SBD turbo surge??

[shif7i7down]

Alright guys i got a question. I just got done installing the SBD turbo kit and took the car out for a drive, here's the order of event.

3krpm
Wot
Turbo spools
Car accelerates
Around 6krpm the bov starts fluttering like crazy while in boost.

Any idea what's causing this?

[woode]

Are you losing boost? The BOV is just a spring and a vacuum line working against eachother.. is the vacuum line connection solid?

[shif7i7down]

Physically, the lines looks secure. And its not like I'm boosting high, only 7psi.
I Let go of the gas soon as i heard it so I'm not sure if I'm losing boost or not. I'll see if i can recreate three problem when the snow lets up

[woode]

Are you sure you're talking about the BOV..? The BOV releases pressure in the intake piping. I can't imagine how it would "flutter". If there was something wrong, it would maybe not be shut all the way at idle or not open enough at low boost and cause turbo flutter.. but I can't imagine how it would flutter at WOT.

Are you hearing the turbo spooling and the wastegate maintaining the 7psi? Is the whole turbo thing new to you or is this a recent new problem?

[shif7i7down]

it's the only thing i could think of that's making that noise. it may very well be something else that's causing the noise, but i did double check the lines that runs from the bov to the brakebooster and it looks fine.
i was also able to get a datalog of the even, but it looks like nothings going on.
here's the link the datazap, it happened at around 33s
Yes, happen while in wot. And yes I'm new to the turbo scene.
I'll see if i can get a video recording of it. Maybe that'll help explain it better

http://www.datazap.me/u/shif7i7down9...2&zoom=235-340

[woode]

Originally Posted by shif7i7down

it's the only thing i could think of that's making that noise. i may very well be something else that's causing the noise, but i did double check the lines that runs from the bov to the brakebooster and it looks fine.
i was also able to get a datalog of the even, but it looks like nothings going on.
here's the link the datazap, it happened at around 33s
http://www.datazap.me/u/shif7i7down9...2&zoom=235-340

Well you let off the throttle at 33s, and up to then your boost was rock solid so it wasn't your BOV. Pretty sure you are just hearing your turbo..

Do you have a way to monitor your actual boost levels, is that the stock MAP sensor? I am assuming you are running more than 5.37psi. Everything looks fine though..

[shif7i7down]

Yeah, the oft seems to top out at 5psi-ish but it's suppose to be a 7.5psi internally Wastegated turbo. And yes I'm running the stock map sensor. Any yes it was going fine until i heard the clinging and Ley off the gas.

Kinda sounds like when you grind your gears

[woode]

Originally Posted by shif7i7down

Yeah, the oft seems to top out at 5psi-ish but it's suppose to be a 7.5psi internally Wastegated turbo. And yes I'm running the stock map sensor. Any yes it was going fine until i heard the clinging and Ley off the gas

Clinging or fluttering? I'd have to hear the noise..

What I am imagining you are hearing is the turbo makes sort of a fluttering spool noise once it spools and the wastegate tries to maintain X psi. But maybe you are hearing something else.. try to get a video. Whatever it is, it's not your BOV, and I highly doubt it's serious because your log looked normal.

[woode]

Looking more at your log, not likely related to your noise, but your long term fuel trims are pretty ridiculously high. Who tuned your car?

[shif7i7down]

Okay. I'll try it out again in the morning once they clear the snow off the road

[shif7i7down]

Lol. I was in a hurry to play with the newly installed kit and filed the tank with 93oct while there was still a quarter tank of e85 left . But the tune is from shiv oft

[woode]

Originally Posted by shif7i7down

Lol. I was in a hurry to play with the newly installed kit and filed the tank with 93oct while there was still a quarter tank of e85 left . But the tune is from shiv oft

I see, I would try to get as much 93 in there.. Your AFRs seem a little inconsistent.. but nothing that would cause the noise you are talking about.

[shif7i7down]

Ok. But the closes sound i could think of is like when you have a fan running and you run something across the blades, but more of a metallic sound

[woode]

Originally Posted by shif7i7down

Ok. But the closes sound i could think of is like when you have a fan running and you run something across the blades, but more of a metallic sound

Metallic? Hmm..

Was that the first pull, or have you gone WOT before without said noise?