 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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#1
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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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| pvollma |
Apr 28 2014, 07:34 AM
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#2
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Member Group: Members Posts: 205 Joined: 12-May 13 From: Camp Hill, PA Member No.: 15,862 Region Association: MidAtlantic Region
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QUOTE(jim_hoyland @ Apr 26 2014, 07:59 PM)  What's the speed of a typical 914 in 5th gear at 3,000 rpm ? My speedo have been under reporting for a while. I've attached the chart I created for my 914 with 195/65-15 tires. 
914PerformanceChart.txt ( 1.88k )
Number of downloads: 93Let me know the complete size of your tires (width/section-diameter) and I'll run one for you. |
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| jim_hoyland |
Apr 28 2014, 06:19 PM
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#3
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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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QUOTE(pvollma @ Apr 28 2014, 06:34 AM) QUOTE(jim_hoyland @ Apr 26 2014, 07:59 PM) What's the speed of a typical 914 in 5th gear at 3,000 rpm ? My speedo have been under reporting for a while. I've attached the chart I created for my 914 with 195/65-15 tires.
914PerformanceChart.txt ( 1.88k )
Number of downloads: 93Let me know the complete size of your tires (width/section-diameter) and I'll run one for you. Fantastic ! (IMG:style_emoticons/default/smile.gif) I began the same today using my iPad. Our figures for 5th gear above and below 3,000 rpm are very close. Mine would round up to the next whole number. At speeds below 45, my speedo and iPad app were in agreement . My speedo reads 5-10 mph after 65 mph; can a speedo be re calibrated when the accuracy is mostly in the higher speeds ? |
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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 Elliot Cannon It doesn't matter what size tire you use or wh... Apr 28 2014, 10:56 AM 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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