MSefi.com read only forum (Jan.15,2018)

^^^ Same question here actually, I've got two turbos bolted to mine. Do you have to consider boost? I would imagine you would, as forced induction increases the air flow. If so a large single throttle body like I mentioned would probably suffice (90mm)?

cheers

I was going on power as a factor as well (before I found this thread). I've seen a 300bhp SD1 (same engine as mine) running twin 65mm group A throttle bodies. I used a much simpler formjla by just comparing x-sectional area:

65mm = 3.25cm Radius = 33.24cm2

x2 = 66.48cm2 for 2 65mm throttle bodies ...

Hi,

I've just done the calculation for my engine. I'm running a 3.5litre V8 (215 cu) and used peak rpm as 6,000. I plan on using a single throttle body when I move over to Injection. According to the calculation I need a single throttle body with 20sq.in, which results in a 5" throttle body!

I was ...