It's a space issue. If you go any lower, the sump becomes the lowest spot on the car. There are two other race only deep sumps, one by Mantis (Canada) and the other by Autofarm (UK) that lower the sump considerably more and have the proper oil pickup extensions, like our kit. None of the other deep sump kits properly lower the pickup.
I normally try to run about half a quart low, so the deep sump in my case puts me back to the factory fill level.
For the novice, a deep sump should be sufficient to help prevent starvation on most tracks/autocrosses. For the experienced driver and on tracks with long sustained turns, like the carousel at Road America, our 0.5qt deep sump might not be enough. Our region autocross chair had engine damage related to oil starvation at TRAK a few weeks back at Road America in his 2.7 boxster (no deep sump, etc)
That's where if it's a dedicated track car, you go with the deeper sumps and/or install an accusump, like we have on our car.
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Charles Navarro
President, LN Engineering and Bilt Racing Service
http://www.LNengineering.com
Home of Nickies, IMS Retrofit, and IMS Solution
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