Direct injection - forced induction application

I'm looking for some general information on direct injection in regards to excessive forced induction.

Every example of an engine with direct injection and high levels of forced induction typically involves just increasing the size of the regular fuel injectors because the mechanical pump can't keep up with the flow.

Are there any examples of high horse power applications (e.g. billet block) that are using direct injection as a primary source of fuel?

 

What's your definition of excessive boost and high horsepower?

My WRX is DI and runs 16 lbs of boost from the factory. I haven't started down the rabbit hole of modding it, but I'm pretty sure people increase the boost regularly when getting tuned.

At least a couple of companies are finally starting to make high flow HPFPs for the WRX, but from what I've seen, they have issues. If you want big power, your best bet is still a secondary port injection setup. Also, adding port injection helps reduce carbon buildup on the valves which is an issue with DI engines.

 

I'm familiar with some of the necessities of port injection along side DI like keeping the intake valves clean. My definition of excessive boost? 50+ lbs. Nothing that would typically be driven on the street. DI does wonders in daily driven stock vehicles and I'm wondering how far these benefits would take an engine as the power is increased. Can more power be made with DI? Can the AF mixture be leaner than port injection?

My question mainly originated from two things.

1. aftermarket direct injection fuel pumps don't seem to be available which pushes higher end tuning into using port injection.
2. I saw a 1000hp 2020 supra recently that replaced the DI injectors with plugs (is this a symptom of number one?)

 

No idea. That's beyond my level of DI technical knowledge. I think right now aftermarket HPFPs are application/engine specific since they're typically driven off the cams. Nostrum and I Build Racecars are the two companies making upgraded HPFPs for the Subaru FA20.

I'd assume that the AFR should be the same or very close between DI and port, since you're still burning gasoline. You might be thinking of the difference between gas and ethanol.

 

Interesting topic, and was quite surprised to see it on Tacomaworld.

I was recently looking into DI and aftermarket ECU control. I came across an interesting topic on the Haltech Forum which one of the Haltech Engineers responded too and I think his reply at the end answers a lot of questions someone who knows a thing or two.

https://forums.haltech.com/viewtopic.php?t=34097

 

Surprised on Tacomaworld? Aside forom StackExchange, this is the only forum I'm really on. On top of the, @OVTune is basically releasing a turbo kit for the 2GR-FKS any day now.

After starting this thread, I was surprised to see several options for aftermarket DI pumps and injectors. I think they were for an LS and FA20. I'm sure there are others.

 

Surprised someone asked a question of substance. Versus “will 285’s fit on a stock truck.”