| Go back to previous topic | | Forum name | Turbo/Nitrous Tech | | Topic subject | what does A/R mean and what does it signify? | | Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i8&topic_id=37727 |
37727, what does A/R mean and what does it signify?
Posted by tim97rs, Jan-21-03 07:49 PM
What is a "good" A/R vs. a bad A/R?
thanks
tim
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37783, RE: what does A/R mean and what does it signify?
Posted by DarkOne, Jan-22-03 04:51 PM
A/R is the ratio of area to radius - basically the ratio of the turn and reducing diameter of the housing.
As far as what A/R is good, it's all relative to your goals and your setup. Larger A/R turbos spool slower on smaller engines, because it's a larger housing. However, because it is a larger housing, it flows more and so would work on a higher displacement motor.
Here's an example - a 16g uses a .48A/R exhaust housing. (standard mitsu 7cm2 housing).
A STAR T3/T04E uses a Garret .63 A/R exhaust housing.
The STAR spools slower, but because it will flow more exhaust, it has the capability to support more power. More air in, more air out.
http://wwwrsphysse.anu.edu.au/~amh110/all_gifs/Turbo%20page%20gifs/trim%20ratio
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