I had a nitrous kit installed and it is not working correctly. It is a zex kit with a window switch, 175 shot on a 408 with an mp 112 making 5 lbs of boost. The tune is good, AFR is good, fuel delivery is not an issue, 60lb injectors and the nitrous kit has a stand alone fuel system from nitrous outlet.

The nitrous works in first gear but in second and third, where there is more load, it starts breaking up at about 4500 rpms

I was told this is an ignition issue and that the spark is being blown out. I put new TR6 plugs in and had them gapped down to 20 and the problem did not go away. I ordered plug wires this morning to see if that is the issue. I don't have the funds to buy new coil packs so I hope it is the wires. From what I have read the stock coils can hold up to a lot more horsepower than I am making.

I was thinking about trying a smaller shot but don't want to have to go that route. Has anyone had this problem? Need some help guys.

This is on a 2004 SS Silverado.

I have been a member for a while and usually just search the forum but i am stumped.

 

Fellow OC guy huh? Who's tuning this beast?

 

what do you mean by breaking up? The nitrous stops working or the motor sounds like it is misfiring?

 

Kr or burst knock maybe?

 

ohh no, you got the wrong plugs for that shot and boost. you need a br7ef, and some piming pulled prolly. tr6 will turn into a glowplug and cause it to missfire/KR. hope you didnt hurt it!!!

 

I have been on the dyno 2 times with the nitrous. There is no knock and AFR is good. I swapped the jets this morning from 175 to 100 shot and it is still blowing out the the spark but it is not as bad.

I will try the br7 plugs next if the wires don't help. This was mentioned to me on silveradoss.com

Tuned by Church Automotive testing in Wilmington, LA county

Thanks for the help

 

I know churches is mainly an import shop. If you want email justin at blackbear. He's now is SD

 

Put the br7ef plugs in today and new wire's. we lowered the fuel pressure on the stand alone, tested the battery and alternator and put the 150 jets in. The plugs made a world of difference and truck is running much better. It is still breaking up a little bit but nothing like it was. I am going to order some 8's and see what happens.

 

try a tr7ix