cwgtex

Ok I see everyone talking about their turbos using three numbers in series like this:

62/65/14
62/74/13ss

Can someone explain these to me?

omaharam

First number is the inducer side of the compressor wheel in mm.
The second is the exducer side of the exhaust wheel in mm.
The third is the cross sectional area of the exhaust housing in cm squared.

the larger the number, the more air it can flow, but also the slower it will spool.

Justice4all

62, 64, 66 etc. is inducer size of the compressor

65, 71, 74 etc. is the exducer size of the turbine

the 13 and 14 is exhaust housing in centimeters squared.

Matt S

Anyone know how this equates to A/R?

enafzige

Here's an interesting little write-up on A/R...

http://www.moddedmustangs.com/forums...ze-r-trim.html

--Eric

Matt S

Thanks for the link. There has to be a way to compare them though. I understand what the difference is between a small and large A/R.

twoforme2

Yeah, why is it we refer to turbos the way we do instead of the way everyone else does?
Who started this means of identifying turbo's. The numbers can be decieving, because you can have two turbos that are 62/65/14 that are completely different because of the Exhaust Inducer and Compressor exducer sizes.
OR is there some standard that will not allow that to happen? OR am I just overlooking something obvious and am proving that public school really does provide an inferior education?

omaharam

How does everyone else refer to them? Are you asking why no one on this site ever talks about the trim? I agree, if one is going to buy a turbo, you should know the inducer and exducer measurements of both wheels to make sure you're getting what you need.

twoforme2

yeah trim would one to know because not all compressor exducers and turbine inducers are the same size. Obviously if they were it would not matter.
As far as giving A/R ratios again if the radius was always the same then knowing the sq.cm. of the exhaust housing would obviously be required (which they give us) However the radius from the center of the turbine to the center of the exhaust housing is not always the same for every turbo? is it?
So basically it is just one of those things to make you go ...hmmmm...why do that do it that way?