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Registered User
Join Date: Jul 2013
Posts: 4
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Performance Weber 40 IDA 3C
Hello.
I have a Weber 40 IDA 3C. I would like to improve their response and power but do not know what should I change jet and venturi. Number- 70, 71, 72, 73, 73  Thanks |
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09-17-2013, 12:14 PM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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What car? what engine build spec? What are your current jetting specs including idle jet, main jet, Air correctors, emulsion tubes, venturies?
If the car is jetted properly and you have good AFR there is not much you can improve. What exactly do you want to do? Your comment about response and power is vague at best. Properly setup webers have fantastic throttle response and make very good power.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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09-17-2013, 01:25 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Timing could be the issue since Webers have no place to connect vacuum lines for the advance/retard on the distributor.
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09-18-2013, 01:43 AM
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Slippery Slope Expert
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This a VERY open-ended question. To do it right you need to have at very least an air/fuel ratio meter (one you can drive down the road with) or a chassis dyno. Then a lot of parts to play with.
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09-18-2013, 03:44 AM
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Registered User
Join Date: Jul 2013
Posts: 4
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I sit it do not have idea great on this topic and not wise that to put.
Car: Renault Alpine A310 V6 Motive: V6 PRV idle jet: 55 main jet: 125 Air correctors: 180 emulsion tubes: F26 venturies: 30 Thank |
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09-18-2013, 03:47 AM
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Registered
Join Date: Feb 2008
Posts: 1,438
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The A310 is similar in displacement with a carburetor equipped 2.7 in the 911s. The engine probably has power output similar to the 2.7 since the V6 A310 was capable of 140MPH (230KPH) performance. Assuming this is true then jetting for this engine would look like this:
Performance testing would be necessary to confirm jetting sizes but the 34mm venturis and the F3 emulsion tubes will work for all jetting combinations. If a little less top end power is desired then 32mm venturis and 135 mains would be the choice to start with.
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Paul Abbott Weber service specialist www.PerformanceOriented.com |
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09-18-2013, 06:52 AM
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Registered User
Join Date: Jul 2013
Posts: 4
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Thank you very much for the reply. The truth that what I expected and needed.
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09-19-2013, 11:43 AM
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