wastegates????
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SpeedRacer1
- Posts: 3144
- Joined: Fri Jul 26, 2002 7:44 pm
- Car: 1990 240SX, G35
Not unless your pushing lotsa power 
I'll just let HKS do the talking:
HKS external wastegates are race proven units that offer unsurpassed craftsmanship, reliability and functionality for a diverse range of applications. Each HKS wastegate is constructed with a stainless steel valve, a die-cast mount base and valve seat, a fully sealed shaft and a high temperature resistant diaphragm. Available in three different types, Standard, Racing, and GT, HKS has the appropriate wastegate for every application and performance level. The Standard Wastegate utilizes a 40mm valve and is rated to applications producing upwards of 500 horsepower. The Racing Wastegate utilizes a 50mm valve and supports up to 1000 horsepower. The GT Wastegate is the largest of the series and utilizes a 60mm valve to support applications producing well over 1000 horsepower. Each wastegate type offers several different spring rates for various boost pressure levels. Also available are universal base flanges, flexible outlet tubes, barb fittings and gaskets for custom applications.
To better understand the benefits of the HKS external wastegates, a simplified understanding of the operations of a wastegate is needed. To build boost pressure, the wastegate diaphragm/valve remains closed in order to direct all exhaust energy to the turbine. To maintain a given boost pressure, the wastegate (positioned upstream of the turbo) reroutes excess exhaust energy around the turbine wheel by opening its diaphragm/valve. As greater exhaust output is created from higher levels of engine performance, the stock internal wastegate actuators begin to lose their effectiveness because the amount of exhaust flow to be bypassed is now beyond their intended operating range. As the result of exhaust flow being greater than the valves’ capacity to discharge, more exhaust flow is directed to the turbine and additional boost is created, which is commonly referred to as boost creep. Boost spikes may also occur due to the larger volume of exhaust energy now being created.
HUAH HKS!
I'll just let HKS do the talking:HKS external wastegates are race proven units that offer unsurpassed craftsmanship, reliability and functionality for a diverse range of applications. Each HKS wastegate is constructed with a stainless steel valve, a die-cast mount base and valve seat, a fully sealed shaft and a high temperature resistant diaphragm. Available in three different types, Standard, Racing, and GT, HKS has the appropriate wastegate for every application and performance level. The Standard Wastegate utilizes a 40mm valve and is rated to applications producing upwards of 500 horsepower. The Racing Wastegate utilizes a 50mm valve and supports up to 1000 horsepower. The GT Wastegate is the largest of the series and utilizes a 60mm valve to support applications producing well over 1000 horsepower. Each wastegate type offers several different spring rates for various boost pressure levels. Also available are universal base flanges, flexible outlet tubes, barb fittings and gaskets for custom applications.
To better understand the benefits of the HKS external wastegates, a simplified understanding of the operations of a wastegate is needed. To build boost pressure, the wastegate diaphragm/valve remains closed in order to direct all exhaust energy to the turbine. To maintain a given boost pressure, the wastegate (positioned upstream of the turbo) reroutes excess exhaust energy around the turbine wheel by opening its diaphragm/valve. As greater exhaust output is created from higher levels of engine performance, the stock internal wastegate actuators begin to lose their effectiveness because the amount of exhaust flow to be bypassed is now beyond their intended operating range. As the result of exhaust flow being greater than the valves’ capacity to discharge, more exhaust flow is directed to the turbine and additional boost is created, which is commonly referred to as boost creep. Boost spikes may also occur due to the larger volume of exhaust energy now being created.
HUAH HKS!
Good post Speedracer. Couldn't have said it better myself. But then again, there aren't many companies that could, let alone some average car junkie. Hopefully that will have answered your question Revhard. You don't need to upgrade your wastegate until after you have upgraded your internals as well as your turbo. I know that on my 3rd Gen RX-7 I am still using the stock internal wastegate, though it's been ported, and my motor is ported as well as running much higher boost than stock level. Hope that helps you out. Best of luck. Laterz.
Zach
Zach