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Initial D 4th Stage comments... - Archive Topic (Locked)

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3sgte:
JC:
Possibly to prevent the turbo from overspeeding in the rarified atmosphere at high altitude...

Eg. the exhaust flow to spin the turbine is there, but there is not enough resistance (intake air density) to prevent turbine overspeeding

JC:
From what I read of the whole thread (8 stinking pages of it mind you), it's basically just to spool the turbo up, then cuts out after it's spooled nicely, although from what some of the people on there were speculating that the turbo spools at 6000rpm (Considering the redline on EVO's, that's pretty damn late and just top end power)

The setup has been done before by people, and it has worked out after all the hassles have been ironed out, but I'm still waiting to see if it actually keys in okay, else kaboom! (Nice to know he's getting the gearbox made here, god knows why)

I guess that without the supercharger, you'd be there for ages waiting for spool, and when it does, you've got to shift, thus having a massive lag without having the cubic inches of block size and capacity to back it up, as if it was a V6 or a V8, you wouldn't need the supercharger as much, the engine would produce enough exhaust to spool it early.

The one thing they'd definately have a problem with, is if they tuned it for the thin air there, then raced at sea level without a retune... That'd increase the risk of blowing the thing apart dramatically, as it'd be doing too much cfm and psi to handle... In theory

Brokenimage0:
no no no what he means is at higher altitudes the air is thinner so the turbo wont act as efficently so he needs a way to get more thin air in than by just the turbo alone. At least im pretty sure thats what he meant,

Elchfaenger:
Well, about what altitudes are we talking? Surely less than 1000m, right? I dont think this would be a problem for turbos, because the air density at 0 and at 1000m differs by 15%.
we all know that the air density also changes with the temperature. In a temperature range between -10°C an 30°C it differs by ~15% as well (at sealevel)
But a turbo doesnt overspeed in the summer, right? So it wouldnt at 1000m altitude

Brokenimage0:
well im not sure since he didnt name a place but if it was like the us mile high city then it would since its around 2km(not sure of the exact conversions). But my favorite is a high rev engine like the rotarys and such its sounds so awesome.

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