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knock sensor
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10-08-2010, 12:04 PM
Post: #1
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knock sensor
I have recently fitted a late smallport engine to my Zenki '86 I am currently using the early ecu, injectors and wiring.
I would like to use a Freedom ecu when I change the cams etc and I would like to use the knock sensor to help control the ecu. Can anyone please tell me where the wires from the knock sensor go to and the spec. of the wire to use and should it be shielded ? Thanks tc An analogue brain in a digital World |
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10-08-2010, 05:03 PM
Post: #2
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knock sensor
I believe most knock sensors need a single shielded wire.
FABRICA MI DIEM, PVNC! |
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10-08-2010, 10:47 PM
Post: #3
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knock sensor
OEM smallport knock sensor has a two-pin plug. One wire uses the shield
and connects to an ECU sensor ground (not a chassis ground). The other uses the core of the cable and connects to the KNK input. Cheers... jondee86 |
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10-09-2010, 11:42 AM
Post: #4
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knock sensor
excellent thankyou guys, all I need to do now is identify the sensor pin on the ecu. The pins are not marked inside like the oem ecu.
Could I also use a wideband in narrowband mode to control afr ? An analogue brain in a digital World |
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10-09-2010, 11:55 AM
Post: #5
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knock sensor
In theory you should be able to do that..but not all wideband emulators play nice with all ecu's.. only one way to find out though.
A wheel to steer the front of the car A pedal to steer the rear |
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10-09-2010, 12:20 PM
Post: #6
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knock sensor
it kind of mystifies me how the narrowband simulator works to be honest. If the wideband sees an afr of say 11.2 how does this appear in simulated narrowband at the ecu ? Or does it work the other way around where you set the target afr of say 12.5 and the simulator sends this to the ecu ?
An analogue brain in a digital World |
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10-09-2010, 05:29 PM
Post: #7
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knock sensor
No, narrowband signal is more like an on/off switch. You don't get to specify an lambda targets with those. It just helps the ecu reach stoich during cruising. Simulation mode reduces the wideband signal to the on/off characteristic
A wheel to steer the front of the car A pedal to steer the rear |
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10-10-2010, 07:48 AM
Post: #8
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knock sensor
Most OEM narrow band O2 sensors "switch" at 0.45V to indicate a change
from rich to lean. That is 0.45V = AFR14.7 ot Lambda 1. The wide band controller synthesises an output that "switches" at the same 0.45V value by creating a steeply rising output at Lambda 1. The factory ECU is quite happy with this, as it only needs to know if the AFR is rich or lean. It maintains an average AFR by constantly enriching and enleaning the fuel by a very small amount. Kind of a cool trick, and said to be good for the catalytic converter. Cheers... jondee86 |
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