#f1: exploiting loophole since the beginning of time

[dear-ao3]

bucket of facts here. This is one of my favorite f1 things ever, apologies for how long it ended up being:

In the 1980’s, formula one teams, notably BMW, added toluene to their fuel mixtures. If that word sounds like it’s probably dangerous, that’s because it is — most people know it as rocket fuel. It’s extremely poisonous and carcinogenic, but did have some upsides! For one, it was less volatile [citation needed] than what they had been using, making is slightly less dangerous in the event of a crash (by 1970’s-80’s F1 standards that just means in only turned into a small bomb most of the time). It was also denser and burned faster, so the same amount of toluene could give much more power than the standard F1 fuel.

While the new fuel did allow them to run higher turbo pressures, it did it have a tendency to increase turbo pressure as it was run during the race, and everyone ran turbos at this time. They had to dial back the turbo pressure from what it’s max could’ve been, just to compensate for the power of the fuel — this mitigated the admittedly high likelihood that the engine decided to submit its two weeks notice on two seconds of warning (read: it caught on fire and sometimes kinda maybe sorta just exploded).

Modern f1 fuel has an RON octane rating of 95-102. The toluene aided fuel had an RON octane rating of 120+. For context, your car probably runs on about 87 RON. For those unfamiliar, RON octane ratings measure how much compression fuel can be put under before it sparks, which is how engines work: compress fuel, spark, make power (I can explain that better if you want but short version is that). This incredibly high octane level allowed the engines of the time to be run at a much higher compression, which had a myriad of bonuses to the cars.

Current F1 regulations are 1.6 litre V6 engines that rev to 15,000 RPMs (max allowed) and produce a max of 850 BHP (horsepower) when they’re pushing the edge of their abilities without aid of electric components like H/KERS, which is used to boost the cars to around 1,000 BHP.

Brabham-BMW’s 1983 engine took Nelson Pique to his WDC that year. It was a 1.5 litre inline 4 (so smaller than current) and produced 12,000 RPMs, as the restrictions were a bit tighter there back then. Without electronic aid like today and a smaller engine than your standard Toyota Camry, it easily produced 850 BHP at race trim, the version built to last a whole race. When in qualifying trim, with everything tuned to maximum to get the most out of the car without it blowing up, it ran at 1,250 BHP. Original testing put it at producing over 1,400 BHP, but BMWs testing facilities couldn’t measure past that — the car put out more power than they could even register.

The teams also had a sneaky loophole: the amount of fuel allowed to be held at once in the car (refueling was banned at this time) was effectively limited to how large the gas tank could be. The teams realized that they could literally freeze the fuel and store it at cold temperatures. This compacted the fuel, allowing them to put more fuel into the gas tank — more fuel per fuel, really. This allowed drivers to be more aggressive and push harder more often, not having to worry about running out of fuel.

In case this whole toluene thing seems bad, don’t worry! It’s only used in nail polish, rubber, adhesives, and paints :3

hit me up for more facts if you want

oh my

anon bestie i might in fact be in love with you