Jump to content
SAU Community

RB20DET running too lean...plz help!

4bella

By 4bella,
in Engines & Forced Induction

 Share

Recommended Posts

TurboX Mentor

TurboX

Posted
Posted

You have increased all the air flow systems and have not (or the ECU has not ) increased fuel flow. Or maybe it has but you have other issues as well.

I would replace the fuel filter as the easy first step, then check the pump filter.

Then check your injector duty cycle and fuel pressure.(is it rising with boost?)

You did not say what power you were making but it's obviously starting to get well over stock where more fuel is needed to keep the A/F ratio correct.

4bella Collaborator

4bella

Posted
  • Author
Posted

yeah i have a remapped ecu chip which actually has better a/f ration than my previous one as my previous ecu chip was a mines one...i set my boost on 15psi, the guy didnt bother boosting it all the way and revving it all the way coz he said i could blow the engine coz it was alreayd too lean ... yeah the a/f ration was getting more lean as the boost was climbing... so yeah thats wat they guy said it could be my fuel pump or regulator as i have a fuel regulator and its adjusted already to 45psi....so yeah he siad it most probably is the fuel pump....if it is wat pump u reckon i can get ? i was told the bosch 044 is the way to go....

cameron Mentor

cameron

Posted
Posted

You answered 1 of my questions, dude its pretty hard to narrow down the problem with out the facts, but from what you have given me it could be a number of things. blocked injectors, fuel pump & too much boost - 15psi is too high for stock fuel system.

Try a bosch 044 pump if that doesnt fix your problem then you need bigger injectors or to get them flow tested.

4bella Collaborator

4bella

Posted
  • Author
Posted

sorry the a/f on idle was 20, when on, low revs it was on 14/15 then as it was boosting higer and revving higher so did the a/f ratio, it hit 16/17 and they guy dynoing my car stopped coz he said it was too dangerous to push it more...it only hit 180 hp when he stopped it...

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
      Ethanol Content Sensor - Always at 11%?

      By Kinkstaah · Posted

      So yes. All of them. Something like 98% of all fuel in the USA has 10% ethanol: https://afdc.energy.gov/fuels/ethanol-fuel-basics It's labelled as like, AKI, 87, 91, 93 with an E10 or E5 or E15 label on the pump. At a certain point, it's not just "E10" instead of 91. It is 91, 95, 98, and all of them have 10% Ethanol in them. You can also get E85 and E30 which is why you do see some people rolling around with E30 tunes in them.
    • Stringycheese
      Blue slip

      By Stringycheese · Posted

      Thanks for the response. This is an 04 EP3 Type R. JDM spec. Fairly certain they're just basic BC racing coils. I do plan to keep as the ride quality on stock I've been told is pretty meh given Sydney roads. If I were to go down that avenue, does NSW require them to be a certain spec (close to original) etc?
    • PranK
      Blue slip

      By PranK · Posted

      Should have asked what is the car?
    • PranK
      Blue slip

      By PranK · Posted

      I've had two super conflicting experiences with blue slips. My 30 year old E39 waltzed through with no issues but my brother in law was knocked back on 12 y/o 3 series due to wiper blades and some cracking in a control arm bush.  What kind of coil overs? Do you want to keep them after?  If it was me I'd get some dirt cheap shocks and springs from eBay or scumtree. Not ideal but will get you over the line and might even be less than $1k.
    • QB6SAGR
      Tein Circuit Master- rebuild worth it?

      By QB6SAGR · Posted

      Hey guys,  Way back when (about 15yrs plus), I picked up a beautiful set of Tein 'Super Racing Spec Circuit Master RE' coilovers from Russman. I have legit never fitted them to my car, as it was garaged indefinitely while i bought a house Yada Yada. They look brand new! Anyway its time to pick up where I left off, and have started doing some khanacross and am booked in for a hill climb next month. The car has some hard af Nismo shocks in ATM, which has me wanting to upgrade again, and now I am left wondering if it's worth having these teins rebuilt? I think they where an ok shock back then, but how do they compare to what's on the market now?  Shockworks/mca are 2800+, and I am sure they are great. But if I can have these rebuilt and be better than, say, a set of bc's for around the cost of bc's, I would be happy with the performance v cost trade off.  If they are considered outdated and rubbish these days, so be it, I'll put them on the shelf and be happy to look at the pretty green colour while I save for the SW/MCA option. Grateful for your thoughts on the matter, and suggestions on who could do the rebuild if it's a worthwhile pursuit.  cheers, Rowdy. 
×
×
  • Create New...