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Thread: New motor stumble from idle/WOT below 3K RPM

  1. #11
    Senior Member Carroll Shelby marshall_mosty's Avatar
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    Had a good day at the dyno. After 10 pulls trying to figure out why the MAF voltage was pegging at idle ended up being a bad jumper harness from Granatelli... Oh well. Fixed that and we were off and running. Ended up tuning to 381/395 before checking to see if SAE Smoothing 5 was selected. Of course, they are running their dyno on STD so it looks better for their customers. As soon as it was "reset", that number dropped to 347/359. We started pulling timing from the high points and ended up at 316/335 for my cert pulls. Water temps were 180/210/210, so it was representative of what I'm going to run on track. Also, it was pull #22-24 for the cert, so the motor and driveline were WELL warmed up.

    So, my new minimum weight is 3015. I'm expecting 2 45lb elevator plates to be added for ECR.
    Marshall Mosty
    AI/SI Texas Regional Director
    2011 NASA-TX American Iron Champ
    AI #67 "Mosty Brothers' Racing" (RIP)
    ST6 #21 Toyota Corolla (being revived)...

  2. #12
    Senior Member Grass-Passer Casey_SS's Avatar
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    Great results Marshall! Glad to hear you got the stumbling issue sorted out...gotta love that Granatelli quality If it's any consolation, they made and heavily marketed F-body MAFs back in the day which were notoriously problematic as well...I always thought they just hated Chevy's and were trying to help out the Mustang street racing crowd. Guess they're more of an equal-opportunity bunch than I gave 'em credit for.

    Mmmm....3015 race weight. I bet that car is just a hoot to drive....
    2012 NASA-TX American Iron Champ
    AI #29

  3. #13
    Senior Member Carroll Shelby RichardP's Avatar
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    Quote Originally Posted by marshall_mosty View Post
    a bad jumper harness from Granatelli...

    Hello!?! If you bought Granatelli parts you deserved to have problems. You don't have any other Granatelli parts on there, do you? Their suspension parts aren't as strong as the tie rod ends you made...

    Glad you got it worked out, though. Looking forward to seeing it on track. :-)


    Richard P.

  4. #14
    Senior Member Rookie
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    Marshall,

    Glad to see you're up and running! Jeesh, it would be fun to have two "tunes" so you can utilize all that HP on open track days! Who-hoo!

    All kidding aside, looking forward to seeing you back on track. My car ran well last weekend. Just had one weird rocker arm failure, but I've got a whole box of spares now!
    Last edited by way2neary; 10-01-2011 at 09:13 AM.
    David Neary
    Orange #23 AI Mustang
    2010 Texas Region AI Rookie of the Year

  5. #15
    Senior Member Site AdminCarroll Shelby michaelmosty's Avatar
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    Quote Originally Posted by RichardP View Post
    You don't have any other Granatelli parts on there, do you? Their suspension parts aren't as strong as the tie rod ends you made...


    Richard P.
    Hahahaha, that is the quote of the year!!!!!
    -Michael Mosty
    CMC #11 Mosty Brothers' Racing
    Director - TX Region

  6. #16
    Senior Member Carroll Shelby marshall_mosty's Avatar
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    All my MM parts are badged Granatelli...
    The new tierods are never going to die... 4130N and the same diameter as MM aluminum ones...
    Marshall Mosty
    AI/SI Texas Regional Director
    2011 NASA-TX American Iron Champ
    AI #67 "Mosty Brothers' Racing" (RIP)
    ST6 #21 Toyota Corolla (being revived)...

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