Do you have a part number for those colder plugs?Looking good! Couple suggestions --- Manic usually recommends NGK 1422 plugs (heat range "8"), one heat range cooler than OEM's "7". When going over 300 WHP, you might consider heat range "9" plugs. Also, I don't see WMI as one of your mods. With all your head work, this is the best time to add WMI --- keep things clean and cooler while adding a bit more power. An 80 - 20 mix and added jets at each port bought me about 20 more WHP, compared to a 50 - 50 mix and only one jet in the ICI pipe.
Any chance you could post comparison specs for the fuel injectors --- your new ones and OEM? I've seen a few recommendations from experienced builders saying OEM FI isn't good enough for over 300HP, but they don't suggest a replacement part number. I'm well over 300WHP, right at 400ft-lbs torque, and still using OEM fuel system but starting to think about improvements. What are the symptoms indicating FI's are too small?
Water-Meth is definitely going to come in the future, but for now I wanted to make "stand alone" reliable power only with the DI.
As for the injectors, i only know what I read on the internet, many as well as the Peugeot fraction claim that the stock injectors have to stay open all the time over 300 hp because they reach max flow capacity.
The gm injectors have been documented by Opel drivers to be able to reach over 400hp with their stock hpfp.
Iam working on my own high capacity hpfp which should be able to flow 500hp in fuel, so I went with the bigger injectors. If it works it should be possible to put down 400hp with the DI system.
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