NITROUS OXIDE ( nos / n2o ) advice forum

What was this on?
The nitrous standing start world record holding Busa from Finland

A 4 pot or half a v8 with 4 egt's ? - I would like to know the piston and exhaust layout
Conventional 4 pot

and what nitrous setup (DP or single point)
Pro Series REVO (dry)

I personally would expect some variance when the engine is just ticking over prior to the start as at low revs there is probably a slight mix difference due to the low fuel volumes used giving more variance (leaner being hotter). There also could be some feed back from the pipes that are being cooled unevenly. Then when the throttle is opened any heat in the tubing would negligible in the volume of gas from the engine and there is much more fuel being used which would bring the egt's into line.
On a Motec controlled fuel injected engine I wouldn't expect to see much variance in the above respects.

I would like to see a datalog from a non nitrous run.
Hopefully on its way soon.

Certainly the cylinders are burning evenly and it is showing a good even distribution of fuel and nitrous. The EGT's would be uneven if the distribution of fuel or nitrous was off.
Exactly

Once what appears to be the run has started (looking at the revs) before the nitrous is started the EGT's are already stabilizing and are not at much more variance than later on. The smaller injection of nitrous certainly does cool the exhaust but when the large hit of nitrous starts then the EGT starts to climb. I am assuming there is an ignition cut or something for the 4th to 5th gear shift and this lets unburnt fuel and nitrous through which again cools the exhaust. The shift to 6th is accompanied by more nitrous which raises the EGt's and starts to show a more uneven temperature.

From this a modest hit of nitrous certainly cools the exhaust.
I don't think we can be certain of any of those assessments until we see a NA run.

Would be interesting to see AFR plotted against this as well as considering the rise in nitrous 5th-6th, it seems to take an awful lot longer to rev out in 6th, so maybe its possible gone very rich at this point?

Steve