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Cobra Forums
2013-14 Shelby GT500
4.0L Whipple performance
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<blockquote data-quote="forcefedjunkie" data-source="post: 15339180" data-attributes="member: 11105"><p>I recently installed headers and 4.0L Whipple on the car with 4.0" pulley and 10% overdrive crank pulley. This was "supposed" to result in about 17-18 psi max. Was running 16 psi with the stock 2.3L and could count on max boost below 3000 rpms. Now at 4000 rpms I'm only seeing about 13 psi, at 6000 15-16 psi. The boost curve is more like a centrifugal blower than a twin screw, at least from what I've experienced on the past. Is this normal for this blower? I was able to find another dyno graph from a car running this blower but with a 23# pulley, and he hit max boost at about 3200 rpm. Just wondering what others are seeing.</p><p></p><p>Todd</p></blockquote><p></p>
[QUOTE="forcefedjunkie, post: 15339180, member: 11105"] I recently installed headers and 4.0L Whipple on the car with 4.0" pulley and 10% overdrive crank pulley. This was "supposed" to result in about 17-18 psi max. Was running 16 psi with the stock 2.3L and could count on max boost below 3000 rpms. Now at 4000 rpms I'm only seeing about 13 psi, at 6000 15-16 psi. The boost curve is more like a centrifugal blower than a twin screw, at least from what I've experienced on the past. Is this normal for this blower? I was able to find another dyno graph from a car running this blower but with a 23# pulley, and he hit max boost at about 3200 rpm. Just wondering what others are seeing. Todd [/QUOTE]
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2013-14 Shelby GT500
4.0L Whipple performance
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