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Old 11-29-2008, 07:20 PM   #1
Blase
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Default PnP question?

I just a general question about porting and polishing things like throttle bodies. What happens to the plate that's inside? If the diameter inside the cylinder is getting bigger, is the plate inside replaced to fit the bigger hole or is it used as is and just lets air through? Just wondering yano?
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Old 11-29-2008, 10:11 PM   #2
Storm
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Most times, when people refer to "porting" the TB, they just taper the inlet area up to the plate and polish it real nice. To actually take the ID out further, you have to make a new throttle plate to fit it.

Hope this helps,
Jay
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Old 11-30-2008, 12:07 AM   #3
Forester_007
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Yeah just replace the plate for a bigger one or get one custom made.
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Old 11-30-2008, 05:39 PM   #4
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GrimmSpeed does TB PnP. They'll do a thermal coating too.
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Old 11-30-2008, 08:01 PM   #5
decke48
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TWE does boring for TB and Optimizing. optimizing flow 40cfm better, boring 70cfm better over stock 435cfm
TWE services
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Old 12-01-2008, 01:41 PM   #6
GrimmSpeed
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Quote:
Originally Posted by Blase View Post
I just a general question about porting and polishing things like throttle bodies. What happens to the plate that's inside? If the diameter inside the cylinder is getting bigger, is the plate inside replaced to fit the bigger hole or is it used as is and just lets air through? Just wondering yano?
The throttle body is a very important part of the intake system and can easily be damaged if not ported correctly. We do offer a porting service at our shop as well as ceramic barrier coating and thermal dispersent coating.

Here is a link to our port work for a WRX DBW throttle body. http://www.grimmspeed.com/catalog/pr...products_id=47

If this is something you would be interested in feel free to shoot us a PM or email us at sales@grimmspeed.com

Mike
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Old 12-02-2008, 01:22 PM   #7
Blase
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Well, this is something I wont be doing for a while. I've been unemployed since september. The reason i started this thread, though, was because I'd eventually like to send it over to grimmspeed and get it done. The only question is when. thanks for chimming in guys.
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Old 12-02-2008, 03:33 PM   #8
GrimmSpeed
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Quote:
Originally Posted by Blase View Post
Well, this is something I wont be doing for a while. I've been unemployed since september. The reason i started this thread, though, was because I'd eventually like to send it over to grimmspeed and get it done. The only question is when. thanks for chimming in guys.
Not a problem were ready when ever you are

To kind of go back and answer your second question we dont port the area where the valve reaches the cyliner wall. We port everything diretctly up until that point to insure that the valve is sealing as well as stock.

Mike
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Old 12-02-2008, 03:57 PM   #9
rougeben83
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here's when I did mine when I was N/A:
http://sl-i.net/FORUM/viewtopic.php?f=11&t=8093

The last pic didnt' show when I polished up the walls and knife-edged the tb plate though.

Pnp is pretty simple, start with carbide bits to start cutting away material, then sanding drums (60-80g) then flapwheel (120g), then cross buffs to smooth it out, finish off with polishing compound. The TB is made of aluminum so it doesn't take a lot of force to cut away at the metal. Just go slow, take your time, and always take time to feel the surface youre working on to make sure its even. The TB was my first try at Pnp, I say if you have the time, it's a good learning experience (and cheap mod).

My goal was to smooth out the intake tract and to create a velocity-stack effect as air enters the TB lip and into the manifold, not necessarily to just make the whole opening bigger (even with the right sized plate you may be doing more harm than good as the EM is calibrated to a certain diameter in the intake piping most of the time...it's like changing the diameter of your MAF tube).
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