For you guys with serious know: What is an acceptable, safe, do-no-harm (assuming correctly done with full throttle switching, etc.) level of nitrous shot for a normally aspirated ported 13B (4 port)? 50 hp? 75? 100??? Wet or dry ? Fog or ring ?

Alot of questions tonight, I know, but I'm in the middle of the once-each-decade feed the beast exercise and I respect you guys that have gone where I haven't yet.

 

For a carbed setup, wet is the only option. FI systems can use a dry, assuming you have enough overhead in the system.
Adding the spray means fuel MUST be added too.
Decide on what induction system first, then prep the system to handle the extra fuel load before adding Nitrous.
As for a "safe" level, depends on how good of condition the engine is.......

 

Less than 4000 miles on the engine, even though purchased and installed in 1995.

 

I am starting out with 50 on my 12A and plan on going up to 75 once everything is tuned good (also need a few minor upgrades - long story). I may go all the way to 100 if I decide to blow up my motor. May handle it though, dont know. I dont think it will though.

 

Under the proper circumstances with precautions taken, nitrous should be as safe as any other means of making more power and shouldnt harm engine life. If the A/F mixture is correct and everything is set up properly Ive heard that a 125 shot isnt even too much. I remember reading a thread on here long long ago where someone ran something like 10 bottles of nitrous through their OLD!! stock 12a trying to blow it up before their engine swap but couldnt. I personally dont like the idea of nitrous oxide, but Im tired of hearing it isnt safe. Just be conservative if your engine is not ported. I wouldnt run over a 75 hp shot, a 50 shot sounds safer. The key is to make sure its installed properly, will only activate at WOT and wont lean out your A/F ratio. Keep all that in mind and you should be good to go!

Also IMO, a wet system is the only way to go!
If I ever ran NAWWSS, I would tap my manifold for direct injected nitrous oxide, so it is metered properly and distributed evenly between the rotors. I wouldnt trust a single fogger system, or the plate systems (heard bad things).
Hope that helps!

 

plate systems have been used for YEARS and they are still effectively being used in multiple different vehicles and configurations.

 

I agree they are effective in most situations, and I dont have experience with a 4 port 13B but I have heard of complications with custom made systems for the stock 12a manifold. I believe it had something to do with the design of the mani and how the rear rotor has the provision for the shutter valve. I assume if you are running something like a holley manifold, where everything is even and has the same shape for both rotors it would be fine, but I myself wouldnt trust it. Also, IIRC the nitrous and additional gas are not mixed together before being injected in some plates, which could possibly cause problems. I would just be extra safe and enjoy knowing that the gas/nitrous is going where its supposed to, together.

Not trying to discourage plate systems..Just stating my opinion.

Also, I havent ever ran nitrous, so my stance on the subject is simply from what Ive read. No true experience here.

 

The only thread I have seen about a custom made 12A Nikki plate is the one I made and people flamed me for it being a plate kit because the other styles are "better".

Either way, yes nitrous is cool, and yes I dig it alot. For the record I have a port matched intake mani and it is matched up top also. heres the question. So, lets say you have an aftermarket carb (alot of us do). Now, lets say you want to add nitrous to your car by drilling and tapping a hole into your intake mani. How many people are gonna want to buy a mikuni, dell, etc, even an RB intake mani that has a big freakin hole in it? Not me.

 

IMHE, one per primary intake runners for better automization (max 2) AND run a separate fuel pump to ensure that you dont starve it.