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  1. #1

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    Safe lean AFR readings at 5000-5500 rpm?

    Hi, trying to make my idle and wot leaner by fuel pressure regulator (tune has limits with the siemens ecu).
    What is the maximum safe lean levels between 4500 and 5500 rpms for cruising (14-16.5 afr)?
    At present, I am getting around 10 at idle 14-14.5 at 5000-5500 rpm and 9.6 at wot, the 7000-8000 rpm range is around 9 afr. Fuel pressure set to 50 psi and was going to try 48 psi. What is the safest lowest psi as well?
    Thanks

  2. #2

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    Quote Originally Posted by tiderider View Post
    Hi, trying to make my idle and wot leaner by fuel pressure regulator (tune has limits with the siemens ecu).
    What is the maximum safe lean levels between 4500 and 5500 rpms for cruising (14-16.5 afr)?
    At present, I am getting around 10 at idle 14-14.5 at 5000-5500 rpm and 9.6 at wot, the 7000-8000 rpm range is around 9 afr. Fuel pressure set to 50 psi and was going to try 48 psi. What is the safest lowest psi as well?
    Thanks

    na or supercharged? That is extremely lean. If supercharged aim for about 13.5-13 at that rpm. You are super rich on the top end, like foul out plugs rich. It looks like you need an appropriate tune as playing with the fuel pressure isnt going to fix all of it. At 14 afr mid range, I wont be riding that day, I know how that story turns out.

  3. #3
    Site Admin Green Hulk's Avatar
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    AFR in the 14-15’s is normal for 5000-5500 RPam

    your 9.8 at WOT is very rich.

    Your tune needs adjusting. You won’t be able to fix this with only fuel pressure adjustments.

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  5. #4

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    Quote Originally Posted by Green Hulk View Post
    AFR in the 14-15’s is normal for 5000-5500 RPam

    your 9.8 at WOT is very rich.

    Your tune needs adjusting. You won’t be able to fix this with only fuel pressure adjustments.
    The latest tune has stopped flooding the engine at start up with 50 psi instead of 58 psi. But runs 9.8-10.2 ish at idle, 14-14.5 at 4700-5500, 8.6 at 7-8K and 9.6 at WOT. There seems to be no way for it to be adjusted with the tune due to the 2007 siemens ecu at this point, we have tried numerous tunes. this is the ET137, 60lbs injectors, F1000, 4 inch with non restrictive air filter setup.

  6. #5

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    Pictures of the AFR sensor with about 6 hours on it.
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  7. #6
    connorrxp's Avatar
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    I'd check your oil level after running around at 9.5 more than likely you have gas in your oil, you can look into using a begi regualtor or change the fuel electronically with a cmd, but that's besides the point, that tune is all over the place. Boost doesnt come on untill 6k so you have some wiggle room below that but I dont run leaner than 13.4 if you want decent throttle response. With the cmd you can take out as much fuel or add as much fuel as you want over the base map


  8. #7

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    Quote Originally Posted by connorrxp View Post
    I'd check your oil level after running around at 9.5 more than likely you have gas in your oil, you can look into using a begi regualtor or change the fuel electronically with a cmd, but that's besides the point, that tune is all over the place. Boost doesnt come on untill 6k so you have some wiggle room below that but I dont run leaner than 13.4 if you want decent throttle response. With the cmd you can take out as much fuel or add as much fuel as you want over the base map
    Hi, I'll PM you. Thank you.

  9. #8

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    I've given up with trying to tune an ET137 +4mm spacer, 60 lbs injectors, 4 inch air, F1000 using the Riva tunes and MaptunerX with a 2007 Siemens ECU. There is no tune that came close or gotten better with trying different changes to them. The Siemens ECU does not work well with 60 injectors by the looks of it.

    I may just go back to a ET127+3mm and 42 injectors, Siemens ECU seems to work well with it. I put 30 hours of fun on that little wheel with no down time trying to tune it...

    Does anyone have a fuel controller unit available for 2007/Siemens ECUs for sale? Perhaps Power commander V, with power commander auto tuner, Power commander wideband 2 and the POD-300.
    Or a CMD with LCD-200 Thank you

  10. #9
    Mod less, ride more! troyheb's Avatar
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    Why are you running 60lb injectors with a 137x4? I ran 48's with my rrfpr set at about 40 psi at idle when I ran one in my 08 Rxpx with a Riva ECU. My afr's were perfect.

  11. #10

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    Quote Originally Posted by troyheb View Post
    Why are you running 60lb injectors with a 137x4? I ran 48's with my rrfpr set at about 40 psi at idle when I ran one in my 08 Rxpx with a Riva ECU. My afr's were perfect.
    I was told by a riva consult that 60 lbs would work best for a 137 set up.

    Would 48lbs injectors work with a 2007 siemens ECU?

    What brand or make of 48 injectors would work for a 2007 set up? Thanks

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