Have I Maxxed It!!! - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Draxx · 24th September 2002, 08:50 AM

My car has just stopped........

Running 1.1. Bar boost Max, just fitted an ARC Induction Box and the car goes like shit untill 4 thousand revs then stops......

Me thinks Ive Maxed the Air flow meter and the ECU, what options do I have here?

MMMMMM Gonna Cry I think, but at least the cars OK!!! I suppose I could Turn down the Boost but whats best Induction or Boost???

If I turn the boost down, will the air induction compensate for the loss of power or what???

Thanks

SI

Simon · 24th September 2002, 09:08 AM

Does it always cut off at 4000rpm or just when it's under load (i.,e. on boost)?

If it always cuts out at 4k then it sounds like you car is in 'limp home' mode. Is your check engine light not lit?

Is it possible you damaged the AFM while fitting the airbox?

If it's only underload, then it sounds like the ECU fuel cut caused by your car boosting of certain level. Do you have the standard ECU?

Anyone know at what boost the ECU cuts ignition on a GTST?

Draxx · 24th September 2002, 09:12 AM

Yeah Simon Its only when its under load, IE My Foots to the floor

Reckon it is my ECU, dunno though.

Oh And yeah it is the Standard ECU

Si

Simon · 24th September 2002, 09:25 AM

It's almost definately the ECU boost cut then. How are you controlling the boost? Bleed valve, boost controller?

R2CH · 24th September 2002, 09:39 AM

Had a simmilar problem on my GTS25T, having checked the plugs bla bla it turned out to be the ignition amplifier (some call it module). It could also be that the fuel cut is kicking in on high boost, look into a fuel cut defender.

I replaced the amp and installed a defender and now it runs like a dream.

Richard

Rich J · 24th September 2002, 10:20 AM

I'd say at 1.1 bar on a standard ecu its the fuel cut coming in as Simon said, on the R33 i think its 1bar or 1.1 bar when it kicks in. Could be under loading its spiking to an even higher bar limit. Turn it down and see what happens.

Draxx · 24th September 2002, 07:27 PM

Did a little experiment and put the standard air box with a HKS Super Panel in it, and it goes well at 1.1bar (1.1 is the max level, the so called spike, it levels to around 1) with the Induction kit in I have to turn the boost down to .7ish to stop it cutting out. The car does seem to run quicker with more boost, so what I need to do is stop it cutting out at 1.1 with the induction kit, giving me tremendous 0-60 times I reckon......

My question is, will a fuel cut defender solve the fuel problem?

What are my options as regarding ecus, dont want to spend 750 quid on a power fc, after all its not a GTR, and Im not that rich!!!!

Si

24th September 2002, 08:50 AM	#1 (permalink)
Draxx GTR Register Member Join Date: Mar 2002 Location: Staffordshire Moorlands Posts: 900	Have I Maxxed It!!! My car has just stopped........ Running 1.1. Bar boost Max, just fitted an ARC Induction Box and the car goes like shit untill 4 thousand revs then stops...... Me thinks Ive Maxed the Air flow meter and the ECU, what options do I have here? MMMMMM Gonna Cry I think, but at least the cars OK!!! I suppose I could Turn down the Boost but whats best Induction or Boost??? If I turn the boost down, will the air induction compensate for the loss of power or what??? Thanks SI

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24th September 2002, 09:08 AM	#2 (permalink)
Simon GTR Register Member Join Date: Feb 2002 Location: Doncaster Posts: 515	Does it always cut off at 4000rpm or just when it's under load (i.,e. on boost)? If it always cuts out at 4k then it sounds like you car is in 'limp home' mode. Is your check engine light not lit? Is it possible you damaged the AFM while fitting the airbox? If it's only underload, then it sounds like the ECU fuel cut caused by your car boosting of certain level. Do you have the standard ECU? Anyone know at what boost the ECU cuts ignition on a GTST?

24th September 2002, 09:12 AM	#3 (permalink)
Draxx GTR Register Member Join Date: Mar 2002 Location: Staffordshire Moorlands Posts: 900	Yeah Simon Its only when its under load, IE My Foots to the floor Reckon it is my ECU, dunno though. Oh And yeah it is the Standard ECU Si

24th September 2002, 09:25 AM	#4 (permalink)
Simon GTR Register Member Join Date: Feb 2002 Location: Doncaster Posts: 515	It's almost definately the ECU boost cut then. How are you controlling the boost? Bleed valve, boost controller?

24th September 2002, 09:39 AM	#5 (permalink)
R2CH GTR Register Member Join Date: May 2002 Location: Tunbridge Wells Posts: 70	Had a simmilar problem on my GTS25T, having checked the plugs bla bla it turned out to be the ignition amplifier (some call it module). It could also be that the fuel cut is kicking in on high boost, look into a fuel cut defender. I replaced the amp and installed a defender and now it runs like a dream. Richard

24th September 2002, 10:20 AM	#6 (permalink)
Rich J GTR Register Member Join Date: Jul 2001 Location: Cheshire Posts: 865	I'd say at 1.1 bar on a standard ecu its the fuel cut coming in as Simon said, on the R33 i think its 1bar or 1.1 bar when it kicks in. Could be under loading its spiking to an even higher bar limit. Turn it down and see what happens.

24th September 2002, 07:27 PM	#7 (permalink)
Draxx GTR Register Member Join Date: Mar 2002 Location: Staffordshire Moorlands Posts: 900	Did a little experiment and put the standard air box with a HKS Super Panel in it, and it goes well at 1.1bar (1.1 is the max level, the so called spike, it levels to around 1) with the Induction kit in I have to turn the boost down to .7ish to stop it cutting out. The car does seem to run quicker with more boost, so what I need to do is stop it cutting out at 1.1 with the induction kit, giving me tremendous 0-60 times I reckon...... My question is, will a fuel cut defender solve the fuel problem? What are my options as regarding ecus, dont want to spend 750 quid on a power fc, after all its not a GTR, and Im not that rich!!!! Si