Quote:
Originally Posted by karguy
The new direct injected V8 is not necessarily better.AFM... 
Which makes me think why would GM go through the additional cost of direct injection (as in a more expensive higher pressure pump) if the engine really doesn't make more power (additional variable valve timing) or get better mileage without AFM...
Also on direct injected engines intake valves can get more carbon buildup on intake valves since there is no gas that can clean them.
Another hint may be Porsche.While the new regular 911 get direct injected engines,the new sports GT3RS will have not direct injection.
Direct injection might be another gimmick for maybe slightly cleaner emissions...who knows? |
One of the big things is the difference in power curves between DI and non DI engines. If you look at a dyno graph the HP has a curve where the TQ is flat in the DI engine. I believe the AFM will be used just to save on the GG tax.