Differences between a small 16g and big 16g

[shaggyslaser]

I searched, and there was a picture that was referenced which looks like it'd be mighty helpful, but was no longer available. Anyways, to the point. I am looking into buying a big 16g. I currently have a 16g, but am unsure of what turbo it is, I think it is an Evo3. The only reason I am looking to buy this big 16g was to have it rebuilt, but my current turbo was involved in an accident and forced the compressor housing to the wheel and bend the blades. Can I use the big 16g housing and wheel to replace mine?

 

[phillabaum03]

under TD05 there should be a number like 42, or 47 and theirs another one but I believe 47 is the EVO III, correct me if im wrong guys

 

[snowborder714]

http://www.dsmtuners.com/forums/newbie-forum/57878-what-turbo-merged-18.html#post151311464

 

[shaggyslaser]

And this is on the compressor housing I assume? what about my other question, can I replace the compressor housing and wheel?

 

[Dserge]

And this is on the compressor housing I assume? what about my other question, can I replace the compressor housing and wheel?

Yes it is on the housing.
I believe the small and big use the same housing. Even the 14b uses that housing. The only difference is the guts of the turbo.

 

[JusMX141]

Small 16G on left, Big 16G on right:

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If your current turbo is a Small 16G, the center housing will have to be machined to allow the Big 16G wheel to fit. Otherwise, all of the parts are interchangeable.

 

[DSM1G90]

What's interesting that the 14B wheel's vanes are of the same height, yet the 16G wheel's vanes are staggered. Anyone know know the reason Mitz made the two differences and not just have one wheel style, esp if the latter has more potiental?

thx - DSM

 

[JusMX141]

What's interesting that the 14B wheel's vanes are of the same height, yet the 16G wheel's vanes are staggered.

Not exactly.

14B: Inducer 1.695", Exducer 2.285".
Small 16G: Inducer 1.830", Exducer 2.365".

If you want to talk about two wheels that are ridiculously similar in size, check out the Big 16G and Evo III 16G compressors. The Evo III wheel has a .010" bigger inducer....the thickness of two sheets of notebook paper. The real difference is the thickness of the blades.

 

[1pt5barboost]

jusmx141

When you say blade thickness, are you talking about the height from the back face of the compressor to the top part of the blades. That's the Trim number, right?

 

[JusMX141]

I'm talking about the thickness of the actual blade itself. The Evo III's compressor blades are thinner, making the wheel lighter than the plain Big 16G's wheel. This also means the Evo III wheel is much more fragile if you're prone to sucking large items through your turbo.

Trim is a calculation of the difference between the inducer and exducer measurements. It's a measure of how "steep" the blade's angle is. This is why a turbo's trim has nothing to do with the acutal size of the turbo; a turbo with a 1.5" compressor inducer can be the same trim as a turbo with a 3" inducer.

 

[1pt5barboost]

Okay, so it's not the trim that allows for the mass flow of air. In another thread, I was just reading that

Small 16G 505CFM @ 14.7psi and 490CFM @ 22psi
Large 16G 550CFM @ 14.7psi and 520CFM @ 22psi
20G 600CFM @ 14.7psi and 695CFM @ 22psi

Why is there a 10% increase in flow if such a small change in diameter?

 

[DSM1G90]

Why is there a 10% increase in flow if such a small change in diameter?

Looks like with that larger blade area, the flow is increased - like a small, 3 blade fan against a slightly larger fan with the same number of blades - more surface area to push air.

..along with the same size of housing (TDO5H) along with the larger blade surface area to increase this flow.

The real difference is the thickness of the blades.

..and obvious the thickness of the wheel blades means how more quicker that thing can spool up against the thicker B16G wheel blades