Saturday night i was driving, and it was 35 degrees outside, and my car was pulling alot harder than normal. Now, i know our cars thrive on cold temperatures, but when i watched the boost gauge, it hit 16lbs in 2nd gear, and 18-19psi at the end of third! My mods right now are intake, stg 2, hptuners tune, and catback exhaust. My car screamed! it was awesome! Then later that night I hit 20lbs but I was too lazy to re-record it.

But what i dont understand is how would colder temperatures raise the boost? Does that mean that I am running REALLY REALLY lean?

here is a super short vid. sorry it isnt the best quality

 

I dont think that it makes you lean in the cold.

But i was enjoying 17-17.5 pounds of boost last night also. It was fun.

 

I had the same thing in a 2nd gear pull the other day. It was like 55-60 degrees that morning though. People seem to think that the gauge is messing up or the MAF is dirty. ???

 

When i was stock i have seen 13 lbs in cooler weather, but i have not seen an increase from 15 to 18 due to weather. I was worried that i'm running a little lean in colder weather though.

 

I saw 20psi today also. I was screaming 20psi on a 2.8!!!

It got me worried a little, then I remembered how cold it has gotten.

But in dead of winter I think I only saw highest of 18psi. Today, my gauge was maxed!

 

its a great feeling when you max ur gauge out lol

 

you guys may wanna check that your cat inst clogged... 2k5ss/sc? saw the same thing and when he pulled his d/p of it wasnt a pretty site. just a heads up

 

If the air is colder it is denser, and is thus more viscous since there are more molecules present in the same volume. Pushing more molecules of air past the blower even though the blower is moving the same volume of air results in a higher pressure. Its kind of funny though because running really hot air results in more pressure too because the air molecules are moving faster, but there aren't as many of them so it makes less power. As far as running lean goes, the computer should be compensating for more air by adding more fuel.

As far as the gauge goes, it has been known to get inaccurate at higher pressures and is also difficult to read due to how it is graduated. Its much better to use an interceptor or other scan gauge to keep track of air temperatures and pressures. So I wouldn't be too concerned. If it continues to be a problem, especially when the weather gets warmer or if you see any loss of power, it's probably a clogged cat.

 

this is a true statement but stg 2 even on colder days i saw maybe 16 psi 18-20 are unheard of on a stg 2 pulley, trust me guys check your cat, theres a small chance im wrong but most likely ull thank me later.

 

I'm not on a stage 2 pulley.

 

i was talking the first guy, but if you conitinue to see that even on warmer days you may want to check that out. just trying to help you.

 

Mine is defiantly like that in the cold. I know for sure it isnt a clogged cat. It only has 13500 miles.

 

look im not here to argue im just giving you guys some advice take it how you wish.

 

Technically, you are being correct, for them.

For me, i'm doing the 2.8 pulley thing. It's normal for me to see 17-18.

On warmer days, it definately only sees 18psi tops. Mine definately must be with the cold.

And for the record, our cats have clogged at 5000 miles. Some are just ****.

 

completely agree with you there as u can see im on a 2.8 awell but also a high flow cat so...

very true my buddys was fucked at around 8k and all he had was a cai

 

I wasn't accusing you. Sorry if it seemed like I did.

Last winter i would get around 13-14lbs of boost whereas during the summer it would be around 11-12. I definatly believe it's just the cold. Now stage 2 is here I get about 2 more pounds of boost due to the cold.

Regardless isnt there a funny smell you get if your cat is clogged?

 

It's only a matter of time before I rip the downpipe off and gut the cat. I want to shoot flames

Not always.

 

Oh and I forgot to say I'm on sea level altitude. That affects it a tad.

 

i'll check the cat just for the hell of it. I'll let ya know what happens

 

I agree with you. I just question the ability to differentiate between 1-2lbs. using the stock boost gauge.

 

I'll be making an appoitment today with my dealer. This morning leaving work I got on in in 2nd and 3rd. The gauge went way past 20 and pinned itself by the autometer logo!

I also feel the car very sluggish. My cat may have died.

If dealer refuses to warranty it, downpipe is coming off and i'm gutting the cat with a metal rod.

 

I am thinking it is not shitty cats, it is the way our cars run....

A catalytic converter takes HCs and CO (bad for us and atmosphere), and turns them into CO2 and O2, now when it does this chemicle reaction, a lot of heat is produced, making the little honeycomb inside the cat to melt, causing a clogged cat. Our cars run really rich at WOT, so that overworks the cat...

 

This thread just goes to show you that cooling mods help performance just as much as anything else does

 

i hit 17-18psi everyday.....on stage 2, gotta love sea level.... oh and i have a new cat

 

my cat clogged and exploded at around 15K.. so that could definitly be it..