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  1. #1

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    m130 sensors EGT tunnel pressure

    Anybody hooked egt up to motec for datalog?
    Need egt sensor and hookup????

    Tunnel pressure sensor & hookup?

    Motec has so many capabilities tryin to use some


  2. #2
    The most interesting man in the world. Nils888's Avatar
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    Quote Originally Posted by rxpstan View Post
    Anybody hooked egt up to motec for datalog?
    Need egt sensor and hookup????

    Tunnel pressure sensor & hookup?

    Motec has so many capabilities tryin to use some
    Hay Stan.

    All you have to do is put the sensors in the ski. I can tell how to set them up.

  3. #3

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    Do you sell the sensors and hook up adapters?

  4. #4
    The most interesting man in the world. Nils888's Avatar
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    Quote Originally Posted by rxpstan View Post
    Do you sell the sensors and hook up adapters?
    yes

  5. #5
    Hi nils !! Where is motec EGT sensor put location is good ????

  6. #6
    JT jpt7779's Avatar
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    Quote Originally Posted by rxpstan View Post
    Anybody hooked egt up to motec for datalog?
    Need egt sensor and hookup????

    Tunnel pressure sensor & hookup?

    Motec has so many capabilities tryin to use some
    Yep, I added both EGT probes & logging, and pump tunnel logging and live monitoring! Only can a Motec M130 be so versatile! Gotta love it…and the support from Nils has been nothing but superb!

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    The EGT Thermocouplers, yellow quick connectors, a single amplifier, and a dual amplifier all came from http://www.exhaustgas.com. I had Nils modify the M130 harness to accept the EGT inputs and a pump tunnel pressure sensor. You only have this ability to add these 4 sensors (5volts) using a LTC for O2 logging on the current harness.

    The tunnel sensor is setup to log on the M130 and I T'd off of the hole to view it live with a Innovate sensor and square LCD gauge. I plan to remove the Innovate sensor and gauge once I know I won't get stuffed anymore.

    The inside hull picture is showing the T sensor setup and my custom PRV's. I drilled and tapped the PRV's, and tunnel sensor at the same time.

    I will get a screen shot of the EGT log and tunnel pressure logs of a recent run.

    Bottom line is with EGT readings you can fine tune your Engine Efficiency chart, knock, timing, Lambda, fuel aim, etc. etc.

    Typical temps at 8800 rpm, 81-83 mph, 35* timing is around 1600-1650* F. I have seen as high as 1720*F when too lean and have since played with fuel aim, Lambda, and timing to keep it around 1600-1650*F.

    The other interesting thing is cylinder 1 is always 30-50* cooler than 2 & 3 and cylinder 3 is the hottest. You can equalize the temps by adding 1-2% of fuel to cylinders 2 & 3 in the fuel trim table……too easy. I bet money that all the guys that burned up a piston that it was most likely #3.

    The tunnel pressure at 81-83 mph is normally 34-38 psi with my PRV's. I know from Glade Rider that near 50 psi your looking at a yard sale of your junk!

    Just another set of tools to keep an eye on things and tweak your tune as desired.

    Much thanks to Nils and Evan Kassing for their expert advice!

    JT





    Last edited by jpt7779; 05-30-2014 at 05:54 PM.

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  8. #7
    JT jpt7779's Avatar
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    Click image for larger version. 

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    This screen shot shows exhaust lambda of .78 which is (14.7 x .78 = 11.61 AFR)
    EGT cyl 1, 2, and 3 in degrees F 1553, 1605, and 1601 with peaks of 1575, 1657, and 1647
    Jet Intake Pressure sensor 34 psi peak of 47 psi
    engine load
    engine speed 8769 rpm
    engine run time since logging 65.6 minutes

    A keen eye will see my note about 37* timing at the top, as I was running AvGas 100LL, more timing cooled the EGT…..but this was a very hot high humidity day causing lower AFRs.

    very cool capability!


  9. #8
    GRF + DashPac:) seadoo02xp's Avatar
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    Very cool stuff!! Something else that's handy with watching egt is when you feel your spark plugs foul and rpm comes down you can see which cylinders spark plug is fouled by watching it cool off. You will see the tune go rich on lambda also. Something that a few years ago was just a guessing game as to why rpm was dropping of a motor was cutting out. Now we can just look at a log.

  10. #9

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    Fantastic info JPT! I don't have the EGT probes yet... but I do have pressure sensors for the fuel and pump tunnel.

    How did you mount your pump tunnel sensor? Looks like maybe you have a washer glued down?

  11. #10
    JT jpt7779's Avatar
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    Quote Originally Posted by DinoMite View Post
    Fantastic info JPT! I don't have the EGT probes yet... but I do have pressure sensors for the fuel and pump tunnel.

    How did you mount your pump tunnel sensor? Looks like maybe you have a washer glued down?
    Drilled and tapped NPT fittings, the washer is just a spacer to keep the fitting flush on the water side. Used 3M Marine 5200 white sealant. Pics are worth a thousand words.

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