Venom VCN-500 Nitrous Kit
11-17-2004, 03:41 PM
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I spray a 200 wet shot all day long on an LS6, stock bottom end, but with rings and bearings. The safe/unsafe point is all relative. On an F20C, which uses a MAP sensor, a dry shot is a bit more safe - if there is such a thing. The MAP is a very accurate load sensor.
Injectors can be "overclocked" by increasing your fuel pressure, but not by much. The stock pieces can handle a 75 dry shot just fine, as long as the computer knows what's going on. Make sure you tap into the upstream O2 sensor.
As SMOOTH suggested, I would start with the smallest jets. Put your car on the dyno, hook up a scan tool, and freeze frame right before you spray. Pay attention to STFT and LTFT (counts and/or percentage), and particularly the injector pulse width. If LTFT gets past 10% in either direction, you're running way too lean or way too rich, and you'll probably get a CEL. Obviously, you'll need to back off on the nitrous, or at least tune it better. If LTFT doesn't max out at +/- 10% you can jump up the size of the shot in small increments.
You're using a WOT activation switch, and an rpm kill switch(?), but what are you using for your arming switch?
Injectors can be "overclocked" by increasing your fuel pressure, but not by much. The stock pieces can handle a 75 dry shot just fine, as long as the computer knows what's going on. Make sure you tap into the upstream O2 sensor.
As SMOOTH suggested, I would start with the smallest jets. Put your car on the dyno, hook up a scan tool, and freeze frame right before you spray. Pay attention to STFT and LTFT (counts and/or percentage), and particularly the injector pulse width. If LTFT gets past 10% in either direction, you're running way too lean or way too rich, and you'll probably get a CEL. Obviously, you'll need to back off on the nitrous, or at least tune it better. If LTFT doesn't max out at +/- 10% you can jump up the size of the shot in small increments.
You're using a WOT activation switch, and an rpm kill switch(?), but what are you using for your arming switch?
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