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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Intake: Intake Tract, Airbox, Filter, Manifold, Gaskets » Big bore throttle body... « Previous Next »

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Samickguy15
Posted on Friday, July 21, 2006 - 01:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
What are the aftermarket or factory options for larger throttle bodies??? EFI of course...

I'm considering boring mine out and installing a larger butterfly. I've located a place that does this, but they get $300+ for it. I can get a butterfly for $13 and do the boring myself (free).

Anybody got anything to add/suggest???
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Blake
Posted on Friday, July 21, 2006 - 02:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
The folks at Cycle Rama and Revolution Performance have exactly what you are looking for already finished. Give them a call.
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Samickguy15
Posted on Friday, July 21, 2006 - 04:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
The problem there is that cost is around $500!!! for just the TB & manifold.
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Diablobrian
Posted on Friday, July 21, 2006 - 07:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
How many hp are you putting down? the stock 12 throttle body is good for up to
around 125 or so before it becomes a real problem. A lot of race teams are running
the stock throttle body.

Over boring the throttle body is not an easy job. aside from the machine work there
is hand blending required. $500 doesn't sound bad from a machinist viewpoint.
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Samickguy15
Posted on Sunday, July 23, 2006 - 04:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
If that's the case then maybe I won't worry about it. I'm putting an EFI setup from a '99 S3 on my '00 Sportster. HP isn't really a big concern at this point. If I get to the point of making near 125 I would be more than happy, so I imagine I'll just leave it alone. Thanks for the info.
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Jadow
Posted on Monday, June 13, 2011 - 11:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I have a 2008 XB9SX Throttle body. is it still 45mm verses the XB12 49mm? How big can I have my XB9 Throttle body bored out to?
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