tapping into the tach to control accessories
04-09-02, 04:26 PM
#1
tapping into the tach to control accessories
As you know, the AC doesn't work with the Apexi pFC in certain vehicles so Chuck Westbrook came up with a bypass by connecting two pins of the harness together. Unfortunately, the AC is always on if the A/C switch and the fan switch in the dash are on. Chuck went with a pressure sensitive switch to turn off the AC under boost.
I'm leery of having a boost leak at 7500 rpm and possibly ruining the AC compressor. My solution is to regulate the AC with engine speed.
I bought an rpm switch from racerpartswholesale.com for $50.00.
The switch is designed to turn a light on at a selected rpm. I plan to have Chuck Westbrook AC fix normally on with the rpm switch disconnecting the connection whenever the rpm exceeds 4000rpm with a relay.
My question is: Is there a pin in the computer harness that will let me tap into an rpm signal for this switch?
Has anyone tapped into the rpm switch to control other functions?
I'm leery of having a boost leak at 7500 rpm and possibly ruining the AC compressor. My solution is to regulate the AC with engine speed.
I bought an rpm switch from racerpartswholesale.com for $50.00.
The switch is designed to turn a light on at a selected rpm. I plan to have Chuck Westbrook AC fix normally on with the rpm switch disconnecting the connection whenever the rpm exceeds 4000rpm with a relay.
My question is: Is there a pin in the computer harness that will let me tap into an rpm signal for this switch?
Has anyone tapped into the rpm switch to control other functions?
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