Searched forum but couldn't find too much detail on weber tuning information.Searched google and found some interesting links to tuning and choosing weber dcoe carburettors.

Links:

http://7faq.com/owbase/ow.asp?HowDoI%2FTuneWeberCarburettors

http://www.pumaracing.co.uk/Chokes.htm

http://www.gglotus.org/ggtech/carbjetting/carbjet1.htm

Even though no two engines will produce the exact hp could some of the forum members that are using twins webers be kind enough to post up their dyno hp and torque figures and list of modifications of their setups etc for their NA motors and especially the A series.This would help some of us who haven't undertaken the process of choosing the right size webers for different applications.

quote from first link,
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From the links, expected bhp figures could help in choosing the right main venturi sizes.And tuning has been "stressed out" to be very important and things like the wrong choke sizes etc can even affect engine life.(running very rich,oil leaks).

so any dyno sheets or links to some would provide valuable data as to how a similarly modified a series might run.

The last link was also very informative on how to tune.i.e using a portable exhaust gas analyzer like one sold by gunsons and how to try and evaluate the data you get from its mixture map.Going to a dynamometer tuner etc.


Cheers

link to New Gunson Gastester exhaust gas analyzer tester for sale on ebay
http://www.ebay.com.au/itm/Gunson-Gastester-exhaust-gas-analyzer-tester-/280681199112#ht_2512wt_1139

i'll be definately be buying one of this units in the future.Are there any local dealers of this units in oz?

cheers

The Gunson-Gastester product im sure is good, but it is hard to beat the AEM wideband air fuel ratio gauge. they are compact and 12V powered so you can have it mounted in your car for real time AFR measurements, for those without a dyno.

AEM wideband

One good rule of thumb with webers is "if in doubt with the choice of the calibrated parts, choose the smaller one" Many a time have I seen webers with chokes way to big that gas speed are near non existent and idle and main jets that are too big for the application.

Very true, if in doubt choose bit smaller

Thanks for that link AEM wideband air fuel ratio gauge benny.I will research more into it.How would you interpret from the AEM wideband air fuel ratio gauge which "better" size chokes to use across the whole rpm range?

The weber book has what you're looking -- how to choose the correct carburetor size.

Here's the chart from the book. I recommend you buy the book for the explanations.

Carburetor Sizing
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PM sent

The gauge has the ability to output data [A/F ratios to a pc]. this can be cross referenced against rpm to indicate lean or rich at particular conditions. Having an understanding on how a sidedraught carb operates is always an advantage as well.

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The one I referred to is 'Weber Carburetors Owners Workshop Manual' by Haynes UK.




I borrowed this excellent book from the library.

thanks ssskiwi ,benny n ddgonzal.I will definately buy that book.thanks for links guys.that info is very appreciated.