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Old 20 Mar 2013, 17:28 (Ref:3221814)   #1
andy97
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Join Date: Aug 2003
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Castle Donington
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andy97 should be qualifying in the top 10 on the gridandy97 should be qualifying in the top 10 on the grid
Turbo equivalence

Can anyone tell me definitively please when the equivalence factor for turbos changed from being 1.4 to being 1.7? ie what year?

Was there any specific reason or example car that was responsible for this? Any reference material?

Thanks
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