Tunning transmision

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bostwick_965

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Alright I have a decent grasp on transmission tuning, but I have one question is it better to have the transmission tune for the greatest acceleration in the longest straight of you given course or to have the transmission tuned to reach the top speed of the longest straight and be tuned to give the greatest acceleration for the courses average speed range. An example the longest straight allows your car to reach 180MPH and the average track speed is 110Mph should you tune it to have the best Straight acceleration or have the cars transmission tuned to reach 180MPH and have the greatest acceleration close to the average speed sacrificing straight time.
 
I usually set the transmission so that the car nearly redlines at the end of the longest straight, this gives maximum acceleration in the cornering sections as they form the majority of the course. Losing one second on the straight is a small thing if you can take two seconds back in the corners thanks to shorter gears.

Naturally this depends on the course, if it has few corners and lots of long straights you should go for the straight acceleration. Just try the different choices out, you'll find the best for sure. 👍

- R -
 
So you tune your car to reach redline at the highest gear in the longest straight and so that a malority of the earlier gears are set up around the redline in most corners.
 
bostwick_965
So you tune your car to reach redline at the highest gear in the longest straight and so that a malority of the earlier gears are set up around the redline in most corners.
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You don't alway get the best results by simply aiming for the red line in the highest gear. In particular cars with six speed transmissions may actually benefit from reaching the end of the main straight in fifth rather than sixth.

When I tuned the BMW M3 at Grand Valley for the tuning guides I found using sixth gear did not give a major advantage in top speed (a few mph at best), but did result in a lower overall lap time due to the increased number of gear changes around the track.

In that particular case fifth was the highest gear needed.

Regards

Scaff
 
that sound reasonable scaff and thanks for the reply but do you tune your car for acceleration in the longest straight or for acceleration the most common corners and or specific corner or for the greatest accelleration around the track analyzers average speed. please anyone reply and tell me why you do tune it that way or why not thanks.
 
If you want to try to have the best of both worlds I have come up with a good general strategy that has worked spectacular in reducing my lap times. Instead of just tinkering with the overall gear ratio what you need to do is set the individual gears up right.

The current set up that I have been experimenting with is to raise my overall gear ratio to almost redline at the end of the longest straight using the automatic gear ratio selector. You don't want the car to be at the top of the revs, because almost no engine makes its max power rating at redline. Then you will have to go into the individual gears.

Adjust 6th gear as short as it can go, as well as 5th gear. Then adjust 1st and 2nd gear as long as they can go. Observe the graph and adjust 4th just before the middle of 3rd and 5th gear. DO NOT touch 3rd gear.

The reasoning for this setup is that there really are no first gear corners in Gran Turismo (there are some, yes). Then I raised second gear because most of time that is your lowest driving gear. Raising second gear all the way DOES NOT make it to long, instead I use it as a way to control tire spin coming out of second gear corners ( I don't drive with electronic nanies on ). This increases acceleration and lowers your lap times. Now the rest of the gears will be shorter and always in the engines powerband no matter what corner your in, while still maintaining the top speed that you need and improving your acceleration too.

TRY IT!

( This is of course a generalization. After I do those steps somtimes I make MINOR adjustments to the gears or final drive. )
 

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