Not sure if this has been answered before so ill go ahead and ask. If it has could someone send me to the thread?

Well I got my car tuned in about 100 degree temps. Runs fine during summer days and what not.

Problem I am having is when the air is cooler outside/more dense, I am getting some knock and lean afrs ~13.0 wot full boost. My question is how do you tune around this? Do you richen up your tune when you tune it in warmer weather or do you make the colder weather tune targets and run richer during hotter days. What would be the best way to work around this?

Also would a 3 port be better for boost management than a mbc? Is there anything else I can do? I do not think there is any compensation values in the ECU for air temps and density but if there is please let me know.

Thanks for any input on this subject guys!

 

Bump...

 

Update:

I got re-tuned for cooler weather temps and still get a big fluctuation of afrs from day to night. Its running very lean and knocking at night. Given it can be down to 40 at night and up to 70 in the day. I also now have a 3-port installed to keep boost at target.

Can anyone inform me on how to keep your tune inline with atmospheric changes?

 

Compensation tables

Generally when i made a tune and convinced myself that its perfect, from that point, i will never change the values *(unless mechanical changes of the car) due to environment differences. I start to fix the numbers via comp tables.

In 1 year and over 100 correction, the ecu program became rock solid in almost every condition, but as u see that require 3D. Desire, dediation and discipline...

 

Try something like this - it works for me. Remember that you will have to tune the bottom row this table to suit your own needs, then blend it up for 2 rows. I originally tuned at 20C (MAF temp) and 100 kPa (Baro) which is why column 2 is all 1s. I tuned column 1 for winter down to -5C, then 3 for summer up to 40C.

 

Changing to hotter plugs always works better than ecus mind at winter.. im using NGK BR9 at spring/summer/autumn and now 8.

 

He drives an Evo 9 which the recommended spark plug for pretty much all applications is the factory plug.