Help!!!! - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

TheD · 6th September 2008, 04:57 PM

Woke up this morning and drove my car as usual and noticed a lack of power on boosting.

It has been running really well up to this point and I don't have a clue what it could be!

The car is standard apart from induction and exhaust. Its had a new coil pack - just before I bought it. Have only had the car about two weeks.

There are no obvious noises from the engine to suggest need for a rebuild and as far as i can see no pipes have popped or are leaking.

Its running on BP Ultimate Unleaded. Its almost like the turbos aren't providing much power. They spool up but don't seem to be making a whole lot of difference.

Any ideas? Please!

archaeic_bloke · 6th September 2008, 05:15 PM

do you have an aftermarket boost controller installed? if so, check all the wiring to it, i had an A'pexi AVCr with loose wiring that when the wires to the display/control werent in the right place.. the car would defualt as a safety measure and means of protecting it self and FORCE the wastegates stuck open as to not run any boost... was a really frustrating problem and hard to find...

another thing i had experienced was the Boost pressure reader for the ECU itself.. if the little tube near your VIN plate isnt connected properlly to the pressure sensor... or if u have a leak in that tiny little vacuum line going to it.. this could also cause a problem, i would check those 2 things first.

m6beg · 6th September 2008, 05:15 PM

Sounds like a boost pipe off somewhere or an intercooler pipe off.

Mick

TheD · 6th September 2008, 05:20 PM

Thanks for quick responses guys. I have no boost controller fitted yet - am planning that tomorrow! Have just bought the new HKS EVC unit.

I have been thinking that perhaps it is a pipe or something simple rather than anything catastrophic. Will check these things these things tomorrow and report back my findings. If anyone can thing of any other possibilities then please suggest so I can check tomorrow. Its possible that all the rain we've been having has got in somewhere I suppose!

Out of interest what should the standard boost gauge in the centre console be reading on acceleration / idle etc.?

TheD

archaeic_bloke · 6th September 2008, 05:53 PM

well a little below zero on idle as theres negative pressure/vacuum... and it should rise to the maximum +0.7 bar on the boost gauge when accelerating past say 6k RPM

MIKEGTR · 6th September 2008, 08:28 PM

Sounds like a broken jubilee clip to me

TheD · 7th September 2008, 08:21 AM

Hmm, the boost sits nearer -7 than 0.

willrobdon · 7th September 2008, 08:30 AM

boost should be at -7 at idle and boost up when driving to positive pressure. Again to me it sounds like boost is escaping somewhere, check the BOV's arent stuck open causing boost to leak off.

TheD · 7th September 2008, 03:57 PM

Oh no! Checked all the pipes for leaks etc. Can't find anything. At idle the boost is about -6.5. The turbos spool up but the car doesn't seem to continue building in power past 5000 rpm.

I am now looking for the LEDs on the ECU in order to do fault diagnostics.

I have located the ecu in the passenger footwell BUT like the threads say there aren't any LEDs or a 'Diagnostic Screw' I have removed the ECU and found two holes in the back of it, but still no screw or LEDs inside?!?!

Where can I get the fault codes from!!!!

MIKEGTR · 7th September 2008, 04:16 PM

If no boost pipes are loose then i'd suspect a broken exhaust turbine wheel on one of the turbos

6th September 2008, 04:57 PM	#1 (permalink)
TheD GTROC Member Join Date: Aug 2008 Location: East Anglia - UK Posts: 341	Help!!!! Woke up this morning and drove my car as usual and noticed a lack of power on boosting. It has been running really well up to this point and I don't have a clue what it could be! The car is standard apart from induction and exhaust. Its had a new coil pack - just before I bought it. Have only had the car about two weeks. There are no obvious noises from the engine to suggest need for a rebuild and as far as i can see no pipes have popped or are leaking. Its running on BP Ultimate Unleaded. Its almost like the turbos aren't providing much power. They spool up but don't seem to be making a whole lot of difference. Any ideas? Please!

6th September 2008, 05:15 PM	#3 (permalink)
m6beg THE WHITE Join Date: Apr 2003 Location: TR RACING Posts: 4,456	Sounds like a boost pipe off somewhere or an intercooler pipe off. Mick __________________ TWEENIEROB @ TR RACING 8.21@176.65MPH European 4wd Record Holder OPIE OIL SERIOUS PERFORMANCE TURBODYNAMICS D-C-Y VP RACING FUELS

6th September 2008, 05:20 PM	#4 (permalink)
TheD GTROC Member Join Date: Aug 2008 Location: East Anglia - UK Posts: 341	Great Stuff: Thanks for quick responses guys. I have no boost controller fitted yet - am planning that tomorrow! Have just bought the new HKS EVC unit. I have been thinking that perhaps it is a pipe or something simple rather than anything catastrophic. Will check these things these things tomorrow and report back my findings. If anyone can thing of any other possibilities then please suggest so I can check tomorrow. Its possible that all the rain we've been having has got in somewhere I suppose! Out of interest what should the standard boost gauge in the centre console be reading on acceleration / idle etc.? TheD

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6th September 2008, 05:15 PM	#2 (permalink)
archaeic_bloke GTR Register Member Join Date: Apr 2008 Posts: 200	do you have an aftermarket boost controller installed? if so, check all the wiring to it, i had an A'pexi AVCr with loose wiring that when the wires to the display/control werent in the right place.. the car would defualt as a safety measure and means of protecting it self and FORCE the wastegates stuck open as to not run any boost... was a really frustrating problem and hard to find... another thing i had experienced was the Boost pressure reader for the ECU itself.. if the little tube near your VIN plate isnt connected properlly to the pressure sensor... or if u have a leak in that tiny little vacuum line going to it.. this could also cause a problem, i would check those 2 things first.

6th September 2008, 05:53 PM	#5 (permalink)
archaeic_bloke GTR Register Member Join Date: Apr 2008 Posts: 200	well a little below zero on idle as theres negative pressure/vacuum... and it should rise to the maximum +0.7 bar on the boost gauge when accelerating past say 6k RPM

6th September 2008, 08:28 PM	#6 (permalink)
MIKEGTR GTR Register Member Join Date: Jul 2005 Location: WICKFORD Posts: 482	Sounds like a broken jubilee clip to me

7th September 2008, 08:21 AM	#7 (permalink)
TheD GTROC Member Join Date: Aug 2008 Location: East Anglia - UK Posts: 341	Hmm, the boost sits nearer -7 than 0.

7th September 2008, 08:30 AM	#8 (permalink)
willrobdon New Users Join Date: Jul 2006 Location: Somerset Posts: 783	boost should be at -7 at idle and boost up when driving to positive pressure. Again to me it sounds like boost is escaping somewhere, check the BOV's arent stuck open causing boost to leak off.

7th September 2008, 03:57 PM	#9 (permalink)
TheD GTROC Member Join Date: Aug 2008 Location: East Anglia - UK Posts: 341	Oh no! Checked all the pipes for leaks etc. Can't find anything. At idle the boost is about -6.5. The turbos spool up but the car doesn't seem to continue building in power past 5000 rpm. I am now looking for the LEDs on the ECU in order to do fault diagnostics. I have located the ecu in the passenger footwell BUT like the threads say there aren't any LEDs or a 'Diagnostic Screw' I have removed the ECU and found two holes in the back of it, but still no screw or LEDs inside?!?! Where can I get the fault codes from!!!!

7th September 2008, 04:16 PM	#10 (permalink)
MIKEGTR GTR Register Member Join Date: Jul 2005 Location: WICKFORD Posts: 482	If no boost pipes are loose then i'd suspect a broken exhaust turbine wheel on one of the turbos