| between the 62T and 63T compressor wheels is in the inducer bore size. This is the smaller diameter of the compressor wheel at the front of the compressor. The 63T has a slightly larger inducer diameter than the 62T. The effect this has on the compressor's flow and pressure is as follows: Major diameter (exducer) staying the same, a larger inducer bore will flow more volume of air at lower pressure, but have a lower peak pressure as compared to a wheel with a smaller inducer bore. The geometries of the wheels (inducer and exducer diameter) affect how the compressor wheel behaves and all things being equal, the above theorem is true. However, putting the wheels in different housings also affects how they perform. I have never seen an HKSGT2530 compressor flow map so I dont have anything more than the general trend to work with. Given that, it is hard to say with any certainty if the 62T or 63T is going to produce more power at any given RPM. I would venture to say that the 63T compressor wheel is going to get spooled up a little quicker (beacuse it will flow more air at a lower pressure vs. the 62T) and help the engine produce low and midrange torque a slight bit earlier than the 62T, but once things are spooled, the 62T is going to offer slightly more peak power (beacuse it will be able to produce a little more boost pressure at higher RPM). The thing is, the differences between them is very small and how much this difference will show itself would vary dependent on how much power the car is making. This is a simplification on the logic though - it has more to do with where you fall in the compressors' flow/pressure cabilities and efficiencies, but in general, what I have said above holds true. Normally when comparing compressor maps, you have more significant differences in the trim; i.e. 52-trim, 56-trim, 60-trim, 62-trim, etc etc. FWIW, I tuned an HKSGT2530-powered TT belonging to Mike Vale, which crunk out an amazing 704 horsepower to the wheels at 2bar.
[ ashspecz.com ]
[ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
Albert Einstein
|
