Grandnat said:what all do you want to know? that is a broad question.
but the deffinition of A/R is area/radius. and USUALLY when people talk about A/R they are reffering to the exhaust housing although both compressor and exhaust housing have an A/R ratio.
"A" (area) is the cross sectional area of the scroll and "R"(radius) is the distance from the center of the scroll to the turbine shaft.
the smaller the area in relation to the radius means a smaller (or "tighter") A/R ratio....in the real world this means a high backpressure, fast spooling turbo!
the opposite, large A/R, typically means a slower spooling turbo with a better topend (lower back pressure).
you can think of the A/R ratio as "tuning" a particular turbine wheel.
the choice of a appropriate compressor wheel should be your first concern........the housings are cheap, you can have several around with different A/R ratios and just see which one you like.....you can have one for the street, one for the track...and one for the road course.
oh and yeah...... basically your right on.badmuthrfkr said:So basically a smaller number A/R such as .59 would spool quicker than a .96, but the .96 would make for better top end?
LOL..it's a definite compliment. Even though you arent a Supra owner I would definitely trust your automotive knowledge and advice.Grandnat said:I am not sure if that is a compliment or a slap in the face .....
but its cool with me silver.....your ok in my book, you can insult me anytime......as long as you intermingle it with a compliment (or two)