View Full Version : Nitrous missing in second-third gear


_JB_
08-08-2006, 10:07 AM
Well, I got my plate from Nitrous Outlet and hooked up the 150 shot. Everything seemed fine in first gear, second gear the car missed one or two times, then third it really missed. It misses so fast I can't see how low the fuel pressure drops, high 50s I know for sure. The n2o pressure was 1000-1025.

Without the n2o, wot will get 58psi fuel pressure, idle is like 62psi. Mods are in the sig, but I'm not sure why it's missing so bad. Anyone have an idea?

Nitro Dave's Nitrous Outlet
08-08-2006, 10:10 AM
What is the airfuel. You may need to lean the supplied jetting out.

If the fuel pressure only drops a few psi and recovers quickly that is not an issue.
Dave

_JB_
08-08-2006, 10:21 AM
What is the airfuel. You may need to lean the supplied jetting out.

If the fuel pressure only drops a few psi and recovers quickly that is not an issue.
Dave

The jets I'm using are what you supplied me with for the 150 shot, Fuel: 38, N2o:62

The car jerks like it is missing, as in it throws you back in the seat about every .5-1 seconds in third.

Nitro Dave's Nitrous Outlet
08-08-2006, 10:31 AM
Sounds like its rich. You may need to go to a 35 or 33 fuel jet. Have you checked the airfuel?
Dave

_JB_
08-08-2006, 10:31 AM
No, I don't have a wideband o2. I'll try the smaller jets

Nitro Dave's Nitrous Outlet
08-08-2006, 10:35 AM
Do you know how to read spark plugs?

Im pretty sure its running rich... But its better to know for sure.
Dave

_JB_
08-08-2006, 10:54 AM
YesI know how to check plugs, but the car is too hot to attempt to look at them. I tried the 33 jet, it still missed some but not as much as it did. Noticed some pinging though.

Nitro Dave's Nitrous Outlet
08-08-2006, 10:58 AM
Pinging is not good.

Did you try the 35 or jumped strait to a 33.
That may be one extreme to another. (rich to Lean)

This is why we suggest using a wide band to tune air fuel. If that is not available we suggest reading plugs.

What is your timing at?
Dave

_JB_
08-08-2006, 11:16 AM
I tried both jets, the 35 still jerks, with a little pinging. The 33 makes the car jerk less than the 35, but pings more. I have no idea what my timing is, I'm guessing stock.

I'm guessing the car is spark knocking, there is a little noise every so often.

Nitro Dave's Nitrous Outlet
08-08-2006, 11:25 AM
I would not keep shooting in the dark on this one. Go have the car tuned. the pinging is either from being to lean, to much timming or no fuel..

Dave

1badgsx
08-08-2006, 11:26 AM
Whats The Plug Gap??

_JB_
08-08-2006, 11:32 AM
Damn, I figured thats my luck. Damn thing does the same thing with the 100 shot also. I might as well sell this thing, I'm tired of putting money into n2o.

The plug gap is .4 it I remember right (was about two months ago), I set it for a 125 shot, they are TR6 plugs.

Nitro Dave's Nitrous Outlet
08-08-2006, 11:36 AM
Plug gap should be about 35-36. Make sure you do not have a cracked plug.
Dave.

_JB_
08-08-2006, 11:46 AM
They shouldn't be cracked, probably only have 2k miles on them. I'll have to pull them this weekend when the car sits overnight.

1badgsx
08-08-2006, 04:07 PM
on my 10sec gsx, i was blowing the spark out and the gap was set @28 (iwas running 30psi and 100 shot) i had to bring the gap down to 22 before it ran right, so even tho 36 and 40 doesnt sound like much, it is.

i would replace the plugs (all of them) and set the gap to 33-35, run it with a 100 shot and if its ok then go up.

SPLATT
08-09-2006, 05:44 AM
+1 on the gapping man, try a 34 or 35.

BigDaddyZ28
08-09-2006, 06:41 AM
Damn, I figured thats my luck. Damn thing does the same thing with the 100 shot also. I might as well sell this thing, I'm tired of putting money into n2o.

The plug gap is .4 it I remember right (was about two months ago), I set it for a 125 shot, they are TR6 plugs.


Judging from the way your car looks, I would say your car is well worth the money you would have to spend for a good tune or something to monitor your air/fuel with. :)

You have way to nice of a ride to do your install 'half way' IMHO.

Hope it all works out for you friend. :drive:

_JB_
08-09-2006, 09:00 AM
+1 on the gapping man, try a 34 or 35.

I'll try that if I get a chance this weekend.

_JB_
08-09-2006, 09:04 AM
Judging from the way your car looks, I would say your car is well worth the money you would have to spend for a good tune or something to monitor your air/fuel with. :)

You have way to nice of a ride to do your install 'half way' IMHO.

Hope it all works out for you friend. :drive:

The reason I didn't get a wideband is because I already spent over what I wanted to. Plus I don't want to get it tuned because I am tired of putting money into something I plan to getting rid of in a year or so (want a turbo), plus I don't have anything on my car that needs a tune.

I'll try the 100 shot again today and see how it does. That's all I planned on running anyways, so maybe I'll just back it down.

Thanks for the replies!

01Z28M6
08-09-2006, 10:27 AM
What I found out about N2O kits is the cost is about half of what finally gets put into them. You can't guess on your a/f because every early detonation is doing some amount of damage. Running lean is eroding the tops of the pistons and other things. Every kit maker I know of wisely creates a rich mixture for a safety margin. People using nitrous have to be made aware that monitoring the a/f is critical for performance and the life of the engine. No one should run nitrous for any length of time without knowing if their setup is lean or rich. It should be the first disclaimer when reading the instructions and preclude every sale.

_JB_
08-09-2006, 10:48 AM
I've read so many threads on how people get away with no tuning and no retard up to a 100 shot. Figured I would be one of them.

But for a wideband 02 and a tune would be close to another $1k, that would bring up my total to almost $3k, I don't think so. Granted I could use the o2 in the future (just like the fuel pump), but that's a long ways away.

Nitro Dave's Nitrous Outlet
08-09-2006, 12:15 PM
JB,
We always suggest knowing if the car is running rich or lean. The guys that just put it on and hope its right are the guys that always tear something up. Then they blame it on nitrous.

When using power adders no matter what type air fuel is critiacl. So is timming, and fuel supply.

I think we need to back up a minute and figure out why your car is pinging..
Its either running lean from not enouigh fuel pump or needs bigger fuel jets. Or it has to much timming. The spark plug gap could be a problem but shoudl not cause pinging.


I just reread your origianal post. It says the fuel pressure drops to the low 50s.
How low exactly and how does it recover?

Dave

Camaro94SS
08-09-2006, 12:48 PM
No one should run nitrous for any length of time without knowing if their setup is lean or rich. It should be the first disclaimer when reading the instructions and preclude every sale.

on big shots....yes....what about a 100 wet shot? the PCM should be able to handle that all day with adjusting itself....right???? AS long as tr6s are in...

_JB_
08-09-2006, 09:21 PM
JB,
We always suggest knowing if the car is running rich or lean. The guys that just put it on and hope its right are the guys that always tear something up. Then they blame it on nitrous.

When using power adders no matter what type air fuel is critiacl. So is timming, and fuel supply.

I think we need to back up a minute and figure out why your car is pinging..
Its either running lean from not enouigh fuel pump or needs bigger fuel jets. Or it has to much timming. The spark plug gap could be a problem but shoudl not cause pinging.


I just reread your origianal post. It says the fuel pressure drops to the low 50s.
How low exactly and how does it recover?

Dave

It drops to about 58psi, hard to read because it jumps so fast.

pyro719
04-24-2009, 03:00 PM
My car is doing the same thing. Runs great in first and half of second and then starts missing all the way through third WTF?

Nitro Dave's Nitrous Outlet
04-24-2009, 03:07 PM
Wow. Holy old thread.lol.
Tell me about your set up and tune up..
Dave

pyro719
04-24-2009, 03:28 PM
Nitrous outlet plate kit with 62n 38f jets, 38* of timing pulling 8 out with the mallory 685, walbro 255 pump with racetronix hotwire kit and new fuel filter Bottle had 9 pounds in it and was at 1050 at the begining of the run and 800psi at the end of the run. Runs great in first and half of second but then starts to miss and lose alot of power. It even detonated once when pulling 6* of timing so I upped it to 8*. 91 octane pump gas as well. I'm thinking I could be going rich still from pressure loss?

Nitro Dave's Nitrous Outlet
04-24-2009, 03:50 PM
You should not be seeing that amount of pressure drop. You either have a bad bottle fill or there is not as much nitrous in the bottle as you think.

First thing we need to determain is why the huge pressure drop.
How is the bottle mounted in the car?
If you hold the bottle in your hands and crack open the valve does it stay a huge white solid cloud?

Dave

pyro719
04-24-2009, 04:27 PM
The bottle is mounted like this. See pic. When I purge there is a nice white cloud of nitrous. Maybe the angle of the bottle is not enough? It is olmost flat with a sligh angle.

pyro719
04-25-2009, 09:10 PM
Here is a vid, I mean sound clip of the run. You can hear it breaking up in third. http://s170.photobucket.com/albums/u279/pyr0719/?action=view&current=sticvsz282.flv

That was the second run.
Here is the first run.It pulled better in third except for a little detonation at the end. http://s170.photobucket.com/albums/u279/pyr0719/?action=view&current=stivsz281.flv

_JB_
04-26-2009, 03:06 AM
Here is a vid, I mean sound clip of the run. You can hear it breaking up in third. http://s170.photobucket.com/albums/u279/pyr0719/?action=view&current=sticvsz282.flv

That was the second run.
Here is the first run.It pulled better in third except for a little detonation at the end. http://s170.photobucket.com/albums/u279/pyr0719/?action=view&current=stivsz281.flv

That's exactly what mine was doing; turned out to be a bad ground. :( Good luck!

GT Griller
04-26-2009, 12:03 PM
Wait...i thought 58psi...is borderline to low for WOT?

pyro719
04-26-2009, 06:02 PM
I'm pretty sure my problem is loss of bottle pressure and not enough nitrous in the bottle. I'm going to get the bottle topped off, 10lb's this time, and spray it in third gear and see if it still does this? And go from there. It shouldnt be dropping 200 psi on one run.