justincat wrote:
Hello, I have a fox body with 351w, forged pistons, aluminum heads, about 10 to 1 compression. I had my initial timing at about 14 btdc. I just added 100 shot and I had to pull my timing all the way to 6 btdc before the engine would stop making the knock sound. Has anyone had to pull so much timing just for 100 shot? Is there anything I could do to help with the knock, I was really wanting to run a lot more nitrous down the road and don't think I should be pulling more timing from the distrubuter. I have just been tuning the engine with mph and by looking at the plugs. Maybe mixing race gas? Has anyone ever run a larger fuel jet then recommended in the kit? thanks in advance. Im new to nitrous and have a lot to learn as far as the tuning goes
Generally, not much ignition timing needs to be pulled on such an engine. However, there may be a few items that could contribute to your issues such as the type of piston used (sharp valve reliefs), too hot a spark plug, fuel quality, fuel octane, lean nitrous ratio, etc.
Could you provide more details about the kit and the engine build? It would be of fantastic help.
