| Author |
Message |
    
Carlost
| | Posted on Tuesday, February 12, 2002 - 05:48 pm: | 
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Wow! This totally makes up for my Buell race ignition module snafu from a while back. :D |
Aaron
| | Posted on Tuesday, February 12, 2002 - 05:51 pm: |
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Hey, when I'm so arrogant that I think I can't learn something, slap me upside the head, okay?
Thanks for (once again) making me curious enough about something to go looking for the answer. |
Sem1
| | Posted on Tuesday, February 12, 2002 - 10:40 pm: |
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Aaron: Thank you very much for the excellent information. I guess the next time I have the carb off the bike I will put the NOKK back in.
Say, if you ever find yourself wondering what next to throw on that wonderful dyno of yours, it would be really interesting to see how the different needles compare when (optimally) shimmed. :-)
Cheers,
Semi |
Oz666
| | Posted on Thursday, April 25, 2002 - 04:05 pm: |
|
If one was testing the effect(s) of the needle, which primarily governs midrange metering, wouldn't one want to do pulls with a mechanism which would provide positive throttle plate stops at 30, 45 & 60 degrees opening? The pulls above really only show WOT where, as soon as there is sufficient airflow (very quickly), the slide rises to the top and the metering would not be much different than using a "needle" with a constant diameter the same as the narrowest point of the needles being tested.  (I have not watched the slide on a Buell being dynoed, but other bikes I have seen/watched w/o the air cleaner pull up the slides almost instantly.) |
Aaron
| | Posted on Thursday, April 25, 2002 - 06:31 pm: |
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Watch a CV slide on a Buell sometime. While under load, doing a dyno pull, with the throttle wide open. It comes up slowly. |
Chrism
| | Posted on Friday, April 26, 2002 - 05:59 am: |
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Aaron, at what point though is the needle all the way up? Working on my '72 Datsun 240 z, the needles were all the up by 4 grand on a 6800 redline. Also, wouldn't the needles have a more specific effect on A/F in constant cruise at say 38 to 4 grand?
Chris |
Aaron
| | Posted on Friday, April 26, 2002 - 09:05 am: |
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Chris: The idea here was to look at the shape of the a/f curve generated by each needle. I did not attempt to estimate needle position at any particular rpm, the a/f curve tells the story. |
Oz666
| | Posted on Friday, April 26, 2002 - 09:10 am: |
|
OK, thanks Aaron, as I said I had not had the chance to observe personally. It also tells me several things:
1.) the stock carb is large enough (or close - esp. looking at your carb change dyno numbers [thank you]) to feed the motor in standard trim.
2.) playing with the size of the slide hole may be helpful, if done carefully.
3.) the needle taper affects metering over a wider range of throttle opening/RPM than I had assumed.
4.) change main jet first.
5.) change main jet first.
6.) change main jet first.
7.) ALWAYS ask, never assume. |
Used_96_s1
| | Posted on Tuesday, July 29, 2003 - 03:42 pm: |
|
According to the folks at Dynojet, their kit replaces the main jet tube due to the fact that the stock tube causes some incongruencies(sp)in the air/fuel ratio world, specifically, the problem of having to run a larger main jet for acceleration that leaves you rich at the top end.
This I do know; when I installed my Thunderslide kit, I went from the Keihen 195 main to a Dynojet 170 main and I'm not 'popping' under full throttle. I do however need to raise the needle a little because I'm 'popping' just a bit at 3/8ths (cruise)throttle. |
Moody_blue
| | Posted on Sunday, March 20, 2005 - 07:48 pm: |
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After reading the above post's still ask,
For my 2002 M2 I have:
Hypercharger, Staintune exhaust, calibration kit for stock carb.
Carried out carb changes as per instructions but is there a recommended list for set-up from more knowledgeable members, ie 195 main (was not happy with the 180 main), 2.5 idle etc etc when used with various combinations? Also at sea level (Melbourne Australia).
Any help much appreciated
Jeff |
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Dyno Test Results - CV needles
