Can I just fit an adjustable fuel pressure regulator and turn pressure up to 3.5 bar or does the car need mapped for it.

Its just im trying to get more out of the 440's, until I have funds for bigger injectors.

 

Yes you can, but all you will achieve is that it will run rich (good if it's lean already...)

An AFR gauge, will allow you to keep an eye on things.

To benefit from any mods (e.g. turning the boost up), the map may need adjusting.

imho

dunx

P.S. Mines at 4 bar static now ! And 94% IDC

 

i did that, but connected my vac pipe aswell. bore washed a cylinder, rings siezed in piston and now i need a liner. so when i put it back together im gonna get it professionally set up to correct pressure.