R33 Gtst Something Went Wrong Please Help

[Trozzle]

Of course I'm not doing calculations, and I admit I'm merely making assumptions.

If it weren't for the (very small amount) of exhaust gasses still turning the turbine when the throttle is closed, then the stress would be even less in my mind. Of course they're on bearings and can be accelerated at any rate in any direction, but it's still a decent force acting on parts that shouldn't really cop it...so if it's avoidable then why not avoid it just *in case*

[Rolls]

When you throttle off you lose all exhaust gases (basically) so any force acting on the blades is now essentially gone, hence it is not an issue, if you continue to apply exhaust gases and the flutter continues (real surge) then yes you will cause the turbo to shit it self, different conditions and causes though.

The stresses are so small they are negligible, there are more forces put on it during normal operation at full throttle (massive speeds and temperatures).

Some great examples of why this is negligible force is the ford sierras that ran equivalent for 650 1/4 races and 6 hours of constant track work with 36psi and NO BOV if they thought it would improve spool time, throttle response or turbo life they certainly would have fitted them. There are examples of VL turbos doing 300,000kms on the standard turbo with no BOV and no issues as well in that thread if you feel like reading it all.

Edited November 8, 2010 by Rolls

[Trozzle]

we all know VL turbo owners don't do it for any mechanical reasons tho

tutututututututu

[Rolls]

Doesn't stop it being decent evidence though.

edit: Funny picture to ease the tension

Edited November 8, 2010 by Rolls