[Want1]

Originally Posted by WEAPON-X

Stock LT4 injectors are equivalent to approx 1500cc, which we all know can make 1000whp. The problem is the injection window on a DI car for when the fuel can spray. Aftermarket cams have different windows to allow the SOI to be changed.

Although the specific gravity of c16 is very similar to 93, I have seen firsthand the lackof rail drop on it vs 93 oddly; however, we all also know e85 consumes a considerably higher amount in the 30-40% range.

800+ wheel HP is very achievable on 93 with the stock high side and our low side fuel kit, the problem is the stock blower cannot reach this without being overspun to the moon, and that takes octane. With direct port meth, e85, a ton of cooling, and a 28k blower RPM, we have seen around 850whp/tq out of the stock blower, but it's on borrowed time for sure. The 103 throttlebody had such a high velocity to it that we had to have a special motor in it to keep it from fluttering and tripping CELs.

I can assure you that the parasitic loss is at least 200whp with that combination as they increase exponentially the faster you spin the blower off the map.

As mentioned, turbos have a much lower parasitic loss, BUT they also do not deplete the rail down low either like a PD blower. This is why you see most of these guys engine dynoing TTs with their larger DI pump and injectors as it makes the products look much more beneficial, and using MS109 vs e85 as well for a much lower fuel demand with the octane benefit. Then guys buy that and put it in a PD blower car and cannot make 1000whp because their fuel demand is instant down low and they are using pump ethanol for octane as well.

So I do believe this could squeak out 1000hp, but as you can see by the AFR, the injectors aren't the issue, but the injection window.

Great info!

Thanks, Ben!