Jump to content
SAU Community

Rb25det Missfire Problem

sickfellaz
 Share

Recommended Posts

sickfellaz Rookie

sickfellaz

Posted
Posted

i hosed my engine bay out last weekend like a dickhead and ever since my r33 hasn't been the same. it idles rough and misses like a bitch upto and over 4500rpm. i've driven it a bit without the coil pack covers hoping to dry it out but still no change and i noticed it seems like it gets worse as the car gets hotter. any advice on this matter would be appreciated thanks

Link to comment
Share on other sites
Nismo_God Veteran

Nismo_God

Posted
Posted

yep water around coils and sparkies.....could have failed coils if old and cracked....mine did the same thing after a coilpack failed....change sparkies, leave them out and leave bonnet open to dry everything out....maybe even leave coils out in the sun.....

Link to comment
Share on other sites
Gaspard Contributor

Gaspard

Posted
Posted
might try that. i've read in a topic to regap the plugs to 0.8 and silicone up the coil packs

yep it works... if your coils have the usual "heat crack on the side" problem that most old coils get.

Silicone or (in my case) high-temp gasket maker will fix the problem for a while... obviously if the coil is completely gone you need new one(s)...

Quick test by just taping them up if that fixes it you can move on to silicone or epoxy etc...

note that the cracks are so small they can be hard to see...

Link to comment
Share on other sites

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

    • Kinkstaah
      Boost level and torque curve

      By Kinkstaah · Posted

      Because there is still an engine underneath that turbo. PSI is not a measurement of power, it's a byproduct of resistance. What would be really decent is to have a CFM gauge on the output of a turbo to see how much it's actually pushing. 21psi (as an example) is not the same amount of air at 3000rpm as it is at 7000rpm, even if the boost controller is controlling boost at "21psi". The engine is inhaling and exhaling way more air at 7000 than at 3000, even if it's less efficient.
    • thx78
      Boost level and torque curve

      By thx78 · Posted

      don't want anything more or less, I don't really understand why the torque still goes up to 6000-6500, while the boost peak is around 4000. if it only comes from the cams or from the boost controller etc.  
    • Kinkstaah
      Boost level and torque curve

      By Kinkstaah · Posted

      I'm not sure you understand the physics of what you are asking. Can you draw on the dyno graph what you want to have happen? I'm thinking this is a functional impossibility here, unless you chose a turbo literally so laggy that torque is at max at 7000rpm and artificially choked prior to that. Power and Torque are intrinsically linked. Power is just Torque over time. What you're really seeing in the torque graph is "Power per RPM" if that makes any sense whatsoever. You still get more power at 7000rpm than 5000rpm, because it is "power per RPM" and you have more RPM. at 7000 than you do at 5000. You still feel more powerful at 7000rpm. The torque graph will influence the rate of power increase per RPM.
    • luke gtr
      Hello from the UK

      By luke gtr · Posted

      Welcome!  If possible,  would live to see some pics. How long was it away getting the work done? Hopefully it feels like a new machine.
    • thx78
      Boost level and torque curve

      By thx78 · Posted

      yes indeed the graphic format makes a visual difference but there is on average 120nm more between 4000 and 6000rpm on the curves it is not nothing. you are right, the cams influence the torque curve. I was able to chat with one of the Hypergear tuners, he confirmed that a boost control allows you to manage the pressure after the spool. the absolute pressure (psi) on the graphics is measured where? It seems that the cams affect the maximum pressure depending on the regime but I may be wrong.   not pleasant to drive before 4000? if we spend our lives between 1000 and 3000 rpm as you say then we might as well just run diesel turbos
×
×
  • Create New...