Originally Posted by zoomnick
what do you think is more achievable?
Well, if you're lucky you might be able to get it to idle.
Seriously. A Walbro 255 and 460cc injectors, with an EMB?
Ok, so no first-hand experience on the Walbro, but a lot of folks have reported that the 255 flows more fuel than the factory FPR can effectively bypass, causing a pressure rise on the fual rail which translates to too much fuel when not in boost.
The one I do have first-hand experience with is trying to run huge injectors with an EMB. (Well, I emulated it with my EMU for kicks one day.) The EMB just doesn't have enough range to work with on the AFM signal to control those suckers at the lower-end of the load chart.
You've got two avenues that I can see to salvage the system:
1: Ditch the 255 and replace it with a 195HP. Sell or trade the 460's for some 300-330cc injectors.
2: Ditch the 255 and go back to the stock fuel pump. Sell the EMB and the AFPR and buy either a megasquirt or an EMU.