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Old 21 Aug 2009, 17:53 (Ref:2525677)   #1
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ACO Publish 2010 Le Mans Regulations

I beleive they deserve a thread of their own:
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From AUTOSPORT.com
Le Mans organiser the ACO has released the technical regulations for the 2010 Le Mans 24 Hours and Le Mans Series.
The governing body's efforts to equalise the performance of the diesel and petrol-powered LMP1 class continues with the diesels pegged further back and the petrol cars granted a slight power increase.
The rules regarding the bodywork of prototypes have also been tweaked, although the final regulations on front bodywork - which was the area of dispute between Audi and Peugeot at this year's Le Mans - is still to be finalised.
Vincent Beaumesnil, ACO sports manager, said: "Our role is to define a fair set of regulations to give each configuration the opportunity to race. In an unfavorable economic context, the idea was to modify the cars as little as possible. All entrants want to be able to use their current cars in 2010, and possibly in 2011 and beyond.
"It was necessary to make a few clarifications, and to modify certain points in the regulations, to prevent some entrants from investing in solutions that we consider too extreme, and which go against the aims we have set ourselves - to keep laptimes above 3m30s at Le Mans."
The changes to the rules follow a meeting with between the ACO and the manufacturers at Le Mans in June to analyse data from this year's race.
"Regulations must evolve from one year to the next to adapt to the context," added Beaumesnil. "When you publish them, entrants interpret them, work on them, find solutions and performance increases just at the moment when we have to prevent performance escalation to guarantee a level playing field and safety."
A summary of the ACO's regulation changes
1- LMP1 and LMP2 bodywork:
At the rear:
Closing of the part behind the rear wheels. The use of grills or fairings to cover the rear wheel above the axis of the axle will no longer be allowed. The bodywork must be closed in this area and must carry the rear lights, rear stop lights and indicators.
On the sides:
Bodywork located at the rear of the axis of the rear wheels and above the reference plate must form a smooth, continuous, unbroken surface of convex form only, without cuts. It must not be set back more than 100mm in relation to the width of the bodywork at the axis of the rear axle (measured horizontally).
At the front:
Confirmation within 15 days of the aerodynamic definition of the front of the cars. It is currently under study and consultation with the manufacturers taking into account the technical feasibility and cost issues.
2- LMP1 engines
Diesel restrictor reduced from 37.9mm to 37.5mm
Restrictor advantage for closed cars reduced from 0.4mm to 0.3mm
Supercharger pressure reduced from 2750 to 2590 mbar
Petrol restrictor increased from 32.5mm to 33.3mm
GT1 engine (Aston Martin) restrictor increased from 32.7mm to 33.3mm
Use of engines in the Le Mans Series:
At present the regulations oblige entrants to use the same engine for two consecutive In 2010, three sealed engines can be used freely during the season.
Weight of the cars:
The minimum weight of the LMP1 diesel cars is increased to 930kg (30kg of ballast cancelled). The minimum weight of the other categories remains unchanged.
Thoughts then?

General slowing down of the cars, and simpler boydwork around the rear.
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Old 21 Aug 2009, 17:54 (Ref:2525679)   #2
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Full tech regs here:

http://www.lemans-series.com/ml/imag...lemans2010.pdf

My intial thought is that this is going to mean a complete re-design of the R15 rear end, right?
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Old 21 Aug 2009, 20:52 (Ref:2525742)   #3
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Originally Posted by Gingers4Justice View Post
Full tech regs here:

http://www.lemans-series.com/ml/imag...lemans2010.pdf

My intial thought is that this is going to mean a complete re-design of the R15 rear end, right?
I would think so, including the tail lights.
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Old 21 Aug 2009, 21:52 (Ref:2525761)   #4
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I would think so, including the tail lights.
But, given that the airflow is directed through the car, it will require a whole new bodywork design given that there is nowhere for the airflow to exit legally?
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Old 21 Aug 2009, 23:50 (Ref:2525801)   #5
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Disappointed about the tail light ruling - the R15 LED approach looked good, was an elegant solution to them not getting knocked out in a minor rear end shunt, and were a link to Audi brand values with the LEDs.

I'm not going to kick up a fuss until there's been a degree of thinking about it, but there's always a bit of a sigh when something which seemed sensibly innovative gets banned.
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Old 22 Aug 2009, 00:47 (Ref:2525823)   #6
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The bias towards diesel cars has not been addressed. Just makes the regs a joke.
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Old 22 Aug 2009, 01:37 (Ref:2525835)   #7
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Originally Posted by Gingers4Justice View Post
But, given that the airflow is directed through the car, it will require a whole new bodywork design given that there is nowhere for the airflow to exit legally?
Can exit below wheel center line as I understand. The new reg simply states you must now cover all openings above wheel center line. But it's still free below.
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Old 22 Aug 2009, 01:42 (Ref:2525836)   #8
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Originally Posted by TWRv12 View Post
The bias towards diesel cars has not been addressed. Just makes the regs a joke.

That statement is patently untrue! Wether or not it is enough is yet to be determined.





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Old 22 Aug 2009, 02:53 (Ref:2525847)   #9
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Can exit below wheel center line as I understand. The new reg simply states you must now cover all openings above wheel center line. But it's still free below.
Well, I don't know. This is very interesting as it does open up what they can do, doesn't it? I don't understand what they are trying to achieve, other than to reduce downsforce. I'm thinking that teams will interpret this many different ways.

Any other opinions out there?
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Old 22 Aug 2009, 03:39 (Ref:2525859)   #10
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Originally Posted by MulsanneMike View Post
Can exit below wheel center line as I understand. The new reg simply states you must now cover all openings above wheel center line. But it's still free below.
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Originally Posted by pdxracefan View Post
Well, I don't know. This is very interesting as it does open up what they can do, doesn't it? I don't understand what they are trying to achieve, other than to reduce downsforce. I'm thinking that teams will interpret this many different ways.

Any other opinions out there?
No, actually it reduces what they can do. It makes them close off all the screened vents above the wheel center line.



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Old 22 Aug 2009, 03:52 (Ref:2525861)   #11
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Originally Posted by HORNDAWG View Post
No, actually it reduces what they can do. It makes them close off all the screened vents above the wheel center line.



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Oops. My apologies-bad choice of syntax. By opening up stuff, I meant their possiblities, not parts of the body. It will definitely close up the rear of the car; but to what extent and what will it do to the car's aero? The car will look alot different as well. What about the 908?
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Old 22 Aug 2009, 04:04 (Ref:2525864)   #12
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The rule about the rear wheel centerline vents is kinda dumb, since almost every car is in violation of it if they were to be raced next year. It's not just the R15-the Acura ARX-02 is in violation, the Peugeot 908 is in violation, the various Lola and Oreca/Courage cars are, and even the Audi R8 and Bentley Speed 8(including those examples to show that this isn't a new issue at all!) are!. Everyone will have to modify the rear of their cars for next year if the ACO follows through with it-it's just a matter of degree.

And the LMP1 diesel rules of 930kgs minimum weight-does that change anything, since they had that min weight since the Spa LMS round?
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Old 22 Aug 2009, 04:58 (Ref:2525887)   #13
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The weight isn't the thing; it's the larger restrictor for petrol and GT1 engines and the smaller restrictor for diesels.
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Old 22 Aug 2009, 05:05 (Ref:2525890)   #14
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The weight isn't the thing; it's the larger restrictor for petrol and GT1 engines and the smaller restrictor for diesels.
And less boost for the diesels.





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Old 22 Aug 2009, 07:05 (Ref:2525908)   #15
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Originally Posted by ACO
In an unfavorable economic context, the idea was to modify the cars as little as possible. All entrants want to be able to use their current cars in 2010, and possibly in 2011 and beyond.
Running current cars instead of using 2011 rules is the cheaper solution. Good thing that the ACO is seeing this.
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