A knock sensor has one purpose...to detect knock/pinking which is caused by pre-detonation. It is self monitoring system to protect the internals of the engine. Pinking can be caused by a handful of variables such as incorrect fuel or a ignition angle that is excessively advanced. By replacing the sensor with a resistor that matches the resistance of the knock sensor will erase the fault code stored in the ECU. The engine will not run on safety boost. However, under certain conditions, the ECU will advance the ignition angle excessively, as the knock sensor circuit is effectively open loop, where there is no feedback from the sensor as it has been replaced with a resistor. This over advance of ignition angle can hinder performance.

BUT CAN THIS BE DONE OK OF YOU HAVE A BOOST VALVE TIMMING CONTROL FITTED?????????:)

Detonation is not as simple as you have outlined, it can be caused by worn or badly setup injectors, a weak fuel mixture and even excess carbon deposits in the combustion chamber. Whats a boost valve timing controller.??

A knock sensor has one purpose...to detect knock/pinking which is caused by pre-detonation. It is self monitoring system to protect the internals of the engine. Pinking can be caused by a handful of variables such as incorrect fuel or a ignition angle that is excessively advanced. By replacing the sensor with a resistor that matches the resistance of the knock sensor will erase the fault code stored in the ECU. The engine will not run on safety boost. However, under certain conditions, the ECU will advance the ignition angle excessively, as the knock sensor circuit is effectively open loop, where there is no feedback from the sensor as it has been replaced with a resistor. This over advance of ignition angle can hinder performance.

BUT CAN THIS BE DONE OK OF YOU HAVE A BOOST VALVE TIMMING CONTROL FITTED?????????:)

 

That info is incorrect. The ECU does not advance the timing above the set parameters, it only retards it. A resistor will not cause any over advance if ignition angle or hinder performance.

Edited October 19, 200817 yr by Yowser

and... you would have no knock sensor.

They seem to be talking about an electronic boost controller

just one thing, detonation and pre-ignition are not the same thing.

just one thing, detonation and pre-ignition are not the same thing.

 

Thats true, however the det sensor seems to throw up pre-ignition on these cars and never detonation, so i just think of it all the same, lol

just one thing, detonation and pre-ignition are not the same thing.

 

True but both are pretty catastrophic and the cure for both of them engine management wise is the same.

So my question still stands can i still safely bypass it with a electronic boost controller fitted.and the reason i called it what i did is because mine got writin right accross it electronic valve controler.?

So my question still stands can i still safely bypass it with a electronic boost controller fitted.and the reason i called it what i did is because mine got writin right accross it electronic valve controler.?

 

The stock det sensor only works at low rpm, so although you loose the protection it's arguable that it wouldn't help in many cases - i.e. that you'll usually get detonation at high revs... so if you've got a faulty sensor (or harness) you can bypass it, and replace if/ when the engine is pulled... as to whether it's safe, your call; personally I'd do it!

The stock det sensor only works at low rpm, so although you loose the protection it's arguable that it wouldn't help in many cases - i.e. that you'll usually get detonation at high revs... so if you've got a faulty sensor (or harness) you can bypass it, and replace if/ when the engine is pulled... as to whether it's safe, your call; personally I'd do it!

this is now the time to think because my engine is nearly out pending weather it rains the rest of the week? and dose that mean yours is out?

Well if you are using a boost controller, you will have an aftermarket chip in the ECU. Therefore iliminating the standard ECU's 2nd map when it senses detonation anyway, so yes, in theory you can bypass the det sensor and fit a boost controller and chip. However, i hope you have a good ear because if it is detonating, theres no safety boost!!!! You'll need to hear it and knock the boost controller down. Is the car detonating? If so you need to make sure the det sensor IS the issue!!

 

 

Might be worth reading these threads about my Det ??

 

http://www.300zx.co.uk/forums/showthread.php?t=111538&highlight=det

 

http://www.300zx.co.uk/forums/showthread.php?t=111538&highlight=det

Edited October 20, 200817 yr by crotchrocket

I believe most chips still carry the safety boost map, for when the det sensor detects it.

 

If you are about to pull your engine then replace the det sensor and loom it is a no brainer?

I believe most chips still carry the safety boost map, for when the det sensor detects it.

 

If you are about to pull your engine then replace the det sensor and loom it is a no brainer?

how much is that going to cost me im taking the engine out myself because of the lack of pennies

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how much is that going to cost me im taking the engine out myself because of the lack of pennies

 

http://www.300zx.co.uk/forums/showthread.php?t=118229&highlight=dett

Well if you are using a boost controller, you will have an aftermarket chip in the ECU. Therefore iliminating the standard ECU's 2nd map when it senses detonation anyway, so yes, in theory you can bypass the det sensor and fit a boost controller and chip. However, i hope you have a good ear because if it is detonating, theres no safety boost!!!! You'll need to hear it and knock the boost controller down. Is the car detonating? If so you need to make sure the det sensor IS the issue!!

ANWSER NO THE OLD SAYING IS.PRIOR PREPERATION PREVENTS PISS POOR PERFORMANCE.

Might be worth reading these threads about my Det ??

 

http://www.300zx.co.uk/forums/showthread.php?t=111538&highlight=det

 

http://www.300zx.co.uk/forums/showthread.php?t=111538&highlight=det

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