Is anyone familiar with the math involved in sizing twin turbos. I understand it for the most part, however im not sure how to figure out the air flowd by two turbos in cfm, or how to map the airflow for my motor on a turbo map, for one of two turbos.
Is there a seperate equation i need?
has anyone done this before?

 

give me the details of your motor
cubic inches, rpm your planning to spin, cam, etc.

I'm not too familiar mapping for twins, but, i always hear the math was to find out how much CFM you needed at a given pressure ratio, and than divide by two. Doesnt seem too complicated. Ive mapped out a lot for single turbos

 

X2 on your motor.

 

Pretty much take the two turbos and add their flow numbers. Tell us more about your setup.

 

Its a 383 lt1, ported trickflow heads, 8.5:1, about .57x lift, 22x duration @.050
Im looking to make roughly 600 to 650 hp, but i dont really wanna rev past 6500.

 

your going to need probably 87-93 CFM at around 6,000 RPM.

So, find a turbo that will support 45 CFM at 2.02 PR on the graph, and buy two of them and you should be good.

2.02 PR is 15 PSI for the record.