Suspension/engine Noises

[iamhe77]

Couldn't find air filters on their site?

found these: http://www.nengun.com/nismo/s-tune-sports-air-filter

Which is the correct part number? And How long do they last?

The K&N ones supposedly last 50k km???

Give them a call, they may have some in stock.

The Amsoil ones are guaranteed to last "100,000 miles or 4 years" - I have to back that as I am still using mine no probs

Re: Nismo air filter (from the RHD Japan website)

"The NISMO S-Tune Air Filter is a direct drop in replacement for your OEM unit and has a urethane/foam composition which will allow for the increased performance."

That fart sound from the stock blow off valve is embarassing. Especially if you've got chicks in the car

From outside they look at the car and it looks like it's new but little do they know when you boost a bit, it poos in it's pants.

hmm... I don't get any kind of noise from my factory BOV, even at 1.3 bar there are no such noises from the BOV

Turbo noise - but now I notice SOMETIMES (maybe 50%) when I hit boost, I get a "rubbing" noise - imagine driving over the rumble strips on the Hume, now speed it up x2. Sounds just like that...

Can you clarify whether the noise happens when you HIT boost or when you STEP OFF the accelerator whilst boosting?

Edited November 16, 2010 by iamhe77

[Sunkist]

I don't suggest it, mine holds 22 psi just fine. I drove Aarons with an aftermarket bov and wasn't impressed. Sorry Aaron.

Thanks Scott

lol yeh wouldnt recomend going after market. Regret it, and im lucky to have found a stock one (thats right scott! a stock one)

blocking it makes that "stuuu tuu tuu tu" sound. This will either snap the shaft in your turbo or shatter ceramic fan on the back of it. whichever is weaker, try to force exhaust fumes back into your engine, and do the ripple strip sound which is uncomfortable.

i had an atmo and needed to put the strongest spring i could get. our vacuum rate is much higher in our cars because they are electronically times, as compare to older cars. I did it just for kicks. found me kicking myself having to spend an arm and a leg repairing(hi flowing) a turbo.

because of the above reason, u could imagine why the stock would be the best.

[ironpaw]

OK - so basically my car's BOV is partially or fully blocked. Which means its stuffed and I need a stock replacement. You can't "clean" them, can you?

If I need a replacement - is it easier to get it from Japan? or order from Nissan Australia?

Something like this would be crap?

http://www.nengun.com/hks/super-sqv-3

Edited November 17, 2010 by ironpaw

[Sunkist]

OK - so basically my car's BOV is partially or fully blocked. Which means its stuffed and I need a stock replacement. You can't "clean" them, can you?

If I need a replacement - is it easier to get it from Japan? or order from Nissan Australia?

well i wouldnt suggest pulling them apart.

an idea? what im doing temporarily is using a Turbo Smart plumb back replacement for our car. it comes with a "green"(mid) tension spring. but its not soft enough.

Theyre "blue"(low) tensioned spring is the go. BOV should stay open at idle( which it does now) and should easily blow open when releasing throttle becuase of the softest spring. rated up to 600hp i think as well.. mine is still the green spring, and just BARELY making a beep sound. im not gonna get the blue spring because i found a stock. but I guess it would work. simple bolt on aswell. i think your looking at $200.00 RRP?

like i said ATMO isnt reccomended because of the Vacuum rate. Super sequential Valve by HKS is good but i wouldnt get it for ours, i tried one n my engine kept dying off throttle as the spring isnt strong enough. Probably wont fit under the BOV bracket aswell where as the TurboSmart Kompact fits just as a stck one.

oh n sorry for the long post's, I like to explain things in full

Edited November 17, 2010 by AaronNM35

[ironpaw]

well i wouldnt suggest pulling them apart.

an idea? what im doing temporarily is using a Turbo Smart plumb back replacement for our car. it comes with a "green"(mid) tension spring. but its not soft enough.

Theyre "blue"(low) tensioned spring is the go. BOV should stay open at idle( which it does now) and should easily blow open when releasing throttle becuase of the softest spring. rated up to 600hp i think as well.. mine is still the green spring, and just BARELY making a beep sound. im not gonna get the blue spring because i found a stock. but I guess it would work. simple bolt on aswell. i think your looking at $200.00 RRP?

like i said ATMO isnt reccomended because of the Vacuum rate. Super sequential Valve by HKS is good but i wouldnt get it for ours, i tried one n my engine kept dying off throttle as the spring isnt strong enough. Probably wont fit under the BOV bracket aswell where as the TurboSmart Kompact fits just as a stck one.

oh n sorry for the long post's, I like to explain things in full

No problem - I like to get as much info as I can!

So I need to find a "blue" tensioned spring, which I take it is a stock part from Nissan?

I don't need the whole BOV assembly? Just this spring? Or I need this "Turbo Smart PLumb back" thing...? where do I get that?

Sorry for my newbness!!

[zei20l]

No, he said the TurboSmart blue spring, but it comes with a green one..........

[Sunkist]

No problem - I like to get as much info as I can!

So I need to find a "blue" tensioned spring, which I take it is a stock part from Nissan?

I don't need the whole BOV assembly? Just this spring? Or I need this "Turbo Smart PLumb back" thing...? where do I get that?

Sorry for my newbness!!

haha nah its ok. im still newbing it i guess..

you'll have to replace the whole blow off valve. i dont think the stock ones come apart.

before you do replace it though speak to scott because i remember him saying something about a grub screw in the stock one that made it surge.(dont ask me)

but.

http://www.turbosmartonline.com/index.php?id=46 explains it. scroll down abit till you see the black ones.. its model specific for Nissan, including "stagea - all models" which is bull shit.. lol you will need a blue spring. which is like $15.00

[scotty nm35]

Firstly, take the bov off and inspect it, Im guessing the hose is split or worse, there is some internal damage. There is probably a spare stockie floating about if you need one.

Our bov is special, it bypasses air all the time from a 4mm hole, this should not be blocked. (as I found the hard way) It helps eliminate compressor surge. Better would be to stick a solenoid on the bypass hole to block it at full throttle but as I said, I can hold good boost with it venting anyway.

[Sunkist]

thats why i said talk to scott lol

[dimi108]

The blow off valve smells like egg.

[ironpaw]

The blow off valve smells like egg.

???? what'd ya mean!?

So with the current BOV's farting sound - is this surging the compressor?

[zei20l]

nope, compressor surge sounds like a pigeon

[dimi108]

Hey Jethro, how is it going with the bov problem?

Sorted yet?

Keep me updated mate

[ironpaw]

Hey Jethro, how is it going with the bov problem?

Sorted yet?

Keep me updated mate

I should be getting the turbosmart thing from Aaron later this week...will let you know.

I think I will also start hunting for a used one on IM or from Jesse Streeter. Hey what did you mean when u said the BOV smells like egg? Are you kidding?

[wht510]

You wouldn't think of repairing the factory one? Sometimes all they need is a bit of a clean out. Kero bath and actuate it a couple of times and then you should be right?

The only other thing I can recommend is looking for boost leaks (such as cracked or damaged tubing on the pressure side of the engine.

Regardless, keep us in the loop on how you go.

[Sunkist]

hey everyone i had a look at it. its definitely not the BOV. its kind of like a quick brdrdurur sound like scraping something rippled with your hand. the BOV is fine. all the pipes are tightened. Driving it kind of feels like when you release the accelerator and the car kind of jerks forward its rubbing something for a split second then calms down. i think it might have something to actually do with handling rather than engine.

definitely not surge. i even tightened all the pipes.. def not leaking, doesn't seem possible to leak only when coming off boost right?

any ideas to help Mr IronPaw out?

[ironpaw]

Yep gotta thank Aaron for having a look at the issue...he reseated the BOV and tighted all the hoses but the farting noise remains...grrrrrrrrr

Might need to visit you Scotty..,when you guys are done with Craig's car that is

[iamhe77]

Can you clarify whether the noise happens when you HIT boost or when you STEP OFF the accelerator whilst boosting?

Did I miss the answer to this question?

[ironpaw]

Did I miss the answer to this question?

Hmm I get the noise when I let the accelerator off when I'm at (full?) boost between 3-4.5k. Doesn't happen ALL the time but usually does (70%). Never happens above 5k...

[scotty nm35]

Hmm I get the noise when I let the accelerator off when I'm at (full?) boost between 3-4.5k. Doesn't happen ALL the time but usually does (70%). Never happens above 5k...

Throttle butterfly ok? sounds like its surging but it wont with the stock bov, mine doesnt unless I block the bleed hole. Perhaps its blocked with gunk?