Mr All-Motor has a turbo question for once. I was reading in the thread here about people over 18psi and I saw www.hahnracecraft.com/hahn/parts/turbo%20efficiency.htm linked from HRC. I noticed the S20G is more efficient over more output levels than the other 16g twins. It looks like it operates in the 70-80% efficiency range. This got me wondering, is there any turbo that operates at a higher efficiency rating? Is it possible to attain 99, 100%? What are the benefits to this level of efficiency? Cooler intake charge and thus more power? Thanks!

I don't think there is such a thing as a 99-100% efficient turbo cause physics prevents that from happening. I mean, the little friction whether it's from the oil, the heat, etc, keep this from happening imo. Don't know much about turbos but judging from my physics class, 99-100% is pretty much impossible. Maybe a turbo in the 80-90% efficiency may be more possible – 100, No.

-------jezreel
hrc stage 1, sfmu, ml, prokits, egt, boost gauge, apexi tt, turbo xs rfl, haydans tranny cooler, costum dp, dr. uber groundwires, dynotune fp gauge. gst muff, turbo spoiler

nothing like driving with the windows down and the music low: i love hearing the turbo spool, swwwhhhttt!!!!
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inlet air and exhaust charge velocity within the housing can be controlled to a maximum with different angles of clip on the blades or ball bearings.. but as mentioned, it is impossible to obtain anything over a 95% efficincy rate when you have an obstruction directly inline of the exhaust path... as for the most efficient set-up?.. I don't think it can be narrowed down to one turbo.


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boosted 420a and ej2o..(my 2liter v8 eaters)