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porting a stock throttle body

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8.3K views 10 replies 11 participants last post by  WUGcatsvt  
J
#1 ·
i do a lot of porting and polishing in the stlouis area on mustang stuff cylinder heads, throttle bodies, intakes, headers and plenums. i asked if the stock focus throttle body could be ported and someone said yes and that it would offer a comparable gain to an aftermarket one.

the svt focus t body is a little differently set up to what im used to seeing i was wondering if anyone has a pic of a ported throttle body that they could send me or let me see. that way i can see what the norm is that people are doing to them. thankyou

ok so im editing this post now. i did a search on the porting and polishing and was wondering. i found a huge post on it that was very informative, but im not sure, what is the epoxy used for? dont you want to take material out, not put it in? i also havent even looked at my girlfriends throttle body on her svt yet though so maybe thats why i dont understand. anyway let me know thanks.

nick
 
#2 ·
The epoxy is a must.
If you didn't add it, you'd end up with 2 holes in the TB after you ported it.

You have to add material in an area that protrudes into the bore.
^^^The bore is not concentric from the factory, there's a big hump in the middle.
That's where you add the epoxy (on the outside), so you can hone it out to a perfect circle, and get rid of that hump.
 
S
#3 ·
I used 5 minute 2part epoxy, from autozone. Worked really well, I used the TB for about 10K, and it held up well. Then I sold it to SLVRBULLET03.
Heres some pics of the cat eyes from removing the hump.
Image

Image
 
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#4 ·
Wow, wow a great, cheap Mod, I'm the guy who bought SVT-SAGE's ported TB, and at first I was weary about the ripples used from the Drimmel, but turns out this REALLY increases the throttle response, it's a nice DIY mod!
 
#7 ·
I JUST ported my TB last night. I didn't take as much off as to where I would need epoxy to cover the holes, but the hump is almost flush with the rest of the throttle body. I took it out for a drive today and my butt dyno told me it feels faster, but I'm sure I was just imagining it. ALTHOUGH I know I did NOT imagine my RPM's hanging much less and dropping quicker, so I guess it was worth the hour and a half I spent on it,
 
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#8 ·
looks good, and it saves you a bit of money.
 
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S
#9 ·
Another cheaper option is to go on ebay and buy a 65 mm throttle body from an older 5.0 explorer. I saw them on there anywhere from 1$-50$. Then by a 65mm diamond hole saw, 10$ on ebay. Now you have a plate and a hole saw, supply drill and you have a 65mm throttle body for cheap. You'll need the epoxy obviously.
 
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