97 miata megasquirt 640cc injectors
 

As I am trying to build my car on a budget i recently put 640cc injectors now runs lean after a few minutes idleing. I can find no vacuum leaks. Does anybody have a megasquirt map with similar mods? I am trying to avoid paying the dyno tuner to fix my fuel map then charge me again when my turbo is installed. Any help would be greatly appreciated.

You're gonna need to tune the car to account for the injector change.

Req Fuel Calc + Deadtime table + Retune your VE table at the minimum

It really isn't all that hard to keep it idling, when your car is warmed up. I hope you have a wideband and registered tunerstudio!

First turn off acceleration enrichment and all ego control, that makes life way easier.

If it idles lean/rich or starts to go up and down in rpm, just select a few cells around your typical idle rpm/map and set them to one value,
so it runs at around 14:1 afr for the start. You can also lock these cells, if you want.
Attention!: Do not autotune idle cells or very low load cells, it does stupid things there, like pulling too much fuel.
Up the value if it runs lean, lower it, when it runs rich.

Post your msq and report back!