Quote: Originally Posted by
duster360 
You state "Turbine housing" about 4 times but to the rest of society thats the whole deal. The losses I mentioned are more focused on the axial clearances from Inducer blade tip to the wall. As far as I can tell from your various pics, your porting doesn't give this area the consideration it should.
The testing will be for the benefits of 'tweaking' both turbine housings and manifolds thru porting and coating, not just turbine housings.
While I do think what you are getting at is a valid point (essentially referencing the exducer bore and it's clearance to the turbine) but that is beyond the scope of this test and I really wouldn't honestly feel confident telling garrett that they need to change their designs IF they even needed modification.... However if you have thoughts on this I am all ears.
Quote: Originally Posted by duster360
More heat isn't always best. When a gas becomes too hot and the velocity too great, the Mach number reaches 1.0 and the mass flow Chokes, as in STOPs increasing. Once the gas's Mach # = 1 it will not matter how high the pressure is before the Turbine of how low it is after it, the mass flow will NOT increase(without a shock wave that is). Obviously a stagnant mass flow will accellerate the turbine but it WILL put the kibosh on high RPM hp. If no more mass air can get OUT, it sure as hell can't get in.
A valid point, but what you are forgetting is that there is something controlling speed and pressure in this situation... the turbo. I am versed in the physics behind airflow's characteristics near and after mach but we won't be changing things to that extreme. I know what you are getting at but for all intensive purposes I am only looking to increase efficiencies and not redesign the entire setup. What you are talking about is beyond the scope of this test.
Quote: Originally Posted by duster360
Quick spools are great(stock turbo) except when they CHOKE too soon.
We aren't talking about stock turbos, and realistically I am talking about getting things to spool perhaps 300-400rpm quicker which will not effect the choke point to any extreme. This test is to show the effects of porting and coating (essentially increasing airflow quality and increasing thermal efficiencies) and nothing more.
If it was as in depth as you are talking about we would be talking about aggregate energy and velocity losses from manifold and volute shape and not about improving the parts that so many people already have.
