Quote:
Originally Posted by solstice
I suspect that 18 psi is close to max what you can run with 10.2:1 compression ratio on 93 octane. The combustion chamber pressure is built by compression and bost and when you reach self detonation it's game over. Sure you can keep retarding ignition but it's not efficient. The GT2 RS runs 23 psi at peak boost I think but it's compression ratio is only 9:1.
Here's some play with numbers to give an idea vs the GT2 RS
18psi x 10.2 = 183.6
23psi x 9 = 207
207 / 10.2 = 20.2
So maybe there is room for ~ 2 psi tune if the turbos can generate it.
( I realize this is over simplified and not mathematically or scientifically precise but it gives us some idea )
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I agree and good post. Theres still a lot to figure out but generally speaking I just don't think the f8x is going to have the ability to pull 75-100 hp from a tune like some people think. 2 psi (which seems true) isn't going to give you nearly that much power either if it can be done.
The GT2 RS still has a lot left on the table since the turbos are bigger and can push well more than they have stock especially seeing its a Mezger motor and compression isn't that high.