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  1. #16
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    Quote Originally Posted by darkdream View Post
    Thanks so for 100% both 1.1 and 1.3 require same mods just air temp senor replacement? And cowl mod. This is the fuel rail mod someone told me. Souds like a good idea. Attachment 428000
    I don't know why mercury does that but Don t think it's fuel cooling because it's on one side of fuel rail. Optimax 250-300 has compressor water supply bypass fuel rail. 200 225 has water supplied from fuel rail

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  3. #17
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    Temp sensor is moved. Not replaced.
    [IMG][/IMG]

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  5. #18
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    You are right yesterday I moved mine hopefully the good position. Thanks for all the reply'sClick image for larger version. 

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Views:	18 
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ID:	428240Click image for larger version. 

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ID:	428241
    Boat: Hydrostream virage
    Engine: Mercury 300 XS
    Prop: 32' performance drag4 /34' custom spinelli dr4
    Speed: 109mph

  6. #19
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    My 2005 250xs's have the fuel rail water hoses hooked up when I bought them
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Screenshot_20190116-122622.png 
Views:	13 
Size:	3.61 MB 
ID:	428254  
    Aaron
    1991 Fountain 31TE, 2005 Mercury 250xs

  7. #20
    Join Date
    Aug 2010
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    Barrie, Ontario, Canada
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    Quote Originally Posted by darkdream View Post
    You are right yesterday I moved mine hopefully the good position. Thanks for all the reply'sClick image for larger version. 

Name:	IMG_20190115_140433.jpg 
Views:	18 
Size:	395.5 KB 
ID:	428240Click image for larger version. 

Name:	IMG_20190115_135734.jpg 
Views:	14 
Size:	413.3 KB 
ID:	428241
    I thought the 1.1 update removed the sensor and the 1.3 update required the sensor be installed back in?? Can someone please confirm.


    Triad V21 #002 - 15in DBR 300 xs
    19' J-Craft - 175 Opti
    18' Pontoon - 115 CT 4S

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  9. #21
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    I have a 250 and just did what Joe told me. Only one option for 250
    [IMG][/IMG]

  10. #22
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    Thanks I hope somebody can confirm heard the same but not sure. Tried to get in contact to dbr by mail but think to busy. Don't know what happen if run temp sensor out when have to be in? Temp out is more rich? Dont want to kill my engine due a simple mistake...
    Boat: Hydrostream virage
    Engine: Mercury 300 XS
    Prop: 32' performance drag4 /34' custom spinelli dr4
    Speed: 109mph

  11. #23
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    You will be fine running sensor out.

    Fyi that is not a true air intake temp sensor it's a coolant/water temp sensor. It's just there to give a reading too calibrate fuel mixture.
    So in theory now that you removed temp sensor it should be more cooler because it doesn't have heat transfer from intake plenum now which should make engine run little richer.
    If you have doubts pull couple spark plug before and after to read fuel mixture

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    Likes darkdream, noli liked this post
  13. #24
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    Tenkiller Lake, OK
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    Quote Originally Posted by 2jz View Post
    You will be fine running sensor out.

    Fyi that is not a true air intake temp sensor it's a coolant/water temp sensor. It's just there to give a reading too calibrate fuel mixture.
    So in theory now that you removed temp sensor it should be more cooler because it doesn't have heat transfer from intake plenum now which should make engine run little richer.
    If you have doubts pull couple spark plug before and after to read fuel mixture
    It is an Opti. The computer will compensate for any rich (or lean) condition. The re-positioning of the temperature sensor is to keep the sensor in ambient air, not heat soaked by the intake manifold aluminum after a bit of time which gives the ECM inaccurate air temp data. That way the temp input data to the ECM will be the temp of the incoming air, not the temp of the aluminum of the manifold. This info according to DBR and common sense engine input/output sensor/ECU parameter knowledge.

    Both the 1.1 and 1.3 recommend the sensor re-positioning for this reason. All the hype about the DBR tune (re-flash) is very subtle, if at all noticed without a dyno (adjusted to fit the message from DBR ), IMO. Just little tweeks like the sensor re-positioning, a higher rev limit, etc. are gained by the DBR tune. If you study the HP and torque curves of an Opti, you will notice max HP and torque well below the stock rev limit, so raising the rev limit accomplishes little to nothing. You engine should be propped to "OPTI"mize the max. HP and torque in that sweet spot or your missing the "boat". Mother Mercury is hard to beat in the R&D - HP extraction game!

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