how to know the trim?

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08-08-2006, 06:14 AM

underboost

0.0 BAR

Thread Starter

Join Date: Apr 2006

Posts: 20

how to know the trim?

how to know the trim of my turbo charger? all data i found is:
gareet t3/t4
t04e
and serial xxxxxxx
a/r 50

so how to know the trim ?

08-08-2006, 01:48 PM

PureCRXtasy

1.5 BAR

Join Date: Dec 2002

Posts: 1,065

Re: how to know the trim?

measure the inducer and exducer and do some math

trim = (inducer diameter / exducer diameter) 2 * 100

08-08-2006, 02:37 PM

BLAAST

1.5 BAR

Join Date: Oct 2004

Posts: 877

Re: how to know the trim?

The actual formulae to calculate the trim of a wheel is:

trim = ( (inducer diameter) 2 / (exducer diameter)2 ) X 100

---- I am just realising now that squaring the measures before or after dividing them makes no difference at all. Funny... I always thought it HAD an influence on the result.

08-08-2006, 03:04 PM

PureCRXtasy

1.5 BAR

Join Date: Dec 2002

Posts: 1,065

Re: how to know the trim?

Squaring the numbers prior to or after the division makes no difference, you'll get the same result either way.

Ex. Inducer = 10
Exducer = 21

102 = 100
212 = 441
100/441 = 0.22675736961451247165532879818594
0.22675736961451247165532879818594 * 100 = 22.675736961451247165532879818594

10 / 21 = 0.47619047619047619047619047619048
0.476190476190476190476190476190482 = 0.22675736961451247165532879818594
0.22675736961451247165532879818594 * 100 = 22.675736961451247165532879818594

08-08-2006, 03:11 PM

Walter

3.0 BAR

Join Date: Apr 2006

Posts: 2,057

Re: how to know the trim?

my eyes!!!

08-08-2006, 03:55 PM

HMTguy

Guest

Posts: n/a

Re: how to know the trim?

Thanks for carrying it out to that 32nd decimal place. 31 just isn't accurate enough for me.

08-08-2006, 04:12 PM

PureCRXtasy

1.5 BAR

Join Date: Dec 2002

Posts: 1,065

Re: how to know the trim?

Quote:

Originally Posted by jagojon3

Thanks for carrying it out to that 32nd decimal place. 31 just isn't accurate enough for me.

No prob. I just thought 64 would be overkill

08-08-2006, 06:16 PM

underboost

0.0 BAR

Thread Starter

Join Date: Apr 2006

Posts: 20

Re: how to know the trim?

sorry if i ask can you send me a pic and tell me what is the inducer and the exducer
to can measure them .? sorry because my english is not good.

[

08-08-2006, 11:21 PM

PureCRXtasy

1.5 BAR

Join Date: Dec 2002

Posts: 1,065

Re: how to know the trim?

You have to take the compressor housing off. The inducer is the front, smaller part of the compressor wheel and the exducer is the larger part that pushes the air into the compressor housing. A digital caliper comes in real handy for this part.