Aston Martin DBR9s’ ALMS Spec.
”Aston Martin has been handed a double performance break (in the ALMS),” reported Autosport recently.

IMSA published a bulletin yesterday (March 1) to clarify where the DBR9s stand for 2006 (in the ALMS), and IMSA COO Tim Mayer explains the details.

“The DBR9s will be racing in a different configuration than we saw last year at Laguna Seca,” he explains. “Even there, we saw a difference in the performance between the C6.Rs and the other cars in the class.”

The DBR9s ran at 1100 kg last year, with two 31.2 mm restrictors: ACO regulations stipulate that closed cars run 25 kg heavier this year, to allow for air conditioning equipment (which becomes mandated in 2007).

In addition, the C6.R and DBR9 were handed an extra 25 kg penalty from 10 August 2005, because of the speed the cars displayed at Le Mans last June. IMSA has cancelled the 25 kg penalty for the DBR9s.

“They will be running an aero package that is different from the one that is considered optimal,” explains Tim Mayer.

The ACO banned the more bulbous front apron that the Aston Martins used in the 24 Hours (in its same, July 21 2005, bulletin).

“So the Aston Martins’ starting weight will the standard 1125kg for the class,” continues Tim Mayer, “and they will have the option to move up to the restrictor column for 1175kg.”

So that would mean either running with two 31.2 mm restrictors again, or adding 50 kg and running with two 31.8 mm restrictors.

”It would not be correct to say that the Astons are running two columns "more" than the Corvettes, because the Corvettes use an alternate formula to derive their restrictors, based on their two valve head design,” states Tim Mayer. “But also the 1175 column is actually only one column over from the 1125 column.

”You will see a similar move with other cars in the class that are entered under different configurations than those that applied last year.

“Based on the results from last year from various cars in various configurations, we believe that these changes are appropriate to put the various cars in the class, which enjoy similar levels of development and support, within what we consider an acceptable band of performance to ensure competitive racing in the class,” concludes Tim Mayer.

The other change to the Aston Martins this year is that they will be running on Pirelli rubber, rather than Michelins.

The latest bulletin also mentions adjustments for the Saleen S7R, the Lola EX257 (Lola B01/60), the Audi R8, the Courage LMP2 Mazda and the Lola B05/40 (fitted with a 2 litre turbocharged engine).

We’ll try to explain the prototype changes separately. Regarding the Saleen, the bulletin specifically mentions the “Konrad Motorsports Saleen S7R”, and as Franz Konrad suggested on dsc recently, his cars will have some modest adjustments - that is, moving to one restrictor size larger, they can run at 25 kg less than their chosen restrictor table weight, and their refuelling restrictor will measure 38 mm.

The standard size for refuelling pipes is 33 mm. 38 mm is the internal diameter that applies to diesel-powered cars (and now the Konrad Saleens).

 

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