11 X5 50i dinan tune, lean under boost

[Hoffmann707]

Hi guys i have a 154k mile 50i , original engine and tranny, everything works good but i noticed when checking my short term fuel trims under boost its adding 15-25 % fuel on bank 2, sometimes 15% on bank 1 but rare, fuel trims are great otherwise, high pressure fuels pumps get up to 2900psi and it seems like its only making 10-13 psi on the dinan stg 2 tune. Its been like this for a very long time and trying to see if this is common for others that are tuned or stock, never seems to throw a fuel trim code. Also noticed the intercooler temp on the driver's side is almost 30 degrees hotter then the passengers

[Sophisticated Redneck]

Originally Posted by Hoffmann707

Hi guys i have a 154k mile 50i , original engine and tranny, everything works good but i noticed when checking my short term fuel trims under boost its adding 15-25 % fuel on bank 2, sometimes 15% on bank 1 but rare, fuel trims are great otherwise, high pressure fuels pumps get up to 2900psi and it seems like its only making 10-13 psi on the dinan stg 2 tune. Its been like this for a very long time and trying to see if this is common for others that are tuned or stock, never seems to throw a fuel trim code. Also noticed the intercooler temp on the driver's side is almost 30 degrees hotter then the passengers

Its common to see trims like this on tunes and there being a slight discrepancy from bank to bank. Drivers side Intercooler always runs hotter on 50i as coolant feed to it runs across entire engine bay over radiator fan. You can add insulation to this line and it will help but there will always be a difference from bank to bank. On the M, BMW added an additional radiator and intercooler pump to address this.

[tomjonesBT33]

Originally Posted by Hoffmann707

Hi guys i have a 154k mile 50i , original engine and tranny, everything works good but i noticed when checking my short term fuel trims under boost its adding 15-25 % fuel on bank 2, sometimes 15% on bank 1 but rare, fuel trims are great otherwise, high pressure fuels pumps get up to 2900psi and it seems like its only making 10-13 psi on the dinan stg 2 tune. Its been like this for a very long time and trying to see if this is common for others that are tuned or stock, never seems to throw a fuel trim code. Also noticed the intercooler temp on the driver's side is almost 30 degrees hotter then the passengers

What tool are you using to monitor fuel trims?