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Knock Sensors

wig r31

By wig r31,
in Engines & Forced Induction

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cdorhout Newbie

cdorhout

Posted
Posted
did you actually notice any diffrences by mounting them in the higher positions??

I can't say. I moved the knock sensors right away when I built my RB30, so I couldn't compare. Since the stock sensors were right below the deck surface, I wanted to keep them in that same relative location.

GT-RZ Community Regular

GT-RZ

Posted
Posted

I think unless you need to re-tap for the 26 sensons you are wasting your time. As you know iron is very dense and has no problems transferring shock through it, especially an inch or so below the standard locations.

My best guess to why they are there would be easability of production but i could be wrong. if you look at the Standard RB30 mounting positions they appear to be exactly the same postion as RB20,25,26 so maybe given that the block is identical excluding final height they just sent it down the line and used the same tapping jig as all the others.

It may be cast there origionally with good intentions because theoretically deck height or (the furthest contacting point at the end of the stroke) would produce the largest forces as it changes direction..

i could wabble on about forces and piston speeds but it's not relevent.

Nissan in short, knows there sh*t :P and if they think the sensor is ok there then it is!!

  • 2 months later...
WHITER33GTS-T Veteran

WHITER33GTS-T

Posted
Posted

I have built up a 26/30 and have heard that there isnt any point in running knock sensors as im running haltech E11. I just want a heads upif I should put them in or not..? I have my old RB25 sensors that fit the 30 block so are they ok to use..?

Cheers

  • 3 weeks later...
proengines Rising Star

proengines

Posted
Posted
I have built up a 26/30 and have heard that there isnt any point in running knock sensors as im running haltech E11. I just want a heads upif I should put them in or not..? I have my old RB25 sensors that fit the 30 block so are they ok to use..?

Cheers

Rob, does the Haltech have the facility to use the knock sensors? I'm computer dumb where it comes to tuning. If you can use them, use them for sure. Have you got it up and going yet?

WHITER33GTS-T Veteran

WHITER33GTS-T

Posted
Posted
Rob, does the Haltech have the facility to use the knock sensors? I'm computer dumb where it comes to tuning. If you can use them, use them for sure. Have you got it up and going yet?

Hey Greg,

I have haltech E11v2 and dont think it can run them. Will see the tuner tomorrow and find out.

We fired it up to run the cams in and everything went well.

Hope to get it in to have some bigger cooler pipes made up this week and catch can, then will be off to the rollers for some exercise.

I will let you know how it goes :-)

Mr Jollwah Community Regular

Mr Jollwah

Posted
Posted
The factory ECU will not retard the timing if it sensors detonation. From what I have seen it will switch between high and low octane maps based on knock feedback at low rpm high load. If it changes from high to low and it still continues to detonate there is nothing it will do to stop it. So in a sense they do f**k all.

The factory ecu has a low octane timing map, So the question is how low an octane fuel or how high a cylinder pressure are we talking about. The std ecu does have its limits, Mine used to knock like a salesman everytime I got crap fuel when the local servo ran out of premium.

  • 3 years later...
  • 3 weeks later...
  • 5 weeks later...
luke gtr Grand Master

luke gtr

Posted
Posted

In the case of my RB30 block i simply drilled and tapped the blanked upper positions, the tuner will need them to monitor knock levels on the dyno.

I forgot to whilst it was out of the car.

so, this was easier than attempting it in the car.

especially since they have to be dead straight.

  • 3 weeks later...

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