Guys driving my car today Ive noticed my boost is not as high as it was tuned. The car was tuned to 27-28psi on cbrd's dyno in about june of this year so the temps were probably in the mid 80's. The weather here is now in the 60's so im just wondering how much does the cooler air affect the boost. The car seems not to hold the boost as long either hits maybe 25psi than drops to 23 pretty quick, where as i remember the car used to hold 27-28psi than slowly drop as the rpm's climbed. Ive checked for any boost leaks and fould no lose clamps or holes in the coupler's. So whats up...

 

Generally cold DRY air will give more boost (which your EBC/Wastegate should keep your targeted), but you will make boost a little quicker, and it will be more efficient over-all.

If your targeting down a full 3psi, you probably need to talk with your tuner for some troubleshooting from the EBC-data-logging side of things. My guess is maybe leaky BOV. Seems to happen with X's around that targeted pressure.

 

Ok put the oem bov "crushed" back on no change! Car runs well just down on boost, I was thinking maybe the ebc is changing the boost too much cause of the cool air.

 

if not the bov or pressure leak elsewhere, time to datalog.

 

If you have a larger I/C installed in colder weather you will get boost drop.

 

This.

Of course always start with the most simple possibilities first. I would check everything you have that's related to boost. Unfortunately, that can be a little bit, but a lot of times it's the small stuff that we overlook that causes the biggest problems.

What kind of EBC do you have?? Did you check all the lines for it? What kind of WGA do you have?

I dunno about that larger I/C dropping boost comment because I have a larger I/C in one of my cars and I'm definitely spiking damn near 30psi as opposed to 28.5 just from the weather change.

 

CBRD frontmount, CBRD 3 port, fp red ported with upgraded wga! I've checked everything else maybe it's time for a roadtrip to York PA again!

 

Usually cars will make more PSI in colder weather, and less it warm. It would make sense if it was backwards, but chances are you have a boost leak, maybe a clamp came loose somewhere on your piping, it happend to me, my car felt sluggish, re did all the clamps, ran great again.

 

I pulled the front bumper and checked all couplers non are loose! Car drives great seems not to be down on power just the boost is down...

 

Just from a concept of thermo and fluiddynamics, I can think of this being true logically.

I mean if the FMIC is big enough, and the temperature drop is big enough, the air would be dryer after going through the compressor, which means the air would really be at its highest density. If the air density goes up, it would take a larger mass of air to fill the huge FMIC, and that would result in a larger pressure drop across the core.


I can't reason it, but I can understand it. One easy way to test. Log your peak pressures on your current setup. Then move your boost gauge from where its at to as close to the compressor as possible. Log your pressures.

 

Guys I'm computer illiterate so I can't log crap! Thats why I drive a pushrod V10...

 

for checking the difference between the pressure the turbo is making, and the pressure the intake manifold is seeing I meant log with pen and paper and looking at your gauge when you punch it :-)

 

Im gonna build a boost leak tester today and check it the right way.

 

 

I am now part of the 21 century! I just flashed my oem tune on my car to confirm that Im capable of doing it. I did check the inj duty cycle on the oem tune and my custom tune to verify that I was indeed changing the tune. Man Im getting good at this stuff...