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I'm still wondering if Audi have even stuck with the VGT turbo technology. It does seem that at very low engine speeds that the R18 has some slight turbo lag (like in the Sebring video) like the R8 and R10 had, and of course, there's the fact that Audi and Honeywell/Garrett spent 3 years (back in the middle of the R10's factory days) and probably quite a bit of money to make the VGT turbo stuff work on the R15.
It doesn't make sense that Audi would squander that investment unless nothing substancial was gained. But the Audi may be using one turbo (given the Garrett info, a compound turbo is unlikely), and VGTs do still have some lag at very low engine speeds (idling/initial start up in the case of the R18) when the throttle is rapidly opened to the full.
However, I did hear a noise in the Sebring video that sounded sort of like a wastegate when the R18 took off in the pits. Maybe it's a VGT that uses a wastegate for some reason (saftey/reliablity factor)?
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