Turkey gobble? Compression surge?

[dfsho]

I have read a lot of different things on the "turkey gobble/compression surge"
Can anyone tell me what it really is. And how bad it is for your car? if bad at all.

Ive heard alot of different things. Some say msp's driven off the lot make that noise. no big deal
Others say kill the turkey ASAP!

Please help!

(hand)

 

[HighSpeed]

Its basically due to the fact that the stock recirculation system is too small. The diameter of the recirculation fitting on the hot pipe is like 1/2 inch, making it hard for all the air to pass through. All stock msps have this as far as I know.

I recently broke my stock hot pipe recirculation fitting and pulled it off. I bored the hole out on the pipe to about 3/4 inches, maybe slightly bigger......and made my own piping that included a Boost Science BPV. I inadvertently fixed the turkey by boring the hole on the stock pipe, so no more turkey for me.

Some other members will have thier own stories to tell as well. But this is mine.

I drove my car with the turkey for 174,xxx miles and my turbo is fine, but I may be a special case

GL

 

[super1chow]

Pretty sure all the stock MSPs have it. I got rid of the turkey by using the dual bpv/bov setup. theres the link of how to kill your turkey http://www.mazdas247.com/forum/showthread.php?123711609-Kill-your-Turkey-V.2

 

[Revmoto]

Can I make a suggestion? Somebody please try re-routing all of your vacuum lines to where nothing is t'd off of the line going from your intake manifold to your diverter valve. Anything bleeding off of the line will cause your valve to not function properly during lift off and flutter. The intercooler system is plenty small for a 1 inch diameter pipe to relieve the pressure in the system. All 1.8T VW vehicles use this same diameter without issue and I have used the same size valve on a turbo sentra, turbo mp5, s13, wrx, and an EVO without this issue.

 

[BOOSTR]

Its not compressor surge. Don't believe everything you read.

 

[HighSpeed]

Can I make a suggestion? Somebody please try re-routing all of your vacuum lines to where nothing is t'd off of the line going from your intake manifold to your diverter valve. Anything bleeding off of the line will cause your valve to not function properly during lift off and flutter. The intercooler system is plenty small for a 1 inch diameter pipe to relieve the pressure in the system. All 1.8T VW vehicles use this same diameter without issue and I have used the same size valve on a turbo sentra, turbo mp5, s13, wrx, and an EVO without this issue.

Im pretty sure ours is smaller than one inch......I upgraded to one inch piping so that I could use my Boost Science BPV, and if you look around at the dual valve set ups you will see that the added relief from having two valves works quite nicely. The stock BPV is crap and not adjustable. People have also tried rerouting the vacuum and it doesn't work completely all the time, although it is recommended anyways because it does help and some people have said it fixes the problem. I still believe that the problem lies in the very cramped BPV stock nipple

 

[dfsho]

You see what i mean!!

Its not compressor surge. Don't believe everything you read.

This is exactly what I mean. People keep telling me everyones full of s*** it does no harm. And others say fix it. WHAT DO I DO?!?!

 

[BOOSTR]

Quit worrying about it being compressor surge is my advice to you. Or change your setup if the flutter sound bothers you.

 

[littlemimus]

welp my car has been doing the so called "compressor surge" thing for 113k miles and the turbo is fine. so dont wory about it. ud know if it was compressor surge. if u have a boost gauge itd be jumping all over the place

 

[dfsho]

Thanks for the input! keep em coming!!

 

[silvermsp88]

welp my car has been doing the so called "compressor surge" thing for 113k miles and the turbo is fine. so dont wory about it. ud know if it was compressor surge. if u have a boost gauge itd be jumping all over the place

my bro has a sr20 1998 240sx and he told me that since im only pushing 7psi i dnt have to worry bout it unlike him, but hes got more cash then i do. and hes running a gt28. i have a boost gauge im gonna try watching my gauge on the flutter, i have the same flutter, ill let u know what i find.

 

[Spiced MSP]

real compressor surge only happens during boost right? like when your turbo is not sized correctly or is too small for the amount of boost you are trying to get out of it or something like that? Most turbo cars I have heard do have a little flutter coming off of the throttle. Nothing major to have to worry about

 

[littlemimus]

real compressor surge only happens during boost right? like when your turbo is not sized correctly or is too small for the amount of boost you are trying to get out of it or something like that? Most turbo cars I have heard do have a little flutter coming off of the throttle. Nothing major to have to worry about

taken from garrett

"What is compressor surge?
The surge region, located on the left-hand side of the compressor map (known as the surge line), is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur. When referencing a compressor map, the surge line is the line bordering the islands on their far left side.
Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself.
Common conditions that result in compressor surge on turbocharger gasoline engines are:

* A compressor bypass valve is not integrated into the intake plumbing between the compressor outlet and throttle body
* The outlet plumbing for the bypass valve is too small or restrictive
* The turbo is too big for the application"

 

[littlemimus]

taken from garrett

"What is compressor surge?
The surge region, located on the left-hand side of the compressor map (known as the surge line), is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur. When referencing a compressor map, the surge line is the line bordering the islands on their far left side.
Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself.
Common conditions that result in compressor surge on turbocharger gasoline engines are:

* A compressor bypass valve is not integrated into the intake plumbing between the compressor outlet and throttle body
* The outlet plumbing for the bypass valve is too small or restrictive
* The turbo is too big for the application"

iirc you can also get compressor surge if you try to push to much air into the engine itll start to back up and spin the blades backwards

 

[littlemimus]

my bro has a sr20 1998 240sx and he told me that since im only pushing 7psi i dnt have to worry bout it unlike him, but hes got more cash then i do. and hes running a gt28. i have a boost gauge im gonna try watching my gauge on the flutter, i have the same flutter, ill let u know what i find.

itd be doing it while its in boost though. when you let off it shouldnt jump around like that.