Re-map, air intake, ITG filter

[Thrumbleux]

It is also possible that air could have entered where the inlet joins the pipe to the airbox as it's a loose fit.

It must have been drawing air from somewhere! I could hear an occasional scream from the engine bay. I was worried that it had collapsed the TIK but all was fine when I checked. The whole episode is still a source of confusion - ie, how could it run so well with such constriction?

Yes, the complexities of all the factors involved are awesome and super computers are often used for modelling potential designs.

Where I culled that page from was the start of computer modelling and the move to super computers had begun - back in the early 1990s. They must be awesome by now! Essential to modelling air/fuel interaction on common rail CIs - which is feeding into DI SI engines. Sure I read though that it will be 2020 before a SI can run over the entire load/speed range entirely unthrottled - such is the complexity of achieving this particular holy grail.

One of the biggest restrictions in getting even bigger hp figures from a heavily modded suprex is the intake manifold, but if you were to address this then drive-ability would be seriously impaired, not to mention that it would also take a huge amount of development using a flowbench and engine dynometer with more than a few rejected design.

Then the single exhaust valve (or some other component) would be the restriction, and as you imply the tract lengths are compatible with mid-speed driveability.
I'm firmly of the view that when you hit a point that that much modification is required (engine or chassis) to achieve the objective then you've probably started from the wrong base!

Some free flowing experiments of my own have resulted in an engine that will comfortably travel at a constant 42mph in 6th gear at about 2000rpm (700cc with a 600cc gearbox). However throttle response is compromised and the exhaust is too loud!

Cheers!

Shorter tract lengths? Or larger diameter and lost gas speed?