klaw81
New Member
You're right, the Supra is an awesome car and gets way better with a few simple mods. But you should brush up on your turbo knowledge.....all Supras and all turbo cars have wastegates, and nearly all turbo cars have blow-off valves.Scotty_Doesn't_Know said:I assume you mean blow off when you're talking about the "pffft" noise. Actually, the better option is a waste gate. Blow off valves are for show - "LOOK AT ME AND MY TURBO CAR". Waste gates are MUCH more efficient and provide more continual power.
Best Twin Turbo car I've driven - 2000 model Twin Turbo Toyota Supra straight 6. No blow offs or wastes gates (the guy had just got it) and it blew EVERY WRX (incl STis) that pulled up next to us. No V8 even came close Even a HSV GTO Monaro! Was awesome!
A blow-off valvle vents usused boost in the intake when the throttle is abruptly closed. The pssssh! noise is the compressed air escaping. The idea is that the turbine isn't suddenly stopped dead by the sudden loss of air flow - sudden stops are bad for turbine wheels because of the shock loading, and bad for throttle response because the turbine needs to reach high speed before more boost is created - which means you lose power momentarily at gear changes. A good blow-off valve makes a world of difference to the driveablility of a car. However, the noise is optional - most factory blow-off valves are virtually silent.
A wastegate is a mandatory part of any turbo installation on a petrol engine. Their function is to control boost by allowing some exhaust gas to bypass the turbine - this keeps the turbine speed constant regardless of the volume and velocity of exhaust gas coming from the engine. Wastegates are commonly built into the exhaust turbine casting of a turbo, but high-power installations often have an external waste-gate because they are more efficient and can flow a larger amount of gas.
And Rombles, I agree that a turbo diesel is a very likely addition to the line-up, given the massive increase in diesel passenger car sales in Oz over the past 3 years. And it wouldn't have to be boring either, some of the diesel Euros have some serious stick.
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