nitrous problems with 95z

:confused: I took my nos sys. off my 98z and put on my 95z. It worked just fine on my 98. Both cars were stock. I just had about 50 shot on the 95 to start off. my pressure was at 8psi. first time sprayed it at full throttle at about 3500 rpm car acted like it went real lean and was back firing. then raised pressure to about 10psi. sprayed same way as before same result. what do i do. also need jet sizes for 125 shot if i can get it running.

I assume it's a dry shot. But I'm not clear on what is at 8-10 psi. Are you saying that's your fuel pressure? Or n20 pressure? I'm not familiar with dry shots, but that sure doesn't seem right for either fuel or N20, please be more specific.

this is a wet fogger kit. the nitrous was at 800 pounds of pressure the first time then at 1000 pounds of pressure the second. I have the fogger nozzle set up right in front of the throttle body. mounted in the rubber elbow between mass air and throttle body.

I thought a fogger system was built into the intake to spray directly down each intake runner?? If you said you had 8 or 10 psi on the fuel then you have a major fuel delivery prob. You should be around 40-42psi, thats your prob. right there if thats what you were referring to.

the fogger nozzle does not have to be mounted on the intake. If you mount it right before the throttle body then it will work. I was reffering to the nos when i said 8-10psi. I meant 800-1000 pounds of pressure. the fuel is at 38 psi thought. I have a fuel pressure regulator on the way. it is adjustable so maybe if i get enough fuel going to the injectors it will eliminate my problem. Unless you know of anything else that may be causing my problem.

I may be all wrong here, but with a dry kit and no fmu don't you spray before the maf?:confused:

this is not a dry kit. it is a wet kit.

Have you tested the fuel soliniod, does it open and pass fuel?
38lbs fuel and 1000 n2o, it should work. Do you hacve a fpss? is it set to high?

yes I check the fuel silenod it works fine. as far as the fpss not sure what u are talking about.

fpss is a hobbs switch that well shut down the system if the fuel pressure goes below a preset value, it installs in line on the fuel supply side.
If it worked on your 98 and you installed it the same way on the 95? I would think it would be working ok. Blow compressed air thru the lines to make sure you didn't pick up any debris, are the jets installed on the correct side??
Try a run with the bottle off and see if you go super rich???

no i dont have a fpss. jet are the same as i had on my 98 when it was working fine.I'm going to try a pass with the bottle off. there is a possibility of debris in the line conector on the bottle was cross thread thanx to my buddy. i just tried a pass in the car with the bottle off it didnt go rich at all but acted stronger:confused:

That is strange as he!l. Do you have a fuel pressure test gauge? Hook it the shrader valve then tape the gauge end to a wiper arm and make a wot pass and see what the fuel pressure is doing? It sounds like your lean na if the 50hp fuel jet made the car feel stronger. Maybe try a 100 or 150 fuel jet on a fuel only run. Does the car run good na?:confused:

did you pull a plug after your first pass when you said it "felt" lean?

make another pass wi the nitrous bottle off and the system armed (so you'll get nothing but fuel )

the pull the plugs (yeah i know ****ty job ) but you should do it to see exactly whats happening .

id go with drop top and check the fuel pressure first.
then do this and if its alright after this

try another pass on spray and pull the plugs again (right after you spray it)
let us know.

jimbo

I tried it with sys armed nos was off. pulled plugs looked fine. went back tried a 100 shot. blew maf off blew fogger nozzle out. got lucky car seems to be fine. also fuel pressure is holding consistant.

Originally posted by hotrod2002slp
went back tried a 100 shot. blew maf off blew fogger nozzle out. got lucky car seems to be fine. also fuel pressure is holding consistant.
What rpm did you hit it at? It sure sounds like your going lean. What are you monitoring fuel pressure with? Can you monitor fuel pressure while making a run? I'm thinking you have just enuff fuel volume to run ok na, and when you engage the n2o you go lean causing the backfire.

When I hit the nos it is around 3000 to 3500 rpm. you are exactly right about the car going lean. I can put the tech 2 on it tomorow and monitor fuel when i hit the nos but i beleave i'll try the adjustable regulator first to see what i get first. I think I have the nozzle mounted right on the elbow if you have pics. of yours or somebody else it would be real helpful.

What kind of plugs are you running? an at what gap? are you using an aftermarket ignition? Maybe the N2o is blowing out the spark.
Also I believe jet sizes for LS and LT engines are different.

my plugs are ac/delco they were pre gapped so im not sure on the size of them. there is no after market ignition on the car. it is very possible ls1 and lt1 jet sizes are different. if u could try and find out for me. it will be 6:00p.m. before i can find out.

Single Fogger Wet system HP ratings:

N2O / Fuel

34/18 40HP
37/22 50HP
39/24 60HP
41/26 70HP
43/28 80HP
46/30 100HP
52/33 125HP
61/38 150HP (max for 1 nozzle)


How far from the throttle body do you have the fogger nozzle?

about mid ways of the elbow. had it mounted right in front of throttle body. which way is best?

If you have the nozzle in the correct position, and the jettings are correct. Then test the fuel solenoid with car at idle with the hood open. Enagage parking brake and leave in tranny in neutral. Make sure the bottle is closed, and the system is armed, make the WOT switch complete the circuit by manually depressing it with your finger. The motor should want to stall out if you are getting fuel. The reason I think you should test it this way instead of driving it at WOT is because of puddling of the intake with only fuel going in, maybe that is why it backfired and blew the nozzle and MAF off.

Now for the two scenarios, if it didn't want to stall, then you are not getting the fuel you need, this could be because the solenoid is not opening or it is not getting power to open. Check all your wiring.
The second scenario is if it does stall, then I would start checking the nitrous delivery. Disconnect the line that feeds nitrous to the nozzle and make sure you are getting the nitrous to spray out when the system is armed and the WOT switch is activated.

If you are getting nitrous and fuel, and the fuel prsseure is around 43.5 psi, then perhaps you need to check your wires and coil.