SSBalt

At this rate I might be boostless at -5!! And yes...I need a tune

WaRRioR-StaTuS

I was driving yesterday and was trying to watch my boost guage when shifting, seems I am still around 15 and my temp was way below freezing yesterday with a wind chill of like COLD lol but your still making 260/260 so its all good right? lol

vB00STw

So you're saying that because of the temperature, he is running less boost but the same amount of HP right?

WaRRioR-StaTuS

well he said he does not have a tune so I believe the learn down feature will still be in effect so then yeah, if I understand correctly. Thats why I put a question mark after because i was kinda asking if that is correct.

07LaserBlueSS

Yea the computer is programmed to run less or more boost to make that 260 hp 260 tq no matter what.

WaRRioR-StaTuS

thats what I thought, thanks for clearing it up

1WhiteSSTC

lol i was running approx 8psi the other night, it's in KPa and I was busy keepin the car on the icy roads but i glanced up once to look at it was about 60-80Kpa at best, maybe lower lol

Rodimus_Prime

iTrader: (3)

Talk about a buzzkill

cereal83

I only go to about 60 kpa which is 8 PSI and it was -19 this morning.

bootymac

obviously..... ohh and nice GLI i have one to but im selling it to get an ss/tc .

if only GM didnt have the learn down function youd be boosting at 15 and be so much faster. I guess that kinda is a good thing though considering that there would be more "snow took another victim" threads.

MaxVQ35DE

id be taking it easy on your car when its frigid... I try to stay out of boost entirely....i mangled a syncro on a brisk shift in my WRX with an ambient temp of -1 degrees. make extra careful shifts, and watch out for axle hop, everything is more brittle in the cold.

emiller

I saw 12 psi last week. At first I thought I read it wrong but it was by far the coldest temps of the winter so far. It was 1F outside.

El_diablos_SS/TC

Not to one up someone but it was -10 last week and I saw only 9 psi and yesterday as I was leaving my second job I floored it and bearly touched 5 psi. I was thinking the same thing. "Am I really getting 260hp off of 5 psi??"

emiller

You can have your -10. 1 was cold enough for me lol.

Cold air is denser so more air fits in the same volume. Its the ideal gas law.
Pi Vi / Ti = Pf Vf / Tf
Pi = Initial absolute pressure (kPa), 230kPa ~ 33 psi
Vi = Initial volume (L), this doesn't change and is fixed ignore it
Ti = Initial temperature (K), 300K ~ 80F
Pf = Final absolute pressure (kPa)
Vf = Final volume, same as Vi
Tf = Final temperature (K), 250K ~ -10F

Pf = (Pi x Tf) / Ti = (230 x 250) / 300 ~ 192 kPa ~ 27.8 psia - 14.7 psi ~ 13.1 psig

I estimated and rounded the numbers but it should be close. Also you don't get full boost until the engine is warmed up.

Terminator2

That says a lot for how efficient the LNF is, but just imagine how much power you will make at that temperature when you are tuned at 22 psi.

SSBalt

Thought the same thing. It did feel like the car was doggish though.. But it was probably just me looking at the gauge and thinking 7psi = slow.

sheldon729

I dont see why ur having trouble with you boost at colder temps... Its been -40 degree celcius and i still hit 110kpa right around that 15psi