hey how about we talk some throttle body sizes here so we can set the record straight about what size is needed when on an NA car?
on a stock car, MAF flows 800 kg/hr or so @ WOT
so 800 kg/hr after conversion = 375 cfm... that shows that a 55mm t-body would be okay..
so, another sample is that a 300rwhp 302/306 will usually run a pro-m MAF, and will likely have max maf readings of around 1100 cfm, = 525 cfm.. so on a heads/cam/intake car a 60mm t-body would be JUST joked a bit.. 65mm would be optimal
in my case, a 393, w/ 450rwhp or so (hopefully?) will use a 83mm pro-m and hit max flow of around 1400-1500 kg/hr = 675 cfm, that means a bbk 70mm t-body should work just fine..
but, these are @ WOT, if you want more air to go through at part throttle you get a bigger t-body, hence why most equations add about 5 mm to the bore to gain that extra bit of "seat of the pants" feel...
So, use these #'s and add 5mm to get your optimal t-body..
sound like a science?? comments??
on a stock car, MAF flows 800 kg/hr or so @ WOT
so 800 kg/hr after conversion = 375 cfm... that shows that a 55mm t-body would be okay..
so, another sample is that a 300rwhp 302/306 will usually run a pro-m MAF, and will likely have max maf readings of around 1100 cfm, = 525 cfm.. so on a heads/cam/intake car a 60mm t-body would be JUST joked a bit.. 65mm would be optimal
in my case, a 393, w/ 450rwhp or so (hopefully?) will use a 83mm pro-m and hit max flow of around 1400-1500 kg/hr = 675 cfm, that means a bbk 70mm t-body should work just fine..
but, these are @ WOT, if you want more air to go through at part throttle you get a bigger t-body, hence why most equations add about 5 mm to the bore to gain that extra bit of "seat of the pants" feel...
So, use these #'s and add 5mm to get your optimal t-body..
sound like a science?? comments??