 Speed vs RPM, How fast should I be going ? |
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| jim_hoyland |
 Apr 26 2014, 05:59 PM
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Get that VIN ?  Group: Members Posts: 9,467 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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What's the speed of a typical 914 in 5th gear at 3,000 rpm ? My speedo have been under reporting for a while.
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| Elliot Cannon |
Apr 28 2014, 10:56 AM
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#2
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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It doesn't matter what size tire you use or what size wheel you have them mounted on. When it comes to speedo accuracy, it is based on the outer diameter of the tire mounted on the wheel and inflated. I have always had 17" wheels on both my 914's but I chose a tire that gave an overall diameter of just over 25 inches. I found a chart on the Tire Rack web site that gives combinations of wheels and tires and what their overall diameter is. It helped me a lot when deciding on what tires to order when I went to a five lug on my car.
Cheers, Elliot |
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Posts in this topic
jim_hoyland Speed vs RPM Apr 26 2014, 05:59 PM
914itis I would say 60-65 mph
My speedo is also 10 mph adv... Apr 26 2014, 06:08 PM Tom Jim,
That would depend on your wheel/ tire co... Apr 26 2014, 06:15 PM jim_hoyland I'm running 16" wheels. My iPad speedo ap... Apr 26 2014, 06:34 PM
struckn
I'm running 16" wheels. My iPad speedo a... Apr 26 2014, 07:01 PM jim_hoyland
I'm running 16" wheels. My iPad speedo ... Apr 26 2014, 07:06 PM mepstein
[quote name='struckn' post='2029815' date='Apr 26... Apr 26 2014, 07:27 PM Hine62 My speedometer is also off because of tire size. I... Apr 27 2014, 05:53 AM toadman If the tires and transmission on your car are comp... Apr 27 2014, 08:11 AM jim_hoyland Just checked my manual. Says 3,000 rpm in 5th = 70... Apr 27 2014, 11:11 AM r_towle 165r15 are 25.4" in, diameter
205 60 r 16 are... Apr 27 2014, 11:47 AM jim_hoyland Does the car go faster with smaller tires, given t... Apr 27 2014, 04:01 PM r_towle
Does the car go faster with smaller tires, given ... Apr 27 2014, 04:11 PM Big Len No, you would be going slower.
Try this - http://... Apr 27 2014, 04:07 PM pvollma
What's the speed of a typical 914 in 5th gear... Apr 28 2014, 07:34 AM jim_hoyland
[quote name='jim_hoyland' post='2029780' date='Ap... Apr 28 2014, 06:19 PM ndfrigi Drove my 75 1.8 F.I. last weekend with 185x65x15 t... Apr 28 2014, 11:05 PM dlkawashima
Drove my 75 1.8 F.I. last weekend with 185x65x15 ... Apr 28 2014, 11:53 PM ndfrigi
Drove my 75 1.8 F.I. last weekend with 185x65x15... Apr 28 2014, 11:56 PM |
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