I just don't see any difference on my Boost gauge. All I see with my 4" pulley is 6psi up until redline whether it's 28f or 72f. Do I notice power gain? O hell yeah.

I thought I should see some PSI gain, or is it strictly CFM that increases? For examaple NOVI1000 should be pushing 850cfm, right? Now does that change with colder weather but boost is not effected?

How does this work?

 

The volume changes (denser air is colder) but the pressure doesn't

Simple really

 

So pressure and volume don't have a direct relationship? Your science teacher is rolling over in his grave.

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on a typical mechanical gauge, you may not see the pressure difference, but its there. colder air is denser so their is more of it crammed in for the rpm your at with the blower.

 

My car usually runs at around 12ish PSI with normal intake temps (35 celcius IAT). We had some really cold weather a month or so ago and I was hitting 14.8psi (6 celcius IAT).
I posted part of the datalog on here not long ago.

 

for thos wanting to convert C to F, times it by two and add 30 So 15C is roughly 60ish F

 

Yeah there is an increase of boost pressure seen in colder weather. I get about 1.5psi difference from warm to cold times of the year. I would imagine the more your boosting, the more evident you will see the fluctuation. 6psi isnt much. You might get a .5psi change and not really identify it on your gauge.

 

On my Evo with a manual boost controller it boost about 22 psi on a hit summer day. On a cold 50 degree day the boost can go up to 25 psi.

With my s2000 I use the aem ems and aem boost solenoid and I boost 11psi and it mine get to 12-13 on cold days

 

I was gonna bring that up too. I have to change the wastegate duty cycle when the temp jumps to the extremes.