 Hole in Throttle Body Flap, Needed or Not |
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| 914Sixer |
 Oct 4 2022, 08:32 PM
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914 Guru  Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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So I bought a big bore throttle body a while back and just got around to comparing it to the stock one. Stock body has a hole in it. What is the function of the hole? To keep the idle stable? Do I need to put one in big bore? Inquiring minds want to know.
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| Geezer914 |
Oct 5 2022, 01:52 PM
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Geezer914 Group: Members Posts: 1,415 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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What did the larger throttle body come off of? MM size?. Don't forget to enlarge the plenum opening to match the throttle body bore. Tail pipe expander works great.
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| VaccaRabite |
Oct 11 2022, 06:55 AM
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
QUOTE(Geezer914 @ Oct 5 2022, 03:52 PM)  What did the larger throttle body come off of? MM size?. Don't forget to enlarge the plenum opening to match the throttle body bore. Tail pipe expander works great. Yep! If you don't enlarge the plenum you won't see the benefits. I used an exhaust expander and bumped it out to just SLIGHTLY oversized and then worked the taper back into the plenum with a small chasing hammer until I had a perfect fit between the parts. About a thousand little taps with the hammer, but only about 15 minutes of time. Used a super thin smear or RTV instead of the rubber gasket, as the gasket was now too small anyway. Also, are you using custom EFI or just DJet/LJet? When I went from the stock TB to the 53mm GoWesty TB I was able to feel a difference, but only after retuning the engine to take advantage of the new higher top end. Zach |
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Posts in this topic
914Sixer Hole in Throttle Body Flap Oct 4 2022, 08:32 PM
rjames To an old thread on the topic.
http://www.914wor... Oct 4 2022, 09:30 PM Superhawk996 Comparing apples to oranges. Do not drill a hole.... Oct 5 2022, 06:44 AM
ClayPerrine
Comparing apples to oranges. Do not drill a hole... Oct 5 2022, 08:47 AM Superhawk996
I am not an engineer, but I do understand engin... Oct 5 2022, 09:31 AM ClayPerrine
I am not an engineer, but I do understand engi... Oct 5 2022, 09:53 AM SirAndy The "big bore" looks smaller than the st... Oct 5 2022, 09:42 AM 914Sixer Just the way the picture looks. Oct 5 2022, 01:30 PM 914Sixer Using D-Jet on with MPS tuned by Jeff B. Engine i... Oct 12 2022, 05:42 AM r_towle
Using D-Jet on with MPS tuned by Jeff B. Engine ... Oct 12 2022, 06:17 PM ClayPerrine
You do not need a larger throttle body all the w... Oct 13 2022, 01:40 PM Rand "The hole." Answer me this:
Can't th... Oct 12 2022, 08:42 PM DRPHIL914
Using D-Jet on with MPS tuned by Jeff B. Engine ... Oct 13 2022, 03:34 PM |
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