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What is an AR ratio?
Why is it best to be close to 1.0 (and what does A and R stand for)
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to put it plainly all it is is a number which indicates how much a turbo's exhuast housing will flow. It can only be compared to other turbo's from the same family, ie: a T04 0.96A/R flows more than a T03 0.96A/R.
it is explained very well in a book called Turbochargers by Hugh MacInnes, i think the A = Area, R = Radius, cause that is how the number is figured out, the area of the inlet runner at a certain place divided by the radius of it in a certain place. ------------------ http://strx7.250x.com/hwosig.jpg This has been another important news bulletin brought to you by HWO |
It's the amount that the "snail" part of the turbine housing contracts it's diamater (or area A) vs the radius (R) from the turbine centerline as it scrolls around the "snail". The Area/Radius is constant throughout the turbine housing, as the cross-sectional area decreases as it scrolls closer to the turbine (i.e. as radius is decreased). I wish I could draw you a picture.
It basically controls turbine speed by determining the gas velocity to the turbine. A larger A/R slows down the turbine to allow for more power, while a smaller A/R speeds it up for better low-end response. It all depends on what you want the car to do, and what kind of turbo you are using. ------------------ 88 RX-7 20B/T66 Money Pit 88 RX-7 TII Daily Driver 84 RX-7 GS Driving School Beater 00 F-150 Recovery Vehicle |
"SNAIL"
There's a snail in a turbo! Shit! Just when I thought I had it all figured out you guys came and confused me even more! HA HA HA! crispeed 87TII 9.74@139mph ------------------ |
Yeah, that's why they cost so much... depends on the going price of escargot. Laugh as you may, it's the most important part of the turbocharger as it gives it that added "kick", much like the worm in tequila.
Actually, it's more like a chambered nautilus, but I figured that some people wouldn't know what that is. https://www.rx7club.com/ubb/smile.gif https://www.rx7club.com/ubb/smile.gif https://www.rx7club.com/ubb/smile.gif ------------------ 88 RX-7 20B/T66 Money Pit 88 RX-7 TII Daily Driver 84 RX-7 GS Driving School Beater 00 F-150 Recovery Vehicle |
Originally posted by Evil Aviator: Actually, it's more like a chambered nautilus, but I figured that some people wouldn't know what that is. https://www.rx7club.com/ubb/smile.gif https://www.rx7club.com/ubb/smile.gif https://www.rx7club.com/ubb/smile.gif Scott Neville VP RX-7 Club of Florida SPiN Racing Inc. 1974 RX-3 ITA/EP 1979 EP 1983 GS Ltd. Ed. Turbo 1984 ITA/7 1987 TII 1987 Sport 1988 GXL 1988 TII 1988 RX-7 20B (Evil Aviator's) |
Are you threatening me?
http://is.dal.ca/~ceph/TCP/JBW047.jpg Hehehe... get this: The web site where I got this pic says that the Nautilus is evolutionally related to racing snails! |
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