I'm pretty sure the A/R is the inlet vs. outlet sizes. And extrude honing... well, most of the parts are made from casting which leaves a rough surface. Extrude honing uses this slurry mix stuff which they flow through the part which basically polishes the surface smooth(which improves airflow, power, etc).
well I gotta go soon but if you look housing sourronding the comrpessor/turbine then you'll see it looks like a shell. you take the area of the opening at any given place and divide that area by the distance of that opening to the centerline of the compressor/turbine... that's A/R area/radius
A/R is effectively the leverage the gas flow can impart to the turbine shaft, and by extension, the impeller.
A = cross-sectional area of the turbine inlet.
R = radius of the turbine.
A larger diameter turbine (bigger R) will generate more pressure than a smaller one for a given flow VELOCITY at the expense of longer spool time due to higher mass.
As A get larger, flow velocity drops for a given volume of gas but max flow goes up. Smaller A = higher velocity and more leverage on turbine for a given R but will choke at a lower total flow.
A/R = .65 should spool quickly and have good mid-range response with lower total power while the .83 A/R will be a top-end biased unit.
__________________
Bruce in Houston
'94 Nissan Sentra SE-R w/ $tuff, converting to ITA
'98 Suzuki Bandit 1200S w/ $tuff
'02 Dodge Dakota SLT 4-dr tow beast, stock!
Last edited by bahearn : Feb 24th, 2003 at 04:22 PM.
Linear Mode
