Quote:
Originally Posted by jimk
.... The whistle may be the turbine blade tips, or vortices coming off them, exceeding the speed of sound.
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no. a turbo would not last long if this where the case, nor would it even perform well, if at all. it would likely fly apart way before that.
the whistle is produced as a by-product of the exducer design. typically, the fewer the vanes, the more prone to whistle a turbo has. example: ford 6.0L powerstroke - '03 motors "whistle", '04s much less, and '05 - '07s barely at all. '03 turbos had 10 vanes, then 13, then 14 and 15 respectively.
however, inducer design can also produce quite a bit of whistle. example: 2nd gen cummins - go remove the "silencer ring" and you'll get under-hood whistle, especially if you remove the stock filter box.
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Travis
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Bob'd Deuce on 16.00 XZL's
- lifted, locked, and hydro-steered
- 5.9 Cummins w/ NV4500
- hydro-boosted disc brakes
- hydraulic winch conversion
