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Thunderjet Tuning

Discussion in 'Fuel / Air' started by alhall88, May 24, 2009.

  1. alhall88

    alhall88 UAW

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    Yeah I'm going to start again in a couple days because I need more jets. S&S does not make any jets between 33 and 36 and I should be running a 34 or 35. I called Zippers and they have those special sizes. According to Zippers I should be at a 34 or 35 int. with a 74 main. I'm starting to get some old weber carb deja vu going on
     
  2. MARV

    MARV Well-Known Member

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    no leaks?
     
  3. avdhunter

    avdhunter Active Member

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    Yea Al and those 34,35 & 36 are twice as much .... or they were when i found em! good luck man!
     
  4. alhall88

    alhall88 UAW

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    None I could find, I thought the same thing. I think I just need to stop thinking S&S tuning. I haven't even put the meter on it because I need to get rid of the flat spot first.
     
  5. MARV

    MARV Well-Known Member

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    being the machinist Al is, surprised he doesnt drill his own. :up:
     
  6. alhall88

    alhall88 UAW

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    I thought about it because I still have 2 small drill bit sets from when I had the weber carb and I had to drill my own jets then. But I want to be able to switch back if I had to. My jet supply is running low due to cheapskate friends keep using mine up.
     
  7. Chopper Dave

    Chopper Dave SIICK!!!

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    Al...what size jets do you need? to drill....my dad gave me a pack of jets from his G carb(I would have to see what sizes are in that pack he gave me) he had on his Harley...plus I also I the high end jet kit....give me a call and let me know and I will send you those jets.....
     
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  8. alhall88

    alhall88 UAW

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    Thanks Dave for the offer but I have them coming already but if I need more I 'll give you a shout.
     
  9. Chopper Dave

    Chopper Dave SIICK!!!

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    sounds good Al!:cheers:
     
  10. lee

    lee Well-Known Member

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    you'll get there Al
     
  11. alhall88

    alhall88 UAW

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    Well I did about 8 different jet changes today but I finally think I got it. This thing is really waking up now. I'm also more inline with what zippers suggests. I am now running a 33 slow jet, 74 main jet, and a 135 (.053) air bleed and a 120 thunder jet. I think I was underestimating the impact the airbleed has on the main jet. For example I needed a 80 main jet with a 155 (.061) airbleed. Just by dropping the air bleed I was able to drop down to a 74 main but then I had to up the thunderjet from a 100 to a 120. Now I can do some great 2000 rpm roll on's. I coast in second gear up to 2000 rpm's and punch it full throttle and break the rear tire loose. I can't get back on the dyno till the 16th of June so I'll wait till then and see if my lean condition at high rpm's is fixed. Hell I might have even picked up a couple pony's.
     
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  12. Chopper Dave

    Chopper Dave SIICK!!!

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    good to hear Al! hope you got the right recipe:up: :cheers:
     
  13. MARV

    MARV Well-Known Member

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    sounds great! :up:

    did you get the LM-1 on her yet?
     
  14. alhall88

    alhall88 UAW

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    Yeah but I'm going to kill myself with that fucker, I cant keep the bike rolling at 5000 rpm's and keep watching the meter. I think it works fine on the low and midrange but its tough keepin your eye on it while getting on it, and you need to maintain those rpm's for a few seconds till the air fuel levels out. I think when I get back to work I'll invest in the recorder as well. That way all I have to do is ride it all around then I can download the data after.
     
  15. Raywood

    Raywood The Pirate
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    :cheers: :2thumbs: :cheers:
     
  16. lee

    lee Well-Known Member

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    good work Al. I know what you mean about the LM unit too! Lethal. I tried to record onto a SD card but no joy. No idea how that works. Probably wouldn't have been much use anyway because I don't have the rpm cable.
     
  17. alhall88

    alhall88 UAW

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    Mines a little older unit s no SD card, but the internal memory can hold 45 minutes of data. But like you said unless you can associate the air fuel readings with engine rpm's the data is useless. You have to buy the "aux box" for the LM-1 that costs another $249.00 and then find places to hold 2 boxes when you ride.
     
  18. outdoorsman26

    outdoorsman26 Well-Known Member

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    how did this all turn out for you?? I am currently doing this mod to my carb and was wondering what jets you settled on??
     
  19. outdoorsman26

    outdoorsman26 Well-Known Member

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    just seen that AL hasn't been on here in a while does anyone know what jets they are running in there carb with the thunder jet?? I have stock motor w/600 cam and V&H pipes, thanks
     
  20. Wolfman Dan

    Wolfman Dan New Member

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    Hey Al, I'm curious if you are still on this forum. I know this thread is old, but I'm getting ready to install a S&S Super E already modified with a Thunder Jet. Could use all the advice I can get. I also have a Kuryakyn Super Charger Air Intake on mine. There is very little information about this combo. Any advice?
     

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