from the calcs that i did, between 3.5:1 and 3:1 I was basing this off of the stock 235cc injector and the S16G turbo. I run the 310cc injectors and i figured my rise rate was around 4.5:1 . Stock injector rise rate is between 7:1 and 7.5:1, and since you are using an injector almost 2 times a large as stock, you would divide the rise rate in half, which = 3.5:1 or 3:1 I would start off with at least the 3.5:1 ratio, and tune down from there if you can.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)