Jump to content
SAU Community

Dramas With Gtr

slowGTR

By slowGTR,
in Engines & Forced Induction

 Share

Recommended Posts

slowGTR Apprentice

slowGTR

Posted
Posted

hi ppl..

i noticed this problem when i was stretching 3gear today...dont know what it is but in 3rd gear on full throttle my turbo seems to be boosting and not boosting all at the same time... very hard to explain.. but almost feels like someone is holding the car back and letting it go holding it back and letting it go.. whilst driving...

has anybody experienced this before..

im worried

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/
Share on other sites
double overhead sun visors Community Regular

double overhead sun visors

Posted
Posted

hard to say with that description. Weird that it's only in third.

I'd be checking simple things like plugs for starters. Pull the plugs & have a look at 'em replace any suspect ones, or all of 'em if they haven't been done in a while, if oily or cooked then look further. Probably only something simple... You may be surprised how a fouled plug can make the GTR do some very odd things...

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3786326
Share on other sites
Primordial Grand Master

Primordial

Posted
Posted

Compressor surge maybe... does it sound like the boost is surging? I've had a similar problem. Mine started in third gear only and now its doing it in second as well.. I've had it tuned out before (PowerFC), but it came back.. I havent worked out whats causing it even to this day.

Mine only happens between 4000 and about 5500rpm. Do you get the same sensation of it only happening between certain RPM?

Ignition problems will give you a farting popping noise out the exhaust. Do you hear this at all?

I changed my sparkies and installed splitfire coilpacks and it made no difference to my surging problem - fixed the ignition misfire though :blink:

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3786928
Share on other sites
donutdavid Community Regular

donutdavid

Posted
Posted

My guess would be fuel pump as well, given that it's not happening in the first gear. i've had this with my other car where fuel pump was tested and working, However the flow rate was wrong and once the new pump went in it was OK.

Could also be something to do with you turbo comp. surge like Primordial said.

my 2 cents

Good luck :blink:

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3787019
Share on other sites
slowGTR Apprentice

slowGTR

Posted
  • Author
Posted

hey guys.. yeah come to think about it i do hear a fair bit of backfire from my exhuast.. but i thought this was normal. ???

coming back to this mucking around with the boost n all.. mine happens after about 5500 rpm onwards all the way to 8000... dont know what is causing it.. dont think its the plugs,they look fine... might get someone to look at it this w.end..

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3789286
Share on other sites
Primordial Grand Master

Primordial

Posted
Posted
hey guys.. yeah come to think about it i do hear a fair bit of backfire from my exhuast.. but i thought this was normal. ???

coming back to this mucking around with the boost n all.. mine happens after about 5500 rpm onwards all the way to 8000... dont know what is causing it.. dont think its the plugs,they look fine... might get someone to look at it this w.end..

are you tlaking about backfire when backing off the accelerator or while accelerating? they are two very different things... :(

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3789471
Share on other sites
some_cs_student Veteran

some_cs_student

Posted
Posted
are you tlaking about backfire when backing off the accelerator or while accelerating? they are two very different things... :(

A little backfire when backing off the accelerator is ok isn't it? Happens sometimes on my car but I was assuming its normal.

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3789568
Share on other sites
Primordial Grand Master

Primordial

Posted
Posted
A little backfire when backing off the accelerator is ok isn't it? Happens sometimes on my car but I was assuming its normal.

Yeah it'll happen when your car is running rich... a little bit rich is ok. Also when your cat gets a bit older it can cause backfiring. Nothing to much to worry about really, apart from the fact that you'll probably fail an emissions test if you get defected :(

Link to comment
https://www.sau.com.au/forums/topic/214394-dramas-with-gtr/#findComment-3789802
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

    • JC71
      98 R34GTT 4k engine stumble

      By JC71 · Posted

      forgot to mention that when it does this it does not kill the engine, but I have not kept the pedal down long enough to let it, as I see no reason to beat up on it as its got to be something simple, small and dumb causing this.  And as soon as I let off pedal, the engine returns to its normal super smooth operation and rpms re-stabilize quickly, once below 4k. 
    • JC71
      98 R34GTT 4k engine stumble

      By JC71 · Posted

      neither stumble or cut really seem to be an appropriate term....hard to explain its like a rev limiter but at 4k, but it violently shakes engine and entire vehicle as the rpms will not rise over 4k, even with slow acceleration. as soon as it hits 4k, it sounds like entire spark is lost entirely. plugs were 1.1 which I used as such, but later put in new plugs gapped down to .8 changed back after issue arose when I replaced the coils, still does it with either plug gap...damn and it was all running so good.
    • TurboTapin
      Why am I hitting a power wall with my stroked RB25?

      By TurboTapin · Posted

      Oh how times have changed! I actually lean it out relative to my water/methanol injector duty cycle. The methanol adds a lot of fueling and you can then lean it out even more due to reduced knock. 
    • Dose Pipe Sutututu
      Why am I hitting a power wall with my stroked RB25?

      By Dose Pipe Sutututu · Posted

      Yeah my thoughts are the same, a well thought out WMI setup, would be slightly ahead of just straight E85 and you're also chemically intercooling the charged air, dropping it even further. This is why you need to add so much more fuel as soon as you spray. I remember someone taking me through their set up before (Dennis, has a R33, lives around Cabramatta - no idea if he's still around on this forum). He would target AFR 10:1 on 98, then as WMI ramped on, AFR would lean back up to 11:1. Amazingly, he did this all through his PowerFC, a relay to cut power to his EBC solenoid if there was not enough line pressure on his WMI kit. And of course, if there wasn't any boost made above gate pressure, you wouldn't be accessing the load cells with heaps of timing for WMI. One downside to that rudimentary setup, once the WMI came on, the EBC would unleash the dragon, and of course all the timing. Tyres would fry lol.
    • MBS206
      RB25DET with solid lifters - which cams ?

      By MBS206 · Posted

      Shimmed or shimless, still solid, no hydraulic pump up stuff.
×
×
  • Create New...