 Speed vs RPM, How fast should I be going ? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| jim_hoyland |
 Apr 26 2014, 05:59 PM
Post
#1
|
|
Get that VIN ?  Group: Members Posts: 9,467 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
 |
What's the speed of a typical 914 in 5th gear at 3,000 rpm ? My speedo have been under reporting for a while.
|
   |
 
|
  |
Replies
| ndfrigi |
Apr 28 2014, 11:05 PM
Post
#2
|
|
Advanced Member Group: Members Posts: 2,956 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California
|
Drove my 75 1.8 F.I. last weekend with 185x65x15 tire size and it shows 70 mph at 3,000 rpm. But my phone apps speed show 66 mph. I believe the difference of 4 mph is from the current tire size which is not the factory size. Well hoping when I got my new tire 195x60x15 or 205x55x15 will have more accurate speed.
  |
 |
|
| dlkawashima |
Apr 28 2014, 11:53 PM
Post
#3
|
|
914 Guru Group: Members Posts: 9,749 Joined: 1-October 10 From: San Jose Member No.: 12,234 Region Association: Northern California |
QUOTE(ndfrigi @ Apr 28 2014, 10:05 PM)  Drove my 75 1.8 F.I. last weekend with 185x65x15 tire size and it shows 70 mph at 3,000 rpm. But my phone apps speed show 66 mph. I believe the difference of 4 mph is from the current tire size which is not the factory size. Well hoping when I got my new tire 195x60x15 or 205x55x15 will have more accurate speed. You really need to use the tire size calculator because you're setting yourself up for disappointment. Use 165/80-15 (or 165/82-15) as the original size tire and input the three tire sizes above to see the differences. http://www.tacomaworld.com/forum/tirecalc.php |
|
|
|
| ndfrigi |
Apr 28 2014, 11:56 PM
Post
#4
|
|
Advanced Member Group: Members Posts: 2,956 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California
|
QUOTE(dlkawashima @ Apr 28 2014, 10:53 PM) QUOTE(ndfrigi @ Apr 28 2014, 10:05 PM) Drove my 75 1.8 F.I. last weekend with 185x65x15 tire size and it shows 70 mph at 3,000 rpm. But my phone apps speed show 66 mph. I believe the difference of 4 mph is from the current tire size which is not the factory size. Well hoping when I got my new tire 195x60x15 or 205x55x15 will have more accurate speed. You really need to use the tire size calculator because you're setting yourself up for disappointment. Use 165/80-15 (or 165/82-15) as the original size tire and input the three tire sizes above to see the differences. http://www.tacomaworld.com/forum/tirecalc.php Yes sir I already did use that tire size calculator and thanks again! |
|
|
|
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 Elliot Cannon It doesn't matter what size tire you use or wh... Apr 28 2014, 10:56 AM |
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 31st October 2024 - 08:20 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.