This is my latest upgrade.
The Throttle Body polished by Brian aka. BDC Motorsports.
Looks like a work of art.
Enjoy

 

That look nice, how much he charge for that type of work?
Khris

 

Send BDC a PM or visit his website for more info.

http://bdc.cyberosity.com/main.php?g2_itemId=7216

My polishing was $150 and it was local, so no shipping was involved.
This is straight from his website:

"Labor rates for this modification vary normally from $100 to $150 (plus return shipping of about $15-$20) depending upon the unit".

 

So this "modification" is polishing right?

just wondering why you didn't go with the polished 90mm double throttle body?

 

Brian originally started porting/polishing FC throttle bodies many moons ago. On the FC throttle body it made a substantial dyno-proven improvement in power.

The FC's throttle body is relatively "square" at the opening, porting it out and making it more aerodynamic is a big help. The FD throttle body is already aerodynamic from the factory, and I don't know if anyone has dyno tested a difference with a port/polish job over stock.

Dale

 

The FD throttle body actually has a few edges and lips that when removed and smoothed combined with knife edging the leading edges of the throat walls has to be good for a few hp.
I did my own.
http://www.reganrotaryracing.com/fdtbmods.htm

Regards,
Crispy

 

Those all look really nice. Makes me want to pull mine out and do the same. Anyone "feel" a difference in power?

 

Was hoping to get your interest in this, Brent. I've tested two of them and so far so good. If it wasn't worth it, I wouldn't waste anybody's money or time with it.

My charge is $150 plus return shipping.

B

 

It's reshaping the inlet of the TB (porting) and then eventually polishing it.

B

 

It definitely looks like air would flow into it easier

 

More or less, yep. The idea isn't so much about increasing "flow" by way of making the throats larger (as the butterflies are not replaced) but rather to limit potential reductions in flow that occur from pressure drop points that would slow the air velocity down. It's part of the overall theory of engine power production I call "velocity tuning".

B

 

Hey I check out your site, and I notice u do work mazda 6 1st gen, so any discount if I want FD & the 6 tb at the same time?
Khris

 

Sure. Shoot me a PM or an e-mail at bdc@bdcmotorsports.com and I'll get you taken care of.

B

 

Looks great!

 

Awesome work, looks great Robert. Kudos to Brian, he does good work.

 

Doesn't any increased air flow just get reduced if your UIM and LIM aren't polished/ported also? I would think that the difference would be marginal at best unless the entire air system was done in this fashion.

(I'm not criticizing your work but the affect)

 

I'm not suggesting it's a huge increase, but I know someone who did it and went from no boost creep to having uncontrollable boost creep. That in itself demonstrated some increase in flow. Not very scientific, but it can give those who have upgrade/changed everything else a little extra kick.

 

Technically it's correct but it's sort of a relative concept. Doing something like this mod on the TB, whose aim is to make the unit itself more efficient by removing as much velocity "slow-down" as possible, is but one piece in the larger intake chain. It's but one hourglass where there may be several. The mod does work and it works quite well but it would be complimented by other things done to the overall system.

The factory UIM/LIM doesn't need to be ported and polished at all; certainly not polished. The only mods on that 3rd gen pair I would recommend would be the removal of the double throttle plates/shaft out of the entrance of the UIM as well as possible intake port matching at the tail end of the LIM. Otherwise, the runners and the innards of the surge plenum need to remain rough. The design of those manifolds is already good for a street car, in my opinion, and don't need to be ground out lots.

B

 

Thanks for the responses. I was trying to get my head around the idea of TB polishing.

 

Thanks for the info. I was viewing the pics from my blackberry and now that I am on a PC it is obviously more than just a polish.