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Injector duty cycle is a function of airflow. The turbo's ability to move air through the engine is a function of the modifications. A normal TD05-16G on a completely stock engine with stock exhaust and intake will be fine on wastegate boost.

I am running a ported & polished TD05-16G which will flow more air, and had a modified intake and 3" TBE and ran just below fuel cut on a stock engine without any problems. AFR's stayed around 10.5-11 to 1, which is normal for the stock ECU. You should be fine.

Sorry to jump in here, but I can just put 25D heads on my stock 22T short block w/Robtuned ecu? How about with a 22T ecu? That would be pretty cool since I can find 25D heads a lot easier than 20G heads. Of course it would be easier to just use my stock 22T heads since I am not looking for crazy hp.

No, the 25D heads would alter CR, and the ej22t intake manifold will not bolt up to those heads.

Check out these threads for more info.

http://bbs.legacycentral.org/viewtopic.php?t=38247
http://bbs.legacycentral.org/viewtopic.php?f=5&t=49579