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Smart quod bastardus
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what boost limit for track days?
How much boost is ok to run for track days? I am contemplating installing a 1.0 bar spring in my 1979 930 and the only mods to the car are the following:
K27HFS turbo GSF exhaust headers B&B intercooler stock Porsche wastegate stock CIS with no other fuel enrichment devices. AM I asking for trouble or will a 1.0 bar spring still not be too much for hard track driving? Need some real experienced users to chime in as I do not want to find out the hard way that this was a bad idea. Thanks, Fred |
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08-31-2007, 01:57 PM
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NASA instructor
Join Date: Oct 2001
Location: San Jose, Ca
Posts: 316
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When you leave two black stripes from the exit of one corner to the entrance of the next you have enough boost.
 (Paraphrase Mark Donahue quote).
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Matt Rich 1999 Porsche 911 Zeniith Blue 1999 BMW 540i 2011 BMW 535i |
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08-31-2007, 02:40 PM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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If you use that 1 bar spring, you need to use 100 octane unleaded race gas, for sure.
I would STRONGLY suggest that you check your AFR's before doing the DE event, too. 
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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08-31-2007, 02:42 PM
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Insert Tag Line HERE.....
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i ran a 1.0 spring for many, many hard track days (a few years), as do just about every other turbos out there and never had a problem. As steve mentioned, make sure your AFM is right and you use high octane.
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08-31-2007, 05:48 PM
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Herman the German
78 Porsche 911 Turbo
1972 porsche 72 rsr clone
1995 porsche 993
1995 porsche 993
1990 porsche C2 911
1966 porsche 911
1984 Porsche 911
2003 Porsche 996
