[QUOTE=Bo_Vien,May 19 2005, 01:18 AM] Sorry but I have a stupid question now.

 

[QUOTE=Bo_Vien,May 19 2005, 12:18 AM] Sorry but I have a stupid question now.

 

Xviper, thanks for the taking the time to explain all of that. To make sure I understand this, what you're saying is that at partial throttle at 4000 rpms (ie. cruising on the highway), there would be low positive pressure within the manfold, regardless of a S/C or a turbo. In other words, engine wear would approximately be the same under this condition. Now, under WOT conditions at 4000 rpms, the turbo would create more positive pressure than a S/C would. Engine wear would be greater for the turbo in this case. Did I understand that correctly?

 

Actually, at 4000 rpm cruising with either F.I., you would have manifold vacuum (negative pressure).

The rest of it, I think you've got a pretty grasp of things.
When it comes to "wear", certainly I believe that although you would have more wear in the turbo (WOT) compared to the S/C, that wear may not be significant (or measureable) based on the fact that this engine is so well built and so well lubricated (except maybe for the earlier models with the 2-hole oiljet bolts). Unless you plan to run F.I. for 70K, 80K, 90K or 100,000 miles, it might not be worth worrying about the difference between the two.

 

Yes I have and I think I have taken both systems almost to the extreme.
The turbo is way better than the sc in many aspects of FI. It's best to keep the car NA or take the full plunge and go turbo. The SC was just a little bridge that left me unsatisfied and endless desire for more power in the midrange.

 

Not that it matters, but top fuel dragsters are making 5000+ hp.