TurboTony

Is it common when its colder outside for a car to over boost? Because I believe mine is doing it.

99lspwr

anytime the air is denser, you may tend to boost a pound or two higher...

Sohc Driver

here's another guess...can't cold conditions make the spring in the wastegate stiffer? Reasons i came up with this idea is because particles tend to move slower in cold conditions..thus making the spring less maleable or should i say less flexible? I dunno..someone tell me if I am off track.

Khoi

4U2NV

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sohc Driver &raquo;</TD></TR><TR><TD CLASS="quote">here's another guess...can't cold conditions make the spring in the wastegate stiffer? Reasons i came up with this idea is because particles tend to move slower in cold conditions..thus making the spring less maleable or should i say less flexible? I dunno..someone tell me if I am off track.

Khoi</TD></TR></TABLE>

I think that's definitely a possibility, but not a probability... It's boost spiking becuase colder air is more dense, therefore more air molecules make it into the turbo to be compressed, thus more volume of air...

rocket256

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4U2NV &raquo;</TD></TR><TR><TD CLASS="quote">

I think that's definitely a possibility, but not a probability... It's boost spiking becuase colder air is more dense, therefore more air molecules make it into the turbo to be compressed, thus more volume of air... </TD></TR></TABLE>

Sohc Driver

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4U2NV &raquo;</TD></TR><TR><TD CLASS="quote">

I think that's definitely a possibility, but not a probability... It's boost spiking becuase colder air is more dense, therefore more air molecules make it into the turbo to be compressed, thus more volume of air... </TD></TR></TABLE>

I think both theories are correct. But if you think about it...particles contract and are closer together thus making the spring "stiffer" ehh well...

TurboR1391

Yeah it's common. When I was in Kentucky I my controller was set a 1 bar. On very cold nights it would read 1.2 bar.

Lucky_Smurf

It's very common and here's a pretty good theory. When the trubo is charging the air it's taking a certain volume of air at a given temperature. Since were talking cold temps you will see denser air being pushed. As this air moves through the system it's heated and expands making for more psi. Now why doesn't the spring see this and compensate? Because the expansion is happening right at the manifold and by the time the spring is reading the pressure the air has already cooled. Thus causing higher psi at the manifold and lower psi at the spring. You will also see some "stiffening" effect of the spring but not that much. The combination of the two causes more boost in colder air.

4sdB20

wouldn't colder outside temps make for better IC efficiency? this would make the air denser than normal and you would get more air in the cylinders where the heat would expand it creating much greater exhaust pressures. your WG works of the denser charge in the IM not the exploded exhaust charge so it wouldn't know until to late. WGs open only when you overboost otherwise they are closed. it's simple physics and makes sense in my head but maybe I am not conveying it well

Lucky_Smurf

No your exactly right.