Jump to content
SAU Community

Where Do Skylines Get Speedo Signal For Ecu?

wlspn
 Share

Recommended Posts

wlspn Proficient

wlspn

Posted
Posted

As above, where do Skylines get the speed signal for the ECU from?

Cant be gearbox (not on 32s anyway) as 32s have a speedo cable & yet the ECU still gets a signal...

I have a digital speed readout on my turbo timer (which is mounted just above cluster) & it's not working.

Recently installed an RB25DET & had the original ECU from that installed, didn't work.

Now have a Haltech, doesn't work.

Car has been off the road that long I can't remember if it stopped working while the RB20 was in or just since I've swapped engine & box.

99% sure it had stopped working even with the 20.

Problem is I fitted the R33 box with the engine & haven't sorted the cable yet so have no speedo at all.

Would be nice to have some idea how fast I'm going!

Also caused a few problems with ECU where things want to be speed activated, such as VCT, etc (can get around it but still...)

Would be really handy if someone could help me out so I can fix everything.

Cheers,

Brett

PM-R33 Grand Master

PM-R33

Posted
Posted

Ok trying to remember off the top of my head it goes like this:

R33 - electronic speed signal from gearbox to dash - then electronic singal goes to ECU - then electronic signal goes to HICAS ECU

R32 - cable speed signal from gearbox to dash - then electronic signal goes to ECU - then electronic signal goes to HICAS ECU

So really they are the same other than the initial signal from the gearbox itself.

wlspn Proficient

wlspn

Posted
  • Author
Posted

So you're saying that if cluster doesn.t work, neither will digital speedo?

Was pretty sure at least one of the times I stripped the gear off the speedo cable (cluster end) the dash speedo didn't work but the digital speedo did... Could be wrong but. If you're right I definitely am.

mad082 Grand Master

mad082

Posted
Posted

my mate put a 25 into his ceffy and had issues with the speedo. he wired the wires straight to the ecu and then the first time he went for a drive he was hitting the speed cut in ist gear. seemed to be that when it is wired through the dash it drops the voltage, so without it the ecu thought he was going much faster than he was. i think he ended up just cutting the wires to the ecu. he was using a rev speed meter for the speedo.

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

    • funkymonkey
      R32 Nostalgia

      By funkymonkey · Posted

      Yeah, hard to find and a pain in the ass to change with the transverse engine. I’ve worked on a GTiR before and it’s not a job I’d ever want to do again. theres a company in South Africa that makes RS3 gearbox adaptors for the AWD SR20 including gearbox mounts, so I could modernise it and go a dual clutch with paddles. For now tho, it ticks all the boxes. Super cheap, can throw the kids and their junk in the back, and SR20 that I can turbo cheaply, a CVT that’s not a dog’s breakfast like the V35, and has 80% interchangeable parts with stuff I can source from the wreckers cheaply…. But it’s still unique. I love the wagon back of the Autech version. It’s cheap enough that I can buy another stock manual FWD Primera with SR20VE, swap the gearbox to the N15 pulsar short gear ratio box, swap out the brakes to the R32 ones I pulled off my 32, register it on club plates and take it racing. $1300 shipping from NZ. Heaps of parts and aftermarket builders for transverse SR20’s in NZ.
    • joshuaho96
      New R32 owner soon

      By joshuaho96 · Posted

      Hard to say, just pop the rocker covers off and have a look if you think it's cammed. You probably need to replace the valve cover gasket/half moons anyways.
    • niZmO_Man
      R32 Nostalgia

      By niZmO_Man · Posted

      From my youth: GTi-R clutch change is a massive pain. The gearboxes are fragile? But the car is super cool and I want one 😢 
    • niZmO_Man
      New R32 owner soon

      By niZmO_Man · Posted

      Remember this is 1988 tech.
    • TurboTapin
      R32 GTST - 600KW+ RB28/CD009 Build

      By TurboTapin · Posted

      Driveline vibration is resolved. I ended up loosening all my engine mount and trans mount bolts, giving it a good shake then retightening everything and it's gone... Let's just say I was surprised that fixed it.  I've been happily driving it around again but unfortunately put zero time into my direct port/constant pressure WMI setup. I'm on vacation next week, so I'll try and finalize it then.  On a different note, I spent all week fuel/ignition mapping 2x 216L V16 engines. Turbo's were burning glycol and we swapped them out for larger units. We also had planned emissions testing on site, so I figured I'd be there the same week to use their instrumentation and massage any emissions issues out if needed. This was a first for me. Fuel management is similar in certain ways to automotive (i.e air density as load variable) but very different in others. It's all PLC based and AFR's are controlled by air and not fuel. They use a control valve between the turbo and air manifold to control pressure which in turn controls AFR's. Due to this, target AFR tables supplied by the OEM are in pressures and not mass which really through me off. They use air pressure vs fuel pressure tables. I also relied on an O2 concentration sensor the emissions team had in the exhaust. Ignition timing was also all over the place and we were losing a fair bit of power. They're now happily sitting at 16-40BTDC depending on load. We were making about 1600kw at 900rpm at 90% load. Engines were running a lot smoother as well.    
×
×
  • Create New...