A/R

[t3intercooled]

I was curious when buying a turbo and they have the option of a Buick .63 A/R or a Buick .85 A/R What exactly do they mean and how do I figure which will be efit me more?

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[earlbrown]

Imigine you have a pinwheel and a compresses air nozzle. If you spray the outside of the blades it'll spin.... If you aim the nozzle closer to the center, it will rev to the moon with the same pressure/flow.

.63 would be hitting close to center and .85 would be spraying the edge. The .63 housing will give more exhaust restriction but the .85 will offer less restriction since it's not imparting as much work into the wheel.

 

[turbo nasty]

http://www.turboneticsinc.com/content/ar-ratios