2GN.ORG

Ever since I bought the car I noticed a flutter....but I always thought it was wastegate/bov flutter now I'm starting to wonder if it was compressor surge and I screwed up my turbo.....last week during the polar vortex I had a lot of fun with the cold weather I'm on a stock turbo running 15 pounds of boost. One day after boosting I wanted to boost again and it went up to 10 pounds and started dropping. At any speed, (lets say I was doing 50 mph) I would let go of the gas the flutter would happen and my gauge would read -20 vacuum side. Now it flutters and reads -28 almost -30 vacuum side on the gauge. Was the flutter compressor surge and I screwed up my turbo? The flutter happens any time I let off the gas if I hit the gas run it to 10 pounds let go it flutters or if I step on the gas to speed up a little the gauge goes to -10 vacuum I let go of the gas and it flutters...


TL;DR
Stock turbo 15 pounds. At any speed I let go of the gas I hear a flutter, if I'm at -10 vacuum accelerating from 50 mph-55mph let go of the gas it flutters, or if I'm going from 50-65 mph and the gauge reads 10 pounds let go of the gas it flutters.


PS. BOV is a turboxs looks like a recirculating bov.. it has no big horn

http://www.jscspeed.com/catalog/Turbo_X ... 373-1.html

first one is my BOV

When I was able to hold and boost at 15 no flutter and no BOV sound. It's quiet you don't even hear the pssss of the turbo

Are you sure your hoses are ran correctly and without and leaks?? That's where I would start

i know when is really cold out my bov has a hard time opening like it does on a warm day...happens to a used greddy type s and brand new hks

Hoses are correct, no boost leak on the boost leak test. It's getting more air somewhere though would be my assumption.

well the flutter is coming from the WGA on that rod....I noticed if I moved the rod/pushed the rod to the left, rev the engine let go flutter goes away. The lines are hooked up to a manual boost controller.....still no boost