Ok, my car has this annoying wam wam wam wam sound while accelerating from low speeds.. I have an auto with a GT3071R and Tial 44mm WG.. I have the boost set around 10lbs..
Im not understanding why the car does this? How can this be solved, if it can? I Always let off the gas when this happens because im scared im going to blow something lol. Can someone please help me understand this better? lol I dont want to be hearing this while im at the drag strip.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
well unfortunately, that description is WAY to vauge for me to help you out.....
if compressor surge is the problem, there are lots of things to do to help fix the problem.
If it is something else......need more info....
what else is going on when this happens, are you in boost, if so, how much?
Is this when your turbo is first spooling? fully spooled? not spooling at all???
what RPM range are we talking, and what A/R turbo is it?
What else is in your turbo system?? boost controller...etc?
Surge is something I've been fighting as well. I've managed to eliminate most of it by reducing the pressure on the spring in my bov, but it still exists under light pedal input followed by a let off, as in normal driving circumstances.
Sounds like a sequential bov kinda if that helps.
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
John Benham wrote:well unfortunately, that description is WAY to vauge for me to help you out.....
if compressor surge is the problem, there are lots of things to do to help fix the problem.
If it is something else......need more info....
what else is going on when this happens, are you in boost, if so, how much?
Is this when your turbo is first spooling? fully spooled? not spooling at all???
what RPM range are we talking, and what A/R turbo is it?
What else is in your turbo system?? boost controller...etc?
Well sorry, I thought I explained what was going on.
Yes, its when the turbo is first spooling.. Between 2500 and 3500 RPM when im in boost.
Its a 63 ar turbo.
I have a Turbo XS manual boost controller
Skunk: yeah its the HKS SSQ blow off valve.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD
AUTOMATIC!!
328 HP
306 TQ
That BOV is set by a spring correct??
Or is that one spaced out by washers.....Anyways, sounds like you need to adjust the BOV, and make it a tad softer.
John I have no clue, I can ask my guy if he can adjust the spring for me since he deals with these everyday..
Thanks, ill keep this updated.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
Btw, forgot to mention I wasnt even full throttle when this was happening.. Id say around 30-40% throttle. I heard the problem goes away once you get into the upper rpms and more throttle.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
well from what I understand there are different "versions" of that BOV, each adjusts diffrerently, and 1 is non adjustable.
its very common to get this problem with that BOV, you can also change the location of where in your charge pipe it is mounted, and it will help the problem.
A lot of people, who dont like the effects, get a different bov.
compressor surge is the reversal of airflow in the charge pipes once you let off the gas and there isnt enough pressure to push open your BOV and it bounces off the throttle plate and slams back into your compressor wheel temporarily causing your compressor wheel to spin backwards.
compressor surge is honestly one of the huge killers of turbos because it can burn up bearings and chip fins.
there are a few ways to help control compressor surge.
one would be to adjust your bov so that it doesnt take so much pressure to open it
and another cure would be to have your compressor housing machined with anti-surge ports. they are ports that line the entrance to the compressor and they go all the way through the housing to the inside of the housing where the air flows off the compressor wheel. that way when the air goes back into the compressor housing that the air flows back through the anti-sugre ports before it hits the compressor wheel and the air is then sucked back into the opening of the turbo like normal air and doesnt @!#$ up your compressor wheel.
hope that explains and helps you understand more david and skunk
Bonnett aka Pancake wrote:
and another cure would be to have your compressor housing machined with anti-surge ports. they are ports that line the entrance to the compressor and they go all the way through the housing to the inside of the housing where the air flows off the compressor wheel. that way when the air goes back into the compressor housing that the air flows back through the anti-sugre ports before it hits the compressor wheel and the air is then sucked back into the opening of the turbo like normal air and doesnt @!#$ up your compressor wheel.
I would suggest this. I dont have any problems with my gt35r with that machining option. I also have a tial wastegate.
Thanks Brandon.. I dont think ill be taking the turbo off anytime soon.. Maybe over the winter.. Ill try the BOV adjusting and see if that helps.
Anybody know who can machine anti-surge ports?
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
Here is a pic of anti-surge machining done to my compressor housing.
So you know what it looks like.
And this was an option from ATP when I bought the turbo.
You might be able to send it there to be done.
Edited 1 time(s). Last edited Tuesday, August 19, 2008 6:57 AM
- Attachments
- DSCF0003.JPG (328k)
Yeah I've seen plenty of the anti-surge housings on atp and other sites as well.
Yeah now I understand what I'm up against it makes solving the problem a lil easier.
Thanks Pancake.
Edited 1 time(s). Last edited Tuesday, August 19, 2008 6:59 AM
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
Thanks John,
The problem with that is, I have an aluminum 90 degree elbow welded on that side so I could put a pipe and filter on my turbo
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD
AUTOMATIC!!
328 HP
306 TQ
