Sudden loss of grunt - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

johnfdove · 28th December 2001, 09:17 PM

I have just fitted a Blitz Nur R Exhaust to my GTS and am suffering a distinct lack of go. The surge that came in at about 4500 now happens at about 6000rpm + and it seems flat through the range. As the revs increase it starts to go and then seems to go flat, the whole process then starts again.

Has anyone suffered the same problem? I'm at a loss andd slightly pissed off.

John

Driftaholic · 28th December 2001, 10:25 PM

I seem to remember you telling me you had boost and air/fuel controllers? Maybe time to change plugs and get a remap? Call Nana at Option ask see what he thinks. They're at Silverstone, so only a 5 minute drive for you! 01327 858555

James

johnfdove · 28th December 2001, 10:28 PM

Just got boost control. No difference with it switched out though.

I'm just wondering if the fact that I changed the battery at the same time might just have some significance as it would have reset the ecu.

John

gary · 28th December 2001, 10:54 PM

check to see what your new boost level is with the improved flow from the exhaust you are probably overboosting and the ecu is cutting back
gary

5zuk · 1st January 2002, 06:31 PM

Yeah John i am having the same problem, ive got a downpipe, decat,and cat back system and induction kit+abbey ecu.My car has the same lack of mid range anybody got any idea as to what parts i need to fit to cure the problem?

johnfdove · 2nd January 2002, 03:37 AM

Did you have all mods done at once, or bit by bit?

My trouble only started after the exhaust was replaced from the cat bypass back which would point to drop in back pressure.

Have you spoken to Tony about it? The car is due a service and I was thinking of taking it down to Abbey but won't if there isn't anything they can do.

The car goes better with the removable baffle in the exhaust.

It's very dissapointing to have parted with around 600 squid for a reduction in performance.

Talat · 2nd January 2002, 12:24 PM

Just to add further confusion, when I bought my standard GTS-T, the first round of mods included the following:

Apex induction kit, Trust MX front pipe, Trust TR Power Evolution exhaust and HKS Iridium Plugs. The Trust exhaust was non-Jasma and hence bolted directly to the front pipe and hence the CAT was junked. Pipework from turbo back was 80mm=>95mm=> 130mm tailpipe (I think).

The results were very impressive as performance was much improved, never experienced any probs with torque loss.

Talat.

28th December 2001, 09:17 PM	#1 (permalink)
johnfdove GTR Register Member Join Date: Jul 2001 Location: Near Silverstone Posts: 18	Sudden loss of grunt I have just fitted a Blitz Nur R Exhaust to my GTS and am suffering a distinct lack of go. The surge that came in at about 4500 now happens at about 6000rpm + and it seems flat through the range. As the revs increase it starts to go and then seems to go flat, the whole process then starts again. Has anyone suffered the same problem? I'm at a loss andd slightly pissed off. John

28th December 2001, 10:25 PM	#2 (permalink)
Driftaholic GTR Register Member Join Date: Nov 2001 Location: Nagoya Posts: 506	Maybe time for a remap I seem to remember you telling me you had boost and air/fuel controllers? Maybe time to change plugs and get a remap? Call Nana at Option ask see what he thinks. They're at Silverstone, so only a 5 minute drive for you! 01327 858555 James

28th December 2001, 10:54 PM	#4 (permalink)
gary GTR Register Member Join Date: Aug 2001 Location: UK Posts: 1,363	boost check to see what your new boost level is with the improved flow from the exhaust you are probably overboosting and the ecu is cutting back gary

1st January 2002, 06:31 PM	#5 (permalink)
5zuk GTR Register Member Join Date: Sep 2001 Location: " Posts: 48	Same prob. Yeah John i am having the same problem, ive got a downpipe, decat,and cat back system and induction kit+abbey ecu.My car has the same lack of mid range anybody got any idea as to what parts i need to fit to cure the problem?

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28th December 2001, 10:28 PM	#3 (permalink)
johnfdove GTR Register Member Join Date: Jul 2001 Location: Near Silverstone Posts: 18	Just got boost control. No difference with it switched out though. I'm just wondering if the fact that I changed the battery at the same time might just have some significance as it would have reset the ecu. John

2nd January 2002, 03:37 AM	#6 (permalink)
johnfdove GTR Register Member Join Date: Jul 2001 Location: Near Silverstone Posts: 18	Did you have all mods done at once, or bit by bit? My trouble only started after the exhaust was replaced from the cat bypass back which would point to drop in back pressure. Have you spoken to Tony about it? The car is due a service and I was thinking of taking it down to Abbey but won't if there isn't anything they can do. The car goes better with the removable baffle in the exhaust. It's very dissapointing to have parted with around 600 squid for a reduction in performance.

2nd January 2002, 12:24 PM	#7 (permalink)
Talat GTR Register Member Join Date: Jun 2001 Location: Dirty South Posts: 610	Just to add further confusion, when I bought my standard GTS-T, the first round of mods included the following: Apex induction kit, Trust MX front pipe, Trust TR Power Evolution exhaust and HKS Iridium Plugs. The Trust exhaust was non-Jasma and hence bolted directly to the front pipe and hence the CAT was junked. Pipework from turbo back was 80mm=>95mm=> 130mm tailpipe (I think). The results were very impressive as performance was much improved, never experienced any probs with torque loss. Talat.