400FWHP TBI build attempt thread

[Fast355]

Thanks for the input. When you say higher RPMs, how high? I'm planning to spin no higher than 5500, limiter set at 5750. I'm feeling like I should have insisted on BBC injectors. I think I'd have fewer concerns and questions.

You are going to have a hard time making 400 hp under 6,000 rpm on a 350 that mild.Pulsewidth to stay under 80% duty cycle goes from 5msec at 5,000 to 4 msec at 6,000. If it takes 500 usec to open the injector and another 250 usec to close you are looking at needing an injector that can get the fuel volume necessary in 3.25 msec. Big injectors are a must for a high hp TBI.