proper upshift technique
Rennlist Member
Joined: Jul 2009
Posts: 5,970
Likes: 114
From: Vancouver, BC
In 997, redline for sure!
Now, in my old S4, with a chipped engine, there was an argument to short shift to fall under the sweet spot of Torque, most because the chipped engine had a HUGE Torque spike in mid-range that fell off dramatically over 5500 RPM, and my Dyno also showed Max HP was not at redline, but around 5500... so just to ensure you have the most HP you'd short shift to go BACK to the sweet spot in the next gear. Not the case in our engine.
Now, in my old S4, with a chipped engine, there was an argument to short shift to fall under the sweet spot of Torque, most because the chipped engine had a HUGE Torque spike in mid-range that fell off dramatically over 5500 RPM, and my Dyno also showed Max HP was not at redline, but around 5500... so just to ensure you have the most HP you'd short shift to go BACK to the sweet spot in the next gear. Not the case in our engine.
Pro
Joined: May 2009
Posts: 659
Likes: 15
From: San Francisco, CA
I have driven a VW TDI in Germany for several years. I often drove at high speeds ( up to 125 mph) and I can tell you that shifting at redline does not produce the fastest acceleration. After about 3500 to 4000 rpm the engine just makes more noise.... not more power. The best power came from 1800 to 3500rpm.
Three Wheelin'
Joined: Jul 2007
Posts: 1,649
Likes: 96
From: NJ
With a 911 I do believe that maximum acceleration is achieved by shifting close to the redline. But, with many gasoline engines, max acceleration is achieved by shifting well ahead of the redline. As said earlier......it depends.
Addict
Rennlist Member
Rennlist Member
Joined: Jul 2004
Posts: 16,015
Likes: 815
From: Temecula, CA
My Speed3 needs to be shifted well below redline to maximize acceleration. Power drops off dramatically anywhere near redline, almost as if the Turbo shuts down.
The 928 accelerated best when shifted at redline. At 4500 RPM the car really came alive and the engine continued to pull hard to redline.
So the answer is really dependent on the car.
The 928 accelerated best when shifted at redline. At 4500 RPM the car really came alive and the engine continued to pull hard to redline.
So the answer is really dependent on the car.
