring in the above illustration is at the ecu after all color changes in the harness.
you can tap the side of the box. though i am not sure the btm he is using has a tach connection.
besides its cleaner and easier to tap everything under the seat.

[87SIA20A3T]

i just ran it from the - side of the coil. Everything works fine, just the tach jumps around. I did the double ground(1cm apart on the same wire, brown towards ecu) and double power. I need to play with it more....

[Rendon LX-i]

My Autometer tach jumped around once in awhile but my dizzy wasnt never bad so idk....I just used the (-) on the coil and your set man....89accord gave you a pretty good decrib of how it should go on th map and ground and power wires

[89T]

i wounder if you guy's need a tach adaptor...

[87SIA20A3T]

yeah, the tach on the afc actualy jumps around when the engine is under load, but correct at idle...this actualy just baffles me. Anyone?

[87SIA20A3T]

tach adapter? does that have to do with a ballast resistor or are you pulling my leg lol

[lostforawhile]

just wanted to add something, you can access the tach wire right next to the HVAC blower, if you don't want to mess with the cluster, it goes into the AC delay module, that module has a built in safety limiter for the AC compressor, it cuts power to the clutch if the rpm's are too high, so the same wire is there that feeds the tach in the dash. the factory coil also has a built in 2.2 K resistor, everything that runs off of the tach signal in the car is in line with that resistor.

[Rendon LX-i]

Nice lost great info I say a lil memo should be put in a sticky. People like us that are wired tucked this would make a cleaner install

[A18A]

interesting. i didn't know the a/c had a rpm cut off point

[lostforawhile]

interesting. i didn't know the a/c had a rpm cut off point
yea the rpm limit of the compressor is lower then the redline of the engine, the box that delays the compressor start also has the rev limiter built in

[89T]

just do it at the ecu. tdc wire.

[lostforawhile]

just do it at the ecu. tdc wire.
yep, another place to tie in to it, on both carb and FI cars