I had my tune in for 4 weeks and the car ran great boost was hitting 21psi, AFR looked good.
Then we started getting rain and foggy days and it would only boost to 7psi with small bursts to 14. So I came home did a log file on it. Then loaded the stock tune in and boost was consistent at 15 psi. A few days later loaded the other tune in and it ran good again until it was wet out again. What could be causing this. I have a log of it happening and a log of my stock tune they were taken as soon as I could load the tunes (so within minutes of each other) on a wet foggy day.

I figure it must be something with the tune. As I have no issues on the stock tuning.

It is an HPT tune

 

3 bar sensors in car?

 

Engine is stock except Filter and ZZP catted DP. Ops my bad I just noticed I typed 23 so I changed it to 21. Shouldnt need a 3 bar for 21 and below. But like I said it fine unless its wet out.

 

I've heard about the connections on the 3 bar becoming compromised in wet conditions. But if you do not have them it wouldn't apply. Hopefully someone can chime in. Only other advice I could give really is send the logs to your tuner and see if he sees anything unusual. Myself I've never had any issues in inclimate weather. I am HP tuned as well.

 

What do your AFR's look like?

 

dang that's a weird scenario. maybe you're spinning so much you can't put enough load on the engine to build full boost

jk
in all seriousness i don't know, i would definitely send those logs to your tuner though my friend.

 

General average cruising is 14.7 ish. WOT is about 12.8 to 13.2

Dont really see a changes when the issue is happening the afr is pretty much the same.

I sent logs to the tuner and a few text messages on Nov 7th and one each day since and havent heard anything from him.

 

Curious, are you knocking at all?

 

Weird indeed. Because of my altitude, I'd boost 18psi on stock tune (Not GMS1) sometimes it'd get to 20psi. So I was thinking it was learn down, but it appears this isn't the case.

Whos your tuner if you don't mind me asking

 

At high RPM over 5000 only 1 or 2 on HPT logs