Jump to content
SAU Community

Rb25det Wont Rev Past 4500

mr-r33

By mr-r33,
in Engines & Forced Induction

 Share

Recommended Posts

mr-r33 Proficient

mr-r33

Posted
  • Author
Posted
Interesting Intake piping....

When was the last ttime you changed the plugs?

still building it just wating for the intercool to finish off the Intake

i have not done the plugs on it but had them out and they seem to look ok...mybe do them tomorrow

any particular brand??? NGK platium plugs cost a bit or toyota have platium plugs for $6 a plug wich would be the same as the NGKs

Johny Bravo Proficient

Johny Bravo

Posted
Posted

I had a simular problem with my rb30. At first we thought it was the dizzy and rotor button but turned out to be the crank angle sensor. However mine was not doing it all of the time. Hopefully this helps you and doesn't send you on a wild goose chase like i had.

blk94r33 Mentor

blk94r33

Posted
Posted
the cas is part of the dizzy on rb30es

And they suck to diagnose without a decent graphing multimeter. Lol.

Would you describe it as in in-consistent miss, or a proper limiter? Does it do it worse under load,and does engine temp affect anything? And is the engine stock-standard minus the conversion bit or has it been modified?

mr-r33 Proficient

mr-r33

Posted
  • Author
Posted
And they suck to diagnose without a decent graphing multimeter. Lol.

Would you describe it as in in-consistent miss, or a proper limiter? Does it do it worse under load,and does engine temp affect anything? And is the engine stock-standard minus the conversion bit or has it been modified?

engine is stock dose it hot dont know about cold as i dont push it hard when cold

engine revs fine like normal untill 4-4500 under load with no load it will rev freely past 4-4500

Trozzle Grand Master

Trozzle

Posted
Posted

Yeah, I'm leaning towards coils and/or plugs. Keep in mind guys if this engine is stock, might have something to do with 4500rpm being the point it bumps the boost up to 7psi. While this is hardly high boost, if the plugs or coils are on their way out it might be enough to cause breakdown in the spark.

blk94r33 Mentor

blk94r33

Posted
Posted
Yeah, I'm leaning towards coils and/or plugs. Keep in mind guys if this engine is stock, might have something to do with 4500rpm being the point it bumps the boost up to 7psi. While this is hardly high boost, if the plugs or coils are on their way out it might be enough to cause breakdown in the spark.

That's what I was thinking with the hot/cold question, as coils that are starting to fail will play up alot more than once they get hot. It revs fine with no load? I'd be saying most likely an ignition problem, otherwise it could be a fuel problem (was it diesel before and did you flush the tank properly? Pressure problem? Blocked injectors?)

Have you checked the plugs and tried gapping them down to the .7-.8 range to see if it improves at all?

  • 3 weeks later...
mr-r33 Proficient

mr-r33

Posted
  • Author
Posted
That's what I was thinking with the hot/cold question, as coils that are starting to fail will play up alot more than once they get hot. It revs fine with no load? I'd be saying most likely an ignition problem, otherwise it could be a fuel problem (was it diesel before and did you flush the tank properly? Pressure problem? Blocked injectors?)

Have you checked the plugs and tried gapping them down to the .7-.8 range to see if it improves at all?

ok guys i have put new plugs in and still nothing but i think it dose it hot or could and somethimes it dose not do it but 99% of the time it dose

no was not diesel befor was petrol

here is a vid of it sorry about the s**t video but you can make out what it is doing

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

    • GTSBoy
      Engine Issue

      By GTSBoy · Posted

      Resizing injectors in Nistune can be done a couple of ways, and there are a couple of ways that you can make a mess of it. The tuner needs to be really aware of the effects of whichever approach he uses (either K, or TIM). They are both easy enough to "get the injector size right" to run the engine. But little details like old start enrichment and hot start are affected differently, depending on which boxes you check.
    • Murray_Calavera
      Engine Issue

      By Murray_Calavera · Posted

      Pretty safe to say almost everyone that has tuned their own car has experienced this issue. The difference being that we have our laptop in the car and when it happens, it's literally 10 seconds of tuning to sort it.  Would you be happy to plug in your laptop and sort this yourself? It is a very simple process and there is no risk of harming your engine (if you are worried about that). 
    • Harinder singh
      Engine Issue

      By Harinder singh · Posted

      Yeah thats the next step now, either they wil or i will take out for a drive to work and go straight their after work and see is we get the same issues 🤞  thought i try my luck here too, never know someone else might have had the same issue but thanks for the reply 
    • Duncan
      Engine Issue

      By Duncan · Posted

      Basically your tuner needs to drive it for the 30 min (or whatever) to create the same conditions then check the ECU settings and sensors at that time. They may not be excited to because that takes them 30 min rather than just opening the bonnet and seeing the problem straight away.... Hot start is generally not as tricky as cold start, but there would be a table for fuel enrichment vs coolant temp as a starting point
    • Harinder singh
      Engine Issue

      By Harinder singh · Posted

      Yeah, they all cant say anything for sure as everything is working fine . Said unable to find an issue untill it stops again. Could mist likely be CAS wiring or IAS valve issue but again not 100%
×
×
  • Create New...