Just wondering at what rpm does the 2006 wrx begin to create boost. Because the 05 start at about 3200 rpms, and red line at 7000, but the 06 i know(from what ive seen in pictures) red line at 6800rpms. So do 06 build boost faster because of the 2.5l. Do the 06's start to build at 3000rpm. Please let me know, thanks.
Just wondering at what rpm does the 2006 wrx begin to create boost. Because the 05 start at about 3200 rpms, and red line at 7000, but the 06 i know(from what ive seen in pictures) red line at 6800rpms. So do 06 build boost faster because of the 2.5l. Do the 06's start to build at 3000rpm. Please let me know, thanks.
it is not gonna be off by more than a couple hundred rpms. if that. the more exhaust yes the more going through a turbo, but its not like comparing an LS7 to a 2.0L motor.
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Gregory-
keep it in the dirt.
hey good question i wanna know this too - WHAT determines when the turbo goes a whining away?
issit ECU? issit the turbo's nature? issit the amount of gas you press? issit the piping?
hey good question i wanna know this too - WHAT determines when the turbo goes a whining away?
issit ECU? issit the turbo's nature? issit the amount of gas you press? issit the piping?
It is really a combination of several things.
The turbo bearing type and size of the compressor wheel. A larger wheel will spool slower than a smaller one. A Ball Bearing center tends to spin freer than a Roller type which means BB turbos spool faster.
Engine displacement/exhaust. The larger displacement the engine is the faster it should spool. The better the exhaust flows into the turbo the faster it should spool. This is why replacing the catted uppipe yields better spool at lower rpm.
there are many folks who can talk more on specifics to the WRX but basically turbos use air from the exhaust to "turbo" the intake. They use exhaust air to spin a fan that can then PUSH intake air into the engine. Thus creating boost and that wonderful added horsepower. Anyway, the "spool" of the turbo is not really ECU driven, it's more just reaching the needed exhaust. This is why reducing blocks like catalytic converters makes the car spool faster. Also, the bigger the engine the more exhaust it would put out so the faster the turbo can spool. This is also why some larger turbos are ineffective on small engines. They simply require too much exhaust to spin up by a decent RPM. If you put a GT35R on the EJ20, it'll be quite a few RPMs before the damn thing can spool enough to make power. You might not even be able to get max boost out of it at all before you run out of RPMs. Now, put that turbo on a bigger motor and it'll spool at lower RPMs.
The ECU only needs to control the wastegate. Basically, a turbo will continue to increase boost as RPMs increase (up to the peak power RPM of the motor) unless the wastegate opens to release some of the pressure. The ECU opens the wastegate to hold the desired boost.
Superchargers are similar except they use a belt instead of the exhaust to "force induction" the air from the intake into the motor.
I'm not an expert, but what I have come to learn is that the ecu has alot to do with when the engine builds boost. The ecu controls the wastegate so when you accelerate a stock WRX the wastegate is slightly open allowing the boost to build with ease. They do this for many reasons, longevity of the engine and driving ease just to name a few. When you buy an EM such as Cobb your engine creates boost quicker because its a more aggressive tune. The EM changes the wastegate cycles so under acceleration the wastegate is shut so all the exhaust gases go to building boost. Thats just my .02 cents.
I'm not an expert, but what I have come to learn is that the ecu has alot to do with when the engine builds boost. The ecu controls the wastegate so when you accelerate a stock WRX the wastegate is slightly open allowing the boost to build with ease. They do this for many reasons, longevity of the engine and driving ease just to name a few. When you buy an EM such as Cobb your engine creates boost quicker because its a more aggressive tune. The EM changes the wastegate cycles so under acceleration the wastegate is shut so all the exhaust gases go to building boost. Thats just my .02 cents.
This sentence doesn't make any sense. If it's open, it's open soley to bleed off excess pressure, not to build it more easily.
I think he's trying to say that the power will come on more linear, rather than having the wastegate completely closed and having the "hit" of a turbo coming on boost.
As for whether or not this is actually the case....?
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Please let me know, thanks.
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