I actually ran both sets of injectors on my VE at different times. I had the DE injectors with RR DE ECU/MAF at first and then I switched to the VE injectors with RR DE ECU/MAF. I actually preferred the VE inectors in my set-up. I was happier to see the STFT pulling out fuel with the VE injectors than I was seeing the STFT dumping in fuel with the DE injectors. This is going to be different in every case though and without a way to monitor just how rich/lean you are, you are just pissing in the wind.
Regardless of which injectors you choose to run, anybody doing a swap should be monitoring their AFR's. This is the only true way of knowing, with immediacy anyway, how the car is perfoming. Because all engine set-ups run differently, there is no precise way to know what the AFR's will be in a swapped set-up. Because of variations in the MAF readings, narrowband o2 sensor, injector performance, differences in vaccuum pressures, ability of different ECU's (different years) to pull/add fuel via the STFT, it is hard to compare one set-up to another. VE injectors in one particular set-up might yield mid 12's and low 13's, but in my set-up they might yield high 11's and mid 12's.
I think it all comes back to having a wideband and a clean/proper functioning set-up. I see too many people throwing bolt-ons, cams and whatever else at a new set-up when they haven't even covered the basics. Those basics being, a way to monitor the engines perfomance and a proper and/or professional tune. One should not be spending 1K on cams or $600 on a header when they haven't even spent $175 on a wideband o2 sensor. It just makes no sense. Also, dropping $150-400 (depending) on a dyno session with a tuner is the best way to ensure that your engine is perfoming well and that you are ready to start throwing performance parts at it.
Beyond all of what I've just said and regardless of what your specific set-up is, flogging the engine under sub-par conditions is not a good idea. If you are running the DE injectors and running lean, or the VE injectors and running rich, you should be cognisant of the fact that your engine is running out of it's optimal range and you should therfore be somewhat more restrained in how hard you push it. Both scenarios, DE injectors/ECU on VE engine and VE injectors/DE ECU on VE engine should be stop-gap/temporary at best.
One final thing, if any individual is swapping out injectors at any point in time, make sure to replace the lower injector seals (fuel rail) as well as the lower/upper injector o-rings. Vacuum leaks at the rail, as well as fuel leaks at the injector are not pretty and will definitely cause a rediculously rich condition, especially with the VE inj./DE ECU. Make sure to also use proper lube on the inj. o-rings (vaseline works well) when putting the injectors in the rail. The 2nd last time I was messing around with inj. in the VE rail, I used a small amount of oil on the o-rings and it was not enough and I ended up damaging a set of o-rings. It was not a nice running car.
In summary....wideband o2 before monster street sweeper!
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