Hey guys, need some Ideas here. Been running well for the past year on this current setup.

Street Ported 13Brew
Haltech E8 ECU
BW s366 .91 (24psi)
1000/1600 fuel injectors
dual Bosch 044 pumps
3.5" exhaust
FMIC

Data logs run every time I drive the car, and this includes fuel pressure. All of a sudden on one of my outings with the car, I am seeing lean conditions right through each boosted pull. On that same outing the first few pulls were fine, but then the all became leaner by .5 - 1afr. WTF? There was no difference on the Fuel coensation tables. I have since driven the car another day to verify that it was not just a one off situation, but the problem persists. I do not want to blow the motor.

Nothing has changed on my tune and logged fuel pressure remaines the same as those on previous logs which have good AFRs. EGT's were about 45*F higher normal in the lean pulls, remains balanced between Front & Rear which would indicate that the problem is not just 1 injector.

I am leaning towards the ECU/software since the fuel system seems intact.

Has anyone ever experienced this?

Any Ideas?

I am leaning towards the ECU

 

Is this the stock fuel tank? Is it just sloshing from not being filled enough?

 

Actually, it is the stock tank, but I don't that is the cause because it had a considerable amount of gas in it. I also did pulls after the inital event and had the same results.

 

I would have thought wideband sensor failure at 1st. but your egts have increased so I would suspect voltage related issue or fuel filter issue. your logs show anything funky with voltage?

 

im having similar problem, i suspect its someting wrong with the fuel pressure regulator. ive already replaced fuel filter with no help. can you log fuel pressure?

 

Guys i think I found the problem. My anternator may be on its way out, and its the one channel I did not choose to log. Looking at the battery voltage while at idle, it looked lower than usual(12.3 usually around 14v) So i deciced to add that channel to the logs and sure enough while reving at standstlll the voltage drops as rpm rises. It dips as low 10.9 volts. This is at standstill so its probably a lot lower while under boost with the fuel pumps all loaded up and the headlights on.

Thanks for the suggestion Rotate86.

 

This also means my battery compensation/injector deadtimes maps are not setup correctly.

 

awesome. that was going to be the next thing I asked. was there voltage compesation on the earlier haltechs. I haven't used there earlier ecus