Questions regarding Subaru Impreza 2006.?

[CSY]

I drive a Subaru impreza 2006.Why is the engine sound loud when it just started n it becomes softer after 5 mins warm up?

What should be the correct exact setting for my VACCUM and AIR FUEL on my apexi turbo timer on my impreza?  I installed a vaccum meter for my impreza(NOT DEFI).  Sometimes the meter vibrates and has a ticking sound when i accelerate.  I change to other meter and is also the same.  Is this normal or is there a problem with my tuning?  Thanks.

[MichaelB]

How much louder is it?  Perhaps the normal warm up cycle is what you are talking about?  The engine runs a little richer and faster until it's fully warmed up.  Or maybe you just get used to the sound after a few minutes?  What mods do you have?  An intake perhaps?  Unless you've made some change there is no reason it should be a lot louder, maybe slightly louder, but not a lot.



I have a vaccum meter on my 01 impreza, it does not vibrate or tick under any conditions.  I think there probably is some problem, although I have no clue what it might be.

[yitogwa]

I had a similar problem with my '95 Impreza. The mechanic basically said that the engine wasn't geared for the cold weather (at the time, I lived in the arctic region of upstate New York) that the engine would sound loud at first because it was adjusting to the weather, that it was warming itself up.



This may be the same situation or it may not be, but this is something to consider.



Oh, it has since calmed down, now that the engine has lived most of its life there in upstate, NY. An oil change definately helped it calm down some, too.



But I wouldn't assume this to be the problem right away.

[BP]

Do you have a WRX or 2.5RS?  I'm assuming you have a WRX (or STi) since you have a turbo timer (which you really didn't need but that is another discussion).



By Vacuum meter do you mean you put a Boost Gauge on?  Vacuum is mostly for the non-turbo engines.



Anyways, you should be fine with the slightly louder engine sound at cold start up...the car is warming up and holds idle at higher revs (as well as runs richer) until the engine is warm.  Heck, the higher revs alone could be causing the "louder" engine sound.



Your car should still be under warranty so you should probably take it into your nearest dealer for a check up.

[x_ill]

Subaru boxers aren't keen on being cold, on most of them you will hear piston slap when they are cold as the tolerances of the rings are a little loose to let it be a bit more free up top.  They are naturally fairly loud motors, just wait till you put in some solid motor and tranny mounts woohooo.



What do you mean by correct setting, are you trying to play with an AFC and you don't know how to tune?  If so yank that thing out and throw it away, go buy an accessport and get it protuned, or some other real EM(like a hydra) and have someone who knows what they are doing tune it.  The fact that I don't note you having a wideband installed and that you have to ask is a pretty good bet that you shouldn't be messing with fuel settings for your car.



Turbo timer isn't needed so long as you have the stock turbo or upgrade to an aftermarket water/oil cooled turbo.  The subaru turbos are cooled by oil AND water.  After you shut the motor off the heat from the turbo causes the water to continue to flow and cool the turbo, a turbo timer is just wasting gas.  



If you put a vacuum meter on a turbo car you are making the meter hits its maximum every time the turbo spools.  BOOST meters measure both vacuum(pressure below atmospheric pressure) and boost(pressure above atmospheric pressure).  A normally aspirated car constantly creates vacuum and as such only needs(well doesn't really need on most cars) a vacuum gauge.  A turbo car creates boost which is above atmospheric pressure which means a vacuum gauge won't read it.