Throttle Body/Valvetronic
08-11-2005, 08:02 AM
#1
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I'm a little confused. I didn't think the 4.4 V8 had a throttle body. I was under the impression the Valatronic system (variable valve lift) was used in place of a throttle body. If the valvetronic is suppose to be controlling the amount of air entering the cylinder, what the point of the throttle body? What enhancements does the Dinan unit offer (Bigger diameter)? Can someone shed some light on this issue for me.
08-11-2005, 08:10 AM
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Many people seem to be under the false impression that the new Valvetronic engines don?t have a throttle body. This is clearly not the case, however the throttle body for these applications functions as part of the traction control system, as well as a ?safety valve? of sorts. Regardless of the function, the size of the hole still represents a restriction of intake air-flow, making the larger bore of the Dinan high flow versions enable the engine to breathe better for a 8 hp and 8 lb/ft torque gain for all applications except the X5 4.8is, where the throttle body is good for an additional 9 hp. The most noticeable increase in power occurs in wide-open throttle scenarios.
08-11-2005, 12:58 PM
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Remember the carburator? What's the purpose of the butterfly? What's is the purpose of the intake valve? If you understand these two things, you'd know why. The only thing can replace throttle body is direct injection.
The throttle body in E60 is drive-by-wire, not by cable.
The throttle body in E60 is drive-by-wire, not by cable.
08-11-2005, 01:04 PM
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My Ride: 2015 535D M Sport
Originally Posted by my530i' date='Aug 11 2005, 02:58 PM
Remember the carburator? What's the purpose of the butterfly? What's is the purpose of the intake valve? If you understand these two things, you'd know why. The only thing can replace throttle body is direct injection.
The throttle body in E60 is drive-by-wire, not by cable.
The throttle body in E60 is drive-by-wire, not by cable.
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