Nitrous Activation Accuracy ???

[DOHC Vobra]

Craig (or anyone using the Nitrous Function on FAST)... I'm using the Nitrous function on my FAST to trigger the runner controls on my 97 mustang, for those that are unfamiliar with this, there are a set of butterflies in the second intake valve runner that close down at low RPM to promote more velocity on the primary intake valve of each cylinder. Anyway, the stock ECU used to open these butterflies at around 3500RPM. I've setup the nitrous activation to come on at 3500 RPM, and have it constantly "armed", and have wired the nitrous control output to the runner control circuit. I was hoping that when it hit 3500, they would open, and then when the R's go back below 3500, they would close. This does seem to be happening, but the activation window seems a bit sloppy, especially with the "deactivation" part, they don't seem to close down very promptly when going below 3500RPM... Does anyone know how quickly the nitrous activation/deactivation actually occurs around that target RPM???

Thanks!
Justin
'97 Mustang Cobra
http://www.guieectuner.com
http://dohcvobra.corral.net