[Mark O'Neal]

Originally Posted by Excaliber

I wouldn't say it's wives tale because that would indicate ALL IRS systems are superior to live axle systems when it comes to parasitic losses. I don't believe that is the case. The new Vette may well be an exception to the rule as it's been tweaked in the last decade or so, like every other rotating component in cars, to reduce parasitic loss as much as possible.

I think the ERA FIA is running a classic Jaguar IRS.

Depends on the deflection angle of the rear end. The lower it is the greater the loss.