EGT Removal??? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

NigelR32 · 9th August 2006, 08:09 PM

I've just fitted a decat and Downpipes to my R32 GTR, and my boost has dropped from .9 bar to .7??? I disconnected the EGT connector under the passenger seat.

I've also fitted some known good standard dump valves to try and cure the misfiring issue I've been getting.

The car no longer misfires (Fingers Crossed), but only reaches .7 bar max boost????

Any ideas???

tweenierob · 9th August 2006, 09:48 PM

The sensor is just a CAT ON FIRE sensor and is only used to light the warning on the dash, if you disconnect it all that will happen is the light wont come on.

Rob

Hugh Keir · 10th August 2006, 12:11 PM

You have changed the ehaust back pressure by fitting the de-cat.

You will need to modify your boost control system to get your boost back

You should really involve a tuner to make sure you dont push your engine too hard with the wrong air / fuel ratio.

SIHethers · 10th August 2006, 04:14 PM

Try reconnecting the cat sensor, just in case it has gone into "limp-home" mode as a result of removal. Not sure if this exists on Skylines but could explain actuator boost if it does.

Hugh, would lower backpressure not result in overboost and unstable boost rather than limited boost?

9th August 2006, 08:09 PM	#1 (permalink)
NigelR32 GTR Register Member Join Date: Jul 2002 Location: RB26ville Posts: 916	EGT Removal??? I've just fitted a decat and Downpipes to my R32 GTR, and my boost has dropped from .9 bar to .7??? I disconnected the EGT connector under the passenger seat. I've also fitted some known good standard dump valves to try and cure the misfiring issue I've been getting. The car no longer misfires (Fingers Crossed), but only reaches .7 bar max boost???? Any ideas??? __________________ Nigel...........GTROC Member Now on '32GTR No.3

9th August 2006, 09:48 PM	#2 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,838	The sensor is just a CAT ON FIRE sensor and is only used to light the warning on the dash, if you disconnect it all that will happen is the light wont come on. 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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10th August 2006, 12:11 PM	#3 (permalink)
Hugh Keir GTR Register Member Join Date: Jul 2001 Location: Aberdeen Scotland Posts: 1,545	You have changed the ehaust back pressure by fitting the de-cat. You will need to modify your boost control system to get your boost back You should really involve a tuner to make sure you dont push your engine too hard with the wrong air / fuel ratio.

10th August 2006, 04:14 PM	#4 (permalink)
SIHethers New Users Join Date: Feb 2006 Location: Newcastle Posts: 193	Try reconnecting the cat sensor, just in case it has gone into "limp-home" mode as a result of removal. Not sure if this exists on Skylines but could explain actuator boost if it does. Hugh, would lower backpressure not result in overboost and unstable boost rather than limited boost?