Biggest injectors he wants? Interesting notion.

There are thresholds at which injectors like to operate and artificially trying to compensate for oversized injectors is something you do when A: you can't afford the right set of injectors or B: You are the kind of guy who wants to stretch the limits of his ecu, the patience of his tuner and enjoys part throttle and idle headaches.

Albeit safer than trying to squeeze more out of undersized injectors, trying to reduce the duty cycle down by more than 20 percent above or below a reasonable 80 percent duty cycle is not wise and not keeping with a build that otherwise seems to be well thought out.

How much are these injectors being pinched? Difficult to say, but he's only putting down 175 hp. He says his a/f is good and if so, approximately 25 lbs of fuel per hr is needed to produce that output. 525cc injectors put out double that, at around 50 lbs per hr. Its about the same size factory injector used on a twin turbo supra.

Also, regarding the tuning of the ecu: in this case being tuned "correctly," applies only in the broadest sense of the word. The ecu is being instructed to do the incorrect thing to achieve a correct (or as close to correct as you can get) result.

My original point was to remove variables that only complicate troubleshooting the problem. Fidgeting with poorly mathced parts to try and make them do the job of the right part only muddies the waters and keep you guessing longer.

If running oversized injectors is as easy as getting a tuner who = Japanese Domestic Market (whatever that means), there would be no need for long-established formulas to properly select injector size or even the need for so many sizes. Just buy big and dial them down.

Call Russ over at RC and tell him you want to make 200 N/A hp and see what comes on the UPS truck. Hint, it won't be anything close to 500cc injectors.