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: : JWT Sport 650's : : Mike : Hi Mike. If you're looking for more efficient turbos that are very streetable, the Greddy TD-05 18Gs are a nice setup. I made 554 RWHP in the mile high city of Denver on the hottest day of this summer (96 degrees), at only 17.5 lbs of boost, a stock clutch, and on an engine with 188K miles on it.... with stock internals, no less, and with no water injection system or NOS. (Dyno sheet available upon request). These turbos have lots more power potential than the 554 I made. I'm sure you will do much better as you upgrade your turbos. I know this setup works very well, but the gains are due to the superior Greddy manifold. The Sport 650's are actualy more efficient turbos but the stock Nissan manifolds are awful for flow and reversion resistance. In my case I decided to go for Mike Smith modifed stock manifolds because the car is such a bitch to work on in this area and I am worried that the Greddy manifold will crack as it has a reputation to do. I would really like a tubular header and external wastegates but I dread having to deal with leaking and cracking. I wonder about the 550+ hp @ 17 lbs though, according to my compressor and turbine maps for that turbo, it should not be posible, the compressor does not flow enough at that pressure ratio, at least with any reasonably expected BSFC and VE. The math does not come close to working out. Also there is no way that the stock clutch can come close to containing that amount of power on the dyno. I smoked a few on the dyno that are way more clutch than stock until I found a combination that would hold. Finaly if you look up the dyno chart comparo form a few months ago, which compared, my car with sport 650's, bernies car with GT2530's and Zoe's car with the Greddy setup you will find that my turbos had the least amount of lag, best low end torque, greatest amount of torque by far and the greatest area under the power curve of any of these set ups even though Zoe had the best peak power. With this bit of retuning, my power peak is real close to Zoe's now with an even broader powerband and lots of torque. This goes to show that Sport 650's are not laggy! Mike
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