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  1. #1

    43mm Throttle bodies on ported 1300

    Mike in Australia tested a set of 43s on his Lowell ported 1300. Several have asked me about the performance gains on a 1300 and this is the first time a set has been on a ported 1300.
    Here is his pm to me word for word.
    Ross
    --------------------------------------------------------------------------

    Hi Ross
    Got a chance to test the 43s this morning i ll have to say you can feel the difference straight away. It has more through the bottom and mid range pulled quicker and has more pull and response ill say.
    On top i only gain a solid 20 to 30rpms and speed was the same if anything little lower. My best today was 78.5 to 79.6 pulling 7220rpms.

    With the 40s alway pulled 7180 7190rpm 79.5 to 81.3mph but this could be the weather current in the water so on. I had a nice day today its was 6am and was about 20 degrees no wind blowing still as.

    One thing that is different is the EFI controller setting s with the 43s i had better colour on the spark plugs and felt i could lean it off more but was to afraid to.

    I ended up with 7 10 7 6 with the 3rd pod i am sure it would of run at 5 but was nt game with it. With it set at 7 i have better colour on my plugs than the 43s wow. I ran the 3rd pod on 6 for a quick burst made the rpms get to 7180 and did a plug chop straigh away and they looked really good still where tanny in color. Speed runs where done over 400metres straigh

    SO really hard to give you feedback on top because the ski did nt go faster but did pull more rpms 30 more rpms but the bottom and mid did pull harder for sure.

    Still deciding what to do with them i was expecting more rpms up top.
    I ll have to give them the thumps up i liked them for sure more all round.

    Mike


  2. #2
    Forget to mention this was a comparison between his 40mm sonic booms and 43mm sonic booms.

  3. #3
    Mik72e's Avatar
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    I am not done testing yet.

    Will be checking WOT position as I installed the 43 TBs the way i got them from Ross it looked pretty close to me so getting someone with more experience to have a look/adjust for me.

    I do think theres more rpms at WOT to come hoping to get another 20rpms then ill pitch up on my prop see how we go.

    I need to spend more time getting them dialed in.

    Hopefully will have results next week.

    Thanks Ross

  4. #4
    Chine Walker
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    Ross:
    One thing I never see anyone mention is how to adapt the intake temp sensor to the Sonic Booms??

    Regards,
    jp

  5. #5
    Quote Originally Posted by jpa1300 View Post
    Ross:
    One thing I never see anyone mention is how to adapt the intake temp sensor to the Sonic Booms??

    Regards,
    jp
    You simply tie strap it to the fuel rail. Several including Jim have done just that with great success.

  6. #6
    Chine Walker
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    Can the sensor tip be installed on the forward most trumpet, by drilling a small hole??

    jp

    Ps. Ross is there anyway to install a protective airbox assembly around the trumpets for those who ride in heavy surf??
    Last edited by jpa1300; 01-28-2008 at 10:52 PM.

  7. #7
    It could be done, but its not necessary..

  8. #8
    WATER WOODY's Avatar
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    My season is getting closer Ross.I will be testing the 43's on my 1400 ported Monster. Come on summer!!!!!!!!

  9. #9
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by jpa1300 View Post
    Can the sensor tip be installed on the forward most trumpet, by drilling a small hole??

    jp

    Ps. Ross is there anyway to install a protective airbox assembly around the trumpets for those who ride in heavy surf??
    No need to drill Ross is correct just tie strap the sensor to the fuel rail.

  10. #10
    Autosport's Avatar
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    Quote Originally Posted by jpa1300 View Post
    Can the sensor tip be installed on the forward most trumpet, by drilling a small hole??
    Wouldn't this defete the purpose of the trumpets (ie: would create turbulance and disruption in the air flow?

    Quote Originally Posted by jpa1300 View Post
    Ps. Ross is there anyway to install a protective airbox assembly around the trumpets for those who ride in heavy surf??
    This would also defete the purpose wouldn't it?.. trumpets are all about maximum air flow, anything to stop water getting in would be restricting air flow and air speed in some way

    PS: Mike rides rough water here in Australia as well... doesn't seem to worry him?

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