Quote:
Originally Posted by NESW20
if i'm not mistaken, often times rally cars don't run wastegates, they just let the boost spike as high as it will go, and it trails off at higher rpms due to the restricter.
as far as turbo'd n/a engines, it's alllll in the tuning (well, mostly). you could run 5psi and blow your ring lands to pieces, or you could 10psi and have a safe, reliable engine. tuning, fuel, and maintenance.
-Mike
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Ehh... yeah, the tune is key, but there are mechanical limits to how great cylinder pressures can be before something gives. You can break a piston even on a perfect tune.
Turbo motors just tend to have beefier internals to withstand the greater pressures exerted on everything.
Now of course, throw some detonation in there and everything from a melted piston crown to a broken rod and cracked block can happen. Even a stout motor can be destroyed in short order with a poor tune.
I'm really hoping that TRD does the R&D for me so I know what the limits are.
On a related note, in a recent interview, Tada, Toyota's chief engineer for the project, claimed 230 bhp was do-able.
If 230 is Toyota's upper target, then perhaps another 10-20% more power could be made before something breaks, given that OEM's tend to stay well below the mechanical limits of an engine.