[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Top Speed, 9-5 and 9000 Aeros, Viggen Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Thu, 1 Mar 2001 15:20:47 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

In coky's previous thread, LDH posted some C+D speed and gearing data. Decided to predict the 9000 Aero top speed.

The 9-5 and Viggen have the same ratios, and the 9-5 o'all net gearing is only about 2% taller due to the tires. The '96 9000 aero had taller overall ratios due the 3.61 final drive, and has the same tire dia as the 9-5. The 9000 would be about 28.2 mph/1000rpm in 5th, using the dynamic roll radius.

Aerodynamic drag sucks up hp based on the cube of the speed, and other friction sucks it up in direct proportion to speed. I used the C+D data and some physics, and determined the non drag losses.

Both the Viggen and 9-5 calculated limits were 151 mph, with 430 lbs of aero drag, and 80 lbs frictional loss. I assumed 12% drive train loss, which is different from the frictional losses that include wheel bearings, tires, etc. The Viggens larger Cd exactly balances the smaller frontal area, vs the 9-5. Since the C+D data shows the engines are at high enough rpms to hit the max hp at 5500, both cars could hit the speed marks.

The 96 9000 aero is rated at 225 hp at 5500 rpm. The drag calculations suggest that 147 mph would occur at 225 eng hp ... but rpms will only be
5200 rpm, so it's not likely to get to the 147, but more like 140 mph. If 205-45-16 or 205-50-15 tires were used, then the 147 mph top speed will occur around 5500 rpm. The aero drag would be 436 lbs (Cd=.32), and the frictional loss would be 78 lbs.

Stuff is not exact, but should be close.

• Top Speed, 9-5 and 9000 Aeros, Viggen, Kevin K , Thu, 1 Mar 2001 15:20:47 <-- Viewing This Message
  • Re: Top Speed, 9-5 and 9000 Aeros, Viggen, Gary, Fri, 2 Mar 2001 02:22:25
    • I have seen 260 kph speedo so far..., Karl , Fri, 2 Mar 2001 15:30:47
      • Re: I have seen 260 kph speedo so far..., Gary, Fri, 2 Mar 2001 22:35:45
      • 260 kph = 161 mph ........, Kevin K , Fri, 2 Mar 2001 17:36:57
        • Well that would indicate..., Karl , Fri, 2 Mar 2001 18:20:13
          • Oh, by the way..., Karl , Fri, 2 Mar 2001 18:21:52
    • mabe 152 mph..., Kevin K , Fri, 2 Mar 2001 12:43:15
    • a hair over 6000RPM in my '88 ...., steveC in BC, Fri, 2 Mar 2001 05:15:03
  • Re: Top Speed, 9-5 and 9000 Aeros, Viggen, Gary, Fri, 2 Mar 2001 02:16:15
    • Re: Top Speed, 9-5 and 9000 Aeros, Viggen, julian, Fri, 6 Apr 2001 13:36:49
  • Cool data! Didn't realize the 2.3/Aero gearing was so different., Aaron Gilbert, Thu, 1 Mar 2001 15:29:19

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• Prev by Date: what about on a C900? whats the widest rim that will fit?, Jordan, Thu, 1 Mar 2001 15:19:46
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