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I was wondering just how useful is data logging when trying to tune a jet boat to its best? Say after its tuned, do you keep messing with it or take it off? Does it help when water conditions are different? IS it worth the investment? How do u know what the numbers mean? How much time will it take to make it useful when never ran one before? How much weight does it add to the boat?
Use it every pass. Very difficult to really know what is going on without it. Weighs almost nothing less than 5 lbs. It will take a while to get an understanding of what things mean and how to use them.
 

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Gary, I don't have a data recorder on my boats, but I don't race them either. However, I do use one on my sand drag car and couldn't race without it. We gather information such as engine rpm, driveline rpm, throttle position, fuel pressure, boost, and exhaust temps. In your boat you would want to add bowl pressures as well. I'm sure others will chime in on other useful data you would benefit from. So how's the boat coming? Steve
 

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i have been around the QD set-up the MPD set-up for my Friend.

i will be spending the Money as soon as my boat hits the water for my own QD system;)


i will more than likely not be racing my new boat(i can if i want) but they are the greatest tool to have for a jet imo.

otherwise you are just guessing at set-ups,ect.

Travis...
 

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Highaboosta
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IS it worth the investment? ?
Gary, you already made the investment.
Your EFI technology or Autronics ECU can datalog more stuff than you could ever need.

Not just engine info but anything with a 0-5 v signal, like a pressure transducer.
Pressure Transducer

I've heard of guys sticking a MAP sensor in the valve cover to monitor crankcase pressure and the Bonneville guys will stick one in the scoop to see if their getting positive pressure and datalogging those readings.

You can have it trip with throttle position, MAP, rpm, manual switch, whatever you want.
I have it so I just flip a toggle switch to arm it but it won't start recording until 3000 rpm.

Someday it would be nice if there was a way to tie the GPS into it too.
 

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Discussion Starter #8
Gary, I don't have a data recorder on my boats, but I don't race them either. However, I do use one on my sand drag car and couldn't race without it. We gather information such as engine rpm, driveline rpm, throttle position, fuel pressure, boost, and exhaust temps. In your boat you would want to add bowl pressures as well. I'm sure others will chime in on other useful data you would benefit from. So how's the boat coming? Steve
I talked to Tom yesterday to go over some things and one of the changes i made was to get rid of the giant fuel tank obstruction that sits right in front of the engine. I realize its necessary to provide the fuel volumn needed for an alcohol engine, but not needed with my e85 deal . Carson Brummet designed an auxilliary fuel tank that mounts on the front motor plate that feeds the primer pump, cv block mounted pump that feeds the little tank, and the tank gravity feeds the high pressure efi injector pump. It houses the pressure regulator, has foam inside to eliminate fuel bubbles, and has a screw on filter on the bottom of it. It makes it where you can put the fuel tank anywhere and the block pump will suck it right up. Now Tom is going to mount 2, 10 gallon side gunnel tanks to feed the block mount pump. Having baffles installed in the side tanks along with site tubes to monitor fuel supply in tanks. I think it will look better with the hidden side tanks and gives much more room to put more junk in front of motor if needed. gary
 

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What numbers are good and bad? What are we looking to get from the data?

I have taps at 2 O'clock and 5 O'clock on the pump suction housing. But I don't know what good numbers are.

If I were to tap the droop, what numbers would I be looking for?

Check Motec for a gps with 0-5 output. And digital output as well.
 

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Gary, you already made the investment. <BR>Your EFI technology or Autronics ECU can datalog more stuff than you could ever need. <BR><BR>Not just engine info but anything with a 0-5 v signal, like a pressure transducer. <BR><A href="http://www.transducersdirect.com/HeleoCart/ProductCategory/Pressure+Transducer(26).aspx" target=_blank>Pressure Transducer</A><BR><BR>I've heard of guys sticking a MAP sensor in the valve cover to monitor crankcase pressure and the Bonneville guys will stick one in the scoop to see if their getting positive pressure and datalogging those readings. <BR><BR>You can have it trip with throttle position, MAP, rpm, manual switch, whatever you want.<BR>I have it so I just flip a toggle switch to arm it but it won't start recording until 3000 rpm.<BR><BR>Someday it would be nice if there was a way to tie the GPS into it too.

I think in my circumstance where i have more than one engine, i might ought to just get a separate data logger that stays with the boat in case i change to another motor that does not have an ecu on it. That way my engine computer wont be married to the boat. Just cost more money.
 

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B1 Racing
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I was wondering just how useful is data logging when trying to tune a jet boat to its best? Say after its tuned, do you keep messing with it or take it off? Does it help when water conditions are different? IS it worth the investment? How do u know what the numbers mean? How much time will it take to make it useful when never ran one before? How much weight does it add to the boat?
Man, loaded question.

On something like yours (I've heard and read about it quite a bit) I would absolutly be looking at some kind of data logger. Boost, intake high, low, bowl and GPS or speed would be a good starting point, air fuel is neat too. Unless you've set up dozens and dozens of the same boat with the same configuration and you've dialed in the ones in the past with a logger then you could maybe get away without one but on something high end Id still have one on there. The amount of things we have found to be helpful through the data or caught from going wrong, or caught a failure before it happened are incredible, my logger has paid for itself many many times. When working on something sort of new or a new combination its a must have. With the Placecraft we really struggled with it in the beginning, data was a huge part of that boat just to get it going down the track and we still check it after each run wether its just to make sure everything is nice and healthy or to see what a specific change did. We are still fighting the intake pressure on the low side with it, its abnormally low for example and there a donzen other things Id like to try and make better once we get the basics dialed, all will be done through data.

My logger is always in the boat, if the ignition is on, its on and logging data if the pump is pumping water. Even when the boats setup perfect you still want it in there at all times. The data is still useful to see your still getting correct pressures, RPM is also a HUGE piece of information for racing, lets you know when your down on power from bad air or lets you know the thing is doing good from killer air, also a great way to know if maybe something is wrong in your engine. We really rely on vacuum readings with our drysumps or vac pumps, a sudden loss of vacuuum is not good and could mean ring seal went away. You can even see a bad tune up in vacuum, especially useful with n20 stuff.

Some of the things Ive seen the new Quikdata 2 do at the last few boat races are incredible, its not just a logger, we started using it to turn things on and off at certain pressure etc. GPS is on the boat and lots of other stuff thats still being developed Im not positive I can talk about becasue it may never take off, over all its a pretty neat unit, putting one on mine. Quikdata 1 was and is still a great unit but is beyond old school software and is now obsolete from my understanding unless you land a good used unit, those do work good and do the job but after working with quikdata 2 Ill never go back, ever. When Im racing I need something that transfers faster, its just too slow anymore. There will be a learning curve and it certainly does help to know your way around a computer a little bit but with a little patience you will love it.

There is so much to the loggers, hope that helps a little bit. If you have any more specific questions just ask, no problem.

Chris
 

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I have a more specific question.

What numbers are good and bad? What are we looking to get from the data?

I have taps at 2 O'clock and 5 O'clock on the pump suction housing. But I don't know what good numbers are.

If I were to tap the droop, what numbers would I be looking for?
 

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I've looked at loggers over and over again. It seams like most of the jet guys use the Quikdata unit but i've heard and read some really good things about the racepak units. Not only that but it seams like most of the NHRA guys seam to use them too. Anybody have any experience between the two?
racepak is a great product. we had one 11-12 years ago. worked great. but it's pricy. back then, for basic jet tuning, a basic QD setup from mpd was much more cost effective and affordable. both products have continued to improve over the years. while i've added a few things, i still use the same system i've had for 10 years. it's just a matter of deciding what data a person wants or needs, and doing due diligence in making their choice. either way, it's important to have a system that timesynchs everything. without that attribute (both racepak and qd timesynch everything), you're making assumptions.
 

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B1 Racing
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I've looked at loggers over and over again. It seams like most of the jet guys use the Quikdata unit but i've heard and read some really good things about the racepak units. Not only that but it seams like most of the NHRA guys seam to use them too. Anybody have any experience between the two?
Ive never delt with them personally but everyone says the same thing, get ready to pay when you want to upgrade your system. They have affordable or competitve pricing on entry level units but when its upgrade time be ready. Not the case with QD.

We just did a pretty basic QD2 in my buddys gullwing using a QD2 and it was about 2k and it was a simple deal, hook up 3 wires and the plastic lines, the way the data is presented on the screen is incredible, just like racepack, its all through USB so the data transfer is like instant, software is much more complex but it does way more stuff. Like Bp said just depends on what you need.
 
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