2010 Technical Regs.

[Parsnip]

I know it is early days yet, but spotted this today:

http://www.racecar-engineering.com/news/cars/39444...

Slower diesels and faster petrols? Very good thing. Having an orange and blue car on the podium next year would do niceley thanks.

[Red Firecracker]

Are Audi/Peugeot being sponsored by Gulf next year then?

You might have overlooked this little rule;

ACO said:

GT1 engines in P1 will breathe less easily through 2.4% smaller restrictors.

which means the Lola-Aston unhomologated engines will be less powerful next year.

However, these rules really help the Ginettas, which is excellent.

[Parsnip]

I only saw this:

Diesel Engines: 2.1% decrease in restrictor size (to 37.5mm), Supercharger pressure reduced by 5.8% to 2590mbar

Petrol Engines: 5% increase in restrictor size (to 33.3mm)

GT1 based Engines: 2.4% increase (33.3mm)

GT1 based engines can be fitted with DBW throttle, direct injection and the design of the air box is free.



I'm a little confused, are GT1 based P1 engines getting bigger or smaller restrictors?

[Red Firecracker]

P1 cars that use GT1 engines (Lola Aston-Martin are the only ones so far) will have a small restrictor next year. Here's the link to the ACO document;

http://www.lemans.org/24heuresdumans/ressources/pd...

In brief, these engines will have the following changes;

GT1 engine
(de 5.5 à 6.l)

	2009	2010	2009/2010 Variation (air restrictor surface)
Restrictor (for 2 restrictors)	32.7 mm	33.3 mm	+ 2.4%
Advantage engine restrictor over 8 cylinders	0.4 mm	0.2 mm
Restrictor advantage for closed cars	0.3 mm	0.3 mm

So from that I take it as a 2.4% bigger surface area of restrictor (DSC confirms as well).


Also the other details you mention are in fact;

ACO said:

GT1 engine regulations in LM P1:

GT1 engines installed in LM P1s must comply with article 5 of the LM GT1 regulations
(see: www.lemans.org) with the exception of:

• Accelerator (free)
• Direct injection (modifications to the cylinder heads must be approved by the ACO)
• Air box (volume free)

Remember also, these are regulations for next year only. The 2011 regulations could be quite interesting when they are released in September.

[ellroy]

so what aston have to do to avoid this penalty in order to get full homologated(?)status?

I know it'll be in the regs somwhere, but assume some kind soul knows already and would be nice enough to tell me?

[Parsnip]

Red Firecracker said:

So from that I take it as a 2.4% bigger surface area of restrictor (DSC confirms as well).

Hmm, I was thinking of it as the diameter of the area open to flow in the restrictor - seems the logical way to designate the size to me - especially given that the units are for a length, not an area, might just be my interpretation though

[Nick M]

Parsnip said:

Red Firecracker said:

So from that I take it as a 2.4% bigger surface area of restrictor (DSC confirms as well).

Hmm, I was thinking of it as the diameter of the area open to flow in the restrictor - seems the logical way to designate the size to me - especially given that the units are for a length, not an area, might just be my interpretation though

+1

[Red Firecracker]

The regulations state 'air restrictor surface' though.

ACO regs are never known to be that well worded, bu that was also the report from the ACO press conference on DSC.

[Red Firecracker]

ellroy said:

so what aston have to do to avoid this penalty in order to get full homologated(?)status?

I know it'll be in the regs somwhere, but assume some kind soul knows already and would be nice enough to tell me?

Not use a GT1 engine.

There was a lot of contention this year (hidden by the Peugeot / Audi squabble) about Aston's engine. Oreca were ready to protest it along with some other teams. In the race they ran the car with direct injection. There isn't (wasn't) a car in the Aston range with that system on it, thus the engine was unhomologated. If they had reached the podium I suspect the teams would have protested. It gave the cars a fuel economy advantage.

[ellroy]

Red Firecracker said:

ellroy said:

so what aston have to do to avoid this penalty in order to get full homologated(?)status?

I know it'll be in the regs somwhere, but assume some kind soul knows already and would be nice enough to tell me?

Not use a GT1 engine.

There was a lot of contention this year (hidden by the Peugeot / Audi squabble) about Aston's engine. Oreca were ready to protest it along with some other teams. In the race they ran the car with direct injection. There isn't (wasn't) a car in the Aston range with that system on it, thus the engine was unhomologated. If they had reached the podium I suspect the teams would have protested. It gave the cars a fuel economy advantage.

Cheers,so if they brought out a standard dbs/db9 with the engine, assuming it would fit, they would be fine. Is it like the old rallying regs that they would need to sell a certain amount to get through the regs?

[Red Firecracker]

Yup, same basic homologation rules.

It's just the injection system that is (was) iffy. The block and other ancillaries are the same as the production range/GT1 car.