News member, New truck, looking for input

[Robert6401]

Originally Posted by cleatus12r

Believe it or not, the early wheel, albeit less likely to surge, actually flows less air and is not as efficient as the stock wheel. So hold off on that until you know you need it.

Cody, this is the first time I have heard this. I was planning to upgrade to a Wicked Wheel to eliminate the surging I get, but am not crazy about the fact that it will flow less air. What causes them to have more of a whistle?

[cleatus12r]

That's how surge is eliminated: Less airflow at relatively low compressor wheel speeds. By looking at a compressor efficiency map, the surge line is on the far left of the "island" where the pressure ratio is too high for the actual airflow through the compressor. In simpler terms, the boost is too high for the actual amount of airflow through the engine and the compressor flow comes way out of it's efficiency range.

A ported compressor housing (such as the ATS unit) also slightly lowers flow.

The noise is simply a function of the impeller design. The staggered-height vanes aren't as "clean" as the standard 99.5-03 impellers as far as chopping up the air is concerned.

[epowers777]

I heard the earlier trucks had the wicked wheel is that true? I would do the 80 hp daily seems to work the best for me and Im mostly stock. Mpg I mean!

[907DAVE]

Yup........same wheel.