Want to build costom turbo kit. Need advice from boosted guys!

[Parmas]

Originally Posted by pimp my yaris

Oh ya. On my first start up the car would barely run. My wide band was pegged at 10:1. Most of my new fuel map is pulling duty cycle back with negative percentages. I am running positive percentages in high boost. The FIC actually zeros out (no intervention) at about 2 psi of boost. At idle its negative 27%

I think you must precise more this post when saying " I am running positive percentages in high boost". How much positive and how much boost?

Running low AFRs are not very good to the engine. Excess fuel tend to mix with engine oil and you can see it dirty after 2 runs already. Running dirty oil mixed with fuel tend to make flash marks on the cylinder bores due too low lubrication to the piston rings. Also turbo bearings tend to fail earlier because of this. I am mentioning this from experience so prevent running the engine like this.

Do you have an upgraded fuel pressure regulator? With the regulator you can reduce fuel pressure and equalizing fuel ratios (although I don't know how the stock ecu reacts having it installed)