Tial external wastegate......flutter

[mustg5]

When i let off the gas, even at like really low boost, it sounds like my wastegate is fluttering, kind of like it does when i hit full boost, just not as loud...........is that normal..............my wategate spring is set at 15psi, but it still flutters when i let off the gas???

 

[mustg5]

anyone else running external hear of this?

 

[CanadianTSi]

When you let off the Gas you BOV would be fluttering not your wastegate...

 

[mustg5]

the BOV flutters???? ive only heard of them making the oh so famous pishhh sound........its not compressor surge, because i know what that sounds like, one of my buddies had it, not pretty sounding.......anyway, so u think its the BOV that flutters???

 

[DSMJim]

Compressor surge sounds like cha cha cha. sort of like what an HKS blow off valve sounds like at a lower pitch. If your getting a fluttering sounds it's probablly compressor surge. The sound changes with the amount of boost and the pipes you run..

 

[mustg5]

well compressor surge is cause by the BOV not opening right?? Well, i even loosened my BOV to almost all the way soft, and i still get it......it doesnt sound like this...that for sure.....http://www.26liter.us/videos/3inchexhausttest.mpeg

 

[dthquazi1]

it sounds like you hooked up a turkey gobbler to your bov.

 

[dthquazi1]

http://www.dsmtuners.com/forums/showthread.php?t=45128&highlight=turkey

check out the first post.

 

[mustg5]

in other words, your saying compressor surge also......hard to explain but it doesnt sound like surge.......ive heard surge in person, and doesnt sound like that

 

[dthquazi1]

it could be very easily different. What bov do you have?

 

[mustg5]

greddy type s

 

[dthquazi1]

yeah its the bov. Hope that thread helped.

 

[mustg5]

i think it will help too.....thanks for your guys help, one more thing......why do you say it is the BOV then?? Just curious for future reference

 

[dthquazi1]

i would say it is the bov bacuase it happened when you let off the throttle. The wastegate opens when you hit full boost. I also had a RFL that would flutter at low boost. It was fairly loud too.

 

[mustg5]

alright thanks

 

[Airpoppoff]

alright thanks

you can always try to route it back to the intake pipe. It will probobly fix it

 

[mustg5]

mine is routed back in, im not venting

 

[ModInProgress]

The wastegate does open when the boost in the pipes is above 15 psi, which can happen when you let of the gas suddenly because the cylinders wont be accepting the pressure the turbo is producing, and the wastegate will bypass the turbo to decrease the psi. if it didnt the bov would make the psshhhh noise for longer then the second you hear it. You wont see it go above 15 +/-1 because the turbo cant create boost if the exhaust isnt spinning the turbo, so the wastegate opens immediately to release the pressure along with the bov, not allowing the boost gauge tap to see that pressure. Clearly that noise is the wastegate, i know from hearing the noise while being in the car and outside of the car.

 

[mustg5]

thanks......i belive it is the wastegate too, the car was cold.....i took it around the block real quick and hit 3 or 4 pounds of boost and let off, it made the noise again.,......so to check if it was the wategate i felt the dumptube, and sure enough it was hot from the exhaust gas passing through

 

[mustg5]

this modinprogress guy really knows his shit.....haha.....havent seen you on here in a while jason...

 

[ModInProgress]

its heard being this smart. EDIT, Im gonna go with hard.

 

[mustg5]

heard..............must be real HARD if you forgot how to spell it.......

 

[ModInProgress]

ya, somthing fell on the keyboard and i didnt notice, must of fell right on the "e" key.

 

[mustg5]

dam cat probably