[Nezil]

Originally Posted by msmiljanic

Hi-

What size jets are you considering for a 50/50 setup? What calc did you use? Did you discuss any advantage of using jets of two different sizes to average it out?

My initial calculations were (using the Aquamist charts):

If I’m targeting around 400hp, and planning to run 50/50 methanol/water, I should be looking for ~600cc/min of flow. (1.5cc / HP)

My car, with OTS tune, targets ~17.5 PSI of boost, so 160 - 17.5 = 142.5 PSI.

As I understanding it, the chart on the website is un-compensated, and the chart in the owners manual (shown below, and labelled as 'compensated') has a system loss of 15% applied already.



For a two jet install, I should select two 0.8mm jets (because 0.7mm would be just under 300cc / min at 140 PSI, and you should select the next size up).

I asked Richard @ Aqaumist about this, and his response was that almost all N55 owners go with 2 x 1.0mm jets. This doesn't seem un-reasonable, and leaves some room to grow / tune in the future.

I've also PM'd 963mw to ask what he ended up installing, but he hasn't got back to me yet. It's quite possible he went with the kit defaults, which is one each of 0.8, 0.9 and 1.0. This wouldn't be quite able to achieve the flow of 1.0 + 1.0, but would give you some ability to tune the flow by selecting between the jets supplied. I'll post back if 963mw gets back to me.