Backfire - Skyline Owners Club

Spence · 28th October 2008, 08:15 AM

I have recently had a used HKS bov fitted and now when i change gear as i go into the next gear and let out the clutch there is a small back fire. I do have a japspeed exhaust and apex filter which the apexi afc has been mapped to accept.

Any ideas or just normal?

**ISJ** · 28th October 2008, 11:11 AM

Pretty much the norm. The BOV is letting out "metered" air that would normally be fed back into the engine in the normal re-circulating BOV set-up.

I suggest you just go for a re-tune at your local garage to make sure it isn't going silly on the fuelling. However, I don't think it will cause many problems as it will only be running slightly rich.

Spence · 28th October 2008, 09:21 PM

Quote:

Originally Posted by ISJ

Pretty much the norm. The BOV is letting out "metered" air that would normally be fed back into the engine in the normal re-circulating BOV set-up.

I suggest you just go for a re-tune at your local garage to make sure it isn't going silly on the fuelling. However, I don't think it will cause many problems as it will only be running slightly rich.

It is going in for mot so might get them to do another power run and tune!

I mean it isn't blowing flames as i would see the flash out the back! Might just being a little paranoid!

GouldyGTR · 28th October 2008, 11:36 PM

my 32 GTR does the same mate, mine seems to do it more if your are lighter with the throttle

Spence · 29th October 2008, 08:41 AM

Quote:

Originally Posted by GouldyGTR

my 32 GTR does the same mate, mine seems to do it more if your are lighter with the throttle

Your right! Why is it doing that?

monkfish · 29th October 2008, 02:50 PM

as far as im aware it will do this if its been de-cat'ed.....both my 33 gts-t's were the same and so is my tiptronic r34 gtt......as others have said perhaps check the fuelling is ok as standard pumps can die off slowly but if alls well there dont worry about it.

**ISJ** · 29th October 2008, 05:15 PM

Yeah enjoy it, I actually get flames out the back of mine - it runs a tad rich!

Spence · 29th October 2008, 07:49 PM

Quote:

Originally Posted by ISJ

Yeah enjoy it, I actually get flames out the back of mine - it runs a tad rich!

Not sure if getting flames now as it has not long been re mapped and has been matched to accept the filter and exhaust which was causing massive over fueling.

I just get a little worried when i fit something and it doesn't have a power run!

28th October 2008, 08:15 AM	#1
Spence Skyline Enthusiast Registered User Join Date: Sep 2008 Location: Gillingham, Dorset County: Dorset Drives: R33 Skyline GTS-T Posts: 63	Backfire I have recently had a used HKS bov fitted and now when i change gear as i go into the next gear and let out the clutch there is a small back fire. I do have a japspeed exhaust and apex filter which the apexi afc has been mapped to accept. Any ideas or just normal?

28th October 2008, 11:11 AM	#2
ISJ Floppy Member Area Rep Membership No. 352 Join Date: Jan 2006 Location: In a mysterious fantasy world County: West Midlands Drives: R33 GTST Posts: 2,484	Pretty much the norm. The BOV is letting out "metered" air that would normally be fed back into the engine in the normal re-circulating BOV set-up. I suggest you just go for a re-tune at your local garage to make sure it isn't going silly on the fuelling. However, I don't think it will cause many problems as it will only be running slightly rich.
	__________________ Cert 18 (TBC) May contain mild peril and references of a sexual nature. --------------

29th October 2008, 05:15 PM	#7
ISJ Floppy Member Area Rep Membership No. 352 Join Date: Jan 2006 Location: In a mysterious fantasy world County: West Midlands Drives: R33 GTST Posts: 2,484	Yeah enjoy it, I actually get flames out the back of mine - it runs a tad rich!
	__________________ Cert 18 (TBC) May contain mild peril and references of a sexual nature. --------------

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28th October 2008, 11:36 PM	#4
GouldyGTR Skyline Enthusiast Registered User Join Date: Oct 2008 Location: Carrot Crunching County: Somerset Drives: 1991 R32 GTR, Posts: 18	my 32 GTR does the same mate, mine seems to do it more if your are lighter with the throttle

29th October 2008, 02:50 PM	#6
monkfish Skyline Enthusiast Registered User Join Date: Nov 2006 Drives: R34 GTT Posts: 64	as far as im aware it will do this if its been de-cat'ed.....both my 33 gts-t's were the same and so is my tiptronic r34 gtt......as others have said perhaps check the fuelling is ok as standard pumps can die off slowly but if alls well there dont worry about it.

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