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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-07-2009, 02:02 AM   #1
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Data Logging program: need specifications

So first off, it is a data logging program that came with my usb CEL scanner. Its called Speedtracer and the CEL scanner is called scantool by Autoenginuity.

The car is question is a '96 ng900 SE(t) 5 speed with 5 doors. Here's what I need:

Curb Weight: 3140 lbs (dry? wet?)
Gear Ratio: (has a calculate button that uses the mph vs rpm)
Drag Coefficient: .320 cw
Frontal Area: sq. feet

Working gear: :1 (not sure what theyre asking here)
Rear end ratio: :1

Thanks!
Attached Images
File Type: jpg speedtracer.JPG (64.3 KB, 22 views)
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Old 11-07-2009, 12:29 PM   #2
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Anyone?

I finally found the drag coeff of a '95 900 turbo: .320

It was a wiki thats linked to this site:http://www.mayfco.com/tbls.htm

I need to know that I am reading this right though: http://www.mayfco.com/saab.htm. For the '95 900 turbo, the frontal area is Area (ft2 ) or 22.20. And what the hell is Cd x ft^2?
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Old 11-07-2009, 04:51 PM   #3
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Table

Looks like that table does the math for you- 22.2 sq.ft. ( frontal area)) times .32 , which is the drag coefficient, = 7.10. That number must be used together with the gear ratios and horsepower to figure the top speed of the vehicle. There usually is a point at which you run out of horsepower when you're trying to push all the air out of the way before you run out of RPM's. My stock (but very healthy) automatic '97 900SET went to 135 MPH, but I've been told there is a little bit more to be had. That was the speedo reading, but a lot of times they are higher than the actual speed. The working gear is the transmission ratio in top gear. The differential is 3.82:1, I think.
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Old 11-09-2009, 12:53 PM   #4
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Quote:
Originally Posted by bobg450 View Post
The working gear is the transmission ratio in top gear. The differential is 3.82:1, I think.
Where can I confirm that number?
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Old 11-09-2009, 02:23 PM   #5
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Out of curiosity: is this for a street tune or a track racer?
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Old 11-11-2009, 01:37 AM   #6
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This is in a street car. its not a tuning program, merely a data logger. I got it for free with the purchase of a OBDII reader for a laptop.
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