SLIGHT DET AT 2K, ANY IDEAS??? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Ajax · 21st July 2005, 04:26 PM

Im getting slight detonation at 1800-2000rpm. It seems to happen when say im following someone at around 30mph and i then gently 'adjust' the throttle just to maintain this slow speed. no boost whatso ever obviously. At higher rpm or generaly booting it up through the box i dont get any det.

Any idea's guys?
Ive tried an ecu reset and using optimax with millers OB.
Would dirty AFM's cause this?
Thanks for any suggestions

skyline69_uk · 21st July 2005, 08:12 PM

How do you know it is det (is an Apexi fitted to show the knock)? Is it pinging etc?

Ajax · 21st July 2005, 08:26 PM

Hi m8, i hav'nt got an AFC so ive not got any indication of knock but it certainly sounds like very light dettonation. Anything above 2 grand it goes away/stops.
I cleaned the AFMs tonight, they were prety dirty. Yellow HKS filters at the moment and they let to much shite through. The slight 'ping' is still there though. I thought that the dirt on the AFMs would cause it to under read, but as i say its still there

I gota get some Apexi filters ASAP for a start.

NewClearBomb · 26th July 2005, 01:57 PM

first thing I would check is heatshields on your exhaust system, they can give funny metalic buzzy rattling at about 1800rpm if they're not all secured properly

tweenierob · 26th July 2005, 02:00 PM

i would be very suprised if you managed to get Det at 2k on a Gtr.

I reckon heat shields too..

Rob

Ajax · 26th July 2005, 03:55 PM

Thanks chaps, it does seem kinda odd to me too.
Il check all the heat sheilds then and have a good look round underneath.

21st July 2005, 04:26 PM	#1 (permalink)
Ajax GTR Register Member Join Date: Jun 2005 Location: Plymouth Posts: 420	SLIGHT DET AT 2K, ANY IDEAS??? Im getting slight detonation at 1800-2000rpm. It seems to happen when say im following someone at around 30mph and i then gently 'adjust' the throttle just to maintain this slow speed. no boost whatso ever obviously. At higher rpm or generaly booting it up through the box i dont get any det. Any idea's guys? Ive tried an ecu reset and using optimax with millers OB. Would dirty AFM's cause this? Thanks for any suggestions

21st July 2005, 08:12 PM	#2 (permalink)
skyline69_uk GTROC Member Join Date: Jan 2005 Location: NI Posts: 2,833	How do you know it is det (is an Apexi fitted to show the knock)? Is it pinging etc? __________________ Do it right or don't do it at all. "You're a pack of a**holes!" - Jim Richards 1992. スカイライン６９　UK

26th July 2005, 02:00 PM	#5 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,833	i would be very suprised if you managed to get Det at 2k on a Gtr. I reckon heat shields too.. Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

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21st July 2005, 08:26 PM	#3 (permalink)
Ajax GTR Register Member Join Date: Jun 2005 Location: Plymouth Posts: 420	Hi m8, i hav'nt got an AFC so ive not got any indication of knock but it certainly sounds like very light dettonation. Anything above 2 grand it goes away/stops. I cleaned the AFMs tonight, they were prety dirty. Yellow HKS filters at the moment and they let to much shite through. The slight 'ping' is still there though. I thought that the dirt on the AFMs would cause it to under read, but as i say its still there I gota get some Apexi filters ASAP for a start.

26th July 2005, 01:57 PM	#4 (permalink)
NewClearBomb GTR Register Member Join Date: Sep 2003 Location: Birmingham Posts: 74	first thing I would check is heatshields on your exhaust system, they can give funny metalic buzzy rattling at about 1800rpm if they're not all secured properly

26th July 2005, 03:55 PM	#6 (permalink)
Ajax GTR Register Member Join Date: Jun 2005 Location: Plymouth Posts: 420	Thanks chaps, it does seem kinda odd to me too. Il check all the heat sheilds then and have a good look round underneath.