Since some people still deny the existence of Turbo Lag in Gran Turismo 5, I want to show that it does in fact have this implemented in the game. One of the problems as a few other members (including myself) have said before, the turbo gauge itself is not always accurate in the game. But this doesn't mean there isn't turbo lag in the game. ====================== Here's a easy test to prove its existence in GT5. This video is to demonstrate the existence of Turbo Lag in Gran Turismo 5. To demonstrate this I took a stock Option Stream Z on Special Stage Route X, to give the best conditions to display my evidence. I start off at around 3,000RPM before holding the throttle at 3/4 application causing the RPM to climb steadily. As the RPM rises the turbo will begin spooling; once the RPM reaches roughly 4,000 RPM the engine is producing sufficient exhaust flow to build up boost, otherwise known as the "Boost Threshold". From this point forth you can see the boost increasing in small increments, this is known as "Turbo Lag" - the time between Boost Threshold being met and the turbo charger reaching "Peak Boost". In this instance the Boost Gauge is able to show the correct values for a period of time due to the lower throttle input, this leads me to believe that Exorcet is indeed correct about the Boost Gauge which I have said from the beginning - upon reaching what the Gauge reads as "Peak Boost" you can both hear and feel the turbo continuing to spool. I find this to be conclusive evidence that Turbo Lag is indeed present in Gran Turismo 5, despite the misleading gauges.