So here goes... 2 weeks ago it was discovered that i had a bad boost leak. Ive had the leak for a long time but after a drag launch using the 2 step it blew it open really good. The car was tuned by Japtrix with this boost leak ( they had no idea it was there/nor I ).
The car threw a system rich code 2 weeks after the tune when the boost leak got bad. I took the car to mitsu and they fixed the leak.(also replaced 02 sensor) After fixing the leak however... the car began to run lean (13.1 peak a/f) on 21 lbs of boost. Japtrix left me high and dry B/C of an issue with one of their tuners (Jack). We dont really like each other. SOOOOO... now im left to deal. I had the car tuned by Billet Design a while back and loaded that flash. Its still in the mid 12's. When I had this flash in B4 it ran 10.5-11. Am i doing something wrong... nothing has really changed since the last time i ran the billet flash other than im running 21lbs instead of 19-20lbs.

 

Bump

 

bumpity bump

 

lower the boost until you can get retuned by someone else.

 

ok... temp fix.. im looking for something a little more specific... like why did this happen... and why is the old tune not working anymore?

 

bump for some help

 

2 more psi will result in leaner AFR. Remember, that's 10% increase in pressure. 10.5 - 11 is slightly on the richer side, so you could drop 1 psi and probably be right on, until a tune. Air filter changed to higher flow? Disconnect the battery and reset the trims. Then see what it says.

 

i set my EBC to low boost (17lbs.) Reset the ecu and nothing high 12's low 13's.

 

Sounds like you need to have the ECU retuned by someone else. Im not sure why it happend really, but it needs to be reflashed. There is nothing else you can do really.

 

well... ive got all the cables i need to hook up the AEM to evoscan.... ive got some help with the tuning... ill let you guys know... any additional help would be appreciated

 

Good luck

 

hey ralph...ive got some questions about the cable im to make...
im on AIM if you can talk...

 

You may be hitting higher load cells that weren't touched in the previous tune.

 

did you ever think that the replacement of the o2 sensor might have something to do with it?? Dosnt the stock ecu respond to input from the 02 sensor ? yes or no? If so then possibly the feedback from the sensor could be different creating a different runing condition?

I really dont know the stock ecu's approach as to how it adjust for fuel. Weather it takes in maf and o2 sensor input or just maf flow and then its corresponding load cells.

Just something to think about maybe

 

I am not sure which car this is? As a couple of suggestions, I would check the o2, wide band o2 (it can be innacurate), and fuel pump (delivery problem?) You can check a plug after a pull to see if it is lean for sure or have someone look at the exhaust to see if a little black smoke comes out under a pull. Those are just a couple easy ways to check but i would suggest not making so many pulls if something is really wrong.