Hi, I have a b20v and NA makes about 250-260whp on pump E85. I want to add a 100-150 direct injection dry hit of nitrous to the mix with S300.

I'm currently on 725cc ID with a Walbro 255. Can somone recommend what size ID I should move up to? What about fuel delivery? In tank pump if I have to change would be preferred.

Thanks.

 

i always like using a 450 off the bat. mite beable to use your injectors with uping the pump to a 450 depending on how much base fuel psi you have and what duty cycle your at.

 

if the walbro 255 is a genuine walbro (there's lots of knockoffs out there), it should be able to support up to 400hp no problem.

as said above, those injectors should be capable with a bump in base pressure. I'd say 50psi base pressure should do the trick, though it will obviously require a full re-tuning of the fuel maps. a global fuel change will not suffice.

if you're set on changing injectors to make sure you're good, 1000's will definitely support your goals.