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Is 23 psi @ 7000 rpm gonna kill my K04s in a drag race?

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Old 05-09-2006, 02:42 PM
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Default Is 23 psi @ 7000 rpm gonna kill my K04s in a drag race?
I have a race with a very fast supercharged cobra coming up so I've been toying with a boost curve with my AVC-R (it's an electronic boost controller)that gives me 24ish psi in the midrange then tapers to 1.55kg/cm? at 6500 which is 22.04 psi but shows 23psi on the gauge.

Anybody got experience with this kind of boost in this rpm territory? Am I being a wus?
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Old 05-09-2006, 02:43 PM
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No: Just don't make a habit of it.
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Old 05-09-2006, 02:49 PM
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Default its perfectly fine...this is gonna be on 93 i assume?
you could even turn it up to 25 lbs, run 100, and add 6 degrees of timing and you'll be golden for a few passes
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Old 05-09-2006, 03:17 PM
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and your motor will look like some peoples on the maha
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Old 05-09-2006, 03:31 PM
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I was under the impression that many K04 homebrewers had MBCs set at 21-23psi
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Old 05-09-2006, 03:41 PM
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Default I'll get the avcr to "learn" on 93(edit: & water injection), but the racin' will be on vp109.
I think I'll still see over 30 degrees of timing without bumping up the timing maps.
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Old 05-09-2006, 03:41 PM
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right, but daily driving, not drag-racing
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Old 05-09-2006, 03:47 PM
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Default Oh no. I'm very happy with my 1.45kg/cm? (20.6 psi) pump gas setup.
CFs are below 6, timing tags 24 degrees repeatedly and it pulls an APR stgIII car quickly. Pumping up the boost will help my fats times with some midrange, but I'm sure it will hurt my horsepower on pump gas.
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Old 05-09-2006, 03:52 PM
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Default The spike is no big deal, the psi at redline is what overspins turbos.
A 24psi spike tapering to 21 is much easier on turbos compared to 23psi straight.
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Old 05-09-2006, 03:57 PM
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?? Daily driver settings should be more conservative than "race" settings for the drags
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