What turbo PSI are moderate to heavily modified Coupes running on the road . I am thinking around 22psi would that be correct The reason i ask i was reading an article on the new Mercedes A45 amg M139 engine which is apparently is the most powerfull 2 litre standard production road going engine ever . 208 bhp per litre and running a standard 31 psi ?At 31PSI there must be room to go even higher Sound very high for a petrol road going engine and its amazing how engineering has moved on in the last 25 years . I remember back in the late 80s and early 90s the Cosworth Sierras in BTCC were runnung 36psi .In the beginning with that much boost the heads were lifting I know other engines run higher boost but i am talking about road based engines
Last edited by robcoupe20vt; 04/03/2020 14:25.