DrivenSolo88

just leave it stock boost. Its made to run that way from the factory. Besides if you put intake, exhaust on ur car and its a little cool outside u will spike a bit any ways to make up for it being over rich from the factory.

vetboss

iTrader: (2)

I do agree, unless he's gonna get tuned, then it would be silly to stay at stock levels. Its a must to go bigger on the boost full time without any taper after the tune, unless he's out for better MPG.

Stock peaks around 19 and then tapers to like 15-16ish

06GraphiteEvoIX

That is basically why i turned it down... when it was getting like 25 degree's here i notice i went from 21-22 peak to 25 peak... so i turned it down a couple and then it got closer to the 10 degrees and it jumped right back up so i turned it down alot and got it to around 15 MAX! and it still gets up and goes just fine but it is not like whiplash quick!

I put it away for the winter cause snow is way bad here and i dont trust other people but i will defintily turn it back up when i pull it out.... It is like getting a brand new evo every spring if you know what i mean! Except the winter part is so slow cause you cant wait to pull it out cause that is when i buy all my mods and put them while it sits in the garage. I hate waiting to take it out and see what it can do, Even if i did pull it out i cant go anywhere.... to much DAMN snow!

buchnerj

iTrader: (19)

Yes, the boost will increase with the cold weather outside, but down a few pounds should solve that issue. I hope it isn't boosting more than needed and faster than it should or you could have a possible boost creep issue in your charging system. I support safety during the winter months, but if you do that during the summer then you are taking it to an extreme IMO. However, it is your car, be safe and have fun!

FJF

iTrader: (18)

The boost variance you're seeing is most likely due the cold temps altering the response of the spring inside the MBC. If it isn't installed as such, you may want to mount your MBC to something that comes up to temp with the engine, like the radiator. Too, I hope you're not boosting before your oil (not water) is up to temp. FWIW, I'm running a Hallman MBC and seeing +/- 0.5PSI peaks from 30-90F.

soceur77

iTrader: (2)

+1

convict0807

iTrader: (4)

i ride around at 27.5 and dont touch it....thats what i was tuned for...

19DB794

iTrader: (33)

25 but I try not to hit full boost lol.

4WS Tuning

iTrader: (73)

Right on target... This is the correct answer... Your tuner will decide what is safe for your car based on how you drive, where you drive, fuel and modifications.

If your tuner doesn't ask how the cars driven then he's not doing his job. Knowing the driver is just as important as knowing the car.

Cheers!

bman4123

I run 27 psi all day until i get a new ignition which then i will be running 30-31 psi

!EVIL EVO VIII!

iTrader: (3)

in the winter i turn mine down to about 19 but in the spring/summer i turn it back up to 29. its pretty much up to you. i just wouldnt turn it down to low or to high for that matter lol.

WAIRONWORKER

iTrader: (6)

Thats pretty much enough said right there. I am tuned for 26 psi and i use it when i need it.

biggieevoIX

iTrader: (2)

23 psi daily on 91 pump gas

Jarrett 03

iTrader: (34)

31 all day

mifesto

iTrader: (58)

you may be mixing up open and closed loop operation. on high load/boost your ecu relies primarily on your fuel maps, not your maf. ecu is only "smart" during low load operation(idle or cruise) which just adjusts for 14.7 afr using maf signal primarily. turning down your boost to 15 psi when your tuned for low 20's means your running very rich up top. if you see the same afr ratio regardless of psi means maybe your wideband may need calibration.