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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: Weber jets on a TA22
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Wed, 05 February 2003 14:28
 
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there is this thing you do, its called research. usually you go to www.google.com and type in something relating to your subject matter like "weber tuning" or "dcoe jetting", and you go and look up the rules of thumb yourself. you may also find a program called jetting.exe which is very helpful
tuning a weber is more than just fuel jets, you need to look at your emulsion tubes and air jets too, plus your idle jets if you are losing alot of fuel with just sedate street driving. then there are pump jets and chokes and aux venturii, find out how all these work before you go asking questions
your chokes are probably ideal for a 45, maybe a little too small which is a good thing (better to go too small than too big with sidedrafts). maybe try a 140 fuel jet, F9 tube and 180 air jet. idle jets maybe 45, i'm not sure. OR just whatever you're running now just keep buying smaller fuel jets (they're only what 4 bucks each) and/or bigger air jets until it feels nice
if you run too rich your car will bog and pop, if you run too lean it will cut altogether and get hot. the idea is to tune best LEAN at each throttle point. if you can get an EGO meter, about 12.7:1 is optimal power. 16:1 is your optimal fuel consumption ratio, so anything between those two numbers is great. on a carbed engine err on the rich side so you don't pre-ignite (ping), especially if you're still running factory dizzy advance
if you're willing to spend the time and cash setting it up properly (chokes for my dellortos are like $80/pair, i'm not looking forward to putting kits thru them) you can get a sidedraft to be responsive and perform across the entire rev range, unlike a downdraft which usually limits you to good performance in two of the 3 power areas (low, mid, high)
you've basically answered your own question anyway. too much fuel means you need less fuel and more air. learn how your carbs work, experiment yourself and get back to us
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| | Subject | Poster | Date |
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Weber jets on a TA22
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roadrunner | Tue, 04 February 2003 08:11 |
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Re: Weber jets on a TA22
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Super Jamie | Wed, 05 February 2003 14:28 |
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Re: Weber jets on a TA22
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5KinKP60 | Wed, 05 February 2003 16:00 |
