Jump to content
SAU Community

Gtr Timing

Vija

By Vija,
in South Australia

 Share

Recommended Posts

Vija Collaborator

Vija

Posted
Posted

Hi, does anyone in Adelaide have experience with this or a timing gun which they know works properly on the RB26DETT. I keep reading about these "double readings" from cheap guns like the one I have, but I went and tried a very expensive one at a nearby mechanic and it gave the same reading.

I get light pinging at load from about 1500-2000rpm at times and that was after I set the timing using a spark plug lead to connect the coil to the no.1 plug. If I use the loop at the back of the engine I get totally different readings ie about 10-15 degrees higher.

Any ideas would be great.

Cheers,

Matt

Link to comment
https://www.sau.com.au/forums/topic/255179-gtr-timing/
Share on other sites
Madaz Grand Master

Madaz

Posted
Posted

Have you spoken to a tunner

and light pinging under load i hardly call 2000rpm load and if your just free reving it wont be under load at all

it was also my belief that if you have factory ecu you wouldn't need to check your timing and if you have a pfc then your tunner would of set it all up on the dyno?

Link to comment
https://www.sau.com.au/forums/topic/255179-gtr-timing/#findComment-4402191
Share on other sites
Vija Collaborator

Vija

Posted
  • Author
Posted
Have you spoken to a tunner

and light pinging under load i hardly call 2000rpm load and if your just free reving it wont be under load at all

it was also my belief that if you have factory ecu you wouldn't need to check your timing and if you have a pfc then your tunner would of set it all up on the dyno?

Hi, not free reving. Should have mentioned it's usually only >3rd gear at low rpm. And by load I mean labouring at lowish rpm. When I imported it I wanted to see what the timing was set at in case it had been screwed with. Yes the ecu controls timing but the CAS must be set correctly and then all tuning done via the ecu. Im still running a stock ecu.

Link to comment
https://www.sau.com.au/forums/topic/255179-gtr-timing/#findComment-4402264
Share on other sites
SLAPS Rising Star

SLAPS

Posted
Posted

Even with stock ecu still definitely have to check the ignition timing and adjust to 20degrees BTDC.

Something is definitely up if a 8.6:1 motor with turbo cams is pinging at light load. Its unlikely it will be an ignition timing issue but rather something else that should be sorted asap. Might not even be pinging.

Link to comment
https://www.sau.com.au/forums/topic/255179-gtr-timing/#findComment-4405735
Share on other sites
Vija Collaborator

Vija

Posted
  • Author
Posted

Yeah I'm starting to think it's not pinging. Possibly an accessory just making a bit of a rattle. It's definitely not the aircon, water pump or any pulleys relating to the timing belt because they have all been replaced lately. Possible power steering pulley but it doesn't change when turning the wheels.

Cheers,

Matt

='TheRogue' date='3 Feb 2009, 08:46 PM' post='4405735']

Even with stock ecu still definitely have to check the ignition timing and adjust to 20degrees BTDC.

Something is definitely up if a 8.6:1 motor with turbo cams is pinging at light load. Its unlikely it will be an ignition timing issue but rather something else that should be sorted asap. Might not even be pinging.

Link to comment
https://www.sau.com.au/forums/topic/255179-gtr-timing/#findComment-4407795
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

    • Murray_Calavera
      RB25DE NEO with Haltech ECU

      By Murray_Calavera · Posted

      @Haggerty you still haven't answered my question.  Many things you are saying do not make sense for someone who can tune, yet I would not expect someone who cannot tune to be playing with the things in the ECU that you are.  This process would be a lot quicker to figure out if we can remove user error from the equation. 
    • MBS206
      R32 GTS (RB20DE) Injectors Replacement

      By MBS206 · Posted

      If as it's stalling, the fuel pressure rises, it's saying there's less vacuum in the intake manifold. This is pretty typical of an engine that is slowing down.   While typically is agree it sounds fuel related, it really sounds fuel/air mixture related. Since the whole system has been refurbished, including injectors, pump, etc, it's likely we've altered how well the system is delivering fuel. If someone before you has messed with the IACV because it needed fiddling with as the fuel system was dieing out, we need to readjust it back. Getting things back to factory spec everywhere, is what's going to help the entire system. So if it idles at 400rpm with no IACV, that needs raising. Getting factory air flow back to normal will help us get everything back in spec, and likely help chase down any other issues. Back on IACV, if the base idle (no IACV plugged in) is too far out, it's a lot harder for the ECU to control idle. The IACV duty cycle causes non linear variations in reality. When I've tuned the idle valves in the past, you need to keep it in a relatively narrow window on aftermarket ecus to stop them doing wild dances. It also means if your base idle is too low, the valve needs to open too much, and then the smallest % change ends up being a huge variation.
    • Haggerty
      RB25DE NEO with Haltech ECU

      By Haggerty · Posted

      I guess one thing that might be wrong is the manifold pressure.  It is a constant -5.9 and never moves even under 100% throttle and load.  I would expect it to atleast go to 0 correct?  It's doing this with the OEM MAP as well as the ECU vacuum sensor. When trying to tune the base map under load the crosshairs only climb vertically with RPM, but always in the -5.9 column.
    • CF.Panda
      R34 25GT Engine Light 21

      By CF.Panda · Posted

      AHHHH gotchaa, I'll do that once I am home again. I tried doing the harness with the multimeter but it seems the car needed a jump, there was no power when it was in the "ON" position. Not sure if I should use car battery jump starter or if its because the stuff that has been disconnect the car just does send power.
    • Haggerty
      RB25DE NEO with Haltech ECU

      By Haggerty · Posted

      As far as I can tell I have everything properly set in the Haltech software for engine size, injector data, all sensors seem to be reporting proper numbers.  If I change any injector details it doesnt run right.    Changing the base map is having the biggest change in response, im not sure how people are saying it doesnt really matter.  I'm guessing under normal conditions the ECU is able to self adjust and keep everything smooth.   Right now my best performance is happening by lowering the base map just enough to where the ECU us doing short term cut of about 45% to reach the target Lambda of 14.7.  That way when I start putting load on it still has high enough fuel map to not be so lean.  After 2500 rpm I raised the base map to what would be really rich at no load, but still helps with the lean spots on load.  I figure I don't have much reason to be above 2500rpm with no load.  When watching other videos it seems their target is reached much faster than mine.  Mine takes forever to adjust and reach the target. My next few days will be spent making sure timing is good, it was running fine before doing the ECU and DBW swap, but want to verify.  I'll also probably swap in the new injectors I bought as well as a walbro 255 pump.  
×
×
  • Create New...