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Old 12-04-2008, 12:52 AM   #1 (permalink)
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Question A1 throttle body upgrade?

hey...i got a D16A1 and i cant seem to find any bigger throttle body..any help?
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Old 12-04-2008, 03:28 AM   #2 (permalink)
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throttle response.

the B18a is the best to get for the reason is it's ODB0 and its 58mm while the ZC is 55mm. but make sure you post match you intake manni to the tb.
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Old 12-04-2008, 06:56 AM   #3 (permalink)
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B-series and later D-series throttle bodies have a different bolt pattern than the D16A1, D16A6 and ZC throttle bodies and don't bolt onto the manifold - the best bet is to have Maxbore bore out the throttle body

http://www.maxbore.com/
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Old 12-04-2008, 01:28 PM   #4 (permalink)
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Why do you want a larger throttle body?
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Old 12-04-2008, 01:29 PM   #5 (permalink)
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a zc tb is 55mm but the B18a is 58mm and ODB0.
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Old 12-04-2008, 11:01 PM   #6 (permalink)
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b18 have a different bolt pattern...
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Old 12-09-2008, 12:53 AM   #7 (permalink)
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i real dont even know how much MM is my stock 89' d16a1 throttle body..any one?..

p.s the maxbore.com looks realy good 80% chance im going that way..thanks jlicrx
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Old 12-09-2008, 09:43 PM   #8 (permalink)
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Go maxbore if using A6 IM.

I'm using a GSR TB on a customers A6 using jli's manifold adaptor an Performer-X IM.
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Old 12-13-2008, 12:35 AM   #9 (permalink)
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ok now heres a question..what would do better..buy the ZCspeed plate and use a Skunk2 mani with a b-series T-b or bore out my A6 mani and go with maxbore and bore my t.b aswell...which would be better?
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Old 12-13-2008, 10:01 AM   #10 (permalink)
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if you have a stock engine, the Skunk2 manifold is going to slow it down - your best bet is to either: find an OBD0 DOHC ZC intake manifold, have Maxbore bore out the throttle body and port match the intake to the throttle body or find an OBD1 DOHC ZC intake manifold which will accept the larger B-series throttle bodies - without any internal mods, like camshafts, higher compression, etc., the larger throttle body will give you a little more power at high rpm but at lower rpm it will tend to bog and stutter - the larger the throttle body, the more bogging and stuttering - the Skunk2 manifold has too large of plenum and runners for the NA, basically stock, engine
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Old 12-13-2008, 10:06 AM   #11 (permalink)
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You can solder an aluminium plate on your current manifold, port it to Xmm to match the TB you want to use.

I got an H22 62mm TB on my A6 modified manifold : esdafoo's ED Y7-T project
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Old 12-14-2008, 12:25 PM   #12 (permalink)
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wanna sell it?...
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Old 12-16-2008, 08:28 AM   #13 (permalink)
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Absolutely not! :P
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Old 12-17-2008, 09:27 AM   #14 (permalink)
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I had the throttle body on my ZC bored out. I don't remember the name of the place, but I had to send it to GA to get the work done. Did a great job, made a new throttle plate, they shaved the shaft and screws too. Don't remember how much it cost, but I don't think it was too much (or I wouldn't have had it done).

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Old 12-19-2008, 11:03 PM   #15 (permalink)
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aww mann....would had love to use it on my build..

p.s i emailed maxbore a few times and no answer.. ...
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