before doing my N2O install, I had bought an OE plenum (upper/lower) with the intent to modify the interior of it for NA (something simlar to MD's [motordyne] modifications, but more extensive)...but now that I have nitrous, I've been searching to find what the best plenum design would be.

I've tried looking at intake manifold/plenums for carburetors, since those are also designed for air/fuel mixtures to flow through them, but I haven't found too much info as of yet.

preliminary design thoughts:
-perform similar modifications to the lower plenum as MD (reduce material over front runners)
-leave interior surface untouched (a rougher surface helps to evaporate any liquid that is on it...)
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-should I reduce the runner lenghts? (this would likely move the peak power higher in the rpm range...)
-any other thoughts???

goal: maximize power for N2O use in higher RPM range (4.5K and above) while retaining streetability (I still need to drive this car daily)

thanks,
Peter

**I know that I could just increase my N2O shot, but for now, I'm staying at a 75 shot and just want to maximize what I have.

 

Honestly, I don't think it'll help too much. If you port it a bit, it'll help for N/A usage but with nitrous I think the flow is just pressurized and gets forced into the cylinders.

Maybe smoothing out the rough passageways might help a bit but I don't think you will see big gains. Just install the 100 shot jets and turn that frown upside down.