Knock Sensors

[Haines]

If my car knocks too much for the knock sensor does it have some sort of failsafe

eg. will it cut ignition ????

My car is an R34 GTT

Im not sure of the knock sensors function

[Duncan]

Yes in the standard ECU the knock sensors can force the ECU to a safer second map.

No aftermarket ecu uses them automatically but at least the power fc uses the signal to run a warning light

[GeeTR]

Yes in the standard ECU the knock sensors can force the ECU to a safer second map.

No aftermarket ecu uses them automatically but at least the power fc uses the signal to run a warning light

One could get the function back by using an after market unit. NZ Link make one, and as much as people say about them, you could setup something pretty fancy.

Use the 5 LEDs of the KnockLink as inputs to a Haltech. Switch maps maybe, even flick a mosfet and make the AFM see 5v (to over fuel it)

Just noticed they make an amp called a Knockblock One could use the 0-5v signal again, to input into a stand alone ECU, or use it to fool a Trust, PFC etc.

[Adriano]

Autronic SM4 has individual cylinder ignition trim linked to the knock sensor circuit, very fancy it only retards the pinging cylinders, and i believe it can also be set to feliver a little more fuel to that cylinder as well

[Haines]

kinda drifting off topic

but the reason i ask is that on an R34 if it knocks too much will it cut ignition instead of going to a knock map or something ?

[GeeTR]

Autronic SM4 has individual cylinder ignition trim linked to the knock sensor circuit, very fancy it only retards the pinging cylinders, and i believe it can also be set to feliver a little more fuel to that cylinder as well

But can it retard ignition and add fuel as engine load increases due to wind load, through a ABS wheel speed sensor?

jk

kinda drifting off topic

sorry

[Adriano]

kinda drifting off topic

but the reason i ask is that on an R34 if it knocks too much will it cut ignition instead of going to a knock map or something ?

No it wont, although it wont ping on the low octane map even running on canola oil

[Adriano]

But can it retard ignition and add fuel as engine load increases due to wind load, through a ABS wheel speed sensor?

jk

sorry

I believe you could, but why would you when you have active knock control

[Cubes]

Do take in to consideration the ecu ignores the knock sensors above 4500rpmish.