I've never posted in this section before so forgive these rookie questions. I have a 385 stroker with forged internals. I was thinking getting a n2o kit, nothing to crazy. Would I need to adjust my computer tune and injector size to spray the engine? Does n2o damage the engine? I was thinking of 100-150 shot.

http://m.summitracing.com/parts/nos-05151nos/media

 

ok, that's what I have.

 

why in the world would I have to do that? The plate fits between the throttle body and pleanum. It's a kit for my application

 

Don't feed the troll.

-- Joe

 

Does your msd have a built in timing retard function?

 

Owww...ok...sooo you have 2 different cars then?

 

I'm just running the MSD 6AL, It doesn't have a timing retard that I'm aware of. I also have my knock retard off in my tune.

 

you seem confused. Mods in sig and a Super Ram is TPI.

 

Sounds like you have a sweet setup. The general rules of thumb are to start small, pull 2* for every 50 hp, and pull a spark plug after a test run to make sure you aren't detonating or running lean.

I don't know enough about EFI to help you much further than that, especially aftermarket stuff. I would recommend you look at Nitrous Express as well, NOS kits seem like they haven't changed much in the last 15 years.

 

If you want to run a plate kit, do a tpi based kit behind tb. Else buy an efi single nozzle wet kit and add onto it as you see fit.

Wont have to change the tune but need to pull some timing. Like said start with smaller shot and pull around 2 deg per 50 hp. I just threw in my 150 shot jets and pulled 6 deg via my ignition box which has nitrous control. Jetting was pig rich and timing was low. Ended up jettin fuel leaner until it was around 11.8-12.0 air fuel and added timing back in where it took only 2 deg less than my na tune. Went from 10.9's at 124 mph spraying high first gear, to 10.63 at 127-128 spraying off converter. Picked up 3 mph with jet and timing change but i think it may have been too aggressive as i found a plug with no ground strap.

My kit i added a wot switch on the throttlebody and ran that to a rpm window switch in my ignition box. Also wired it to the timing retard function. So nitrous only came on when car was at wot and above certain rpm and while that happened, it pulled timing to a preset value

 

A ram is not a TPI

 

I tried, I'll take your advice from this point on with him.

 

Good call.

-- Joe

 

If your only planning on running a 100-150 shot, then no, you do need to install larger injectors. Once the spread (jetting) has been established we then fine tune using our fuel pressure and timing, as you will see that the slightest adjustment in pressure will make a very substantial difference in your air/fuel. Use the recommended jets that your kit specifies to start with, despite your engine being larger. Your engine is making a significant amount of horsepower as it is, so your goal should be in the 11.5:1 range in terms of air/fuel. Nitrous allows for burning the mixture much faster, so pay attention to your timing when you dial it all in, make sure you constantly read your plugs until you are satisfied with how they are burning the mixture. If you feel you are not making the power you should be, plugs looks good, and you have exhausted all of your pressure and timing tweaks, then it will be time to try a different set of jets...

 

im gonna give you my , i been doing the nitrous thing since the mid 90's both on my 1990 gta and my x275 drag car(500+hp of n20)
i suggest the nos 05151 plate system or any plate system that goes behind ur tb.
then you should get a msd digital timing retard box for ur msd, with your compresion you can get away with 93-94 octane .
with a 150hp jetting i would start -6* from your base timing n/a, ngk 5 or 6 should do your tune up it's going to be rich for sure.
start taking fuel out untill you have it cleaned up, then and only then!!! start adding timing.
do not tune with your o2/wide band on nitrous.....i will tell you why...o2 sensors many times are thrown all over the place with an adition n2o on the mix...there is many gases produced from the burn with nitrous wich will show a rich reading sometimes the other way around depending on 0/2 sensor!!!
only tune with ur plugs and i mean the 8 of them not just 1.... once ur happy with ur plugs, where ever ur o2 reading is...it's going to be just that a reading...don't get all hang up on it.
tips i suggest u should know:
_dont try to squeeze every hp out the tune as pump gas is not cosistant like race gas so lil bit on the safe side is better
_to fine tune ur fuel after fuel jet has been reached...use ur afpr to fine tune it in 1/8-1/4 lb incresments
_only add 1* at time
_watch mph on the 1/4 mile for ur timing the moment ur reach max mph on ur tune up thats going to be ur best timing


i think that should sum it a lil bit i can get into it deeper but for a start thats good..lol
this is only my opinion and many many years of playing with n20...my gta runed mid 11's on motor dd and after tunning on 150hp n20 jet i got 10.21, im going to try 200hp n20 jet hoping to get 9's hopefully..lol

 

I never retarded timing until 150 shots. I thought it was 2 degrees every 50hp after 100hp. I ran 3 degrees retarded timing with a 180 shot on hyper pistons and 91 octane for a long time without problems. It was fine when I pulled it off the car

http://m.youtube.com/#/watch?v=FMEe7JqBgvg