I conducted a test on this.
I first purchased a new S7 straight from the dealer, got a fully customisable transmission (but didn't fit it) then got an oil change. I took it straight to the test course and went out to find out the top speeds in each gear. For the standard car:
Code:
Gear Top Speed (mph)
1st 73
2nd 87
3rd 124
4th 156
5th 193
I couldn't be bothered waiting to get to top speed in 6th gear.
I switched the transmission to automatic, left the driver aids at the default settings and did a 0-400m run. The popular thinking on getting reliable results from this type of acceleration test is just to mash the accelerator as hard as possible without trying to feather the throttle to get a better launch. This eliminates the human variable from the equation (arguably the largest variable) and should keep the starts fair across all transmissions/gear ratios. I did three runs and they were all within 1 hundredth of a second of each other. The quickest was an 11.725 second run, with a terminal speed of 131mph.
Next, I went back to the settings and installed the fully customisable transmission. I went back out with a manual transmission to record the in gear top speeds again:
Code:
Gear Top Speed (mph)
1st 51
2nd 80
3rd 115
4th 155
5th 199
The default gear ratios for the fully customisable transmission are:
Code:
Gear Gear Ratio
1st 3.487
2nd 2.239
3rd 1.589
4th 1.187
5th 0.933
6th 0.771
Final 3.220
Next, I switched back to automatic and did a 400m run with the same procedure as before, and with the driver aids still engaged. 3 runs again, all within one hundredth of a second of each other. The fastest was 12.122 seconds, with a terminal speed of 130mph.
Then I went to find the real-world gear ratios of a standard Saleen S7. I found
this page, which lists the gear ratios as follows:
Code:
1st 2.460
2nd 2.060
3rd 1.470
4th 1.180
5th 0.958
6th 0.740
Final 3.220
I attempted to match these ratios in the setup screen. However, the first gear ratio was only adjustable from 3.071 to 3.922, as you can see below.
So, I settled for the lowest possible gear setting (i.e. 3.071). The rest of the ratios were successfully matched to those found on the page provided above.
I went back out with the new ratios to record in-gear top speeds again:
Code:
Gear Top Speed (mph)
1st 59
2nd 87
3rd 124
4th 156
5th 193
All tested gears above first exactly matched the top speed possible in the standard car, so I think it's safe to assume PD modelled the gear ratios (from 2nd to 5th at least) from the same data. I tested this setup from the same procedure above and again got three runs within one hundredth of a second of each other. The fastest was a 12.010, with a terminal speed of 130mph.
In addition to the above, I recorded video of each of the quickest runs. From analysing the video, the gearchange time of the standard car appears to be roughly 0.35 seconds. The gearchange time of the car equipped with the fully customisable transmission was 0.68 seconds. These times were measured as the time taken from the last frame of video containing an increase of vehicle speed to the next frame containing an increase in vehicle speed during a gearchange. This is perhaps not the ideal way to measure gearchange time, but in the absence of another way, I believe it's the best way. Also, since I used the same method to measure gearchanges for each car, they should be consistently accurate.
So, in conclusion, the gearchange time of the Saleen S7 equipped with a fully customised transmission appears to be almost exactly double that of the standard car. In addition, the standard car is roughly 4 tenths of a second slower through the 400m acceleration test.
Here is a link to a side-by-side video comparison of the acceleration tests from this comparison. On the left is the standard car, in the middle is the car equipped with the fully customisable transmission at the default ratios and on the right is the car equipped with the fully customisable transmission with settings changed to match (as closely as the game allows) the real world gear ratios of a Saleen S7.
edit: Added terminal speeds for 400m runs.
