so I have a built High compression b series engine that I assembled & am thinking of spraying a small shot of nitrous to give it a extra kick when needed. I'd like to do a direct port wet shot but not very familiar with nitrous never used it and want to learn more about it. currently the engine is just a naturally aspired platform & debating on doing this. specs will be below for the engine any info or suggestions is appricate along with constructive criticism greatly appreciated ppricated.


B18C5 block & Head
550cc Deatschwerks injectors
320lph AEM fuel pump
Hondata S300 V2 ECU
Rywire engine harness

ITR intake manifold
AEM fuel rail & FPR
AEM true time cam gears
Skunk2 alpha 70mm TB
Skunk2 tuner 2 cams
Skunk2 alpha dual valve springs & retainers
Skunk2 LMA's
Mugen Power 4-1 high flow header 2.5" outlet.
Gates racing timing belt
Cp Pistons 12.5:1 compression
BC LW H beam rods
89MM OE Stroke Crank
Golden Eagle oil jet delete
Golden Eagle Block gaurd
ATI Superdamper street.
ACT press plate & 6 puck clutch
ACT 8lbs flywheel

New OE Headgasket
New OE Water pump
New OE Oil pump
New OE tensioner
ARP main studs
ARP headstuds
ARP flywheel bolts
ARP pressure plate bolts
ARP tensioner bolt
ARP Crank Damper bolt

 

I have read through the "Official Nitrous Thread" from start to finish, and I have learned a couple things:

Nitrous likes high compression
Direct port is better than a single fogger but not strictly necessary for shots under 100 hp
If you do go direct port, direct port dry is probably better
Tune it tune it tune it
read the plugs read the plugs read the plugs
Start small, work your way up to bigger shots


Now I personally have never used nitrous, but I am planning on doing so soon, and have done tons of research. I'm not a nitrous guru, just a guy who has read a lot about it.

 

yes I was reading that reading the plugs is most important not a wideband, and I kept reading debates on high comp vs low comp nitrous I just think direct port will be alot more accurate so all 4 cylinders get the same amount evenly wouldn't a dry shot require me to get bigger injectors to add for the missing fuel ?

 

A dry shot requires ECU tuning to get the extra fuel from injectors. You can set up a wet kit with an ignition box that pulls timing when you hit the nitrous and avoid all the ECU tuning (on a moderate 100 shot or less anyways). One system I helped set-up we pull 4 degrees on a 100 shot wet fogger kit and it lasted forever.

 

yep, wet kit, wideband, open loop AFR 12,5:1 (with nitro) and a little "colder" spark plug

 

A direct port is the best to me because you get perfect distribution of nitrous. Dry is the best (to me) because your injectors are going to do a better job of injecting fuel than any nozzle you can buy, especially since the fuel in a wet nozzle is at 48 psi or so, competing with a plume of nitrous at 900 psi, both trying to get into the cylinder at the same time. There is no way that a wet nozzle can distribute and atomize fuel as well as an injector.

 

Most guys that are really committed to using nitrous end up going with an entirely separate fuel system for the nitrous which makes adding fuel VIA the injectors not possible.

 

While that is true, I don't think that's what the OP is trying to do. He's going for 100 shot or less if I'm not mistaken.

 

The nice thing about using nitrous and fuel jets on a wet kit is you can just change jets to change from a 50 to a 100 shot and don't need a re-tune.

 

i would say its a mater of cost and usage.

If the car only used for drag events, the dry kit is the only option.

If its a car for owner's low cost amusement, wet kit is better.

 

Why do you say that?

 

well my car is crx and i plan it to be a weekend worrior for occasional streetracing, and maybe down the strip. the main thing for me is reliablity & as for the high compression i already know thats abit of pushing it. im debating of spraying a small shot like 50 max 100. dont want to fry my valves or rings as they are gapped for all motor not for a nitrous shot where i believe they need to be cut abit more so it has a larger gap for when the chamber heats up the metal can expand from the rings and not bind on its self.

i do want to use a wet kit as it wont but something seriously crazy and im thinking direct port would be best for it since i dont want to unevenly distribute NOS into chamber #4 & less into #1 with that high compression by just having a nozzle at the TB opening,..so i think direct is best but not sure im looking for facts or info after do this or that. thanks guys alot.