NITROUS OXIDE ( nos / n2o ) advice forum

hi alex or anyone thats reading
Looking at this thread viewtopic.php?f=28&t=7508 , i sold my mini and now have a e82 with the n52 NA engine it has a disa valve inlet manifold im pretty sure the same as the z4 (could be wrong) so my question do i have to go direct port or can i do the easier single crossfire throttle body pipe
cheers ted

i just found this quote ... the DISA's main effect is on intake harmonics..which is only really present at low RPM. at high RPM, and with a turbo, the DISA's benefit is minimal to non-existent due to forced induction not really giving a damn about harmonics when it comes to intake runner design(hence why you then run an open plenum)..it at that point is all about air volume and velocity.

so im hoping i can get away without direct port

right in case anyone was wondering just spoken to trev and i can use throttle body set up
soooooo quiet here

I checked the forum yesterday and your post wasn't made yet lol. For a low dose, a single crossfire would do OK. Probably 75 progressive or so. Higher doses would need a pro series (3 pair pulsoid) or D-block setup.

I'm working on my own I6 project using twin crossfires for a low dose up to 150 BHP and later on a Pro Series Triple Pair Pulsoid setup for a much bigger nitrous dose.

im well happy i can do the simple set up....

oh alex forgot to ask
Back in my mini thread i got a 4an adapter for the fuel rail...do you think i will touch lucky that the n52 rail will be the same

I haven’t the slightest idea about that. Im sure you can exchange it for the appropriate adapter if need be.

ok

i've made a start

https://ibb.co/Z8mvnt1
https://ibb.co/P1Nb8tN
https://ibb.co/vd9cx3v
https://ibb.co/WkgftyB

Nice! The short pipe work is gonna have an instant response.

shortest pipe i've ever made alex

I looked and the manifold again and it may be an additional benefit to angle the crossfire about 45* - 65* to create the vortex and mix the N/F more effectively. Plus it will remove a lot of the momentum of the plume so that the mix is more likely to change direction when it gets to the back of the TB opening. The manifold is going to force the mix to change direction by 180* towards either side and then it has to travel upwards, so angling the crossfire is what I would do.

More so, it will smooth out the pulses from the minimax further reducing the amount of engine stress below that of NA than the system already would!

https://www.youtube.com/watch?v=RoJT8I6h6oE

Skip to 3:45
Pay attention to the 45* angle test and you'll see where I'm getting at.

You'll be happy to know that if you wanted more than 75 bhp, there is the option to use a y-block and 2 crossfires in the plenum tubes (since they split evenly to feed 3 cyls at a time). This will give you the distribution and reduce the chances of fuel dropout for a higher nitrous dose!

It's certainly much less expensive and less complex than a direct port.

many thanks for the insight alex ...

Did you get it done, yet?

hi alex
Sadly i was just about to do the electrics when the car developed a cas unit fault which stops the car from starting
it came with 6 months warranty which was a bonus but it means bmw now have the car for repair
already been warned a complete coding of the car will happen
so goodbye to the remap i had done only a few weeks ago
will be in touch hopefully when i'm back on the road

That's a shame for sure. Hopefully, it all get fixed.

Hi alex
Got my car back and is running well, just wired the bottle heater and will do
the rest after another re-map
its my first automatic car so i will make an assumption you have driven
many , it's the step auto type fitted to many bmw's
so my question is do i drive with nitrous as a normal MT car in manual mode
it has paddles too or auto sport mode which holds the changes for longer
cheers

I’ve driven plenty of autos, but not of the types with physical clutches. If the shift is not instantaneous, then it would be a good idea to cut nitrous off just before the shift with the window function. I’d do that with any factory auto regardless to take stress off during the shift. I worked racing auto can handle plenty of nitrous during the shift.

ok thanks for that...