Thread: knock sensor
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John at J&S John at J&S is offline
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Join Date: Dec 2005
Posts: 147

The version for distributor ignition has a "magnetic pickup" output centered around ground, so it will trigger the Bosch CDI.

We used to sell to a Porsche tuner in the Daytona Beach area. He used only one sensor with good results. One of his customers describes the mountng location:
how do i safely monitor my motor?

Louie Ott is using two sensors wired in parallel on his 928. He measured the output on a scope using a spring loaded center punch on the block to produce a uniform knock signal. He found the second sensor reduces the signal by about 30%, but there is enough range on the sensitivity knob to make up for it.

He (Louie928) describes results in this thread on the efi101 forum:
EFI University Electronic Fuel Injection Tuning :: View topic - Det hearing system
Old 10-29-2009, 02:44 AM
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