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Nitrous missing in second-third gear

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Old 08-08-2006, 09:07 AM   #1
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Default Nitrous missing in second-third gear

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?
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Old 08-08-2006, 09:10 AM   #2
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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
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Old 08-08-2006, 09:21 AM   #3
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Quote:
Originally Posted by Nitro Dave's Nitrous Outlet
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.
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Old 08-08-2006, 09:31 AM   #4
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Sounds like its rich. You may need to go to a 35 or 33 fuel jet. Have you checked the airfuel?
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Old 08-08-2006, 09:31 AM   #5
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No, I don't have a wideband o2. I'll try the smaller jets
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Old 08-08-2006, 09:35 AM   #6
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Do you know how to read spark plugs?

Im pretty sure its running rich... But its better to know for sure.
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Old 08-08-2006, 09:54 AM   #7
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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.
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Old 08-08-2006, 09:58 AM   #8
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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
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Old 08-08-2006, 10:16 AM   #9
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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.
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Old 08-08-2006, 10:25 AM   #10
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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
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Old 08-08-2006, 10:26 AM   #11
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Whats The Plug Gap??
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Old 08-08-2006, 10:32 AM   #12
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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.
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Old 08-08-2006, 10:36 AM   #13
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Plug gap should be about 35-36. Make sure you do not have a cracked plug.
Dave.
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Old 08-08-2006, 10:46 AM   #14
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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.
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Old 08-08-2006, 03:07 PM   #15
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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.
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Old 08-09-2006, 04:44 AM   #16
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+1 on the gapping man, try a 34 or 35.
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Old 08-09-2006, 05:41 AM   #17
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Quote:
Originally Posted by _JB_
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.
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Old 08-09-2006, 08:00 AM   #18
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Quote:
Originally Posted by SPLATT
+1 on the gapping man, try a 34 or 35.
I'll try that if I get a chance this weekend.
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Old 08-09-2006, 08:04 AM   #19
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Quote:
Originally Posted by BigDaddyZ28
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.
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!
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Old 08-09-2006, 09:27 AM   #20
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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.
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Old 08-09-2006, 09:27 AM
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