After heavy acceleration however, the massive amounts of compressed air leftover in the intercooler piping (since it sucked in so much on open throttle) will reverse out quickly through the still spinning turbine wheel resulting in more of a whoosh sound with a slight flutter instead. The slower the turbine wheel is spinning (resulting in low volumes of slow moving air in piping), the slower the chopping sound will be which results in a better and clearer flutter sound… this is experienced by releasing the throttle on light acceleration. Why does it sound like there’s a pigeon stuck in the engine?īest to check if there really are any pigeons stuck under your bonnet… but really the chopping effect of the flutter/pigeon sound – the “tu-tu-tu-tu-tu”, is actually the air bouncing between the closed throttle and spinning turbine wheel as it gets pushed out the direction of the air intake.
However when the BOV is removed from the equation (explained in the video and further down) and the pipes that were once connected are blocked off properly, the air has no other escape path except to travel back to where it came from… out the air intake resulting in this unique and sexy “Tutututututu” sound. That somewhere is via the Blow off valve (BOV), and in doing so can make a soft “PSSHHH” noise. When the throttle is suddenly closed on a gear change or deceleration, the left over air that doesn’t get ingested by the engine needs to be released somewhere. It’s air… lots of it being released out the air intake side of the turbo.Īt the most basic level, turbo cars suck in massive amounts of air on open throttle hence the turbine sucking “zzzzzzzzZZZZ” sound. So now that you know what sound I’m talking about and you’ve made your own attempt at the sound, let’s get down to the nitty gritty. The sound is so popular that it’s even invented one liners like “got sik flutters bro?” and “flutters get the chicks”, not to mention the majority of us making the “zzzzzzz tututututututu” sound on our own… yes I’m one of them ( Jay: even my sneeze sounds like flutter). The distinct “dose” or “pigeon” sound that flutters like “suuuuutututututututu” has many fans and many haters, it is a byproduct of turbo cars and many owners modify their cars just to get this sound. Personally, I really like the ' stu tu tu' sound but I would much rather source all the parts needed instead of sacrificing here and there for the sake of a sound that won't improve performance.You know this sound… you’ve heard it on the streets and probably wondered WTF? You know it comes from a sports car (and even buses!) but… what on earth is it? Turbo builds will always be the more expensive as opposed to their naturally aspirated counterparts but you sure as hell get your monies worth when everything clicks into place. There are no benefits to gain from this sort of modification because that is what it essentially is, a modification.įorced induction is like a form of black art that can either make you really happy or staring down the barrel and thinking 'why did I do this'. Tuning down the boost or fitting a higher pressure BOV can remedy the situation and return the ' whoosh' sound. This could mean one of two things, either your wastegate or blow-off valve isn't releasing a sufficient amount of pressure or you are running too much boost on the stock turbo. The compressor blades can run down over time which also provides the opportunity to fit a bigger turbo. In essence, what you are doing is removing a part in how a turbo normally operates and re-configuring it in a way to not need it.Ĭan it harm the engine? No, but it can do a number on the turbo over time especially if you are running high boost. Most people only tend to do it because it sounds awesome and also letting the guy next to you know you mean business.
The conflicting back and forth air pressures in the turbo has no place to go but expelled through the turbo and lets off the ' stu tu tu' sound. The basic concept behind this surge is when the incoming air has no place to be released once the throttle has been closed, which is normally done so through the blow-off valve, and then gets recycled back into the turbo. One particular video by the guys from Go Fast Brett explained what is known as compressor surge and the analogy behind it is very interesting indeed.ĭo you own a turbocharged car that produces either of these sounds? Tell us about your ride Email us
Some liken it to a loud pigeon or bird gobble. I've always wondered how some guys achieved that ' stu tu tu' noise as opposed to the ' whoosh' because it sounds downright cool.
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