EvoIXPilot

iTrader: (10)

My car was tuned in OH around 55 degree weather. Idle AFR reading was 14.7 give or take. Now, in this 10F Nebraska weather, I noticed AFR's been leaner..idle around 15.2 or so. I don't notice any boost spikes. However, I think WOT is around high 11's. EBC is set at 11 min 19 max. It was tune at 19. Should I reduce the the boost during the winter? How many psi should take off?

flymx771

iTrader: (33)

Basically cold air is more dense which means there is more oxygen. You need to run more fuel to compensate for that. If I were you I would just run wastegate pressure if you don't plan on getting tuned for the cold weather.

ReaperX

iTrader: (5)

Drop the boost a few psi and you'll be fine. IMO this is why I believe ebcs are far better than ebc/mbc.

asu11

iTrader: (7)

One of the reasons I switched to a 3-port. Still going to get leaner AFRs, but not as much as of you had an mbc and boost was higher.

flymx771

iTrader: (33)

Can't get much better than having complete control of your boost curve. Boost control solenoid+aem ems=tuning wetdream.

asu11

iTrader: (7)

Is this on pump or e85?

EvoIXPilot

iTrader: (10)

No, Midwest 91.

EvoIXPilot

iTrader: (10)

I have the Profec B Spec 2 which seems very difficult to configure. It's not like the EVC simple Hi=19 PSI. I wouldn't know how to lower pressure. The tuner set the low boost to 11 PSI. Would dropping down from 19 to 11 be destructive to my engine?

asu11

iTrader: (7)

Do yourself and get tuned with Ecu flash. Dropping just boost itself will not damage your engine.

EvoIXPilot

iTrader: (10)

Also, during cold start, I noticed the AFR jumps between 15-15.8 and everything in between and three times, it jumped to 16 for a split second. All this within 15 mins. Once the car is warm up, it still bounce between 14.9-15.6, no 16s. Searching, everyone says during warm up, you run richer. Should I be concern? Is this due to the cold?

asu11

iTrader: (7)

That's normal.