Jump to content
SAU Community

32 Gtr Running Like A Wheel Barrow

den001

By den001,
in Engines & Forced Induction

 Share

Recommended Posts

den001 Proficient

den001

Posted
Posted

i have a 32 gtr,

now on wendsday i took it to eastern creek and posted a top time of 11.7 at 115mph, with only a exhaust and 13psi boost, stock turbos, stock ecu

i was wrapt....

before this i could always noitce somthing like a choking feeling while the engine was reving out, and you could notice the torque loss, not massivly, but abit......

this was more only during the day time, during night it would run mad.... i put that down to intake temps

now, since i ran that time, the next day i went and put some cam gears on and set them to 2 deg advance on intake and 5 deg retard exhaust, ran the car, perfect, absolute animal compared to the 11.7 pass.... i couldn't believe it, this test was also at night, drove home, woke up im morning, and took for another drive, same as before, feeling lazy and choked up during the day, night came, abit better....

now tonight, i have noticed a big amount of power loss, and a shit load more laziness, the exhaust note has changed, sounds choked up, the engine builds boost good as i watch the gauge but its like the motor doesn't like the positive pressure its being given.... and lost throttle response...

i always put good fuel in aswell

also under load like at 2500rpm in 5th, ill put the throttle flat, and it will build boost probably up until 3000rpm and then the bov's start making their noises with my foot still to the floor...

now i think that this may be something to do with the computer, but im still unsure but wtf is the story with the bov's going off while still under load????

any1 with similar issues?? or theory's

any and all help is appreciated

cheers

denis

Link to comment
https://www.sau.com.au/forums/topic/226038-32-gtr-running-like-a-wheel-barrow/
Share on other sites
Rowdyr32 Mentor

Rowdyr32

Posted
Posted

Maybe you stock has picked up knock and is running the other map. Try disconnecting you battery for a while and put on the interior light for 2 minutes then reconnect everything. Possible??? Also try the diagnostic on the ecu?

The factory ecu can by what I've been told reterd timing if it sensors knock something a pfc cannot.

swanny180 Proficient

swanny180

Posted
Posted

Make sure your cat converter hasn't melted to pieces and become an exhaust restriction.

Only takes a minute or two to pull it out and have a look, and wont be difficult to replace if it is your problem.

den001 Proficient

den001

Posted
  • Author
Posted

ok, the cat is gutted aniways,

now i resset the timing back to standard and it seems to have more torque again, but that choking issue is still there, after about a 20 min drive when everyting warms up good, the choking issue rises again, could it be the o2 sensors???

i know that the cat o2 sensor is not there and the wire has been cut..... and they are definatly not touching....

yes 11.7 with only thoes mods...

pitty it wouldnt do a 18.7 now, jokes

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
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • dyl33
      VOLK RACING GTC CENTRE CAPS

      By dyl33 · Posted

      Centre caps $250
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Duncan
      Boost cut after swap(RB25DET NEO) R34

      By Duncan · Posted

      Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi.. Just another problem. So maybe you can help. I(my mechanic) done swap from my RB20DE NEO to RB25DET NEO. Everything is OK but we have a boost cut. Coils/Plugs are ok...AFM is ok. ECU is ok. I have Walbro 255 but it "changed" sound few months ago(you can hear it ouside) you did not hear that when it was new(maybe faulty?) Sooo...what now? What can cause this boost cut? It is even when you standing still...
×
×
  • Create New...