Need New Turbo

[loopism]

opinions are like a$$holes everyone has one.

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Isn't it funny how not everyone is prepared to expose their ring, but lets their opinion fly in the breeze

[SAMSXR6T]

Yeah now I am all confused at how and why the blades were all bent... I appreciate everyone’s views and I understand everyone has there own opinions... Especially some of you guys on the forum with mods done by aps or nizpro... maybe my turbo did suck up a little creature to cause the damage but I am not 100% certain… but I am happy to read what you guys have posted..

[Paradoxx]

??

[SAMSXR6T]

Haven’t taken turbo off car as yet but it is booked in for next Wensdy... would an average person like me be able to install the new turbo... I am mech minded but never have mucked around with turbo's...

[Lawsy]

**Snip**

Quite right, the forces acting on the shaft will be to the power of 4 when we are applying the force on the blades of a turbine... Obviousl there is more to the equation then just 'to the power of 4', but I can't remember the whole thing atm either, and I ain't looking it up.

There is one thing we are all forgetting though... Impulse pressure.

When the throttle body slams shut, it sends a very voilent impulse back through the inlet system.... Now, these pulses have more force acting along the line of the pulse, and not alot in the normal plane to the pulse (so, outward, meaning its less likely to blow a clamp off).

If you manage to hit your turbine at just the right time with one of these, then sure, you can bend stuff.... Unlikely, but possible. Think of it like sending a jet of water back at your turbine for a microsecond, but at really high pressure....

Its just really rare to get one of these to perfectly time itself (rare meaning, maybe 1 in a million gearshifts will ever have this happen, I'm not 100% sure on what actually causes them to form (other than the throttle shutting)) or why they are powerfull, but meh.... You get that

[SAMSXR6T]

could the damage on the turbo be damaged by a faulty throttle body..

[81CJH]

If you manage to hit your turbine at just the right time with one of these, then sure, you can bend stuff.... Unlikely, but possible. Think of it like sending a jet of water back at your turbine for a microsecond, but at really high pressure....

Its just really rare to get one of these to perfectly time itself (rare meaning, maybe 1 in a million gearshifts will ever have this happen, I'm not 100% sure on what actually causes them to form (other than the throttle shutting)) or why they are powerfull, but meh.... You get that

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When lightning strikes, the air immediately around the lightning bolt gets super heated and expands almost instantaneously, causing all the air particles around to bump into each other in a ripple pattern, causing a thunder clap.

Is this kind of like what you're theorising happens with the shock wave? I mean obviously without the thunder clap, but the thunder clap might represent the force exerted on the impeller in this case.

Hell, I dunno. Ring up Dr. Carl.

[Lawsy]

could the damage on the turbo be damaged by a faulty throttle body..

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Very unlikely

If you manage to hit your turbine at just the right time with one of these, then sure, you can bend stuff.... Unlikely, but possible. Think of it like sending a jet of water back at your turbine for a microsecond, but at really high pressure....

Its just really rare to get one of these to perfectly time itself (rare meaning, maybe 1 in a million gearshifts will ever have this happen, I'm not 100% sure on what actually causes them to form (other than the throttle shutting)) or why they are powerfull, but meh.... You get that

←

When lightning strikes, the air immediately around the lightning bolt gets super heated and expands almost instantaneously, causing all the air particles around to bump into each other in a ripple pattern, causing a thunder clap.

Is this kind of like what you're theorising happens with the shock wave? I mean obviously without the thunder clap, but the thunder clap might represent the force exerted on the impeller in this case.

Hell, I dunno. Ring up Dr. Carl.

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Its very similar, and like a sound wave it is a transverse wave, so the particles are vibrating back and forth along the direction of the piping. Every gear change has one of these, but its just rare for it to be powerful enough to break things, but it most definately is possible...

[Adam]

**Snip**

Quite right, the forces acting on the shaft will be to the power of 4 when we are applying the force on the blades of a turbine... Obviousl there is more to the equation then just 'to the power of 4', but I can't remember the whole thing atm either, and I ain't looking it up.

There is one thing we are all forgetting though... Impulse pressure.

When the throttle body slams shut, it sends a very voilent impulse back through the inlet system.... Now, these pulses have more force acting along the line of the pulse, and not alot in the normal plane to the pulse (so, outward, meaning its less likely to blow a clamp off).

If you manage to hit your turbine at just the right time with one of these, then sure, you can bend stuff.... Unlikely, but possible. Think of it like sending a jet of water back at your turbine for a microsecond, but at really high pressure....

Its just really rare to get one of these to perfectly time itself (rare meaning, maybe 1 in a million gearshifts will ever have this happen, I'm not 100% sure on what actually causes them to form (other than the throttle shutting)) or why they are powerfull, but meh.... You get that

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I would have thought the intercooler would of absorbed that pulse your talking about.

[LightningXR6T]

From the Turbosmart website:

Why do I need a Blow-off Valve (BOV)?

Blow-Off Valves eliminate compressor surge when changing gears. Excessive back pressure is created when the throttle is closed during gear changes or deceleration, causing turbo cavitation. This is detrimental to the life of the turbocharger. Fitting a BOV will substantially improve this problem. Installing a BOV will also significantly reduce turbo spool-up time. A substantial improvement in response from the turbo between gearshifts and a quicker boost delivery will result in an increase in torque at lower RPM.

Flutter - good or bad?

The “flutter” noise reported by many excited enthusiasts may sound good but is actually very unhealthy for the turbo. The “flutter” occurs when upon shutting the throttle, air caught between the free-spinning turbo and the shut throttle. The consequent back pressure forces the air back through the turbine blades. This process, more commonly called “cavitation” places enormous loads on the turbo and can lead to premature wear of the turbo bearings and other load-bearing components. The cavitation or “flutter” can be fixed by either fitting a blow-off valve onto a system that hasn’t got one, or making sure the blow-off valve is matched to the output of the turbo and is not working outside its flow capacity and ensuring the blow-off valve is set up correctly.

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Sorry if this is a bit off track, but I have been complaining to Ford re a strange noise coming from under the bonnett. It first appeared when I tried running a 10psi generic tune which produced 15psi.

A noise like something rubbing, or air rushing sound is made when ever it is on boost. All hoses have been checked by myself, Ford and another service centre. Std tune noise definatlly there, 8psi quite noticably worse and 10psi well not game to use it.

I have also noticed that since this noise started that the flutter that usually was difficult to hear and relatively hard to produce, is now quite noticeable and very easy make happen.

Even the whistle that was made by the turbo has gone, or is overpowered by this noise. I guess my question is could something have damaged the turbo? How can I tell? All Ford guys says is "I no turbo's, I'm a mechanic". They say if it was R----d, it would be making a whistle all the time even at idle!