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Originally Posted by ecoli
A 20G is not a big turbo they spool pretty fast, it has a little more flow capability than the EVO III 16G, but it still runs out of steam on the 2.0 at higher boost. The EVO III 16Gs are not nearly as small as the old regular 16G and "Big 16G". People are making around 400whp with the EVO III 16Gs. You were lucky to make 350whp with the old Big 16G. Getting over 425whp out of a 20G takes some work. He already has the EVO III 16G and doesn't want to spend money on something else, that is probably the major reason he is sticking with it.
Why are you running 18psi while breaking in a clutch? You are supposed to take it easy during clutch break-in and not boost the car at all.
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The evoIII does not flow significantly more than its big or small cousins but I dont have the compressor maps handy to see exactly what they flow(the compressor wheel is ligher so it spools faster but doesn't flow that much more). I did compare them though at one time and IMO a anything less than a 20g is really a waste of money unless your stock turbo dies and you just need something to replace it. Like you said the 20g is not that large of a turbo so its perfectly streetable, they can be had for not that much money (got mine with 6 hours of run time on it for 450), it does require a fmic and injectors but can be run on the stock internals fine, and it has gone 10's. Granted most people wont be running 10's with thiers but there aren't many cars out there that will touch a properly tuned dsm with a 20g and you dont need to keep refilling a bottle to do it
As for the clutch clutch wear is only occuring during engaugement/disengaugement so assuming your taking it easy on the shifts and not launching it you wont be causing any more wear on the clutch by boosting it once its in gear and moving unless one has enough torque to force the clutch to slip once the pedal is fully released and I highly doubt am making enough power to do that with an an act 2900. Also 18psi is about the lowest boost i can run with the external wg.