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I've been researching turbochargers lately and how the turbo engine works... People always refer to turbos that take a long time to spool up as so called 'big turbos'.

What exactly makes the turbos measure large? Is it the size of the turbine wheel? the size of the compressor? of both combined? What is the logic to referring to a turbocharger as 'big' or 'small'?

also is there a logic behidn the turbocharger names?
some of the names that i've commonly heard are:
ihi starts the name off on many, then
vf35
16g
gt28r
td04\05

What do all these combinations of letters and numbers mean?

Lastly, I was trying to find online retailers of turbochargers and stumbled across a site that deals a few garret ones. They list the specs for them,

here is an example:

HKS GT2510 - 300 PS Output

COMPRESSOR: -Wheel- 63 Trim - 47.7 Inducer / 60.1 Major -Housing- 60 Inlet / 50 Outlet - 0.60 A/R TURBINE: -Wheel- 62 Trim - 53.0 Major / 41.7 Exducer -Housing- GT25 inlet / Internal GT25 oulet - 0.64 A/R

Can someone clarify what each individual specification means? What are type of measurements are these numbers assumed to be in?


jason

Bigger wheels/bigger compressor housing means it's a bigger turbo. Smaller the turbo the less time it takes to spool. Vise versa for large ones.http://www.bbs.legacycentral.org/viewto ... 84&start=0. Don't know if this helped any.

You're pretty much asking us to write you a book on a topic that's already written about.

I suggest reading Maximum Boost by Corky Bell, to get you up to speed.

boostjunkie wrote:You're pretty much asking us to write you a book on a topic that's already written about.

I suggest reading Maximum Boost by Corky Bell, to get you up to speed.

fair enough :\

anyone know of an online copy of it? found it on amazon for 30 bucks :\

As far as I know nobody's pirated the book electronically... If you can't afford $30 for the book maybe you could convince your local library to purchase it.

While we're recommending books, I think Turbochargers by Hugh MacInnes is also a very good book on turbos. It's a little older but it covers the basics well. I think Turbochargers and Maximum Boost complement each other.

This might help you with some things
http://www.stealth316.com/2-3s-compflowmaps.htm

Read Up!

91White-T wrote:This might help you with some things
http://www.stealth316.com/2-3s-compflowmaps.htm

Read Up!

thanks much for the link
and i broke down and bought the book today

dont forget this one too.

shatowz wrote: What exactly makes the turbos measure large? Is it the size of the turbine wheel? the size of the compressor? of both combined? What is the logic to referring to a turbocharger as 'big' or 'small'?

Most people when referring to a turbo being big or small are referring to the compressor wheel. That is the wheel that pushes the air into the engine. In most cases, the larger the wheel, the greater the time it takes to produce boost or "spool."

shatowz wrote: also is there a logic behidn the turbocharger names?
some of the names that i've commonly heard are:
ihi starts the name off on many, then
vf35
16g
gt28r
td04\05

What do all these combinations of letters and numbers mean?

Most of those turbos listed above are "large" compared to the IHI RHB5 that comes on the Legacy turbo. IHI usually uses VF?? as a way to identify their turbos. Their model numbers usually are not as descriptive as other turbo manufacturers. For example a VF34 has a ball bearing turobcharger cartridge, an F55 wheel, and uses a size 18 exhaust housing. None of those numbers or specifications show up in the model number, VF34.

Mitsubishi turbos are usually easy to identify, for example, a TD05H-16G is a TD05 turbine wheel, the H stands for High flow exhaust housing, in Subarus that would be the 7cm housing, the 16G part refers to the compressor wheel size. Mitsubishi has MANY different sizes, in their G series, the bigger the number the bigger the wheel, the more power it can make, but the laggier it may be if not combined with the correct turbine.

We do not deal with many Garret turbos other than just simple rebuilds so I am not very versed in how they list their specifications in their model numbers.

I hope this has been of some help