QuickSilver_SS

A few weeks ago I had a local member tune my car. I was GMS1 before. I got him to give me a very mild tune over gms1. I am only running 21 psi and only about 12 degrees of timing. The car works great and has a lot more power then before. At wot I am NOT getting or hearing any turbo flutter. But , if i am in a parking lot just slowly trolling along in 1st gear and at about 10 or 15mph and let off the gas. I hear a very faint turbo flutter. That is the only time I hear it si far. It doesnt do it in any other gear at all. I am wondering if this is at all normal and if it will cause my turbo to blow sooner then later ? Or is it fairly common and harmless in small amounts ?

I should note. That I am running the know. So i never heard the turbo or noise before maybe ? Maybe it was always there before. The day he tuned my car I installed the intake so he could tune for my kn. I am also NOT running the vac tank anymore if that AT ALL causes any of it, I broke it years ago by mistake ..

Under all other conditins and times my car works great and perfect. It now shreds my poor tires in 2nd gear. And even after a wot pull. I get and hear no flutter at all. Any thoughts ? Thanks

Snail_SS

iTrader: (3)

Well if you just installed the intake i would be guessing your hearing it from that probably check for shaft play just to be sure

tomj77

iTrader: (2)

It's cause of the vac tank delete. The vac tank stores vacuum to open bp valve quicker, without it it's slightly slower and at low load it ur car won't pull vacuum fast enough to open it on time. If u have a forge bpv make sure u have lighter spring in, it helps a lot. Otherwise u have to live with it

QuickSilver_SS

I am still running the stock bpv. Never touched at all. I am okay with the noise as long as it doesnt blow my turbo up or bend the blades. I just checked for shaft play and there is none at all. I just wanna make sure the noise is harmless after the vac tank delete ans the kn and my tune. Cause it like when i first installed gms1 all over again. Lol...

QuickSilver_SS

Am i okay to run 21 psi and my tune with no vac tank ? Or am i better off to re-install the vac tank. Cause its broke...

Snail_SS

iTrader: (3)

Your fine To be without it im running 23 psi and dont have it

tomj77

iTrader: (2)

yes ur fine with running no vac tank, its simply to help the bpv and for sound dampening. I run no vac tank on zfr on 28 psi.

QuickSilver_SS

So the small amount of turbo flutter i have now is no worry at all ? Like i say. It only happens in 1st while im coasting a few seconds later for a split second.

footballplaya3k

iTrader: (1)

Flutter is fine, surge is bad and can cause damage.

QuickSilver_SS

Honestly.. I dont know the difference between the two ?? All i know is what i have is veey faint and doesnt happen all the time. Lol. I just dont want to hurt anything. I imagine it is a faint amount of flutter. But what is the difference between them ?

Omiotek

iTrader: (2)

All these cars make the fluttering noise for the most part. It's normal don't worry about it. You should hear the solstice with a vacuum pump. it's even worse

slapbetcommissioner

iTrader: (3)

If it's only happening in first it's just a symptom of a low boost. The k&n just amplifies the sound that was always there and you just couldn't hear it. As long as it isn't doing it in other gears I wouldn't worry about it. If it does and you feel power loss it's probably going into limp mode and there may be a code logged that isn't a cel. Usually a symptom of gms1ower tmap sensor wiring.

tomj77

iTrader: (2)

Surge is when ur at wot and ur turbo is trying to hit full boost and starts to flutter when gas is on the floor. Zfr do that a little at around 4-4500k rpm it's a pain to tune out. I got mine pretty well gone but still does it a little one in a while. Not enough to do damage

no_ss

iTrader: (2)

Did you get your 1st gear boost reduced as well with the tune? Could go with what he's saying up there about low boost

ECaulk

iTrader: (6)

You'll know when it's surge, nothing like the flutter. With surge the car feels like it's misfiring and bucking and it's louder than flutter significantly.

RyBread761

iTrader: (2)

Synaptic1 on Youtube has great videos demonstrating compressor surge:

And what some might THINK is compressor surge, but is considered 'flutter-dump':

footballplaya3k

iTrader: (1)

Good examples.

Snail_SS

iTrader: (3)

They are good examples i think i get flutterdump sometimes

StrykerCC

Yikes, I might be getting surge!

So, is it the spring on the BPV that I need to check?

The car cuts out sometimes between 5-6k, I thought it was possibly dirty intake valves. Got some seafoam to run through it, but haven't done it yet.

Snail_SS

iTrader: (3)

Seafoam doesnt really work for the lnf.

StrykerCC

Great. Well, I am wondering now if it just needs plugs. Amongst other things...

Snail_SS

iTrader: (3)

If you want to clean your valves use the walnut blasting

breds2k

iTrader: (1)

So I get flutter dump a bit with my Forge BOV, also I find the let off totally annoying like its too easy in everyday traffic (I commute) So I thought about using a yellow spring. Now watching that video I definitely have that "issue" I quick flutter before full dump,

Snail_SS

iTrader: (3)

I only get it if i give it very light throttle but if i give it just a tad more it sounds like it should, i had it even with the stock bpv

RyBread761

iTrader: (2)

I have the lighter spring in my Forge unit, and I def get flutter dump if I build boost and let off real quick. No big deal.