Bonneville - WLSR course

[Tyler]

This is the 7-mile high speed course at Bonneville.... one to really test your top speed.

Splits are set at mile 1 (e.g. standing-start mile time) and mile 6. The world speed record is set based on the time taken to get from mile 6 to to the finish line, the "flying mile". You can easily determine your speed over this segment by dividing 3600 by your sector 3 time. E.g. 15.0 seconds = 3600/15 = 240mph.

[Absurdist]

Ohhh that is very cool

[Tyler]

It's fun for a lark, and good for top speed testing. I've run cars on it in the upper 360s, which seems to be the limit, at least without hacking gear ratios...I'm running out of gear, not out of motor.

[Junny]

So simple, yet fun. Going to lower the stroke in my engine to try for some more revs as its hitting max about 3/4 way so far.


8.5 1/4 mile from a 2.4 ton car.... scary

[Reaper392]

I let my fastest car loose on the salt flats after taking all the cooling off and altering the gearbox a bit (sacrificing low speed acceleration for high speed acceleration)

The end result is a 402mph flying mile, or 647kmh. It was still accelerating quite well even in the flying mile, with the speedo indicating ~410mph at the finish line



*edit*
with enough cooling to give me a positive MTBF I get 9.81s, which is 367mph and the limiter for this car with the chosen engine. I could probably improve that a bit by reducing the stroke and increasing the rev limiter though

*2nd edit*
I've just done a bit of googling, and the world record for the classes we are interested in* is 439.562 over the flying mile, so to beat that you would need a flying mile of 8.18s

*Category A;
Group 1 (piston engine with turbo);
Class 10 (5000-8000cc) and class 11(8000cc+)

[RobtheFiend]

Any direct link to the different group/classes? Is there different classes for pushrod engines versus sohc/dohc?

[Reaper392]

Any direct link to the different group/classes? Is there different classes for pushrod engines versus sohc/dohc?

When I was talking about classes I meant the FIA land speed record vehicle classes, simply so we could work out which of the many land speed records are relevant to automation . All of the classes are listed on page 8 and 9 of this document: http://www.fia.com/sites/default/files/ ... 202014.pdf

When they say supercharged and non supercharged, they mean forced induction vs naturally aspirated. This, and the capacity of the engine, is all that separates the FIA classes for the land speed record of petrol engines (so they probably aren't very good as classes for automation, but that discussion is for another thread).

[Tyler]

The big limitation is that we can't use the super aerodynamic/tiny frontal area bodies. A typical LSR car looks something like this:



On the upside, we do have much better traction than they actually get on the salt, which is actually pretty slippery.

As an aside, many of those cars use total loss/boil off cooling systems so running with 0 cooling is not unrealistic.

[stm316]

I'm no match for the experts, but I did manage this...
Using the Bonneville course from the website.... and six cans of Jack
EDIT... Modified LUA file to single seater to reduce weight... (does that count?)
EDIT 2... it'll take 2.6KM to come to a stop

[group]

When they say supercharged and non supercharged, they mean forced induction vs naturally aspirated. This, and the capacity of the engine, is all that separates the FIA classes for the land speed record of petrol engines (so they probably aren't very good as classes for automation, but that discussion is for another thread).???

[WC1300]

Tyler, this is what I call a high speed vehicle (that guy has set enough records with this bike to write a shopping list)