MIKE_RX7

Hi Guys ,
I have installed 2 Bosch Donut Knock Sensor to my 13B one for each housing.
My ECU is series 7/8 LINK G4+ so is there anyone with experience to advice me about the pinout connection to my plug and play Link G4+?
The Bosch type donut connection are 2 wire sensors with sig- and sig+ pins.
Any advice will be helpful
thanks

Howard Coleman

iTrader: (6)

maybe i can help... i have a wire in. i doubt if you have the same "A" and "B" plugs. i started with a ViPEC V88 and transitioned to a G4X which is similar wiring-wise to the G4...

my ECU has input ports for two Bosch new style (like yours) knock sensors. both wires are solid blue. perhaps you need the additional harness... or not.

Link has a wonderful forum, you always get help promptly whether it be from Link staff or the community

https://forums.linkecu.com/forum/16-g4/

good luck.... always loving my Link

twinturborx7pete

iTrader: (3)

So the Bosch style knock sensors require a 2 wire shielded setup.

For each knock sensor you would wire it as follows:

Sig + would run to Knock Sensor Input at ECU
Sig - would run to Sensor Ground at ECU (would require a splice)
Shield runs to Sensor Ground at ECU (would require a splice)

DO NOT connect the shielded part of the cable at the knock sensor. It should be cut away and insulated.

However, for what it is worth... knock sensors are pretty worthless on a rotary. By the time you have detonation picked up on a rotary, there is a good chance the damage is done.

Howard Coleman

iTrader: (6)

"knock sensors are pretty worthless on a rotary."

wrong on two counts and i speak from experience.

knock readings are generated by the newer Bosch sensors continuously. there are many conditions that can create elevated but not fatal knock levels. if you monitor or log them you may be able to lower the level.

should you get into a serious knock level, the previous poster is correct, YOU won't be able to make an adjustment in time. however the ecu can and will. for instance i was at 4600 rpm in 4th gear at 24 psi and my fuel pump disconnected from the hardpipe. elevated knock triggered zero timing and there was zero engine damage. the key as to knock protection is that it has to be a timing response as it is close to instantaneous.

MIKE_RX7

I ask the LINK community days ago and still haven't got an answer. Any one knows how to connect and monitor dual bosch donut sensors directly to the ecu pinout factory plug or auxiliary inputs without the use of knock block from link?
Thanks

Falko123

Hi it's been a few years since I worked with the link, but from my memory there's only one knock sensor input on the S7S8 link plug-in.
And in the OEM harness it's only one wire which would be the positive and that's the one going back to the ECU. I also believe there was a pin out in the install manual.
So I would believe a knock block should be needed for the second sensor.