NITROUS OXIDE ( nos / n2o ) advice forum

I hope so cos he just paid £26k for it whereas my Z4 is worth about £5k tops, my 230bhp +75 shot Vs his 325bhp auto & I think his car weighs about 100kg more than the Z4. Wouldnt like to underestimate a Porsche tho?
Still I can always upgrade to DP!

What a fun day albeit a little naughty if Mr Plod saw us! Well I can report back on the Z4 vs 911 duel.....

We didnt do any standing starts or drags or anything like that just drove around until we had a chance to blast off usually from 2nd gear and it was pretty much even I was up ahead but the 911 would never have got past me, my mate said he gave it absolutely everything to keep up but so was I?

As Dominic Toretto said "It doesn't matter if you win by an inch or a mile: winning's winning."

I was having a little problem with the traction control coming in even in 3rd gear so that may have held me back a bit.
That would hold you back A LOT actually, even if it steps in for a mere fraction of a second. You might want to find out how to disable it for such events.

I did reduce the build time from 2 secs to 1 sec in 3rd to 6th, so maybe I need to turn it up again, also ran out of revs as Ive got the nitrous only on to 6000rpm and the car redlines to 6500, but this is probably splitting hairs.
Another huge disadvantage! Only set the cut off point to only 100-200 rpm before the engine limiter kicks in. Or else, you'd have to change to the next gear just after nitrous cuts out to keep your torque output up, and BMW's LOVE rpm so it's not the most efficient route.

My mate was well impressed with the effect of the Nitrous.
Just hope he doesn't get sneaky and one up you by installing a WoN system on his Porsche or else you're gonna be super screwed!


I'm currently looking at changing the diff from a 3.07 to a 3.64 ratio, there are a few threads out there saying what a brilliant upgrade it is for the 3.0 Z4 manual, only trouble is they can only generally be found on a 2.5I auto or 3.0SI auto and they are alot rarer to find in scrap yards in the UK, also the 3.0i auto has a 3.46 ratio so thats an option too but still fairly rare, just need some patience.
Generally, I oppose going up in gears like that for nitrous engines where they have the upper hand in developing massive low end torque. Usually,
the result is more difficulty getting traction and less time the engine is in lower rpm where the nitrous gives the most torque. As I mentioned prior, BMW's love to make power up top and if you couple the gears with a proper cut-off rpm, you should be able to increase acceleration quite a bit.
The problem you'd have is setting a slower build time (and possibly start %) on the Maxy because the traction problems will increase with the gearing.

What an excellent day and we both returned alive!

True enough im probably getting greedy as quick as a 911 is not bad is it and with a few tweaks as above to improve things....still learning etc, even my buddy said he thought that going to DP would be too much power for the car and I tend to agree.
To what regard? I think he just doesn't want you to be faster out of jealousy...

The performance is fantastic as is and considering how theres quite a lot of talk about how the BMW's inlet configuration restricts performance, I couldnt agree with that,...its awesome and frightening at the same time.
Right now, you are pretty much in the sweet range where the intake manifold is still performing its function and airflow is improved by the action of injecting the nitrous. By switching to DP and elevating the nitrous flow, the airflow to the engine will further increase beyond the intake and butterfly valve norms with normal volumetric efficiency.
That is until the nitrous flow becomes so great that the intake manifold performance actually decreases and flow can actually begin to reverse (reversion), leaving the power being almost purely made by the nitrous mix. Of course, you'd have to be flowing LOTS of nitrous: much more than a standard engine can handle. You can learn more by searching for the Wizard's thread regarding the SSIS.

In short, the intake manifold has very little to do with the engine on nitrous where DP is concerned because the TB and plenum functions are bypassed, which is contrary to many common nitrous myths.

Thanks guys its a lot louder and screamier in real life

I figured activating the first gear in a different memory file would be an quick fix for the time being.