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cole930 cole930 is offline
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Join Date: Mar 2000
Location: Auburn,In. U.S.A.
Posts: 2,449

The K27 HFS is a great Turbo but not necessarily for what you want. Your going through what all of us have done. First thing to do is decide how the car is going to be used. Road car or Street car, Track car or no track car. You said street car.

On a street car your looking at quick spool, tune for the engines torque curve, no lag, lower to mid range cams, modified timing, and good fuel control. The K27 7200 and K27S are good reliable Turbos with quick spool up and will give you all you need if your using the torque curve and shifting around 5600 - 5800RPM. You'll hear everyone raving about shifting at 7500 RPM but once you have exceeded the torque range the extra RPM is just creating noise not power. There are better Turbos out there but the K series are plentiful, easily rebuilt, reliable, easy to install, and reasonably priced.

You don't need to go 160MPH on the street. Your K27HFS is made for big boost all the way to whenever you shift, for that you need large headers, higher rpm, higher torque range, mid to high range cams, more fuel, head work, better pistons, on and on. You'll make good HP but boost won't even start until past 3500 - 4000 RPM, and you'll be running 7000 - 7500 RPM to optimize what you have. And the engine needs to be built to handle the high RPM, HP, and Torque, if it isn't built correctly for the power you'll have a 4 wheeled hand gernade.

With my set up the only timed run I ever did was 12.13 @ 126 MPH. No hole shot, street tires, and shifting at 5,600 RPM.

Cole - 80 930 "The Old Sled"
Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.

Last edited by cole930; 04-22-2010 at 08:49 PM..
Old 04-22-2010, 08:45 PM
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