Best time to up shift gear is at redline RPM or by listening engine sound

Tiny
ALILION12
  • MEMBER
  • 2003 PORSCHE GT3
  • 3.6L
  • 6 CYL
  • RWD
  • MANUAL
  • 50,000 MILES
Hi sir, I want to know that what is the best time to up shift gears I mean gt3 develop 381 horsepower at 7400 rpm and maximum torque at 5000 rpm. So what is the best time to up shift gear and the maximum rpm limit red line is 8200 rpm? So can you tell me please that where is best time to up shift gear? What does red line rpm means rev limiter? And second method to shift gear is by listening sounds of the engine when it is getting engine sound heavier? Waiting for reply. Thanks indeed.
Saturday, January 21st, 2017 AT 9:25 AM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 34,331 POSTS
What are you trying to accomplish? Best fuel economy? Fastest acceleration? Quickest way to destroy the engine? Most comfortable ride?

Red line is the maximum highest speed at which the engineers think the engine will not fly apart. It is intended to be reached very rarely, if ever. For normal driving, up-shift at the lowest engine speed possible when the engine doesn't lug or struggle in the next higher gear.

The engine will usually be listed as having the highest power near red line, but that has little to do with maximum acceleration. "Torque" is what pertains to acceleration, and that is lowest near red line. Think of pedaling a ten-speed bicycle. In first gear your feet will be moving at lightning speed, but you will not be going very fast. You can pedal up a steep hill, but if your legs were twice as strong, you will not get there any faster.

For comfort, some people up-shift too soon. The drop in torque is felt in the seat. If you up-shift at around 2,500 to 3,000 rpm, the feel from one gear to the next will be smooth and less tiring.
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Saturday, January 21st, 2017 AT 12:35 PM
Tiny
ALILION12
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  • 19 POSTS
Sir I can give you but the trouble is I live in uk
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Monday, January 23rd, 2017 AT 10:02 AM
Tiny
ALILION12
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  • 19 POSTS
I found this website very helpful for car questions thank everyone who contribute in it
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Monday, January 23rd, 2017 AT 10:03 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Thank you for that comment we have a group of great guys here and CARADIODOC is one of our best.

Thanks for using 2CarPros we are to help, tell a friend.

Best, Ken
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Friday, January 27th, 2017 AT 1:35 AM

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