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.