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M35 Strange Exhaust Noise

fezmo

By fezmo,
in Four Door Family & Wagoneers

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iamhe77 Grand Master

iamhe77

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Well I spoke to Jetwrek and he mentioned it may be the Air filter... I changed up to a K&N filter and I can't get it to fart anymore..... I'm totally confused. :)

May have something to do with getting enough air to the turbo.

Glad Craig could help :D

hmm... that description actually reminds me of the sound my car used to make (same circumstances).

Got rid of it by allowing more air to the turbo (Powerduct and intake piping).

I was told it was the same sound that GTR's make when they suck their rubber pipe shut, thus not enough air getting to he turbo.

Haven't had the sound since. :down:

Dunno about all this talk of the factory BOV problems, both Scotty and Craig are still using their stock BOV's and each have over 200awkw.

I am still using my stock BOV without issue and I have just turned 180,000kms on my car that regularly boosts to 1.2 bar.

Also, maybe look at putting a small grub screw in the little hole of your BOV. :D

Yup, that is the exact same sound I had.

I still had it happen when I put the grub screw in the stock BOV, it was when we put the intake pipe on that the sound disappeared completely.

Check that your air filter is clean and that it is a high flowing item? Open the front of the airbox?

These should help and are a cheap solution... but like I said, my car stopped making that noise ONLY after opening up the intake pipe (I still have the stock intercooler... for now).

:(

Daleo Grand Master

Daleo

Posted
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I was AMAZED at the difference fitting a K&N filter, there is obviously a huuuge difference in airflow over a std paper filter. I would compare the improvement in performance to the equivalent of the addition of the 3 inch dump to my otherwise standard exhaust. It was a night and day improvement.

scotty nm35 Grand Master

scotty nm35

Posted
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If the noise you are hearing is the compressor trying to create a vacuum you may have been damaging it or the bearings. I didn't hear any strange noises from my intake before I made the 80mm one but it was definitely maxed out at 200kw. Nissan obviously used this as one of the many ways it limits the torque for drivetrain protection.

fezmo Explorer

fezmo

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Just to add some more confusion to the topic...

I already had a powerduct and Blitz high flow panel filter and was getting the farting noise.

Installed the new BOV (factory Nissan one) today and no more farting! Driven it for about an hour and all seems fine!

See what happens over the next few days but it seems it was the BOV in my case

Bis-e Bee Mentor

Bis-e Bee

Posted
Posted
Can you guys puhleeeeeez stop pointing towards Turbosmart stuff as a suitable solution?

I've noticed you obviously have something up with TS, wat's the prob bob?

Bis-e Bee Mentor

Bis-e Bee

Posted
Posted
They are over priced crap?

Nah he would have said that if that's what he thought, he hinted that it is NOT a suitable solution.

Just wondering why he believes that is the case.

spoolin12 Collaborator

spoolin12

Posted
Posted

I am just totally confused to why blocking off my BOV would stop the farting and would also stop with a better filter... Maybe it comes down to my lack of knowledge but it just seems odd. All I know is no farting = good.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Its easy, the stock bov has a 5 mm hole that bypasses all the time. This would require more air to circulate through the already restrictive intake.

Turbosmart bov is a simple air valve, well overpriced if you ask me. Our stock one is more than up to the task, if you want the noises block the bypass port with a grubscrew or for the hektic, blank the bugger off with some alloy sheet under the valve. Anything venting externally will send the ecu mental.

Turbosmart ball valve controllers are crap, Blitz spec R FTW. :whistling:

matty_M35 Collaborator

matty_M35

Posted
Posted

just picked up my m35 last monday.. i get this noise too.. heard it while driving into sydney the other night.. freaked me out thought something bad is wrong and i had bought a lemon. So hit the pedal again to listen for it once more nothing?? that was full boost through a couple of gears. but i get it when i feather the throttle as you guys have previously mentioned.

i will look into the remedies suggested.

i have a kakimoto cat back exhaust no aftermarket filter panel

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