Jet size and quantity for N54

[Autosri]

Hi I’ve just picked up my new car and it’s got an N54 engine I’m looking to get around 450hp out of the stock turbos and keep a decent intake temp

I’ve got a bit of a mish mash system I removed from my old car I’d like to reuse for a while it’s a 250psi pump with the relief style regulator and a home made arduino base controller
On my last car I used a 0.5mm jet with a 50/50 mix just as a safety margin

I’m looking to install this kit onto the new car but I’m not sure what size Jets to run of how many as it’s direct injection so can’t use the total injector and 15-20percent method

Also is it better to run one big jet or 2 smaller ones for the best atomisation


Thanks

[rotrex]

At this power level, I’d consider running 6x checkvalved 0.4mm jets in a direct port fashion with 50:50 mix. Flowwise the same rules apply.
Just ensure that the jets blow near the intake port into the runner and from the top.
The mist won’t take turns very well.
You would have to retune at this flow level.

If you don’t go direct port, you might follow BMW’s own route and install 3 jets in the plenum chamber. The runners are pretty straight in these engines. This helps the mist actually arriving in the cylinders.

[HenryM]

Originally Posted by rotrex

At this power level, I’d consider running 6x checkvalved 0.4mm jets in a direct port fashion with 50:50 mix. Flowwise the same rules apply.
Just ensure that the jets blow near the intake port into the runner and from the top.
The mist won’t take turns very well.
You would have to retune at this flow level.

If you don’t go direct port, you might follow BMW’s own route and install 3 jets in the plenum chamber. The runners are pretty straight in these engines. This helps the mist actually arriving in the cylinders.

May I ask why the jets should spray from the top?
What's the downside of spraying from the bottom?
All direct port adapter plates for N54/N55 are designed to spray from the bottom because there's no space on the top.