Measurement

03slobra · 01-21-2008, 07:33 PM

How can you tell how many mm a turbo is?And how much boost its capable of?Just curious

coupe · 01-21-2008, 07:54 PM

1)The size in mm is a generic measurementof the turbo...it's the diameter of the inlet of the compressor wheel; the tip-to-tip measurement of the blades. However, other parts of the turbo determine it's application just as much as the size of the compressor wheel. For instance, a "66mm" turbo found on a diesel will not do so well on a gas-motor and vice-versa.

2)Several factors determine the boost a turbo can make. A good place to start is something called a compressor-map. It is a fluid-mechanical diagram of the compressors ability to flow air...ultimately making horsepower.

QWKSNKE · 01-22-2008, 04:58 AM

Quote:

Originally Posted by coupe

1)The size in mm is a generic measurementof the turbo...it's the diameter of the inlet of the compressor wheel; the tip-to-tip measurement of the blades.
.

The entire wheel or just the blades visible at the inlet?

coupe · 01-22-2008, 07:56 AM

Inlet only. The overall diameter is not a common measurement, but it is used to calculate the "trim" of the compressor.

LeeH · 01-22-2008, 08:27 PM

You measure the inducer and exducer to get the area to radius, The turbine A/R tells about when it will spool and the compressor A/R will tell how much air it will move. Identify the turbo then find its compressor map, This will tell you everything you want to know.

coupe · 01-22-2008, 10:02 PM

Quote:

Originally Posted by LeeH

You measure the inducer and exducer to get the area to radius

Incorrect. You measure the area of the volute at a certain radius from the centerline. It is an attribute of how "tightly would" the shape is.

Quote:

The turbine A/R tells about when it will spool and the compressor A/R will tell how much air it will move.

Along with the turbine wheel and compressor wheel in those housings.

03slobra · 01-25-2008, 07:13 PM

This is a garret turbo it says A/R 76 on the intake housing.It is 3inches from tip of blade to tip on the front.So what size is this turbo?

04 Mach1 · 01-25-2008, 08:03 PM

Post up a pic of the monster.

LeeH · 01-25-2008, 08:21 PM

Quote:

Originally Posted by coupe

Incorrect. You measure the area of the volute at a certain radius from the centerline. It is an attribute of how "tightly would" the shape is.

Along with the turbine wheel and compressor wheel in those housings.

Sorry, I was thinking A/R but inducer/exducer gives trim.

EHardy1971 · 01-26-2008, 10:31 AM

Quote:

Originally Posted by 03slobra

This is a garret turbo it says A/R 76 on the intake housing.It is 3inches from tip of blade to tip on the front.So what size is this turbo?

That particular model number sounds familiar!

01-21-2008, 07:33 PM	#1
03slobra Senior Member Join Date: Nov 2006 Posts: 488	Measurement How can you tell how many mm a turbo is?And how much boost its capable of?Just curious __________________ Preston 1947 mercury 2door coupe 331w/tko 600 project 2003 f350 5in lift 6.0 with upgraded stuff!!!

01-21-2008, 07:54 PM	#2
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	1)The size in mm is a generic measurementof the turbo...it's the diameter of the inlet of the compressor wheel; the tip-to-tip measurement of the blades. However, other parts of the turbo determine it's application just as much as the size of the compressor wheel. For instance, a "66mm" turbo found on a diesel will not do so well on a gas-motor and vice-versa. 2)Several factors determine the boost a turbo can make. A good place to start is something called a compressor-map. It is a fluid-mechanical diagram of the compressors ability to flow air...ultimately making horsepower. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

01-22-2008, 07:56 AM	#4
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Inlet only. The overall diameter is not a common measurement, but it is used to calculate the "trim" of the compressor. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

01-22-2008, 08:27 PM	#5
LeeH Senior Member Join Date: Dec 2005 Location: The conservative underground Posts: 341	You measure the inducer and exducer to get the area to radius, The turbine A/R tells about when it will spool and the compressor A/R will tell how much air it will move. Identify the turbo then find its compressor map, This will tell you everything you want to know. __________________ 89LX Hatch 89LX Coupe 89GT 90GT 93GT

01-25-2008, 07:13 PM	#7
03slobra Senior Member Join Date: Nov 2006 Posts: 488	This is a garret turbo it says A/R 76 on the intake housing.It is 3inches from tip of blade to tip on the front.So what size is this turbo? __________________ Preston 1947 mercury 2door coupe 331w/tko 600 project 2003 f350 5in lift 6.0 with upgraded stuff!!!

01-25-2008, 08:03 PM	#8
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	Post up a pic of the monster. __________________ 89 gt 2.3 stroked holley head with n12n port high flow intake with great big fart can skunk 2 seat belts with kool glow water squirters and new light up shift knob basically everything from wal-mart art carr C4 10.53@127.3 w/ 1.53 60' 89 gt vert 347 eldebrock heads and intake AOD w/3000 stall unknown with 5spd went 12.7 on steet tires 04 Mach1 automatic flowmaster K+N drop in 13.9