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Thread: Rich AFR

  1. #1
    monaroman76's Avatar
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    Rich AFR

    Hey guys, finally got to take my ski for a good run after replacing the HG. It was pulling really hard and I didn't have an issue with it all day.
    However I am only seeing 8120rpms with the 87mm stock nozzle, I was expecting to be on the limiter.. My lc1 gauge is showing 11.0 at WOT. Now I realise this is rich, but is it rich enough that it would affect performance?
    This was on a 70degree day with 80degree water temp, and high humidity..


  2. #2
    monaroman76's Avatar
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    I was thinking that maybe the lc1 isn't calibrated correctly, as I am very surprised to see the ski is soo rich at WOT. Idle Afr is showing mid 13's and cruise is mid 12's

  3. #3
    Mod less, ride more! troyheb's Avatar
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    Yes, that rich wil hurt performance. Get a rrfpr and dail it in.

  4. #4
    monaroman76's Avatar
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    I was nearly thinking the afr's would be closer with the stock 42's, maybe I should try the 42's with rrfpr..

  5. #5
    home of the dislexic fingers breon's Avatar
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    increasing the fuel pressure with boost will make it even richer...11 af .if you get it to 11.7 11.8 you will pick up about 300 rpm....

  6. #6

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    Throw the 42's back in and try it. I've heard bigger injectors or rrfpr aren't needed with a improvement of just a new impeller wheel. Never hurts to try. If that doesn't work, then get the rrfpr with the 42's. Let us know what you find out

  7. #7
    sniper300's Avatar
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    That doesn"t suprise me as you are in South Australia!!!! Weather is similar to here in Perth and i noticed the same with my ski aswell in this summer heat. I would put the RRFPR in and try the 42"S with that XX you have . My Bkit (14.5 psi) would run just right with 42"s in Summer but i had to put the 48"s back in for winter!!!!!!

  8. #8
    Mod less, ride more! troyheb's Avatar
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    I am running 48's with just a Riva X sc upgrade and a rrfpr with not as much boost as you and I was able to set my fuel pressure to get my afr's correct.

  9. #9
    Mod less, ride more! troyheb's Avatar
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    Never mind. lol I am running a Riva ecu. I thought you were too.

  10. #10
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Hey guys, finally got to take my ski for a good run after replacing the HG. It was pulling really hard and I didn't have an issue with it all day.
    However I am only seeing 8120rpms with the 87mm stock nozzle, I was expecting to be on the limiter.. My lc1 gauge is showing 11.0 at WOT. Now I realise this is rich, but is it rich enough that it would affect performance?
    This was on a 70degree day with 80degree water temp, and high humidity..
    Get your wot AFR to arround 11.7 and you will pick up rpm.

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