I have a friend who has a NOS nitrous kit. He's been pushing 100 shot on 1 step colder plugs. He's melted the #4 cylinder plug several times with everything else stock. His A/F readings show 10.9-11.8. He's been running rich intentionally for safety reasons.

Can anybody explain what may be happening and why?


Anybody run Nitrous with just a Plenum spacer?

 

i thought running rich was going into 13 and 14s. but i could be wrong because i always get it mixed up :/

 

Lets tell the truth. You don't have any friends.

 

+1...time to call the internet detectives.

 

haha you fail everyone knows this friend is you why not just be honest whith us

 

Higher = leaner, lower = richer.

10 is max rich on a wideband 20 is max lean.

 

Can you post high res detailed pics of the spark plug?

If not, what exactly is melting, and is there any discoloration of the insulator (the white part)? Is the insulator broken or cracked at all?

Also, in the mean time, if he's still running it, he might switch that injector to a different cylinder. If the problem moves, then it sounds like that injector is bad -- too lean.

 

So, "your friend" is running a 100 shot of nitrous knowing that his #4 cylinder plugs melted several times before?

Also, AFR of 11.8 isn't "rich" at all. And just so you know, running rich will also cause problems (i.e., backfire).



Anyway, what are his jet sizes, what bottle pressure, any tuning, timing changes, what plugs, what gas, etc?

Why don't you have "your friend" get on this forum and speak for himself?

Also, I don't have that many bolt-on mods (just intake and exhaust mods).

 

 

No, its not me. I have just been considering nitrous but my 2 friends that have been running it on their G's have got me a little timid about it. One has been burning plugs, the other was running a 100 shot for a while. Stepped up to a 150 shot with meth injection. Ran 10+ bottles through his motor. When he added a plenum spacer = blew a rod.


So, melting plugs -

He's been running 950-1000 psi (10 lb bottle) with 100 shot NOS jets (.047 and .030)

1-step colder plugs

5AT (Transgo shift kit)

UTEC (pulled 1* map, -2* map, -3* map)

Innovate LC-1 Wideband

RPM window = 3300-6200

friend doesnt frequent the forums like I do, but I'm baffled and cant make sense of it

Added the 5/16" spacer recently and has been getting knock so he hasn't sprayed. He dropped to a 65 shot and was still getting knock that is audible. Its not noticeable without spray. He added a meth kit as well and that hasn't quelched the knock (if its a true knock and not false).

 

His getting knock now, all motor? Something aint right, what oct fuel is he using? too much timing perhaps?

I heard a long time ago that due to the design of the Z or G intake manifold one cylinder always ran leaner, never looked into this in detail since I dont have such intake manifold, so prob not even fact.

anyway, -3 timing retard? that dosnt sound like much for a 100shot. Id be retarding alot more if it were my car, specially stock motor.

 

Interesting. I just did my plugs yesterday but I didn't see anything abnormal (although I haven't really looked at it) and no oil. My abused engine's at 105K+ with 100 whp shot and only retarded 2 degrees.

Anyway, I'm not seeing anything that could be problematic. What does this knocking sound like?


As for the rod going when the spacer was added, it was probably just time for it to go. Spacer shouldn't have affected anything, although with a spacer, the front 2 cylinders would be able to breathe more (+ nitrous).


Also, it's the driver's side bank that's a bit leaner, not a single cylinder. That's why you install wideband sensors on the driver's side.

 

No knock sound all motor, only notice it with NITROUS.

Wideband is on drivers side.

ya, he was spraying 100 shot on stock timing for a while. Thats why he added meth injection to help compensate for heat and raise octane. Added UTEC 3* timing at the same time.

Knocking sound happens even with the 65 shot jets in. Not just the 100 jets. (Thats with the 3* timing pull map as well as 50/50 water/meth injection kit)

 

Is this a Wet or Dry kit? Hoping wet. But eitherway. he should get his injectors checked, specially that one that is having problems. Melted spark plugs is never a good thing, tell him not to spray it anymore untill he has found the problem.
Also, combining the meth/water with the nitrous, almost doubles the output of the nitrous jetted power rate, so a 65shot with meth will produce almost 100hp. Id say retard even more timing. 3degree's really isnt much. in my opinion.

btw, is he tuning his timing based on knock audible sound? if yes then thats the worse way of tuning in my opinion(unless a cat-can is being used). I tuned like that on my maximas' vq30 and ended up with a leaking headgasket eventually. Dosnt the UTEC have the ability to get knock count?

 

curious how you figure the meth injection almost doubles the added power of nitrous. thats not my belief at all, in fact, it effectively raises the octane level (helps fight knock) and keeps engine temps low, but if you can find a reputable source, then i will eat my words.

yes, utec monitors knock, but the knock is so bad he can hear it. he is not tuning off of audible knock. it is just that bad.

 

my lc-1 reads in the 9s if i get that rich, ive seen it

 

the instant his solenoids open, it detonates, the same instant

 

Do your research on meth/water injection + nitrous. you'll conclude the same as what I said. Maybe not almost doubled, but a very significant power increase over the nitrous jetted HP, its been done since the old domestic days.

Might wanna try 2step colder plugs.

 

ive done research, and i concluded different than you. plus ive seen a vq35 dyno 310 on a 100shot, then went to a 150 and added meth injection and dynoed 360. find me where you got your info. everything i have read says otherwise

 

I would think that the added power with the addition of meth would come from the ability of being able to increase the timing from having more octane instead of the actual nitrous itself if tuned to utilize it for more power. If the person added meth for more safety and did not tune to gain more power, that is still understandable. So I would say that you can gain more power with meth at the same jetting but it is gaining its power from the timing and not the actual nitrous itself. Example, numbers are made up, without nitrous without meth, you are running 10 degrees of timing, add meth to the equation and adjust your tune, you will be running at 20 degrees of timing. So if they did not tune to utilize the meth for power, then it would not gain any power, just be safer. Then again, the ecu might adjust itself for the added octane since it will detect less knock, so it will increase the timing and gain more power without tune, maybe. But I would think that adding meth with no tune will yield no power like you said, just my opinion, but I'm no expert, so take it for what it is, this is just from the research I have done also.