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Initial D 4th Stage comments... - Archive Topic (Locked)
3sgte:
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Isnt that a bypass valve? Afaik a wastegate evacuates the turbo when you step off the gas to remove the resistance of the compressed air and makes this lovely sound *g*
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What you are referring to is a blow off valve. It serves a different purpose.
It allows the turbine to spool down a bit more gracefully when the throttle is suddenly closed.
Eg, the turbo is spinning like nobody's business, pumping a massive volume of air. Where does all that air go when the throttle is closed? The turbo does not want to stop spinning instantly, if it meets a sudden pressure increase at its outlet as it is spinning at speed, that wall of air will slow it down quite abruptly.
The blowoff valve opens when there is boost and a strong vacuum in the intake. Non OE ones are often adjustble.
Dapprman:
The dump/blow-off valve also protects your turbo impellar. If the pressurised air is forced back in to it, it will suffer from damage, as might the waste gate. The sound of waste-gate flutter is nice, but not a good thing for the turbo.
JC:
If you want to know what 30psi of boost with no blow off valve does with an engine, stick some dynamite in your block... It'll give about the same effect :/
I still don't like turbo's, even if you set them up right, they still don't quite make the mark that a supercharger does... The right supercharger, can in most cases, outperform a turbo all the way through the powerband (Hey, for anyone wondering, the TRD Atlantic engine in the AE86, would need a custom supercharger, else it would melt, since superchargers spin at about 1.26 times faster than the engine does, so 11,000rpm... 13,860rpm... Bye bye Supercharger :P)
CooBlueDAB:
--- Quote ---Ok First of I would like to say thanx for all the info guys, u have a lot of knowldge.
I'v found aout a lot by just reading this thred. Its nice to know things about other racing sports, I say this b/c I have not goten in to drift or raley racing, yet, I'm more of a drag racer I have a 94 300ZX Twin Turbo. putting out about 1200 hp and i put down mid to low 10's and once got a 9.967 i was stoked to see a 9 lol.
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1200 HP? and into the 9s? on those rims and body kit? Sorry if I seem rude... but what do you have in the engine to make it run that? what are the mods...
Ive never seen anyone that says they are a drag racer with a body kit nor those huge rims because it slows them down.
If you can prove me wrong, I'm sorry, but until then, I will suspect it is mildly modded if that.. with only a body kit that adds "900-1000" whp...
chichin0:
with only a body kit that adds "900-1000" whp...
saw one of these body kits on a Geo prism the other day.... lmao
Seriously though, have you got any drag slips to back up this claim? It seems pretty far fetched. Most 9 second cars (unless you are watching the fast and furious) are completely stripped and have only essential mechanical and aerodynamic parts on them. I will reserve judgement because I have been wrong before, but post some slips so we know this isnt a car off ebay that you claim is 1200 bhp and running 9 sec 1/4.
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