which is why i'm deeply interested how these perform. I live in an area with a ton of tight roads and highway, but my main drive is tight until i reach the thru-way. I want something that is going to respond ideally in those situations.I've not seen any on kill yet, but these are done more with response/track in mind than drag racing so instead of the max power per mm of inducer the wheel design etc is more aimed at managing shaft speed versus flow etc to keep the turbine wheel intact and the turbo responsive. They DO flow a lot but the target will be response vs flow as opposed to flow vs mm, I'd imagine you'd realise that less mm for flow does not necessarily equate to better response.
If I were a betting man, I would treat a 74mm EFR like an entirely smaller turbo than a 72-76mm Precision - both in terms of flow and very much so in response. Fwiw Vibrant Performance recently set a new record for FWD Time Attack cars at Tsukuba with their Civic running an EFR9280 at "Over 1000hp" and shared a log showing them pulling out of a tight corner from mid-3000rpm range during the record setting lap. Not many turbos capable of a legit 1000+hp will do that on a 4pot without nitrous, and certainly not something you'd expect from a G42 or 72+mm Precision donk. Or really even one around 67-68mm.
Someone really needs to do an apples to apples comparison. With a manifold that can accomodate all these turbos. I'd pitch $$ towards that data.
6266, 6466, 6766, 6870/5, 7175
gtx3582, gtx3584RS, G42-1200
All on a stock motor Supra. With proper supporting mods and a nice standalone.
HELL I'll even volunteer my supra for it! For the good of the community.