Fueling for Pure Stage 2 Turbos

[Dieselboy]

What are the recommended preemptive fueling upgrades for N54 Pure Stage 2 Hi-Flow 2" inlet turbos? My power goals are in the 600-700WHP range.

The plan is to replace the LPFP with the Fuel-It stage 2 system and to run a mixture of E85 (I've read 70% E85 is the max the stock HPFP and DI can handle) with 93oct. I'd preferably want to avoid PI/Meth at this time. Are my power goals achievable assuming the HPFP is in good working order?

Supporting mods, relocation inlets, etc are/will be installed.

[ErvGotti]

You'll need either the helix overdrive kit or the vargas double shotgun kit on top of the stage 2 LPFP to get you there. I haven't done much research on either kit so do your own due diligence. You will not be able to achieve above 550 whp without the kits or PI, probably closer to 520 whp before running into lean issues.

[Dieselboy]

Originally Posted by ErvGotti

You'll need either the helix overdrive kit or the vargas double shotgun kit on top of the stage 2 LPFP to get you there. I haven't done much research on either kit so do your own due diligence. You will not be able to achieve above 550 whp without the kits or PI, probably closer to 520 whp before running into lean issues.

Thanks.

I've seen a few opinions on the subject and it seems there's going to be some car-car variability. My car is fairly low mileage at 45k.

Originally Posted by ShocknAwe

Other way to think about it is that the stock N54 HPFP setup can handle high content E mixes power output up to 550whp with a walbro450 in line behind it. This is the bleeding edge with ethanol.

BUT, here's the catcher... If you get the proper setup and run 93 only (10% E) you can get ~620-650whp before the HPFP starts crashing on DI ONLY PUMP GAS!

It seems with the right mixture >600whp is possible on the stock HPFP, but I do like the planetary gearbox add-on option from SPOOL. It seems to be the most simple and robust solution.

Port Injection + controllers in my opinion is just more to go wrong or break. Any solution that utilizes the stock HPFP or an upgraded HPFP seems like the best option.