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Thread: squeaking noise from WRC cars
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24th March 2009, 20:34 #41Originally Posted by ZicoYou're so beige, you probably think this signature is about someone else.
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24th March 2009, 20:43 #42
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Originally Posted by ZicoRule 1 of the forum, always accuse anyone who disagrees with you of bias.I would say that though.
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25th March 2009, 00:52 #43
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I thought it was stated that wrc cars dont have a waste gate...
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25th March 2009, 18:44 #44Originally Posted by zerodegreecThe emergence of the new 'Rainmaster' - Mad Max at Interlagos 2016!
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25th March 2009, 19:28 #45Originally Posted by Zico
http://www.turbobygarrett.com/turbob...o_tech103.html
Dump valve = blow of valve, BOV.
“Surge will decay once the turbo speed finally slows enough to reduce the boost and move the operating point back into the stable region. This situation is commonly addressed by using a Blow-Off Valves (BOV) or bypass valve. A BOV functions to vent intake pressure to atmosphere so that the mass flow ramps down smoothly, keeping the compressor out of surge. In the case of a recirculating bypass valve, the airflow is recirculated back to the compressor inlet.”
http://www.turbobygarrett.com/turbob...o_tech101.html
Wastegates
On the exhaust side, a Wastegates provides us a means to control the boost pressure of the engine. Some commercial diesel applications do not use a Wastegates at all. This type of system is called a free-floating turbocharger.
However, the vast majority of gasoline performance applications require a Wastegates. There are two (2) configurations of Wastegates, internal or external. Both internal and external Wastegates provide a means to bypass exhaust flow from the turbine wheel. Bypassing this energy (e.g. exhaust flow) reduces the power driving the turbine wheel to match the power required for a given boost level. Similar to the BOV, the Wastegates uses boost pressure and spring force to regulate the flow bypassing the turbine.
Internal Wastegates are built into the turbine housing and consist of a “flapper” valve, crank arm, rod end, and pneumatic actuator. It is important to connect this actuator only to boost pressure; i.e. it is not designed to handle vacuum and as such should not be referenced to an intake manifold.
Internal Wastegate
External Wastegates are added to the exhaust plumbing on the exhaust manifold or header. The advantage of external Wastegates is that the bypassed flow can be reintroduced into the exhaust stream further downstream of the turbine. This tends to
improve the turbine’s performance. On racing applications, this Wastegated exhaust flow can be vented directly to atmosphere.“Don’t eat the yellow snow” Frank Zappa
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25th March 2009, 20:18 #46Originally Posted by OldF
So, the noise is created by the compressed air going backwards (when throttle is lifted) through the compressor wheel. In other words neither the BOV or Wastegate are related to the noise. Is that correct?
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26th March 2009, 07:00 #47
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The BOV/BPV and the wastegate also make noices. Different noises dependent of the setup. BOV are often made so they will sound the most. Many love the blowing/exhaling sound when shifting gears. This can also be heard when using BPV, especially with open air-filters. then you hear the air rushes back. WRC doesn't use wastegate, but the ALS will also make noises.
A turbo engine is like a small orchestra.
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26th March 2009, 08:00 #48
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Originally Posted by GardRule 1 of the forum, always accuse anyone who disagrees with you of bias.I would say that though.
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26th March 2009, 08:15 #49
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Originally Posted by Daniel
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26th March 2009, 08:30 #50
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Originally Posted by GardRule 1 of the forum, always accuse anyone who disagrees with you of bias.I would say that though.
Mikkelsen https://www.youtube.com/watch?v=hpe6ipk1NKU
Hyundai WRT