So I tried FFS today. 1-2 ripped a nice bark. 2-3 didnt chirp,...but I got a quick 'whooosh' sound. Almost BOV in sound. Tried 2-3 again,...same sound. Is this normal?


Thanks.

 

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So from my research, maybe its my belts slipping momenterily?

 

Its the bypass which is normal take it up closer to redline and you wont hear it

 

That's what I was thinking... But I wasn't sure. What's a bypass?

 

That's what I thought it was and sounded like.

 

FFS? Doesn't that mean "for ****'s sake"? lol. You only have 3/10 of a second to NLS (no-lift-shift), just work on your shifting and you won't hear the whoosh sound anymore.

 

not true, i do nls good and i always hear it. hasent this been explained already?? the woosh sound is the backfire that keeps the turbo spooled.

 

The sound from the exhaust wouldn't be a whoooosh sound, it's a burp in the exhaust. Whoosh sound is and always will be described as the sound that the stock bpv makes or aftermarket bov. If you hear the bpv when NLS, guess what? you're not shifting fast enough /end thread.

 

have u ever done a nls? cause when u do one, there is a sound, comeing from under the car by the shifter, that sounds like blow off, but different, like sshhhhht. it is not the bpv, its the backfire. it does it in every nls. it sound different from bpv and comes from diff location. there have been meny posts on this. And i know its not the blow off cause i watched my boost gauge when i did nls and heard the sound, lost no boost, so how can it be the bpv if i loose no boost??

why dont u go out and do a nls in a higher gear say 3-4th and listen, then come tell me u didnt hear it.

 

sorry man, I see what you're saying. I thought you were implying the bpv sound was normal during NLS. I refer to the NLS sound as "burp" I'm a little country if you can't tell.

 

"I think I can clear this whole Pamm/ Pann issue." -Will Farrell 'Stepbrothers'

Okay you in fact do hear two noises. the pssshhht IS the BPV shooting charged air back into the intake through the breather hose. The cars stock tune setup is designed for that... when you go to an atmospheric BOV and that extra shot of air back into the intake is no longer there, you will get a rich condition that causes a backfire.

The other noise you can hear (not all the time, or everytime) is a small backfire that makes a "PoP" noise. thats coming from your exhaust. without a cat, u will see a small flame, blue or yellow. That pop usually means you did the NLS at the right rpm. time is not limited to 3/10's of a second. I think you have more time then that. lol. its at least 1.5 seconds.

NLS will keep the motor revved up to redline without cutting fuel for a limited time, its not 3/10s a second. NLS is designed to keep boost up so when you get into your next gear your experiencing the fullest amount of power your car can do at the beginning of the next shift.

if you hear multiple pops, that means you waited toooo long to get into the next gear. it will sound like a burst fire of rounds from a m16a assault rifle or something, lol.

there you have it, lol.

Oh that statement is soo not true.... do the NLS before you get to the perfect rpm and you will hear that noise everytime no matter what. from 3rd gear at 4500rpms, do a NLS into 4th gear. amazingly you will hear that noise louder than ever because you should being using that much charged air that early in the rpm.

 

ahh i see, well lets clear it up for him then, if he hears a woosh he is not shifting right, if he hears a ffffftt, its nls shound and normal.

 

3/10 of a second is what car and driver said, I figured they be right but who knows. 1.5 sec? That seems like way too much. Car and driver said you have 3/10 sec to correctly NLS and that their best driver could do it in half that so .15 sec. I'm not trying to argue, just stating what I read and what I notice when I NLS.

 

I've seen That info in at least 4 places .3 seams to be correct. If you watch your boost when nls and take to long (if say no longer than half a second) you will notice your boost start to fall. It will still have some boost but it's no longer maxing out. It won't be completely noticeable to well after a second. So if you shift slow it may look as if you held your boost but you will feel/ hear the difference between perfect and a little slow on the draw. I nice little pop and solid continued excelleration would be correct. The whoosh you start to hear would imply your slow and that's the factory bov purging charged air it will also feel like it falters a bit and bogs slightly acceration won't feel as continuous as your turbo will have to build some boost to max out again.

 

Why is it that when i NLS my boost drops. it never stays at 15psi. usualy goes down to like 10

 

My guess would be you're not shifting quite fast enough. Sometimes I get a little anxious when NLSing and I see the boost drop a little too or bounce off the rev limiter which clearly means I didn't do it fast enough.

Thanks slap, that's the point I was trying to get across earlier, I'm not so good with words sometimes.