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kjmerkel69
 Post subject: Garrett turbos
PostPosted: Mon Oct 13, 2003 1:01 am 
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It wouldn't surprise me if this topic gets locked within 2 days, but here goes...

What do their names mean? I have no clue what a .50 trim T3/T4 hybrid indicates but I am willing to learn. :)

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HondaHunter
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PostPosted: Mon Oct 13, 2003 1:09 am 
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heh yeah...id also like to know what all this turbo stuff is also!!!!

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Ricehunter
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PostPosted: Mon Oct 13, 2003 1:30 am 
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A 50 trim hybird T3/T4 could include quit a few combinations. The 50 trim would be the size of compressor wheel which whould usually indicate a T4 cold side. Then the tubine side would be a T3, but there a wake of opions for that as well. Standard, stage 2 and stage 3 wheels as well as different A/R tubine housings .36, .48, .63 and .82. Here is a link to look throuhg a bunch of options. http://64.225.76.178/catalog/Default.htm Hope that helps you out.
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zspturbo
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PostPosted: Mon Oct 13, 2003 4:05 pm 
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the bigger the number, the bigger the turbo :-D

but yeah the biggest you ever really want on a street driven 2 liter is a t3 (turbine housing)/T4 (compressor housing) 50 trim (compressor wheel) stage III (turbine wheel) with a .63 A/R. I hope for gods sake that you know what the A/R is :D anyways thats a "T3/T4 50 trim stage 3 with .63 A/R"
if you dont, go get "maximum boost" by corky bell... n00b! :P
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Bill Spruill
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PostPosted: Mon Oct 13, 2003 6:21 pm 
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:o Whether you are familiar with these terms or not, "Maximum Boost" by Corky Bell is a great theory reference. Good reading for all. :wink:

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MrGreenGenes
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PostPosted: Mon Oct 13, 2003 6:43 pm 
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on the topic of a/r, does anyone know what the 11b, 14b, 16g, etc... turbine and compressor a/r's are?? the only thing i know is that mitsu measures the area of the inlet... i guess i could measure it eh?

phil

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Ricehunter
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PostPosted: Mon Oct 13, 2003 7:44 pm 
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Quote:
on the topic of a/r, does anyone know what the 11b, 14b, 16g, etc... turbine and compressor a/r's are?? the only thing i know is that mitsu measures the area of the inlet... i guess i could measure it eh?

phil
No, Mitsu actually measures the A/R in metric terms. 7cm is close to a .48, 8cm close to a .63 ect.
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kjmerkel69
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PostPosted: Mon Oct 13, 2003 8:26 pm 
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I hope for gods sake that you know what the A/R is :D

... n00b! :P
Um, no I don't... :oops:

I'm guessing T2/T3/T4 and Stage I/II/III are just numbers with no finite meaning, but what about .50 trim? Is that a ratio or what? Ditto for the A/R ratio.

Enlighten me, please! :)

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Bill Spruill
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PostPosted: Mon Oct 13, 2003 9:56 pm 
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Maybe this will help:
A/R (area/radius) ratio is a method of fine tuning between basic sizes. Imagine the turbine housing as a cone wrapped around a shaft to look like a snail. Unwrap this cone and cut off a small tip for the discharge area. The area of this hole is the "A" (area) [The "R"(radius) is the distance from the center of the hole to the center of the turbine shaft... difficult to show by words.] A smaller R will impart a higher rotating speed to the turbine; a larger R will give greater torque. A simplified summary: a larger A/R goes to more power while a lower A/R goes to better low-speed response. It is really more theoretically involved. Read "Maximum Boost" p. 32

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The Ethereal
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PostPosted: Tue Oct 14, 2003 5:58 am 
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CamZR4
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PostPosted: Fri Oct 17, 2003 3:21 pm 
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The Garrett Trim numbers for compressor wheels are not always higher number = bigger wheel/more flow.
the trim numbers come from an equation of the inducer and exducer measurements, I can't remember what the formula was now, but I think it was something along the lines of the trim being related to the difference between inducer and exducer measurements.
But the bigger number = bigger wheel is pretty much true within any range/series of wheels (ie T4), you will notice that the GT wheels have smaller trim numbers than the comparable T4 wheel (with similar flow numbers).
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Loun
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PostPosted: Sat Oct 18, 2003 12:26 pm 
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I have a garett t3/t4 (to4e) 57 trim with a .63 AR and stage III exhaust that i was going to be putting in one of my XR4TIs if anyone is interested in seeing pics of one ...

http://www.loun.net/uploads/turbo01.jpg
http://www.loun.net/uploads/turbo04.jpg
http://www.loun.net/uploads/turbo05.jpg
http://www.loun.net/uploads/turbo07.jpg

Before I put it on the car though it will get swapped to a 50trim as the 50 trim has a much better compressor map and larger efficiency range.


http://www.loun.net/uploads/npric02.jpg
http://www.loun.net/uploads/npric03.jpg

is the NPR IC I will be using as well ;) i put it infront of my 84 colt for a laugh

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