Beak O Boost
Junior Member
- Joined
- Feb 9, 2020
- Posts
- 12
- Reaction score
- 1
I have been running this setup for about 5 years now and over the winter I decided to geive it some upgrades. I installed a forged 4.75 stroker kit, ford racing intake, comp cams phaser limiter kit, upgraded valve springs, new ati damper, new level ten 5r55s transmission with 4400 triple disc stall converter. Under boost it goes super lean. I was hoping to make at least 14 to 15psi boost but now I can only run the 5psi spring. If I go for more boost it goes so lean it basically cuts out. My wideband is showing 16 to 1 at 5psi. I dont hold it there I jsut watch it spike. I have a gt 500 pump kit with duetchworks pumps. The fuel pressure holds around 38 psi and pumps are running at 26%. I replaced the maf with a hpx e maf and no change. My tuner is at a loss. When your not in boost a tune change can be seen on my wideband but under boost it doesnt seem to change. We are adding almost 50% more fuel at wot than it should have. Maf tables were updated when maf was replaced. Last year i could run 10psi boost without issues. What could be going wrong.