Quote:
Originally Posted by 2023_ZL1-AUTO
Not to take over, but it was mentioned above... I get the purist method, but why is it that DI only vs DI and Port combo is preferred. Sure port has more working parts, but if the end results are equal or close etc. Is it just a preference from maintenance, less parts involved and less tuning since you are only tuning the ECU with DI only vs ECU and Reflex or Atlas ? I'm just curious since I'm all in on DI and Port combo. Thanks!
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If you can deliver the fuel you need for the power range you're looking for with DI alone, DI will have the advantage. DI is more resistant to knock, atomizes better in the chamber(very loose way of saying complicated things), doesn't displace incoming air like port and cools the combustion chamber better...amongst other things. Bottom line is mod vs mod, DI only will make more power than DI + port or port alone.
That said, DI only isn't always the answer. It does have its limits. It's easier to stretch power past the 1000whp mark by adding port. The additional fuel overhead that you gain can be applied to adding more power/boost, there fore technically negating the DI advantage. So my comment was that if you can make the power you want with DI only, its often the better choice, IMO, for multiple reasons. Having tuned Reflex port setups and ATLAS port setups...90% of the time the ATLAS setup is easier to tune. You can't go wrong with either setup, especially if you use the wideband closed loop option. But if I were to pick which I'd rather tune, I would pick the ATLAS since you don't have to get into revising the torque model like you would with Reflex.