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67mm TB

4.1K views 31 replies 17 participants last post by  blackjack  
#1 ·
Can these be found anywhere anymore? Everywhere I looked said out of stock. Was wanting to put the finishing touches on my SVT with the TB, Air Intake, STS, HFC, Transmission mount, a Borla Catback, and topping it off with a reflash to Tom's tune.
 
#13 ·
Unless you actually port your intake manifold to accept the new TB its a total waste of time and money.

The stock manifold is the EXACT same size as the stock throttle body.. so unless you port it out you get no gains no matter how big the TB is.
You get better responce by porting the stocker as well......
It is unless you port out the stock manifold.

I had a buddies SVT in the garage last week, it had a nice aftermarket TB on it... you open up the butterfly and low and behold.... there was the stock port on the INSIDE of the throttlebody. You could put a Mustang 80mm TB on your Focus and as long as you dont port out the manifold its not going to flow anymore than the stocker.

++1

Ported my sotck TB, and there was a much improve increase in throttle responce

When you buy the larger TB from CFM, you're only getting 2mm more space.
 
#5 ·
Unless you actually port your intake manifold to accept the new TB its a total waste of time and money.

The stock manifold is the EXACT same size as the stock throttle body.. so unless you port it out you get no gains no matter how big the TB is.
 
#9 ·
It is unless you port out the stock manifold.

I had a buddies SVT in the garage last week, it had a nice aftermarket TB on it... you open up the butterfly and low and behold.... there was the stock port on the INSIDE of the throttlebody. You could put a Mustang 80mm TB on your Focus and as long as you dont port out the manifold its not going to flow anymore than the stocker.
 
#10 ·
LOL what I'm saying is that they are not a waste of money, because you get improved throttle response. Anything is an improvement over the stock TB whether you port the manifold or not. I used to be able to blip the throttle and have my foot off the gas before the tach moved. [hihi]

Yes, I would port the manifold too, but a ported or 67mm TB is definitely going to be worth it regardless.
 
#11 ·
Well I'd hate to think someone would pay $200 for throttle response when you can get it for almost free by using a dremel and a little epoxy.
 
#15 ·
That's why you buy a spare from somewhere or someone ... and how else do you learn but by first hand experience. ... Mistakes mean knowledge.

-Ray-
 
#17 ·
Just got done porting my new SVT DSIM to complement the CFM 67mm TB. Just threw the manifold upside-down in a vice & went to town with a half-moon file & sandpaper. Cleaned up with a shopvac and some towels.

Image
Image

(please ignore my toe lol)

I just handled the 5mm difference (62mm to 67mm) by beveling the plastic on the IM. The bevel is about 3mm all around (so I could use a 68mm TB now lol). It only goes about 1/2" down, and since the TB opening on the SVT DSIM does not widen up inside the manifold, I didn't go any deeper.

This should help airflow quite a bit since it will do away with the awful tumbling that would have occurred with that sharp 2.5mm lip all the way around. The only drawback would be that the plastic surface is not quite as smooth as it was before, which will increase the boundary layer a bit. The reduced tumbling will increase the velocity of air enough to more than make up for that.
 
#22 ·
Does anyone have a pic of a 67m TB on the unmodified intake manifold? I forgot to take a "before" picture, and it would be nice to have that on file.

If anyone has the CFM TB and has not modified their intake manifold yet, you could snap a picture down the TB to show the "lip" that we are all talking about here.
 
#23 ·
We do have our cfm 67mm throttle body in-stock. http://focus.c-f-m.com/index.asp?PageAction=VIEWPROD&ProdID=83.

Our throttle body features a larger 3 inch inlet, which allows for increase flow and more performance.

A stock throttle body only has a 2.75 inch inlet, which is also true with any stock modified unit.

Our throttle body has a nice flat throttle body blade compare to the stock potato chip stock throttle body blade does make a difference in air flow.

Part included with our throttle body:
TPS bolts, T-30 Torx bit, T-20 Torx bit, instructions, and free CFM decal. The TPS and rubber throttle body gasket can be reused, so they are not included.


These are the only true high performance throttle bodys on the market. The throttle bodys feature larger inlet openings with larger throttle body blades than the factory throttle body for increase air flow. CFM throttle body offer increased throttle response with increase performance over the factory throttle body. All of the throttle bodys are CNC machined billet aluminum made in the United States. CFM offers free tech support for any of our products.
 
#26 ·
All of the throttle bodys are CNC machined billet aluminum made in the United States. CFM offers free tech support for any of our products.
haha i love how CFM puts made in United States. I just thought i would say that hahah at least something is made here.... unlike most of our cars.
 
#24 ·
i personally love my 67mm tb from cfm.

nothing like accelerating when only pushing th gas down about 1.5mm :)
 
#27 ·
I would buy a CFM throttle body, but it is not allowed in my autocross class.

Therefore I need to bore out my stock TB, but have no clue how to do it correctly.
If the class you're in doesn't allow aftermarket TB, I highly doubt you can legally port your stock one.
I've never seen where mods are allowed to a TB, without also allowing the installation of an aftermarket one.

What class are you in?
 
#31 ·
^^^You just posted rules for Street Prepared (SP), not Street Touring (ST).
(BTW, that Moutons stuff is from 2003...it's a bit old)
Here's a link to the 2009 SCCA rules:
http://www.scca.com/contentpage.aspx?content=61

Aftermarket TB or any modification to the stock TB is not allowed in ST:
14.10 ENGINE AND DRIVETRAIN
C. The air intake system up to, but not including, the engine inlet
may be modified or replaced.
The engine inlet is the throttle body, carburetor, compressor inlet, or intake manifold,
whichever comes first.
In ST, you can run any intake (CAI, SRI, etc), but you can't touch the TB or anything downstream of it.