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 Post subject: Re: DIY ITBs
PostPosted: Fri Oct 26, 2012 6:03 am 
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Location: blue mountains
PM 'Strider' on this forum.

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 Post subject: Re: DIY ITBs
PostPosted: Fri Oct 26, 2012 10:44 am 
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just to let peeps know OBX ITBs on ebay offer the ITBs without manifolds alone for the 45mm D16 & b16 honoda donk for $300usd alone without manifold. Quite a bargain but must do at least 2 sets to make it worthwhile for the sellers as they run at small profit margins at that price.

http://www.ebay.com/itm/OBX-ITB-Individ ... ceRpt=true

http://www.ebay.com/itm/OBX-ITB-Individ ... 5c&vxp=mtr

you just run your own velocity stack trumpets and striders manifold with injector bosses and rail from your gti.


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 Post subject: Re: DIY ITBs
PostPosted: Fri Oct 26, 2012 12:15 pm 
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Location: Hamilton NZ
Using 45mm plus TB's would not be optimum for 1.3. ie cause of disappointing mid range performance etc. With m/c or 4age TB's you are guaranteed OE quality!!!. A good standard manifold to cut down and mod is the factory reverse manifold with very straight runners...caution needed, not sure of clearance if using brake booster. A straight inlet path without joining steps that interupt flow is preferable.

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 Post subject: Re: DIY ITBs
PostPosted: Tue Oct 30, 2012 2:59 pm 
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Arent 4age 20v ITBs 44mm are they not? While the D16 ITBs are 45mm vs 44mm didnt think that would make such a difference in low to midrange, 40mm are also available from OBX, lighter than 4age 20v setup and quality seems good enough by owners who use them.

Strider has the flanges to make these work but I agree Motobike ITbs are at 40mm are suited for most applications.


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 Post subject: Re: DIY ITBs
PostPosted: Tue Oct 30, 2012 8:55 pm 
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Location: Hamilton NZ
d wrote:
Arent 4age 20v ITBs 44mm are they not?

4AGE throttle bodies come in 2 diameters...the earlier "silver top'' are 42mm and the later
''blacktop'' are 45mm.

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 Post subject: Re: DIY ITBs
PostPosted: Wed Oct 31, 2012 7:20 am 
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Location: Hamilton NZ
Bigger is not always better...
http://www.jenvey.co.uk/jenvey/throttle ... y-dynamics

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 Post subject: Re: DIY ITBs
PostPosted: Wed Oct 31, 2012 2:48 pm 
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Never is was just under the impression they where 44mm for all models so thinking 1mm couldnt be that much of a difference. While 42mm are spot on for a gti for quality pump fuel but methanol and e85 for high rpm big hp is another story even on small donks.


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 Post subject: Re: DIY ITBs
PostPosted: Wed Oct 31, 2012 4:29 pm 
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42 is still bigger than it needs to be, Jenveys recommendations for a 38mm butterfly is upto 46 bhp per cylinder, thats 184 bhp for a 4cyl, so for most gti's in the 120-150bhp range, 38 is far more optimal, if you think about similar engines running on twin 40mm webers, they usually have 34mm chokes.


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 Post subject: Re: DIY ITBs
PostPosted: Wed Oct 31, 2012 4:40 pm 
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Yes 42mm is a bit big, would have preferred 38mm (I think CBR has 38mm TBs?) but the K1 gixxer TBs seemed like the easiest to modify.

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