what size to handle 425whp?

 

550cc min.. I reccomend 680s or better yet, 720s, and tune down, then still have a little more room to play with if your balls get larger....

 

680's

550's max around 350

 

My boy Star was making 460 whp on his boosted B20 Vtec with DSM 450's and had like 11:1 af accross the board....

 

thanks for the info guys!

 

yea right around there, gauge only went to 100psi. it had a rising rate fmu in it.

most injectors are rated to a given horepower with a static fuel pressure of around 45psi and a 1:1 fpr.

if u want to make that much power id say go with 880's. i know mine were at 77% duty cycle at 395whp