Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - Backfire KA-T Question

*Jeff240sx* · 02-07-2003, 12:09 AM

Ace: Why is removing the cat hard in an s14?... well, aside from the code that gets thrown. I did it "accidently". Also, how does the cat-removal fvck up an engine? On an NA it can, due to the loss of backpressure and burning out exhaust valves, but on a turbo setup, backpressure is the enemy of spool, and the turbo itself provides enough backpressure to keep the valves in check. I don't see a logic behind that.
Ichigo... what exhaust are you running? Are your plugs gapped correctly? Is your ignition system up to par? Actually.. what is your entire setup, from plugs (with gap) to wires to mileage? Backfires are a mass of not-completely burnt gas vapors ignition due to the heat of your exhaust. The incomplete burn has got to be fixed, and you'll free up power. I understand that you are running rich.. so either turn up the boost and use more gas, or get an awesome ignition system to burn the fuel as well as you can. Also.. there is a possibility that you don't need a system, as your wires/distributor may be bad, your plugs are probably fouled from running rich, and the turbo can blow out the spark in improperly gapped plugs.
Wow.. lotsa **** that can be wrong. Just post answers to my questions, and we can think from there.
-Jeff

02-07-2003, 12:09 AM	#5
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0)	Ace: Why is removing the cat hard in an s14?... well, aside from the code that gets thrown. I did it "accidently". Also, how does the cat-removal fvck up an engine? On an NA it can, due to the loss of backpressure and burning out exhaust valves, but on a turbo setup, backpressure is the enemy of spool, and the turbo itself provides enough backpressure to keep the valves in check. I don't see a logic behind that. Ichigo... what exhaust are you running? Are your plugs gapped correctly? Is your ignition system up to par? Actually.. what is your entire setup, from plugs (with gap) to wires to mileage? Backfires are a mass of not-completely burnt gas vapors ignition due to the heat of your exhaust. The incomplete burn has got to be fixed, and you'll free up power. I understand that you are running rich.. so either turn up the boost and use more gas, or get an awesome ignition system to burn the fuel as well as you can. Also.. there is a possibility that you don't need a system, as your wires/distributor may be bad, your plugs are probably fouled from running rich, and the turbo can blow out the spark in improperly gapped plugs. Wow.. lotsa **** that can be wrong. Just post answers to my questions, and we can think from there. -Jeff __________________ Whatup?