So I started out by gutting it of every part it had, resetting everything else I had done to it, even going as far as resetting the values to what parts I bought, leaving only the paint and wheels untouched, and I started all over again. From there, I proceeded to install every upgrade the game had, including hidden parts and even ones that the car didn't normally allow. Which of course included dirt and snow tires, torque-sensing differential, and even a supercharger and ultra-high RPM turbo kit installed
together, and more. With everything installed, I then started tinkering with it.
Sheet A.
So this is the sheet intended for rally racing, which was what I wanted this thing for to start with.
Suspension: The first thing I think I did was set the ride height exactly as I had before. While there is probably a better ride height to use, I really wanted to keep this car's appearance
exactly as it was, so I restored the old value. I think I did some other tweaks to the suspension, but I can't seem to remember what they were anymore.
LSD: I wanted to be able to adjust both the front and rear wheels on the LSD, so I swapped the F40's LSD with one from an Escudo, so I could do this from within the game. The front wheels originally didn't have anything there, so I added something so both the front and the rear would have something.
Torque Sensing Center Differential: I believe I set it to 50 and 50 because I wanted this thing to be 4WD, but it ultimately seemed to accelerate in the rear wheels more, so that didn't happen. Still, it got quite a punch in acceleration from it, so I was happy with what I chose. The only problem was that this thing kept popping some big wheelies on asphalt, namely the asphalt section of Tahiti Maze, and I almost did away with this part entirely. However, I was too impressed with its performance on dirt to do so, and although it took me a while, I eventually found a solution to it. Which brings me to this...
Weight Adjustment: Since the front end of this car kept getting airborne, I had to set ballast all the way to the max and move to the very front to prevent this, and it made a
tremendous difference. Unexpectedly, it also became more stable on dirt than it was before and was powersliding a lot better, too, so it was a win-win!
Transmission: I kept the stock transmission this time around and set nearly all the gear ratios to a low setting so it would have quick acceleration, which was needed since it was meant for rally racing. However, with the 5th gear, I did it differently because I wanted the top speed to be at an appropriate value for this tune sheet. So I took it to Chamonix, which has a long straight going downhill that makes it the fastest of any rally track in the game, and observed how fast it went\. Then I set the 5th gear until it topped out at that speed. High top speed is really not necessary on a rally build, so I just set it to the highest speed necessary.
Other stuff: While everything I just mentioned was working pretty well, I found this car was a bit too slow coming out of the corners, so I adjusted the grip multiplier, and that gave me the kick I needed. While it did well at 120, the front end kept getting airborne on the asphalt straight on Tahiti Maze, so it was dialed back to 110, and I found that was suitable. Granted, while it still does get airborne sometimes, it's not nearly as bad, and it's manageable with just a little throttle control.
Sheet B.
So this is the asphalt setting for the car since the rally setting was not suitable for this.
Not as much to talk about here. I copied sheet A here and simply adapted it for asphalt racing. I wanted to keep the lifted suspension, but I found it was way too unstable at high speeds. So I ditched it for this sheet and dropped it as low as the game would allow me, and it handled so much better as a result. Since this thing had more traction than before, I took advantage of this and upped the grip multiplier to 120 since it could handle it now. From there, I think the only other thing I did was adjust the transmission, and that was it.
Sheet C.
Not much to see here, this is just the old setup I had for it before I gave it this much-needed overhaul. I decided to keep it around since it was my first hybrid, and this was how it started out. Though I should note, it did not have weight reduction originally, but it has it here because it's applied to all tune sheets once installed. Unfortunately, given how GT5 works, you can't remove it from one sheet and have it on the rest; it will simply come right back. I'm thinking about overwriting this setting someday for something more akin to oval racing since this old setup really isn't that great.
Been an even longer time since I've posted any hybrids here as well and I think it's time I finally change that! 
