Jump to content
SAU Community

Please Help *urgent*

calais25t

By calais25t,
in Engines & Forced Induction

 Share

Recommended Posts

Sydneykid Grand Master

Sydneykid

Posted
Posted
Bump.

Come on guys I need to know if its necessary for my engine to run.

From what I can tell my after market computor isnt even plugged into it anyway.

Do I need to plum it in or not?

What throtte body are you using?

:D cheers :wub:

Sydneykid Grand Master

Sydneykid

Posted
Posted
Im using an XF throttle body and also my computor dosent run a throttle position switch/sensor.

Its an EMS stinger if that helps.

The common solution is to use a throttle stop on the XF throttle body to control the idle rpm and piss off all of the ECU controlled idle speed hardware.

:D cheers :wub:

BHDave Grand Master

BHDave

Posted
Posted

I ran my rb20 without it for a year or so. Started and idled fine, it would just stall approaching the same speed hump every morning :D

So i got in the habit of clutch starting it once past the speedhump and it was happy to keep going after that.

calais25t Enthusiast

calais25t

Posted
  • Author
Posted
The common solution is to use a throttle stop on the XF throttle body to control the idle rpm and piss off all of the ECU controlled idle speed hardware.

:D cheers :wub:

Could you please elaborate on this sydneykid?

Are you saying not to run any of them including the two on the back of the plenum?

Thanks.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Could you please elaborate on this sydneykid?

Are you saying not to run any of them including the two on the back of the plenum?

Thanks.

You need to talk to your EMS tuner, as to how he wants to control the idle rpm. The standard RB20/25 throttle body closes completely. So the standard ECU (and Power FC) controls the idle rpm by opening and closing various valves that bypass the throttle body. So when it is cold the ECU advances the ignition, richens up the A/F ratios and increases the airflow into the engine to increase the base rpm and give stable idle. Similarly, when the engine is up to operating temperature, the ECU increases the airflow into the engine to increase the rpm for air conditioning, power steering and electrical load.

I haven’t studied the idle control circuitry in great detail, but my simplistic understanding is the ECU open up various different sized valves depending on the idle speed demand for air flow. This is different to many other engines that use a stepper motor to open the throttle butterfly to achieve the airflow changes required.

The EMS’s that I have dealt with don’t have the feature of staged valve openings to control idle to a number of preset rpm's. So the tuners tend to use a throttle stop to hold the throttle butterfly open, then use A/F ratios and ignition retard/advance to achieve idle stability, hot or cold.

So talking to your tuner is always first on the list when looking at idle speed control

:D cheers :wub:

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

    • Dose Pipe Sutututu
      Shoota's R33 GT-R RB30/26

      By Dose Pipe Sutututu · Posted

      oh they were with that motor, you need to remove the engine to change the spark plugs (don't have to, but it does make it easier)
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      I certainly fall into the annoyed camp, but glad to hear that if it's happening at low boost then I'm not likely going to blow a turbo and end up with metal shards in my oil. Just feels like it prevents me from really driving it without hesitation and "peak" performance. Wonder if it's the VCAM, it did an impressive job of shifting the torque curve and faster spool, but maybe now it's "too fast" and there's too much air for how open the throttle is.  Based on some other threads, will also do some reading on synchronizing the actuators. They are the default actuators that come on the Garrett's and I would think they would be set the same coming from the factory, but if the turbos don't actually work exactly the same way at the same time as previously mentioned, it would be worth making sure the actuators are actuating together properly
    • GoHashiriya
      R34 Skyline Sunroof Won't Tilt/Vent

      By GoHashiriya · Posted

      I went down this rabbit hole before, ended up sourcing a motor from the UK (I'm in Japan) which also didn't function correctly. With the original motor, I disassembled it and reassembled it and it works somewhat, sometimes. What I could deduce from all my screwing around is that there is calibration of the gears on the inside of the motor and two ramps on the main gear which activate switches that operate the motor and move the sunroof either to retract into the roof or tilt. Where I got stuck was that, it seemed in my case that one or both of the switches that are activated by the ramp on the gear did not always activate and thus the motor did not move, causing it to sometimes not retract or tilt (apologies, I've forgotten which way it didn't work.).  Of course this part is discontinued at Nissan now, it's the same part in the S15 but no other models. I also contacted the manufacturer of the component for schematics - forgot the name, they're based in Gifu - but they declined to share the information due to being bound by an NDA, sadly. Looking through my pictures now, it seems I last had a crack at this in 2022. See, I so kindly wrote "open" and "close" next to the switches. If you figure it out, please do tell me. Those little switches, with the red buttons may need to be replaced.
    • GTSBoy
      R34 Skyline Sunroof Won't Tilt/Vent

      By GTSBoy · Posted

      Something's broken.
    • 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. 🤣
×
×
  • Create New...