Out of curiosity...do any of you guys know what trim the compressor and turbine wheels are on a stock Powerstroke turbo?

 

Sorry no I don't.

 

I don't understand the question.

 

to answer what "trim" is, but as for what ours is, i dont know.

 

Ahhh Thanx. I never heard that term. I learned something today.
So not to hijack but what is that number used for?

 

your guess is as good as mine. I would suspect it to relate to flow ratings and patterns

 

Its for turbo gurus that want to know the real specs that can determine the output of the charger.

Think of it this way, the inducer grabs the ambient air and the exducer shoots compressed air out of the turbo.

Now on to the very important stuff if your considering inducer/exducer upgrades!

Turbo Surge = Is when you high a too big of a inducer compared to the exducer. This causes the air to become somewhat backed up because the exducer can't shoot or compress it fast enough causing a reverse flow. This is a big problem to the SD's and why the wicked wheel is so popular because the inducer/exducer has been changed.

Increasing the inducer will flow more air, cause more lag on the low end, but she will scream like a raped ape once she lights.

Compressor maps offer the best way to show the real ouput of the charger. However, for some reason companies don't want anyone to see them because they are hard to find. Plus, most people don't pay this much attention to the charger.
I wish I had a good picture showing the differences but I don't.

Hope this gives you a better understanding of the Inducer/Exducer


Ahh.. The stocker has such small numbers

 

Actually, I'm curious about the trim because I was looking at some compressor maps for the turbo on my truck, and it's pitifully undersized even at the low boost levels we run on the IDI's (12-15 psi).

I'm not even sure if a T4 would fit, but I was curious to get some "hard numbers" on the factory PSD turbo (I already know the factory A/R's but not the trim...can't find out the exact trim on the compressor on my own turbo ), especially since with a compressor wheel trim to go by I could at least locate a compressor map.

Anyway, to finish the previous idea, just bouncing around the thought of "what if" with a PSD turbo, and smaller wastegated turbine housing, since I see them for sale all over the place.

 

Are you talking about a Precision T3/T4?

I'm just thinking off my head but thats a Schwitzer s200?

You sound like you know what you want to do. The question that I have it why you want to stay with a stock garrett PSD which you can't modify compared to others. Compressor housing, impeller, compressor, etc.

What are you looking for out of a new turbo setup? Spool up, low end, top end?

 

???


Anyway- the reason I was looking at the stock PSD turbo is availability & price...and it looks like a better sized turbo than the one that's on there (which is a T3/T04B hybrid... .81 Stage III hot side, .70 cold side of unknown trim). Wouldn't be looking to do much of any upgrading except, like I said, perhaps a smaller turbine housing to help it spool (something smaller than the stock 1.15 at least...maybe a 1.00 or .84).

I'd like something more efficient, and the turbo on there now really falls off on the top end. Bottom end is pretty good. And not looking to spend too much $$$ to get there

 

The T04B is a garrett.

If your looking for better spool up look at the 1.00 housing. You can get the smaller housings pretty cheap. The .84 might be a little too small for your application. I don't think you'd want to lower your top end potential.

I'm not sure how much his would improve your overall efficiency. Drive pressure will be around 2/1, but it would light better.