joemoia

ACO press conference at Silverstone

http://www.lemans.org/24heuresdumans..._regl09_gb.pdf

2009 GT rules changes

- increase in minimum weight for GT1 and GT2

- mandatory Gurney flaps for GT1 and GT2

- decrease in restrictor size for GT1 and GT2

- increase in GT2 ride height

John Shiels

looks like all tp slow things down?


interesting reading thanks Joe!

heavychevy

More weight and more power??? Why would you ever increase the weight for a whole class (or 2)?

John Shiels

who's getting more power?

HORNDAWG

Nobody! But you already knew that.


L.P.

parkerracing

Sounds like more power to me

Or am I mis interpreting that and the the restrictor is getting SMALLER? :eak:

AU N EGL

a decrease in restrictor size for GT1 and GT2

Means a LARGER opening. i e more power

an increase in restrictor size would mean a smaller opening.

less power

joemoia

what I meant was decrease in the size of the hole. sorry for the confusion

John Shiels

decrease in restrictor size means smaller to me. less power.

John Shiels

ACO 2009 Rules - Less AND More
“Sportive competitiveness”, “Safety improvement through speed reduction”, “Cost reductions to ensure the preservation on motorsport”, and "Le Mans is ready to profile itself as the big laboratory of new automotive technologies: hybrids, alternative energies, etc.” drove ACO rules-making.

Uh huh. So, their 1st decision is to slow the LMP1 diesels to make gas engines more competitive [or as BBV sees it- Advancing the past!]. However, that opens the door for more GT1 engine applications in LMP1, so the Katech phone number is....!!

BBV's rules-change summary-

* GT1 gets slower [may drive like a GT2 BEFORE 2009!]. 25kg heavier, 2% smaller engine restrictors [no adjustments for A/C anymore], a 25mm minimum wing Gurney [eg- more drag?].

* Pit stops get longer. Only 2 mechanics for tire changes, only 1 air gun.

more people unemployed

* Cars get quieter. 112db noise limit.

* 'Green' hybrids and bio-fuels get 2010 / 2011 focus. Hybrid homologation rules are coming and at least 1 mfgr. is ready. Anyone else want to see a ‘KERS Corvette’? [Rolls off the tongue, at least.]

* 2011 rules call for LMP1 to run smaller LMP2 engines [and LMP2 engine rules call for production-based designs AND LMP2 power to be sourced from GT2; eg- the new GT class]. So, Corvette EVO [in some form] may still find a home and be easier to do than ever!

heavychevy

That's what I thought????


I know the SCCA refers to it in this manner.

joemoia

Under the current ACO regs, the max. displacement allowed in LMP1 for NA race or homologated LMGT1 engines is 6.0L

HORNDAWG

You better re-read the statement from the ACO, cause that is bass ackwards of what they said!! They aim to slow everyone down, not give more power/speed.

L.P.

HORNDAWG

The restrictors will be getting samaller, i.e. less power!


L.P.

John Shiels

they are thinking it said decrease in restriction

AU N EGL

Lane

It is translated from French. It is Bass ackwards anyway you read it.

YES I know the ACO wants to slow cars and classes down, and why on the other form I keep saying they rules are not detailed enough and subject to interpretation. or in the spirit of.

This is were that French to English translations is worse then Googles

Time the ACO uses different words or puts mm diameters for restrictor sizes

heavychevy

I agree, the statement in and of it self is backwards, I know most of us have watched ALMS and Rolex Speed GT etc. And the larger restrictors always went on the faster cars.

By definition restrictors reduce air flow and therefore reduce power. Same for NASCAR as well. So a smaller one will do THE OPPOSITE.

http://www.7extrememotorsports.com/l...rvette-c6r.htm

" The ALMS rules mandate the use of air restrictors to equalize the performance potential of the wide variety of cars that compete in the
series. The size of the restrictor is determined by the vehicle's weight, engine displacement, induction system (naturally aspirated or
turbocharged) and other factors. The C6.R Corvette, for example, is required to breathe through two 31.8-mm restrictors. These orifices
are about the size of a 50-cent coin.

Much like the carburetor restrictor plates used by NASCAR on superspeedways, the ALMS air restrictors limit airflow through the engine,
thereby controlling the horsepower produced. Moreover, ALMS officials can change the size of the restrictor orifice to maintain a level
playing field.
The ALMS rules mandate the use of air restrictors to equalize the performance potential of the wide variety of cars that compete in the
series. The size of the restrictor is determined by the vehicle's weight, engine displacement, induction system (naturally aspirated or
turbocharged) and other factors. The C6.R Corvette, for example, is required to breathe through two 31.8-mm restrictors. These orifices
are about the size of a 50-cent coin.

Much like the carburetor restrictor plates used by NASCAR on superspeedways, the ALMS air restrictors limit airflow through the engine,
thereby controlling the horsepower produced. Moreover, ALMS officials can change the size of the restrictor orifice to maintain a level
playing field."

heavychevy

http://en.wikipedia.org/wiki/Restrictor_plate

burners

You guys are just getting your terms turned around, that's all. Restrictor or restriction, they are saying reduce the restrictor size i.e. smaller diameter opening or increasing the amount of restriction both of which mean less air allowed into the engine. You know their intent is to slow the cars so use that outlook when choosing terms. Otherwise, I would have thought that they would reduce the complexity of the cars to make them more affordable. Also, why not work with the tire companies to reduce the tire grip and/or increase the durability rather than limiting the crew? That seems like a weird way to do it.

AU N EGL

Tires are already double and triple stinted.

The French ACO and FIA always do things bassackwards