Jump to content
SAU Community

RB26 Speed Governor?

Kip
 Share

Recommended Posts

Duncan Grand Master

Duncan

Posted
Posted

I am not sure what the Japanese rule is, but in Australia the speedo is required to read 0-10% higher than actual speed, I note every nissan I've had has read at least 5% above actual.

Since they dyno is reading actual speed I reckon the difference is due to tyres + factory speedo error.

When you change out the ECU after you modify it, the speed cut no longer affects you.

Or, go total old school and just cut wire 53 (speed input) at the ECU, the car still runs fine.

joshuaho96 Veteran

joshuaho96

Posted
Posted
23 hours ago, Duncan said:

I am not sure what the Japanese rule is, but in Australia the speedo is required to read 0-10% higher than actual speed, I note every nissan I've had has read at least 5% above actual.

Since they dyno is reading actual speed I reckon the difference is due to tyres + factory speedo error.

When you change out the ECU after you modify it, the speed cut no longer affects you.

Or, go total old school and just cut wire 53 (speed input) at the ECU, the car still runs fine.

It runs fine but it'll cause a bit of weirdness, the ECU definitely uses the speed sensor input for idle. Sounds like OP needs a tune anyways so just do a power run in a lower gear to avoid hitting the ECU speed limit for a baseline and then run a standalone to sidestep the issue. RB26s seem to really hate going much below 1000-1200 rpm especially if you put any kind of load on them so it's nice to keep around for refinement reasons. Or maybe I just need a new harmonic balancer.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
On 17/03/2024 at 7:15 AM, Duncan said:

Since they dyno is reading actual speed I reckon the difference is due to tyres + factory speedo error.

I reckon the car was run in 3rd gear not 4th on the dyno.

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

    • PranK
      Shoota's R33 GT-R RB30/26

      By PranK · Posted

      It says 300ZX, does that make it an Aus delivered car? Funny how back in the day I just couldn't care less about Z32's and these days I am just in love with them. Back when Nissan was into pushing the envelope. 🤣
    • ShezzDogs
      R34 Skyline Sunroof Won't Tilt/Vent

      By ShezzDogs · Posted

      Hi guys, just after some guidance with an R34 sunroof that has stopped working correctly. It still opens and closes perfectly fine, but it no longer tilts/vents up or down. As a result, the rear of the glass now sags a bit as it drops down slightly in order to retract into the roof, but now it can't pop upwards into a flush position. I’ve probed the pins on the back of the switch connector with a multimeter and it seems like both switches (for open/close and tilt/vent) still work correctly. Any ideas on what it could be, or where I should even start in terms of diagnosing? I'm sure someone's had this issue before but I haven't been able to find anything online relating to this specific issue, most of the issues are with the seals leaking or the motor failing entirely. Thanks in advance!
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      Do you have some data like fuel pressure? It's really hard to say if you're still fighting a fuel system issue at this point. Could be something weird like the FPCM dipping out.
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Yeah in that case, pulling the dent out. Event a very slight dent can create a lot of work filler-wise and there is a strong chance the panel won't be the factory shape when you are done (as the dent will result in a new high point created somewhere, then everything is brought up to that new high point... but the panel shouldn't be that high if that makes sense).  So you've filled and primed the panel and it is flat, why would you go back and remove the primer and add more filler? 
    • CRSKmD
      R32 Sedan - Grip and Drift (have my cake and eat it too build)

      By CRSKmD · Posted

      Something else I have been faffing with while the car was off the road is making the AC work. Assuming the car isn't at a thermal limit the idea of having AC while waiting in line to go on track sounds delightful. I have actually been lugging around the weight of the entire system since 2018 when the RB25NEO went in without it working at all.  The main reason was in the first few events before I got around to re-gassing it the rubber hose that runs under the manifold had the factory heat wrap/sleeve fail resulting in this: ~2 years ago I purchased a complete used R32 AC line set but when I finally went to install it the line i needed was different where the expansion section is I found a local place that was able to replace the rubber section and re-crimp. They also added some modern heat sleeve to the hose Tight fit but fingers crossed this is the last physical piece of the puzzle needed
×
×
  • Create New...