...Ok I am working on an Excell spread sheet, it works for TBI.
I want to add the caculations so that it works for TPI too.
A stock 350 TPI has 22# injectors x 8 at 43.5 psi so whats the BPW.

Here's what it looks like (I'm not posting it till it's right)

 

For TPI it depends upon the injector firing rate. If fired at the same rate as a TBI setup the formula is:

bpc = 365.375 * (VOL/RATE)

If the injectors are fired once per revolution (stock TPI rate) the formula is:

bpc = 730.75 * (VOL/RATE)

RBob.

 

Thank you Sir........

 

So......a stock 350 tpi running 22#inj @ 43.5 psi would have a BPC of 24.26?
Is that good or is it off?

 

I'm getting 189 for the BPC.

189 = 730.75 * (0.7170625 / 2.77)

The rate is the injector flow in grams of fuel per second
The vol is the volume of 1 cylinder in liters

RBob.