TB overbore

keepinitril

Member

Mar 24, 2009

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Anaheim Hills

Jan 16, 2010

#1

• Jan 16, 2010

• #1

what is the largest anyone has taken the stock 60mm throttlebody to?

PS: what about the EGR spacer?

 

stykthyn

I want to measure mine. It doesn't look that tall.

15 Year Member

Jul 6, 2006

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gainesville

Jan 17, 2010

#2

• Jan 17, 2010

• #2

usually the inlet for the intake is ported to match the tb. get an exploder tb, with a little modding its a cheap 65mm tb.

 

keepinitril

Member

Mar 24, 2009

102

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Anaheim Hills

Jan 17, 2010

#3

• Jan 17, 2010

• #3

i believe I have the one from the explorer now,
so Im left with this stock one to experiment with

 

NIKwoaC

中國製造

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Oct 31, 2006

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Jan 18, 2010

#4

• Jan 18, 2010

• #4

Are you replacing the throttle plate to go with a bigger bore? From what I remember, the location of the shaft bearings for the throttle plate make it pretty much impossible to enlarge the bore without a lot of work, even with a bigger throttle plate to match.

I know from experience the EGR spacer can't be bored much past 65-67mm, you'll break through the wall.

 

keepinitril

Member

Mar 24, 2009

102

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Anaheim Hills

Jan 20, 2010

#5

• Jan 20, 2010

• #5

im lookin at the EGR plate right now, and the OD is 75, so youre probably right, now the egr plate the I installed had a bigger OD, I dont quite know what it came from, ill bet its from an explorer, but I just installed a 65 tb and plate that I bought together

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Jan 20, 2010

#6

• Jan 20, 2010

• #6

Unless you are running heads that flow great or a supercharger, no need to go over 65mm.

Just make sure you are running at least a 70mm MAF if Mass Air

 

keepinitril

Member

Mar 24, 2009

102

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Anaheim Hills

Jan 22, 2010

#7

• Jan 22, 2010

• #7

i have a nicely done pair of gt40p heads with 1.94 intakes

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,164

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Jan 22, 2010

#8

• Jan 22, 2010

• #8

In that case, i might go with a 70mm and port match the intake to it.

You running an explorer intake?


Reason there is no point to porting a stock throttle body larger is because you are still left with a 60mm or 65mm blade.

70mm TB, and perhaps 75mm or larger MAF

 

tmoss

Gettin Wired

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Jun 28, 2001

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Jan 22, 2010

#9

• Jan 22, 2010

• #9

Mustang5L5 said:

Reason there is no point to porting a stock throttle body larger is because you are still left with a 60mm or 65mm blade.

Click to expand...

just buy a 70mm and be done with it......

 

keepinitril

Member

Mar 24, 2009

102

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Anaheim Hills

Jan 25, 2010

#10

• Jan 25, 2010

• #10

Mustang5L5 said:

In that case, i might go with a 70mm and port match the intake to it.


Reason there is no point to porting a stock throttle body larger is because you are still left with a 60mm or 65mm blade.

Click to expand...

Im planning on buying a custom blade from kinsler

 

giddyup306

Founding Member

Oct 22, 2002

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Jan 25, 2010

#11

• Jan 25, 2010

• #11

Modifying throttle bodies is much more trouble than it's worth.

 

keepinitril

Member

Mar 24, 2009

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Anaheim Hills

Jan 26, 2010

#12

• Jan 26, 2010

• #12

i guess youre right

 

Gearbanger 101

Straight Outta Locash

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Jan 26, 2010

#13

• Jan 26, 2010

• #13

giddyup306 said:

Modifying throttle bodies is much more trouble than it's worth.

Click to expand...

QFT!!!

Speaking from experience. I ruined a couple of perfectly good stock throttle bodies trying to machine them out to 65mm. There just isn't enough wall thickness to work with. By 63mm you've compromised its structural integrity. Meaning a hard bump with the inlet hose installed and you'll snap the neck right off of it.

At 64mm, you can start to actually see the inner wall starting to discolour because you're getting paper thin in spots that you could essentially push through with the tip of a screw driver.

...and by 64 1/2mm, you've broken through and made yourself an expensive paper weight.

The spacer on the other hand will bore out to 65-67mm as stated...but again that's of little use unless you've got a matching throttle body to couple with it.

 

keepinitril

Member

Mar 24, 2009

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Anaheim Hills

Jan 27, 2010

#14

• Jan 27, 2010

• #14

Gearbanger 101 said:

...and by 64 1/2mm, you've broken through and made yourself an expensive paper weight.

Click to expand...

Thanks for the experience lesson

 

giddyup306

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Oct 22, 2002

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Jan 27, 2010

#15

• Jan 27, 2010

• #15

Gearbanger 101 said:

QFT!!!

Speaking from experience. I ruined a couple of perfectly good stock throttle bodies trying to machine them out to 65mm. There just isn't enough wall thickness to work with. By 63mm you've compromised its structural integrity. Meaning a hard bump with the inlet hose installed and you'll snap the neck right off of it.

Click to expand...

Mine was a SVT throttle body. I also modified two Mustang throttle bodies to fit on Contour SVTs (there are no aftermarket TBs available). With that being said it is extremely tedious and you have to be uber careful.