We have had excellent results on a number of different vehicles, beginning in '91.
Heard back from a Ford tuner and his customer yesterday.
Customer installed an eight channel Vampire a couple months ago on his '04 Mustang Cobra with KB blower and 17 psi pulley. Adjusted sensitivity to about mid point, and unit would briefly detect at the gear change, then go out.
Customer trailers the car 600 miles to his tuner. Sort out a problem with the boost bypass system, then make a clean pull on the eddy current dyno, no knock detections, senstivity unchanged.
Tune is for 93 octane, 17 psi, 18° timing, A/F was high 11's.
Change to 19 psi pulley and 105 octane, bump timing to 21°, set A/F to 12.0.
Unit now detects at torque peak. Experienced Ford tuner declares it must be false knock, since they are running 105 octane.
Tuner sets J&S sensitivity to minimum, no detections, car makes 590 rwhp, tuner and customer happy.
I contend that J&S reacted to inaudible trace knock. Maybe not be enough to damage the engine, but it's there.
I've heard many people disparage our system. "Oh, it has to knock before it does anything, and by then it's too late." I doubt these people even use a set of headphones to tune with. Even if they did, the J&S reacts to knock they can't hear in the head phones.
I know a tuner that uses our system, and his day job is an electrical engineer. He built his own knock amplifier with Bose noise cancelling headphones.
Here's a quote from a post he made:
Now moving on to the headphone users... I've personally built a couple units myself for use with noise canceling head phones and have added various levels of filtering and so forth. Simply put, the JandS id'ed and corrected detonation well before it was ever to a point of being audible and distinguishable to my ears. In other words, it was typically much higher level detonation. Keep in mind that by the time most detonation is audible a considerable amount of high level detonation has already taken place. Apparently John's algorithm is sensitive enough to detect it based on my experience. For those that will immediately jump on me to cry wolf that the JandS was false triggering... an adjustment of 3-4 degrees of timing on my EMS eliminated all triggers from the JandS and when added back in yielded the same response from the JandS. Again there was no hope or prayer of hearing this detonation through the head phones by any stretch. I tried quite a bit and ran numerous experiments to see if I could hear the detonation. So again, while headphones may work great (and do!) for hearing detonation in some cases, the underlying fact is there is considerable detonation occuring at high levels that are inaudible amidst the engine noise that the JandS is identifying successfully.
The above was from post 27 of this thread:
http://forums.nasioc.com/forums/showthread.php?t=831718
JohnP