I ran my stock injectors to 119.5% IDC before they became uncontrollable. I like to consider 115% to be the safe limit for stock injectors. People do need to remember that 100% IDC as shown by EvoScan isn't a true 100% IDC.

 

Just to add some info to the thread...if you are on a stock turbo on pump gas, you *shouldn't* need bigger injectors. Mitsu picked that size to be able to cover a maxed out stock turbo (roughly 43lb/min).

If you do the math, it comes out to around 12:1 AFR. Of course, not perfectly ideal, but that is absolutely maxed out, which is pretty difficult to get on pump gas and if so, only will be for the brief period of time at max airflow near max RPM.

Of course, I'm not saying not to upgrade your injectors. Just pointing out a few facts for consideration when thinking about duty cycles and their validity.

 

Im currently running @ ~ 105 - 109%, @ 25psi / 39lbs./min. and still have control. Ive hit 110% a few times and still ok. From what Ive gathered, w/ all of the knowledge being shared, this is pushing it enough tho. (my abesolute max, I wanna see) Inj. are next on the list for me...

 

That is correct 115% is the area where they start to get funny but I have seen it as low as 108% with 113% being the average. I would assume that it depends on pump age and filter health.