shaunditty
Shaunditty
My truck seems to be going lean on longer pulls. It runs great overall. No issues.
I have a Autometer wideband, fuel pressure and boost gauges in the truck that I watch. It all seemed to start last year. So I put a new FMU and Walbro 255 in-line in it. It does it on either tank. When I first put a supercharger on it a few years ago I put a Powerdyne on it and the AFR gauge would read 10.5-10.9 during a entire run and I even attempted to put a 10:1 FMU disk to lean that out and it didn’t change much. I put a Vortech in it with a 3.15 pullley and it seemed good at first. I wanted to turn it up so I put a 2.85” on it and was seeing 10-11lbs boost. I noticed it being slightly lean then. What it does is from a dig the AFR starts off at 10.9 and fuel pressure is 100+.. boost is the highest at lower gears and as i go deeper into the run my AFR gauge will start creeping up to 12.5-12.9 so I let out. The fuel pressure is still 100Psi+ though.. that’s the highest my gauge will read. So I put a 3.125” on it which is around 8psi boost and it’s still going lean at the top of the pull. I’ve thrown a lot at my truck lately too. I deleted all the smog and EGR stuff. I put 1-5/8” long tubes and I hacked together my own 2.5” dual exhaust. I drove it today and man it runs good and everything seems good. I can feel a difference in the power increase from the recent changes I made. I just wonder why it’s leaning out up top like it is and what I need to do to fix it. I know it sounds crazy but every since I put the Tial BOV in it and removed the Bosch valve is when this seemed to start happening. Unfortunately I sold that setup and can’t switch back for testing purposes.
I have a Autometer wideband, fuel pressure and boost gauges in the truck that I watch. It all seemed to start last year. So I put a new FMU and Walbro 255 in-line in it. It does it on either tank. When I first put a supercharger on it a few years ago I put a Powerdyne on it and the AFR gauge would read 10.5-10.9 during a entire run and I even attempted to put a 10:1 FMU disk to lean that out and it didn’t change much. I put a Vortech in it with a 3.15 pullley and it seemed good at first. I wanted to turn it up so I put a 2.85” on it and was seeing 10-11lbs boost. I noticed it being slightly lean then. What it does is from a dig the AFR starts off at 10.9 and fuel pressure is 100+.. boost is the highest at lower gears and as i go deeper into the run my AFR gauge will start creeping up to 12.5-12.9 so I let out. The fuel pressure is still 100Psi+ though.. that’s the highest my gauge will read. So I put a 3.125” on it which is around 8psi boost and it’s still going lean at the top of the pull. I’ve thrown a lot at my truck lately too. I deleted all the smog and EGR stuff. I put 1-5/8” long tubes and I hacked together my own 2.5” dual exhaust. I drove it today and man it runs good and everything seems good. I can feel a difference in the power increase from the recent changes I made. I just wonder why it’s leaning out up top like it is and what I need to do to fix it. I know it sounds crazy but every since I put the Tial BOV in it and removed the Bosch valve is when this seemed to start happening. Unfortunately I sold that setup and can’t switch back for testing purposes.