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RB26DETT Knock Sensor

Genesis®
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Genesis® Grand Master

Genesis®

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Posted

hi guys,

got 231awkw @ 1.1 bar with PowerFC on the dyno yesterday. Happy with the results but not happy that the laptop (datalogit) and ITC shows KNOCK value = 1. Tuner said that the knock sensor might be disconnected and the reading will be a constant "1" regardless whether the engine's pinging or not. He had to use a oscillascope (sp) to listen in for any pinging/knocking during the tuning and 231kw was supposely a safe tune for me :cheers:

i have been reading through the rb26 user manual and tried locating the knock sensor but to no avail. Any of you guys know where the sensor is located?

thanks in advance.

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TODA AU Apprentice

TODA AU

Posted
Posted
i have been reading through the rb26 user manual and tried locating the knock sensor but to no avail.  Any of you guys know where the sensor is located?

thanks in advance.

There are actually 2 knock sensors on the RB26.

Both are located on the inlet side, under the intake manifold. (approx 3/4 way up the block)

1 is in line with Cyl 2, the other is in line with cyl 5.

They're round & black in colour with a 10mm bolt throgh the centre.

Plug is also black, 2 wire. Projects from the circular sensor @ approx 45deg.

Hope that helps.

Genesis® Grand Master

Genesis®

Posted
  • Author
Posted
There are actually 2 knock sensors on the RB26.

Both are located on the inlet side, under the intake manifold. (approx 3/4 way up the block)

1 is in line with Cyl 2, the other is in line with cyl 5.

They're round & black in colour with a 10mm bolt throgh the centre.

Plug is also black, 2 wire. Projects from the circular sensor @ approx 45deg.

Hope that helps.

thanks Adrian. i did try running my hands down the manifold to try feel for it but nothing. I guess i will jack the car up to have a better look from undernealth. It's irritates me to look at the ITC and have the knock value at "1".

Sorry i know its off topic but who tuned your car and what mods do u have.

car is being mod for the occasional trackwork. For the engine department, i have got ARC intercooler with pipings, Trust oil cooler, Trust sump, JUN adj exh/int cam gears, new belts, oil/water pump catch can, crank, twin air pods, avcr and power fc. Induction side, i have R34 GTR turbos pushing a safe 1.1 bar with full turbo-back exhaust system.

Chapmans & Chapmans at Wollongabba did all the engine work/mods for me and Mercury Motorsports did the tuning because they have the datalogit software and also one of SAU_QLD sponsors. Would have preferred Chapmans to do the tune because i have seen some very positive examples of Andrew's work.

TODA AU Apprentice

TODA AU

Posted
Posted
thanks Adrian.  i did try running my hands down the manifold to try feel for it but nothing.  I guess i will jack the car up to have a better look from undernealth. It's irritates me to look at the ITC and have the knock value at "1".

Glenn,

Look on the block, just forward of the water~oil heat exchanger where the oil filter mounts, above the front diff... Almost directly above the engine mount bracket, high on the block, hard up against it you should see the sensor (the forward one)

If it's not present, you'll see a raise circular boss where it should be. (With a central thread for the retaining/attaching bolt.

You will probably need a mirror & a torch...

Cheers

Adrian

Duncan Grand Master

Duncan

Posted
Posted

I had a knock sensor problem as well, seemed a former owner had not liked the reading it gave. So right at the computer they wired the ECU knock sensor input to a constant 0v...so it always read 0.

Anyway, check that first, find the ECU pinouts, follow that wire and make sure it hasnt been fiddled with :rofl:

Duncan Grand Master

Duncan

Posted
Posted

I couldn't agree more, I hooked it all back up.

My theory is there may have been an "overactive" knock sensor that was sending the ECU into safe mode...and it was easier to cut a wire than to replace the sensors.

After all the knock sensor is just a little microphone

Genesis® Grand Master

Genesis®

Posted
  • Author
Posted

many thanks to Adrian and Duncan.

Spent some time tracing and testing the wires and found out that the connector was dirty. Gave it a good cleaning and woops, my knock sensor is back online :(

went out for a drive and highest knock value registered was '32'. Did some research in here and it seems that anything less than 40 is fine. Will probably give it a good hard drive soon to see if the value goes up any higher.

GTR-Ben Proficient

GTR-Ben

Posted
Posted

Correct me if i'm wrong, but i believe the knock sensors do nothing but give a number when connected to a PowerFC.. as unlike the stock ECU the PowerFC does not remove timing etc if it sees knock..

It says this in the manual, also I think says anything under 60 is normally safe. :P

  • 1 month later...
fsmout Collaborator

fsmout

Posted
Posted

Yeah i am having the same problem. Had the car on the dyno and my tuner said that the knock sensor isnt giving a reading (i also have a PFC and want the numerical reading for further tuning).

I will try and give it a clean out, i thought i needed new ones!

I priced new items from nissan and they quoted $300 each!! I found a wrecker with a half cut who will sell them for $95 each which isnt to bad.

Does anyone know if these sensors usually fail??

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