PowerFC Turbo/Injector Downgrade Question

[hstylez]

S14 SR which is currently tuned with a PowerFC D-Jetro (map sensor)for this setup:
GT2871R .86AR
850cc Injectors
Megan SS manifold

I'm switching to the following setup:
S15 Turbo
525cc Injectors (STI)
Stock Manifold

Obviously I will need a tune for this to run well after all the changes. My question is: do you think I can get the car running well enough to drive it(out of boost) to a tuner 100 miles away? If so, what values in the PowerFC can I adjust to correct the injector difference since that is my main concern.


7/6/12 Update: To anyone who ends up searching for this and is curious of the result, the injector scaling worked perfectly and the car runs fine. Simply all I did was scale the injectors based on the new size. New size is 525cc, stock is 370cc. Divide 370 by 525 and you get ~71%. That is the value I used on the PowerFC and the car is running great. Heading to the tuner this weekend for fine tuning.