I'm trying to get more acceleration out of my Audi, I find that I am getting to the Indy 1/4 finish line while sometimes still in 5th gear. Sometimes shifting to 6th at the finish. I'm afraid that if I shorten 5th or finale gear I'll waste more power during launch in wheel spin.
What I want is to get more 4-6 gear acceleration, with my ultimate goal being redline 6th gear at or just after Indy RC 1/4 mile finish.
The car is fully broke in, 910hp.
Any help would be fantastic. I know it will never be a GT-R Black Edition, but I enjoy racing it.
As a matter of fact, it CAN beat black editions. The issue with this car is your goal will make it slower. The power and torque made at reline in said car is actually substantially lower than at the preferred shift point, that of which i believe is 6,600 Rpms. Although I am unsure. I will take a look In a few moments.
This was taken from master shakes sticky thread "transmission tuning for dummy's"
Shiftpoints
Now that you've looked at all of these points of interest, lets draw some conclusions from them all. Both of these cars make peak horsepower at roughly 6800 RPM. The Quattro makes torque later on in the powerband, while the Ford GT makes it sooner. RWD cars commonly make more torque in the lower RPMs, but there are quite a few exceptions to this. Torque and Horsepower intersection is more to do with launch, so we'll cover that later.
In order to determine where you want to shift the car, you want to find the highest average power throughout the peak. Basically, keep the car making as much horsepower as possible the entire 400m run. With good tuning of gears, you can achieve this and obtain good times - possibly high leaderboard positions.
Also when you shift, depending on the setup, the next gear may or may not put you under the maximum power you want to be at. In these next examples, the first red line in the curve represents where the gear will start out after shifting, and the second represents at what RPM to shift into the next gear.
Here are two possible shiftpoints for the Ford GT:
http://i146.photobucket.com/albums/r...rdGTShift1.jpg
http://i146.photobucket.com/albums/r...rdGTShift2.jpg
Shiftpoint #1 is a common shift by most inexperienced racers, shifting at approximately peak horsepower. It's not a bad shift by any means, this car supporting a nice torque curve, and it doesn't lose a lot of power. Shiftpoint #2 is the better option, which keeps the vehicle at maximum power throughout the run. You will also want to set the transmission up to come across the finishline at roughly peak horsepower or slightly after - only tweaking will give you a definitive answer on that.
And here are two possible shiftpoints on the Lemans Quattro:
http://i146.photobucket.com/albums/r...mansShift1.jpg
http://i146.photobucket.com/albums/r...mansShift2.jpg
Shiftpoint #1 is also the beginners choice in shift, shifting at the peak horsepower. However, in this example, the bottom of the shift puts the car into very low horsepower - which is bad. The torque will not replace raw horsepower in this formula, and you will be left struggling for power between shifts. Shiftpoint #2 provides maximum power as well as the peak torque for a short time, which will keep your momentum going until the next shift.
