Start up Rev
#24
It is there for show. As I posted in the other thread, if you start from cold you get the bark, if you then immediately shut off the engine and restart you don't. It's something that you should be able to turn off. I generally love it, but at 5:30am etc it has potential to disturb. You have to think of others.
#25
Me thinks the sound may dissipate rather quickly on the outside, distance-wise, more than I perceive sitting on the inside. And start-up is just that--over with in a couple or three blinks. It's not like an incessant blat from some cheap glass pack.
#27
My Neighbours have certainly noticed the bark and said so, they haven't complained yet as they are nice people who we get on well with but I am acutely aware that so far it hasn't been very often very early, but I do regulalry head for the airport at 5:30 or earlier during the week.
I also leave early on the ocassional Sunday to get to Cars and Coffee.
I also leave early on the ocassional Sunday to get to Cars and Coffee.
#28
My neighbors and I all moved into our development at the same time (new construction at that time). Guess they broke us in (my family and I) as much as we did them, heh. In any event, the personality of every neighborhood is different, of course. It looks like you're doing what you can to minimize complaint.
#29
My DB9 exhibits the same behavior - louder on cold startup than warm.
On the Aston the exhaust valves are operated via vacuum - vacuum is what keeps them closed until the computer tells the vacuum pump to open them. The valves can be left permanently open by disconnecting the vacuum lines.
I've always assumed the louder cold-start condition was simply vacuum bleeding off over night. I wonder if Jaguar's system is the same architecture?
On the Aston the exhaust valves are operated via vacuum - vacuum is what keeps them closed until the computer tells the vacuum pump to open them. The valves can be left permanently open by disconnecting the vacuum lines.
I've always assumed the louder cold-start condition was simply vacuum bleeding off over night. I wonder if Jaguar's system is the same architecture?
#30
My DB9 exhibits the same behavior - louder on cold startup than warm.
On the Aston the exhaust valves are operated via vacuum - vacuum is what keeps them closed until the computer tells the vacuum pump to open them. The valves can be left permanently open by disconnecting the vacuum lines.
I've always assumed the louder cold-start condition was simply vacuum bleeding off over night. I wonder if Jaguar's system is the same architecture?
On the Aston the exhaust valves are operated via vacuum - vacuum is what keeps them closed until the computer tells the vacuum pump to open them. The valves can be left permanently open by disconnecting the vacuum lines.
I've always assumed the louder cold-start condition was simply vacuum bleeding off over night. I wonder if Jaguar's system is the same architecture?
The ECU is programmed to rev the car on start-up.
#33
#34
My point was it isn't a question of opened valves per se (vacuum or electric) causing the loud start-up, but a function of ECU programming. I say that because cars without active exhaust also start with the high rpm bark.
#35
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Thang Nguyen
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10-12-2015 01:25 AM
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