Unlock the secrets of your jet drive!
MPD has adapted the Qwikdata System for capturing information about your:
Jet Drive, Boat and Engine
MPD has adapted the Qwikdata System for capturing information about your:
Jet Drive, Boat and Engine
These systems can be seen in action at NJBA races on the following boats:
Jerry Hicks' UFJ record holder, CP 19 tunnel, "Hot Tub"
Joe LaKamp's SJ, sub 9 sec, CP 18 gullwing, "BobSnipper"
Ron Segni's SJ & 9.00 champion, CP 18 gullwing, "2nd to None"
Jim Burrows' CJ Champ, CP 19 tunnel, "Rat Bastard"
Mark Roznos' 9.00 bracket, CP 18 gullwing, "Sweet Thunder"
Phil Magana's 9.50 bracket, CP 19 tunnel, "MisFit"
Brett Anderson's 9.50 contender, CP 19 gullwing, "Low Profile"
Marty Stretch's 8.35 sec/129mph, Daytona 21, "Stretch Limo"
Bob Prigmore's 10.0 sec contender, Southwind 19 tunnel, "Abracadabra"
Jak & Debbie Young's PE class, Brendella 19, "Black Mamba"
Henry & Carol Morris' fleet of East Coast drag boats
Away from the races, systems are in use on the 21ft Daytona, "Turkey Lips II", and MPD's own 21ft Hallet test mule.
What data to collect? Try some of these: keel pressure, inlet presure, bowl pressure, boat speed & acceleration, nozzle velocity, battery voltage, engine rpm, Jetaway rpm, pop-off valve trigger, cooling water pressure & temp, oil pressure & temp, fuel pressure at pump & carb, exhaust gas temp, air/fuel ratio, crankcase vacuum, manifold vacuum & boost, WOT, N2O pressure, N2O fuel pressure, N2O on/off, and .........
What data do we recommend collecting? Start with the jet. Go for inlet pressure, bowl pressure and boat speed. Those three are what a performance-minded jetter needs to know when trying new jet parts. Acceleration, rpm and battery voltage are gathered by default. Regarding the engine, we suggest you first optimize your powerplant on a dyno. This is the quickest and most efficient way to do the job. After that you might run checks on any of the engine systems - fuel, lubrication, cooling, etc. If the engine uses a vacuum system on the crankcase in conjuction with very light tension oil rings, then a vacuum monitor is very useful to keep track of ring seal. Of course nitrous equipped engines benefit from careful observation of the bottle pressure and added fuel supply.
Once you see these parameters charted at 50 to 500 times per second it's hard to go back to looking at the old guages and tach. Those antique instruments miss most of the interesting events that happen in your jet boat's systems.