GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: davidhawkins_78 on 21 November 2003, 11:36
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Hey peps - Been offered a throttle body of a 2.2 Audi for my 8v digi and I was wondering what else I need to make the change.
Someone mentioned warm-up regulators, is there anything else I should know ??
Cheers for your help guys ( and gals ;) )
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a digi wont have a warm up regulator
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Lol ..obviously I'm showing my ignorance with this engine here!
So should it be a straight swap with nothing else to worry about ?
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wasnt to sure on the throttle body, so i managed to dig this info up:-
There are two main areas to bare in mind about swapping throttle bodies, the overall area of the two throttle plates and the relative sizes of the primary and secondary throttles.
If you feel that your engine could make gains from increased airflow due to other mods (air filter, cams etc) then you may see a gain from a larger TB but remember why would VW let your car leave the factory with a TB that strangled it top end, they wouldn?t.
Secondly the ratio of size between the primary and secondary throttles is designed to match engine characteristics. So simply swapping TB?s may make your car feel like it pulls harder top end but it may be that what you?ve actually done is stuffed the light throttle response.
Here?s a very rough ?rule of thumb? for you, If you have an engine with loads of torque you may be better off with a TB that has a larger primary throttle plate, if you have a very top endy engine you are probably better off with a small primary and much larger secondary.
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Cheers for the info - I have fun with this all the time when tuning DCOE's.
It's SOOOOOOOOOOOO important to match the barrel size to suit your engine capacity and power delivery as your right it has a big impact on the engine's characteristics.
The main difference here is that the 2.2 throttle body will have more 'flow' than the stock one because of the larger butterflies - so matched with a cam will push the power up the rev range.
Really u need to be able to fine tune futher that just getting a bigger tb of another car but for mild tuning I hopeing it'll do. Seeing as it's my commuter for work I'm not going down the DCOE set-up again and I'm fed up getting 130 miles a tank and that was only a 1660cc !!!
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Think i heard somewhere that the audi 2.2 throttle body is the same size as some mk2 throttle bodies ??? its worth checking, otherwise you'd just be wasting your time! But dont quote me on that!
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You may find this of help too:-
http://homepage.ntlworld.com/alanb2/golf/mods/throttle.htm
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The MK2 already have a larger throttle body so in practice should have the enlarged inlet manifold otherwise the butterflies wouldnt open all the way on full throttle. But check the size to make sure.
The process rich describes is one that is used to port a cylinder head, You use engineers blue or failing that a fine line marker pen to mark where the gasket sits and you grind away the excess with a die grinder or dremel.
So when you've done it you have ports that match exactly and dont hinder the airflow with a step like normal untouched heads or manifolds.