No, you are right, the LSD, chip, exhaust, suspension changes and intake are modifications allowed under the Street Prepared Rules. It's also a major hang-up with the Viggen (lack of a limited slip) with all that power. Since I'm thinking about modifying and pushing the hp up to 300 hp, the power won't do me any good in autocross without a limited slip.

I believe the traction control can help in two ways. First, set agressively at say about 20% slip allowed, you could literally floor it coming out of the corner and have the computer modulate the throttle for you (it's going to be about 100 times quicker than you could do it pumping the throttle). Therefore, it would allow for quicker times. A lot of race cars use this technology. Unfortunately, the stock traction conrtol is set way before the cars threshold, probably so it kicks in the moment any slip is detected. My 2000 Viggen doesn't have traction control. SCCA rules will allow for updating / backdating, therefore I can update mine to 01 specs.
Second is that I see snow. With 300hp and a LSD, both tires will break loose often. In a FWD car, that essentially loses all steering input since those tires no longer have any grip. It is one of the main reasons you don't typically see a LSD in a FWD car from the manufacturer.

hoping this clears things up,

Chris Fisher


posted by 199.174.253...

• Viggen traction control options?, CFishgo, Thu, 5 Dec 2002 13:02:40
  • back to subject: Traction Control questions, CFishgo, Mon, 9 Dec 2002 00:01:15
    • Re: back to subject: Traction Control questions, A.Fegely, Mon, 6 Oct 2003 08:42:45
    • probably the same wheel sensors, dave n, Mon, 9 Dec 2002 17:00:58
  • something doesn't add up, dave n, Sat, 7 Dec 2002 11:33:03
    • Re: something doesn't add up, CFishgo, Sun, 8 Dec 2002 11:46:01 <-- Viewing This Message
      • oh, now I see, dave n, Mon, 9 Dec 2002 16:57:19
        • Re: oh, now I see (long), CFishgo, Mon, 9 Dec 2002 19:46:09
  • Re: Viggen @ autocross, STICKMAN, Fri, 6 Dec 2002 09:17:19
    • Re: Viggen @ autocross, CFishgo, Fri, 6 Dec 2002 09:54:22
      • re: Viggen @ autocross..., Eric van Spelde, Sat, 7 Dec 2002 12:48:58
        • Don't Auto-X your Viggen, plum, Sat, 7 Dec 2002 13:28:25
          • no harm in autocrossing, gorper, Sun, 8 Dec 2002 17:52:27
          • It's not that the Viggen is a 100,000 exotic!!, GM, Sat, 7 Dec 2002 14:55:04
      • however, ..., GM, Fri, 6 Dec 2002 17:59:01
        • Re: however, ..., Will, Fri, 6 Dec 2002 21:34:52
          • Will: Subframe brace in DSP?, CFishgo, Sun, 8 Dec 2002 23:44:10
  • Hey Chris..., Andy E, Thu, 5 Dec 2002 20:44:15
    • Re: Hey Chris..., CFishgo, Fri, 6 Dec 2002 02:11:19
      • I would race but I don't have good tires..., Andy E, Fri, 6 Dec 2002 20:23:16
        • Want to co-drive my Viggen?, CFishgo, Mon, 9 Dec 2002 10:23:25
          • Definately, check your email!! nm, Andy E, Tue, 10 Dec 2002 22:58:13
  • Re: Viggen traction control options?, Philippos, Thu, 5 Dec 2002 19:47:29

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