 TACH/SPEED ? |
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| spare time toys |
 Jul 21 2004, 07:51 PM
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#1
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hooked on grilling food.  Group: Members Posts: 4,059 Joined: 3-April 04 From: West Plano Tx Member No.: 1,884 Region Association: Southwest Region  |
What is the speed for all gears at about 2100 rpm. I dont have a working speedometer and need to know approx mph. I have a stock side shifter I know tire size will change it a little but just need a close number.
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| john rogers |
Jul 21 2004, 08:36 PM
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#2
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
If you check over at the Pelican site and download my "Gears" program it will let you enter the gear ratio for each gear, the final drive ratio and tire size (dia, circumference or # turns per mile) and a slider shows the speed vs RPM for each gear. Does a print out too and it is handy to let you see what changing things will do. There are several spreadsheets around but they figure the tire size is set. You could borrow a GPS unit as mine is VERY accurate. Good luck
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| spare time toys |
Jul 22 2004, 07:46 AM
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#3
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hooked on grilling food. Group: Members Posts: 4,059 Joined: 3-April 04 From: West Plano Tx Member No.: 1,884 Region Association: Southwest Region |
That is good but I am looking to find out about how fast it is going at around 2000 in the gears as that is where the eng. Im looking at runs best. Other wise Ill go another way with this project. Im looking at a TDI powered touring car and that is best mpg/RPM for this eng. in the Jetta. Im getting 54.4 hwy in a boxy VW so I am thinking slant nose 914 should do better. (IMG:style_emoticons/default/driving.gif) and be more fun (IMG:style_emoticons/default/cool.gif)
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| lapuwali |
Jul 22 2004, 08:57 AM
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#4
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
The speed v RPM data from the calculator will tell you how fast the car goes at 2000 rpm crank speed.
The 914 actually isn't all that aerodynamically clean. I'd bet an A4 Jetta has about the same amount of drag. You'll do better on weight, and skinny 165-15 tires will offer less rolling resistance, but don't expect Honda Insight class numbers. |
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| spare time toys |
Jul 22 2004, 10:56 AM
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#5
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hooked on grilling food. Group: Members Posts: 4,059 Joined: 3-April 04 From: West Plano Tx Member No.: 1,884 Region Association: Southwest Region |
Fine and dandy....say your car is in fifth gear and your tach is showing 2000 RPM how fast is it going? That is all I need to know I dont need a calculator or charts just info as to what to expect.
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