Well awhile ago I did some tuning with the sc setup, and closed loop was disabled and accidentaly left that way, then my tuning guy moved. So Ive been driving for a little while without closed loop which of course blows the bank 1 o2 sensor, I was ok with this as I was just dumping fuel and running rich but not leaning out. Now Im turbo, and it still ran the same as with the sc just a little more lean. One day I was playing with an mbc which I just spliced into my wg vacume line, and since then it Ive been having a problem.
The car runs very rich while cruising(below 11afr on the aem uego) and when I let off the throttle at highway cruising it goes very lean(16+afr) unless I brake hard to get the rpms down or stay on the throttle and slowly decrease. But if I suddenly let off the throttle at say 3500rpms at highway speeds it goes very lean. It also does this after getting on it a bit which realy scares me even with me off the throttle. At wot my afr is good though, right around 11.5, but then if I let off it will jump right up.
Could this just be the wb sensor has gone bad? Or could I have damaged one of my injectors somehow by playing with the boost settings a bit? Im running lsj 378cc injectors on 7psi with a modified version of the sc flash. I know I know I need a retune, but Ill be upgrading to 440cc injectors soon and getting retuned.
John Higgins wrote:Sounds normal.
Except for the cruising AFRs of below 11:1. Your plan of upgrading injectors and a complete retune sounds like a wise plan of action.
When you let off the gas sharply the AFR should go lean like 16 or even to where it can't read that lean and you get the - - - briefly. The reason is under compression braking your engine is drawing in more air than you are telling it to squirt fuel for. As long as you are under 12.0 AFR before you see boost again when you step on the gas you should be fine.
FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!
oldskool wrote:John Higgins wrote:Sounds normal.
Except for the cruising AFRs of below 11:1. Your plan of upgrading injectors and a complete retune sounds like a wise plan of action.
He is running in open loop all the time which means the car is running off the VE tables, so if it was tuned for 11:1 it is going to run that in cruising while in open loop.
FU Tuning
Alright thanks guys, just wasnt sure cause it never did that until then realy. And yea I realy need to get a new tune and atleast get closed loop back lol.
