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914World.com _ 914World Garage _ speed check

Posted by: rhodyguy Jul 11 2003, 02:09 PM

the car wants to go fast. the wife told me to slow down 3 times today. i looked down and was doing 80 and didn't have a clue. the tire size is 195/60 15. what are you doing at 3000 rpm on the freeway? i'm going out for a few of my favorite onramps this afternoon.

kevin
"done and running"

Posted by: mskala Jul 11 2003, 02:20 PM

Dug out the old spreadsheet.

With the 205/55 bridgestone street tires on the -6,
I'm doing 64.0 at 3000rpm. If it was a -4 fifth gear,
it would be 68.4mph.

If I use the calculated diameter for 195/60/15 using
a -4 fifth gear, I get 69.8mph for you.

Posted by: rhodyguy Jul 11 2003, 02:24 PM

thanks loads!!!

kevin

Posted by: DNHunt Jul 11 2003, 02:24 PM

Kevin

2900 in 5th is reads 70 mph for me. But I believe it is about 60 since everyone is passing me. I run the same tire size as you. I usually drive just below 3000 and have only been pulled over once since 1982. Don't believe the speedo or the wife (no offense Jean but in the 914 you're sitting a little low).

I just try to keep up with traffic and that's getting harder to do. Man I sound like an old fart. By the way, the only way to keep up with Geoff is to keep him behind you. Find a narrow road and drive wide or smoke him out like I do. LOL.

Dave

Posted by: rhodyguy Jul 11 2003, 02:35 PM

dave, are you at work, home, in town or what? i'm hot to drive.

kevin

Posted by: DNHunt Jul 11 2003, 02:56 PM

Kevin I'm at work then going to the Mariners with the wife so I'm on the shelf today. Lets try something this weekend. Imagine people seeing two funny little silver cars. "I wonder what those things are"

Dave

Posted by: tryan Jul 11 2003, 03:05 PM

must be fiats.

explain to your wife that our speedometers are optimisticly inclined. hold a steady sixty and use the mile markers for 10 miles or do to see what % you are 'off'. lest she look at the tach.

Posted by: Neal Jul 11 2003, 08:32 PM

195/60 R15, I drive with the speedo just under 90, it just seems right
I think at 3000 mine says about 75. Go figure

Posted by: ChrisReale Jul 11 2003, 08:38 PM

Come up to Seattle, and bring a spare throttle cable

Posted by: Red-Beard Jul 12 2003, 08:11 AM

http://www.sdspeedo.com/frames/sdspeedoerrorpg001.html

Stock tire size is 165 80 15

Input your tire size and your speedometer reading

James

Posted by: anthony Jul 12 2003, 11:05 AM

I'm running 195-60-15s too and my speedo is way off. I think it reads at least 10 to 12 mph fast even though the calculations say it should be 5 mph fast.

Posted by: maf914 Jul 12 2003, 12:10 PM

My 205/60 x 15 size is not off too bad. About 2 mph at 70. I can live with that.

Now I wonder how accurate the speedometer and tachometer are?

Mike

Posted by: redshift Jul 12 2003, 05:32 PM

Hey Mike, my Tach is 200 low @ redline, my speedometer is dead on! 1st time for everything!

I was a lil scared when I discovered the tach drift.. I had already been above that line.

Stock tires (32lbs) at true 3000 I am at 73mph and a teenie..

M