Don Johnson

Say I have a stock motor and I get a t3/to4E in 46 trim and another t3/to4E but a 57 trim.

Would the difference in power output be huge? Figure they are at 8 psi

Both have the compressor A/R of .7 and a turbine A/R of .6. The only difference is the trim size.

Any help? And input

Flamenco-T

Trim size is basically all about efficiency at the level that your car is at.

For example, a 46 trim turbo will be at the most uttermost efficient at 10 psi at 3000 RPM, while the 57 trim may be at 12 psi at 4200 RPM. This is just a numbers, not representing what it is.

Now how much power you can make is depending on your motor setup, if you;re going to stay at low boost and wants to make the turbo perform as efficient as you can then go with the smaller trim. Consider your long term goal as well because obviously, the 46 trim will go out of efficiency a lot sooner than the 57 trim.

It's all a trade off, quick spool for lower top end, or slow spool for more top end. You just have to find the best median to your application. Bigger is never necessarily better.

stan

DIRep972

iTrader: (1)

Trim is an indicater of the relationship between the size of the inducer and exducer wheels. The closer the trim is to 100, the closer the inducer/exducer are in size. You can find trim of a compressor wheel by taking (inducer X inducer) / (exducer X exducer) X 100 = trim

The main indicator of power is the size of the inducer wheel. For instance 61mm & 67mm are popular compressor inducer sizes. Some family's of wheels like the E family(the one u have) do not tell you the inducer spec, they just tell you the trim.

The E family of wheels almost all use the same exducer size, so in the case of the E family, the trim also indicates to you the size of the inducer wheel, which indicates power. Though there are some discrepencies in this, like the 50 trim and 54 trim E family. The 50 trim uses a 3.0"" exducer while the 54 trim uses a 2.9" exducer, so the 50 trim actually has a larger inducer wheel then the 54 trim which means it flows more air and makes more power. But because of the relationship between the inducer/exducer, the trim is actually lower.

Between the 46 trim and 57 trim, you definitly want to go w/ the 57 trim. It will make a significant amount of power more then the 46 trim.


Modified by DIRep972 at 8:30 AM 9/17/2004

Don Johnson

The turbo is for my H22 Prelude. I will be boosting, say 8 psi on the 46 trim. My goal is 250+ at 8psi. Is the 46 trim too small, or is the quicker spooling actually going to be better, since I will be making power down low.

so the dilemma is which is the better match up,

the 46 trim I have, or maybe getting a 57 trim.

Thanks for your imput guys

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DIRep972 &raquo;</TD></TR><TR><TD CLASS="quote">The 50 trim uses a 3.2" exducer while the 54 trim uses a 3.0" exducer, </TD></TR></TABLE>


I made a mistake, the 50 trim uses a 3.0" exducer while the 54 trim(and almost all the rest) use a 2.9" exducer. just thought id clear that up if anyone was still reading this.

Flamenco-T

almost right the 50 trim is the only one that uses 3.00 exducer, while all the trim in the E family such as the 46, 54, 57, 60 trim u ses the 2.95"

Like Chris said, the inducer is what made up the trim size.

Stan

Don Johnson

So is the 46 trim too small for the "big 2.2L". Will it put out enough in the higher rpms/not fall off?

Thats my main worry, is that I mismatched the turbo

Don Johnson

TTT

DIRep972

iTrader: (1)

The 46 trim will make decent power, and the 57 trim will make more. For your goal of 250whp @ 8psi im sure either one would get you close. just make sure you have a good flowing turbine side on the 2.2L

Don Johnson

the turbine A/R is .6