NITROUS OXIDE ( nos / n2o ) advice forum

I've done a search for M3's but I couldn't find anything useful, so apologies if this has already been asked...

I'm fitting a single point wet kit to my E36 Evo and I have a few questions, so here goes

1) Where is the best place to fit the nozzle?



GREEN - Just after the MAF in parallel with the MAF
PINK - Just after the MAF but angled into the pelum chamber
YELLOW - In the middle of the elbow pointing at the throttle bodies (I have a feeling cyl 1 & 6 might not get enough N2O though)

2) Are the jets the same for fuel and N20? I have a bag of mixed jets, they have BHP numbers on them, but no other markings.
3) What jets should I start with? *EDIT* I've just found out the numbers on the jets arn't equal to BHP and that you fit different values to N2O/Fuel to adjust the mixture. so what number jets should I start off with?
4) can I get a replacement sticker for my bottle from anywhere, I was going to paint it and reapply the original sticker as it's a bit tatty.

Cheers for the help. I've got everything fitted now apart from the bottle.




Will 100/35 do? I have a selection of jets, but no 30

Also what does 100/35 equate to bhp wise as a rough estimate? and at the other end of thd scale what jets would 75bhp?

Is there an optimal ratio of fuel/n20 jet sizes? Should I get my car on the rollers and check the AFR when I start upping the power? Should I do it for the 100/35?

You might want to have a slightly short fuel line to the injector, especially as it's firing upwards against gravity


On an unrelated note, I wonder how an inline 6 engine like above would consume the nitrous when the intake looks as though it'll be heavily biased towards the middle two cylinders. I guess all 6 cylinders must get an equal amount of air from the R&D at BMW, but I'm just thinking out aloud I guess...

^^^ Thank you sir, I didn't know that about the fuel pressure being higher on BMW's.

Also, regarding the intake, that's a very good point you make...in that case, perhaps it's best that the intake design feeds centrally - makes me wonder why many cars have it from in from one side making the flow biased, but I guess the main reason is space/cost etc.

Cost is ALWAYS the driving force in 99% of production companies, even with performance products.

Thanks for you help, I sent my pulsoids off the other day to be refurbed, got them back and refitted so I'm good to go now, just need to get my bottle filled.

I found a table with jet sizes Vs approx BHP, I'm gonna start with 100/35 as that the closest match I have, so that should be a fairly rich 50bhp? I believe I want to be aiming for an AFR of 10? So long as everything goes alright with the 100/35 I
'm planning on changing to 150 n2o then getting it on the rollers and whatever fuel jet give me 10 AFR.

Only other concern I have is, I tested the system with the little pressure that was in my bottle, it still gives a good blast of n2o. But the spray that comes out of the nozzle just pretty much hits the top and side of the air intake elbow and condenses then runs down it.

Is this not a bit of a problem? Or will it be different when the engine is sucking air though there at full throttle?

Glad to hear they reached you OK.

Your target AFR wants to be in the 11.5 to 12.5 region, 10 would be far too rich.

Once the air is flowing the nitrous and fuel flow will be fine, just make sure you have the Crossfire protruding in to the airflow as much as possible.

Thanks for the heads up on the AFR, I read somewhere that the target AFR was 10 with nitruos, which I did this was massively rich.

The jet does protrude as much as possible, but bizzarly it does seem that the jet of vapour that comes out of it if anything is angled up towards the top of the duct. Which seems counter-intuitive as if anything I would of though the jet would be angled downwards.

Could this just be because theres no liquid left in the bottle and I'm running a relatively low pressure? I've checked and the nozzle is clean.

Rather than speculating I'll get my bottle filled and take a video of it in action, it's probably the easiest way to show what I mean I'm just excited and want to get as much as I can sorted now lol I cant get the bottle filled till next Wednesday