but you cant know that, so maybe just google what are BOVs for. Sure, I mean im just a mechanical engineer with over 20 years in the industry of turbocharged engine development. Will my husband divorce me if I dehydrate tomatoes in his F-150 truck?ĭennis Collins, a Highway Accident Investigator at the National Transportation Safety Board The wonderful and epic tale of Yoshi the Yarisįorget the trunk monkey, check out trash pandas. Trying to identify a car? Try /r/whatisthiscar, /r/namethatcar, or /r/rbi.įor information on content removal, user warnings, and bans, please see the Chain of Action page. Create a text post that includes the link and your thoughts on the subject matter.Ħ: Users will need to participate in threads created by others in /r/cars before being able to make their own threads. -Basics of swapping engines/layouts/transmissions/bodiesĢ: Direct image and video links are not allowed. One Million subscribers! WooHoo! Autos Network Subreddit List Follow us > /r/Cars Wiki However, we encourage you to explore other online platforms. We try to be a helpful discussion-driven community while maintaining high-quality discourse and topical content. We're Reddit's central hub for vehicle-related discussion, industry news, reviews, projects, DIY guides, advice, stories, and more. It's all normal wonderful turbo noises./r/Cars is the largest automotive enthusiast community on the Internet. “Blow-off valves only vent to atmosphere” This misconception is likely due to the fact that the characteristic sound of a blow-off valve, that loud, sharp “pssh”, is created by a vent-to-atmosphere valve. A BOV prevents turbo flutter by venting the air pressure that causes surge.ģ. If it occurs at higher engine loads and/or boost levels it can cause premature wear to your turbo. Basically, that flutter is the sound of a turbocharger trying to push air but failing due to a closed throttle, and it dramatically increases load on the bearings of the turbo. “Turbo flutter is harmless” That fluttering noise that some turbocharged cars make when the throttle is suddenly closed, such as during gear changes, is the result of compressor surge. However, it is important to note that the reason these cars run blow-off valves is to prevent compressor surge, which leads to the next misconception…Ģ. I personally like a large sound of "blowing off" excess boost. It lets the excess boost pressure escape into Atmospheres so there is no reverse spooling on the turbo after WOT. Personally, I enjoy my Forge Performance Atmospheric BOV. (Caused by reversed boost pressure.) There is a big debate on the forums about DV vs Atmospheric Blow off Valves. Some Flutter however over prolonged amount of time means your turbo is spooling in the opposite direction. This sound is exemplified by the increased amount of boost pressure from your tune.ġ. This is totally normal, as your Diverter Valve is redirecting the boost pressure back into your turbo so there is no boost loss. I am curious if I could have a faulty stock DV? Possibly wastegate issues? Maybe the open intake is somehow influencing it? Again, I'm pretty clueless to how turbos release pressure and am hoping I can get some advice/opinions on what's going on. I just find it odd that it is almost exclusively happening under low boost and is very random in terms of a typical blowoff sound or the flutter sound. I did a ton of research before resorting to posting here, but couldn't find a definite answer on whether this is normal or if I should be concerned. The most common situation I can think of that I am hearing it is when accelerating to roughly 25-30 mph in second gear and letting off the throttle, and similar situations with 3rd gear (both around or under 3k rpms) It seems like half of the time when I let off the throttle, I will hear the usual PSSSS sound (I have an Integrated Engineering OPEN intake), and the other half I will get the random flutter. The thing that is confusing to me is that this flutter (that stututu noise) is happening very randomly when letting off throttle and is often in low rpms, low boost, and low gears/speed. That being said, I have recently installed an IE downpipe and flashed to unitronic stage 2 and am experiencing some flutter (or surge? again, i'm very new to this and don't know the correct terminology) that has me concerned. So I want to start off by saying that before owning my GTI, I've never owned a turbocharged car or really modded cars for that matter, but I always knew I'd eventually get into it so I'm still very much a beginner to the scene and am always trying to learn more about these engines and turbos in general.
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