Could Apexi Induction cause this problem? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Jono & Emma · 22nd August 2006, 12:10 PM

Since I fitted an Apexi Induction kit to our R34 GTT, it seems to... well, it don't feel right.

The only way I can describe it is that it feels like it's stuttering it's way up the revs when you boot it. The power comes and goes completely randomly. I've also noticed that take-off speed is suffering and I'm convinced that fuel economy has plumeted.

So here's my theory based on some stuff i've read... the increased airflow provided by the Apexi is telling the ECU to over-fuel in order to compensate and not run lean. As a result, the car's choking on it's own fuel? Resulting in crappy economy, jerky performance?

What do you think, could I be right?

If so, can you suggest a cheap solution? I heard if I put some Iridium plugs in there that could help?

Certainly can't afford any kind of ECU or power FC etc. and it would be a shame to get rid of the Apexi and go back to completely standard

Any thoughts/comments would be greatly appreciated!

Mookistar · 22nd August 2006, 12:13 PM

erm, this may not be the same problem, but i had new elbows and steel turbo's fitted yesterday, and the improved flow has caused a small misfire at low RPM.

the solution is a power FC, but in the meantime, disconnecting the lambda's has cured it

fuel consumption might increase, but rich is better than lean

maybe the same issue?

mook

Jono & Emma · 23rd August 2006, 07:40 AM

May be a similar problem I guess yeah. Does the car run with lambda's disconnected? I'd have thought the computer would say n'ah?

stealth · 23rd August 2006, 08:12 AM

Had a GTT for nearly 2 years ,stage 1 mods ,whats your set up ,? just Airfilter ,have you standard exhaust,you running with a cat ,downpipes standard etc.If you have a problem and it is the filter it will be worse when it's colder .Always found slightly modded GTT's bit unpredictable ,set up needs to be spot on .Plugs, coils packs ,fuel filter ,2 stage boost problems ,is it mainly at about 5000 revs when you floor it?

JasonO · 23rd August 2006, 09:02 AM

Rather than being rich, it's likely lean and the ecu is retarding the ignition due to detecting knock.

Have the fueling checked, before you damage it.

Jono & Emma · 23rd August 2006, 11:40 AM

Erm - I don't like the sound of that

Who's this a job for? Abbey?

Stealth - exactly that mate, running everything completely standard bar the Apexi. The problems actually feel more like sub 5000 revs actually, the power seems to kick in properly about then.

Thinking I may have to put the standard setup back in at this rate - it's not worth spending anything on when the Apexi only cost a few quid and doesn't have a positive effect anyway (without further mods).

Jono & Emma · 23rd August 2006, 02:03 PM

Would something like this help me to diagnose the fault???

http://www.plmsdevelopments.com/consult_if.shtml

Jono & Emma · 24th August 2006, 09:19 AM

Would it?

Abbey M/S · 24th August 2006, 09:43 AM

Jono/Emma

Sounds like a AFM fault or maybe a dodgy Lambda.

Quote:

the solution is a power FC, but in the meantime, disconnecting the lambda's has cured it

cars is limp home now, far to rich ....imho. who said do this then?

Mookistar · 24th August 2006, 12:11 PM

Quote:

Originally Posted by Abbey M/S

cars is limp home now, far to rich ....imho. who said do this then?

Ron at RK

It' was running a 1 bar abbey setup, before i changed the turbo's and elbows for steel internals and HKS elbows. Thats what created the misfire, and although a powerFC is the ideal solution, disconnecting the lambda's has stopped the mis, he said it would run rich, but would be ok to drive to Germany next week!

now you've got me worried....

mook

Jono & Emma · 25th August 2006, 08:54 AM

Cheers Abbey - next step was gonna be to give you guys a call actually so I'm glad you responded. This could well be the case, as the connector to the AFM was hastily wired together by me using some pretty shite materials. Think I'll take it somewhere to have that wired up properly and see if that makes a difference. Cheers everyone

Scott · 25th August 2006, 07:02 PM

Quote:

Originally Posted by Abbey M/S

Jono/Emma

Sounds like a AFM fault or maybe a dodgy Lambda.

cars is limp home now, far to rich ....imho. who said do this then?

Ditto what Mark says, but as Apexi's are a dry filter so AFM contamination
couldn't be caused by filter. As for flow, the restriction is only slightly less the
a std box and flow would be unchanged really, besides ecu should be able to
compensate.

Get it checked ASAP!

Jono & Emma · 29th September 2006, 11:35 AM

Massively late response but I'm posting the resolution in case anyone searches for this thread in future.

It was indeed my shoddy wiring of the plug to the AFM. I'd wired using bullet connectors (all I had when I was doing the job). On removing these it was clear that wires had come loose and were hardly making contact

Oops!

Anyway... got a mate to solder the connections instead so it's all hard wired now and is performing perfectly, as it should!

Thanks to all for your hypothesiseses

Scott · 29th September 2006, 05:18 PM

Glad to hear its all sorted!

GTRSTILL · 2nd October 2006, 03:45 PM

Filter oil on the AFM sensor???

I had a look at an Apexi filter that my brother had and it had been overoiled.

22nd August 2006, 12:10 PM	#1 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Could Apexi Induction cause this problem? Since I fitted an Apexi Induction kit to our R34 GTT, it seems to... well, it don't feel right. The only way I can describe it is that it feels like it's stuttering it's way up the revs when you boot it. The power comes and goes completely randomly. I've also noticed that take-off speed is suffering and I'm convinced that fuel economy has plumeted. So here's my theory based on some stuff i've read... the increased airflow provided by the Apexi is telling the ECU to over-fuel in order to compensate and not run lean. As a result, the car's choking on it's own fuel? Resulting in crappy economy, jerky performance? What do you think, could I be right? If so, can you suggest a cheap solution? I heard if I put some Iridium plugs in there that could help? Certainly can't afford any kind of ECU or power FC etc. and it would be a shame to get rid of the Apexi and go back to completely standard Any thoughts/comments would be greatly appreciated!

22nd August 2006, 12:13 PM	#2 (permalink)
Mookistar ADMINISTRATOR Join Date: Feb 2004 Location: Living life 8min 50 secs at a time Posts: 10,407	erm, this may not be the same problem, but i had new elbows and steel turbo's fitted yesterday, and the improved flow has caused a small misfire at low RPM. the solution is a power FC, but in the meantime, disconnecting the lambda's has cured it fuel consumption might increase, but rich is better than lean maybe the same issue? mook __________________ FOR ALL GTR FORUM RELATED ISSUES CONTACT THE ADMIN TEAM 'MOOKISTAR' OR 'MOLEMAN' SKYLINE FAQ'S!

23rd August 2006, 09:02 AM	#5 (permalink)
JasonO GTR Register Member Join Date: Jun 2001 Location: Here, to stay. Posts: 7,287	Rather than being rich, it's likely lean and the ecu is retarding the ignition due to detecting knock. Have the fueling checked, before you damage it. __________________ Expired.... [E&OE.....]

23rd August 2006, 11:40 AM	#6 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Erm - I don't like the sound of that Who's this a job for? Abbey? Stealth - exactly that mate, running everything completely standard bar the Apexi. The problems actually feel more like sub 5000 revs actually, the power seems to kick in properly about then. Thinking I may have to put the standard setup back in at this rate - it's not worth spending anything on when the Apexi only cost a few quid and doesn't have a positive effect anyway (without further mods). Last edited by Jono & Emma; 23rd August 2006 at 11:43 AM.

29th September 2006, 05:18 PM	#14 (permalink)
Scott GTROC Board Member Join Date: Jun 2001 Location: at 'ome Posts: 5,731	Glad to hear its all sorted! __________________ Regards, Scott. GTROC Members Secretary. Please feel free to PM me with any GTROC Membership or Merchandising issues. OO SKYLINE OO My R32's full restoration: http://www.gtr.co.uk/forum/upload/77...ht=restoration

23rd August 2006, 07:40 AM	#3 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	May be a similar problem I guess yeah. Does the car run with lambda's disconnected? I'd have thought the computer would say n'ah?

23rd August 2006, 08:12 AM	#4 (permalink)
stealth New Users Join Date: Jul 2004 Location: somewhere over the rainbow ( not far from Jeff ) Posts: 3,302	Had a GTT for nearly 2 years ,stage 1 mods ,whats your set up ,? just Airfilter ,have you standard exhaust,you running with a cat ,downpipes standard etc.If you have a problem and it is the filter it will be worse when it's colder .Always found slightly modded GTT's bit unpredictable ,set up needs to be spot on .Plugs, coils packs ,fuel filter ,2 stage boost problems ,is it mainly at about 5000 revs when you floor it?

23rd August 2006, 02:03 PM	#7 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Would something like this help me to diagnose the fault??? http://www.plmsdevelopments.com/consult_if.shtml

24th August 2006, 09:19 AM	#8 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Would it?

25th August 2006, 08:54 AM	#11 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Cheers Abbey - next step was gonna be to give you guys a call actually so I'm glad you responded. This could well be the case, as the connector to the AFM was hastily wired together by me using some pretty shite materials. Think I'll take it somewhere to have that wired up properly and see if that makes a difference. Cheers everyone

29th September 2006, 11:35 AM	#13 (permalink)
Jono & Emma GTR Register Member Join Date: Apr 2006 Location: Oxfordshire Posts: 126	Massively late response but I'm posting the resolution in case anyone searches for this thread in future. It was indeed my shoddy wiring of the plug to the AFM. I'd wired using bullet connectors (all I had when I was doing the job). On removing these it was clear that wires had come loose and were hardly making contact Oops! Anyway... got a mate to solder the connections instead so it's all hard wired now and is performing perfectly, as it should! Thanks to all for your hypothesiseses

2nd October 2006, 03:45 PM	#15 (permalink)
GTRSTILL GTR Register Member Join Date: Jul 2006 Posts: 1,538	Filter oil on the AFM sensor??? I had a look at an Apexi filter that my brother had and it had been overoiled.

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