Quote:
Originally posted by chrisr_nz
Gonthrax,
Firstly, cheers for the welcome ... can't believe how much stuff I've found on here that I've been looking for for AGES. 
Secondly ... after your cool explanation on A/R, what's the deal with the letter after the compressor wheel size? I think the 20 in 20G indicates the physical size of the wheel (if not, correct me!) and the G indicates the angle/cut of the blades which effects the boost curve or how hard the turbo "kicks".
Got an explanation for this too?
Thanks,
Chris
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Well I beleave your right on this one. The "13G" in the model name refers to the compressor wheel. The "13" is the size and the "G" is the style. The 13G wheel has an exducer (or base) diameter or 2.000" and an inducer diameter (air intake opening) of 1.580". "B"-, "C"-, and "T"-style compressor wheels have all blade tips at the same height. "G"-style wheels have blade tips at two heights, alternating high and low. Blades are always evenly spaced, but the number of and pitch of the blades can change between models. 9B, 13G, and 15G wheels have 12 blades while 18T wheels have only 6 blades.