Thank you for downloading the F1SR F1-1991 mod Historic Edition for rFactor. This document will help you understand our physics models, and give you some hints for how to set up the cars. The Historic Edition physics models have been in development on and off for over two years. The physics started as an experiment of a few ideas I had to improve a few key aspects of rFactor open-wheel physics in ways that had not been attempted before. Tired of waiting for the ever upcoming F1 1991 mod, I threw together one of my own just to tinker with. Once I joined F1-S-R late last year, they had already taken over the 1991 mod and had some decent graphics and sound put together. Then I refined the physics models over several evolutions, and with hundreds of hours of research and help from our test drivers, we have incorporated it into this full-featured mod. 1991 is one of my favorite F1 seasons, and apart from a few tedious tasks, it has been a joy developing these cars in as much detail as possible. With 18 different teams, there was a fantastic variety of engines and chassis during the season, and an interesting tire war between Goodyear and Pirelli. ![]() The performance of the cars was astounding, and produced, very nearly, the very best road-course performance ever seen in all of motorsport, up to and including present-day. And yet, it was not until just after the 1991 season, that “driver aids” and active suspension really began to take over and change the driver-skill aspect of the sport into something fundamentally different from what it had been all through the 70’s and 80’s. Engine torque curves have been carefully estimated, and our approach was well validated late in development when we got our hands on a real dyno plot for a 1992 Lamborghini F1 engine. The 3.5 liter engines of this era were notably more torquey than the much smaller, and higher revving F1 engines of present-day. Rather than keeping the revs high and riding the rev-limiter exiting corners, you may have to adopt a different driving style than what you may be accustomed to from present-day F1 mods. The manual-transmission cars will tend to reward you more for selecting a higher gear and relying on the out-of-tune range of the torque curve to pull you through the corner. Gear changes will cost you much more time, so they are something to be avoided, unless you are driving the Ferrari or Williams, which have semi-automatic transmissions. With a manual transmission you will also have to blip or breathe the throttle when shifting. We have used the rFactor “boost” control to simulate what is purely a fuel mixture control, a pair of dials (one for each cylinder bank) that would have been on the car’s dashboard. Predictive data mining techniques pdf. This controls how lean or rich the engine runs. At the minimum boost setting the engine will run at optimum fuel economy. At the maximum boost setting, you will have 14% more power, but with 28% more fuel consumption. The boost control will not significantly damage your engine, since it does not change the rev-limit, ignition timing, or anything else besides fuel mixture. Managing fuel mixture was very important during the 1991 season because refueling was not allowed. Suffice it to say, you will not have enough fuel to run full rich in a full-length race at some tracks. The high-revving V-12 engines are particularly thirsty. Senna’s V-12 Honda ran out of fuel twice during the 1991 season. The Yamaha V-12 in the Brabham is the least efficient of all. The rev-limiter is also adjustable via the setup screen.
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