Look, injectors are injectors. You’re making it complicated because you don’t understand it. PI works off of DI. In lamest terms the fuel is pushed out of DI and basically just redirected to a different port within the cylinder creating PI. Why would you even gamble $3100 lol OVtune doesn’t actually have any impressive dynos but have at it. If you’re in the market buy a proven tune from Taiwan like JRC, they’ve hit 255 whp with only a downpipe and intake tube

Our 4 cylinder engine has a total of 8 injectors (4 low pressure port injectors and 4 high pressure direct injectors). Each injector, regardless of type, is controlled electronically via the ECU. The port injectors are located pre intake cylinder valve outside of the combustion chamber, whereas the direct injectors are located post intake valve and their nozzles squirt directly into the combustion chamber. Despite what you think, there is no redirection to different ports. Now remember that these injectors are electronically controlled? We’ll if you payed a little more attention to detail you would have seen that I posted a fuel staging graphic, made available by Toyota, which represents when our different type of injectors are activated based on speed and load conditions. At the highest load conditions, only direct injectors are in use NOT port injectors. Now do you see why upgrading port injectors will do little for top end power? Maybe TTI or JRC already has a solution for this and that would be great leading me to buy those.


On a side note OVTunes poor dyno numbers could very well be lack of experience with the platform and is not a direct reflection of their tuning product. I’m excited because it’s yet another product on the market pushing development of our platform.

8 injectors lol, there will be no lack of fuel with an upgraded fuel system. That’s insane they’re 8 injectors, this is cool. I was hoping upgrading only the DI thinkin that would be enough especially if injectors are expensive. Maybe they’re will be some injectors maybe they’re won’t? What are we trying to say in the end? We can say JRC past 330whp at 19.5 psi becomes inefficient due to the modded compressor tapping out or the fuel system can’t keep up. Maybe jrc isn’t really doing 24 psi @345whp. To those wanting to talk about OV then just buy it. Sounds like a lot of you are on the hook just do it and find out for yourself. To spend that kind of money on something not proven sounds ridiculous. We need more people testing out JRC because they have something worth talking about plus they have dyno proof. Spend $3100 on a OV master tune suite without proven results or 3k on an actual 300+whp turbo package from jrc.

I encourage you to read up on the D-4ST fuel system and the 8AR-FTS here
Toyota AR series engine

Hopefully you’ll see what a few of us have been trying to explain to you. 8 injectors does not equate to an abundance of fuel. It’s designed for fuel efficiency, emissions, valve/port cleaning and cylinder cooling amongst other things, not performance. The only reason I brought up OV is because they clearly advertise full D-4ST control which would be the answer to one of our limiting factors.