Jump to content
SAU Community

Knock Sensors

wig r31

By wig r31,
in Engines & Forced Induction

 Share

Recommended Posts

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...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • sunsetR33
      ugently need expert / experienced opinion

      By sunsetR33 · Posted

      I'm hoping I just don't have to do an engine rebuild NOW. Doesn't mean I won't do it at some point. I think a plus point is that the car presumably ran on or close to stock power nearly all it's life so far. Only the Owner I bought it from actually increased power with a standalone ECU and blew the OEM turbos. And after it got thee 2860s it wasn't driven an awful lot either.   That is what I meant. With the twins coming on so late (4500-5000rpm) I hope the rods won't want to exit the block prematurely. And it still being a 26 means the torque curve isn't gonna hike up all that much.   It didn't blow up on the dyno when they tuned it to 500ish crank. So I suppose it'll be okay for now. They did put a Tomei head gasket on first though which did not seal at all, and they redid it with a Cometic one. Which I hope won't be my water leak.   Mainly anything oil. So far all it has is the N1 pump, oil restrictor and a filter relocation kit with a cooler.
    • GTSBoy
      Comfortable replacement seats for R32 GTR

      By GTSBoy · Posted

      15000? ish? Something like that anyway. It wasn;t so much a wear as a tear that then spread. Might have lasted a lot longer if not bothered by just one incident, whatever it was. I took a punt. They are really comfortable and do a good job of holding. My daughter HATED it when I first put them in, and probably still does now. She has sensory issues and hates the way they are all up your business. I'm 197cm and 95kg. Not fat or particularly wide, and the XL size seat is the rigth fit. If I was any fatter it would start to get too snug. Any skinnier and you'd possibly want the smaller width.
    • r32-25t
      Comfortable replacement seats for R32 GTR

      By r32-25t · Posted

      Mrs rs focus came factory with recaro cs  sportsters in it and they a pain in the ass to get in and out of with the really high bolsters, once you were in them they were one of the most comfortable seats I have ever sat in
    • GTSBoy
      Shifting questions

      By GTSBoy · Posted

      The NA 2.5 has very little torque. You won't feel much. Those trannies are also a million years old now and it could well be f**ked. First generation electronically controlled autos will often refuse to kick down, ete, etc, depending on what's wrong with them.
    • GTSBoy
      ugently need expert / experienced opinion

      By GTSBoy · Posted

      Yes, but no but yes but no. Those "it's fine up to 500HP" rules and everything else like it were all determined back when the cars were 10 years old. As they are now 30 years old.....what do you reckon the chances of something shitting the bed are? I'd say they are much higher now than they used to be. You might be lucky. You might be unlucky. Spin the wheel and find out. Yeah, nah. It's actually exactly the opposite. Making boost early and having heaps of torque able to be generated right in the middle of the rev range will do more to damage an engine than having to rev it high to make the power. Think about the load on the conrods, bearings, etc, to make 400HP at 4000 rpm, vs 400 HP at 6500 rpm. So someone has already "let the Nissan out" which is how we describe the increased chance of a fiddled with engine to have had something done wrongly. Many more engines that have been opened die than stock ones do - even if you into consideration how they are treated wrt power levels and the like. Again, not saying that yours will definitely have been put back together by a moron. But the possibility does exist. It's still a lottery. Spin the wheel. What weakspots?
×
×
  • Create New...