Perhaps there will be a cast wheel available at some point. I am curious about the possibilities of producing a larger capacity from the 16g pattern but extending out to 20G diameter while following the 16g blade curvatures . I can't see where there should be any special problems. Using a fly cutter with any verticle mill should take care of enlarging the housing since, as I understand it, there is enough thickness in the TDO5 casting to accomodate. Gentlemen?

 

Hey guys

I was looking for the regular TME turbo few days ago.
I ran into a distributor that just casted the 20G wheel for the 16G.
but he is waiting for the TME turbo to come in so he can put it together for me.
if I dont want the TME he can do it immediately on a regular

so if the map dont work that means I need to get a custom tune :-(

 

yes I agree with WildRice
the distributor told me they just need to port the houseing a bit bigger to fit

 

Somebody's been talking to Tommy again.

 

Which distributor?

 

Also England - but with the exchange rate - that's $$$

 

ditto man. you can get a really nice gt series turbo for that kind of money, heck the 3071 is just a little over 2k these days.

 

The 20G wheel really isn't all that compared to the Evo 16G. The Evo 16G has a thinner shank than a 20G, or even an old-school big 16G. The thinner shank means that there is more inducer area available to airflow. The airflow of a compressor wheel is mainly related to the area of the inducer. The 20G does have a larger outer diameter, which leads to a larger area. But you have to subtract out the area that is taken up by the shank of the compressor (where the nut holds the compressor wheel to the axle). The shank can't flow air. The 20G shank is HUGE compared to the Evo 16G. As well, the Evo 16G has thinner blades than the 20G.

The exducer diameter of the 16G and the 20G is the same.

The Evo 16G and the 20G aren't all that different in terms of airflow. Despite the fact that I have pointed this out to Dave, he just seems to ignore it. If it was an upgrade at all, it would be a very small one.

If you could make a 20G size wheel with a smaller shank and thinner blades, you might have something worth using. But again, it wouldn't be a huge upgrade.

 

Even with a larger compressor, what about the bottleneck at the turbine side? I was talking to Shiv a bit about this problem this weekend, and even with a larger compressor, maybe even MORE so with a larger compressor, there is going to be a choke-up in the turbine side. I have a 10.5 and even with that I am not sure how much flow will be available out of the turbine side. Can it keep up with more CFM? Will a hybrid only be good for mid-range until the amount of exhaust flow starts to back up at the turbine? Will porting even be enough to help? As you can tell, I do not know, but I have my doubts. Is the wastegate flapper on the 05's simply different, or is it larger? A larger wastegate might help the flow problem.... I know of a couple of projects that are very close to fruition, I was supposed to have one of these developements for the Vishnu tuning this last weekend, it just was not ready. I have a higher flow head, but I might just be passing the choke point from the head straight to the hot side.....

 

Most people knew the outcome, but it was interesting

 

thank you for all of the comments they are all good points
but, let's not jump the conclusion.
We will see how things works out when I rec. it.

I'm hope it will not disappoint me
I expect at least the same performance as the 16G Ti turbo
but we will see...

David

 

You would need to clip the turbine severely in order to increase exhaust flow, which I have never been a fan of.

It is much better to go with a larger turbine wheel like a TD06H. But they don't make TD06H turbine wheels in the "R" style.

With a larger compressor, the turbo should be able to spin more slowly to produce the same mass airflow, which should decrease backpressure because the wastegate can open more for a given boost level. But I don't think that is enough.

 

I'm sure they have already TD06H in the "R" style
with 20G wheel

 

If they did make a TD06HR turbine wheel, Buschur would be using it.

 

I made the same point about the 20g wheel not matching up properly to the exhaust flow of the turbine side (10.5) yet Buschur shot me down for that comment. A few weeks later they realized that the idea was good on paper-bad on performance, oh well. Not to mention the horrible surge this combo would create.