Jump to content
SAU Community

Ecu Or Fuel Problem Car Gets Tuned Then The Entire Tune Slowly Goes Rich

jarrod83

By jarrod83,
in Engines & Forced Induction

 Share

Recommended Posts

jarrod83 Community Regular

jarrod83

Posted
Posted

Hey guys, i finally got my turbo n everything running correctly.. so i give the car a tune at first myself and after a week the whole tune turned rich again.. so i retuned it a few times then thought i may of been doing something wrong... so i called a few workshops and they just said the usual "oh it just needs a "proper" tune", so i sent it to be tuned n made 408rwhp on 19psi which wasnt to bad, so for the first few days it wasnt to bad and i runned a wideband on it... nice 14.7s on light cruise to 11.5's-11.6s on full boost..

So a few days later it started to feel abit slower and chewing a fair bit more fuel so i put the wideband back on it.. its now runnin 12s-13s around town.. n 10.9's-11.1's on full boost...

Is there anything else other than the ecu that could be causing this weird problem??

btw the ecu is a power fc pro

nismo 740cc injectors

sard fpr.. but the fuel pressure hasnt changed on it

Cheers

Jarrod

SECURITY Grand Master

SECURITY

Posted
Posted

the stock o2 sensor might be messing with the afr's. what happens is you pull out the stock narrowband to fit the wideband, then tune it while the narrowband isnt reading anything. then you put the stock narrowband back in and it messes everything up again. my mate had the same problem with his pfc.

try unplugging the stocky completely and see where that gets you. your other alternative is to get your tuner to tune the car with the wideband that hooks into the rear of the exhaust and leave your stock narrowband in.

femno Grand Master

femno

Posted
Posted

Turn 02 Sensor feedback OFF. If your tuner forgot to do that id be really worried.

Check out Paulr33's PFC FAQ to decipher which jap symbol means OFF and which one means ON.

Keep an eye on AFRs after that.

STATUS Grand Master

STATUS

Posted
Posted (edited)

vacuum /boost leak..... cheack over cooler pipe joins etc. 02 sensor feedback wont effect anything other than cruise and light load, full throttle is derived purely from specific map values..

oh turbo could be on its way out, check boost curve.

Edited by URAS
  • 2 weeks later...

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

    • RP1421
      S15 Spec R

      By RP1421 · Posted

      A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Murray_Calavera
      WTAC 2025

      By Murray_Calavera · Posted

      Yeah mate, never miss it.
    • Ozdavroz
      WTAC 2025

      By Ozdavroz · Posted

      Any going to watch World Time Attack at SMSP this year?
    • Jarsky
      R33 Fuel Pump & Brakes after alarm swap

      By Jarsky · Posted

      Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
    • zillah
      Recommendation for engine oil funnel spill free

      By zillah · Posted

      hahaha good on
×
×
  • Create New...