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Joined: Sep 2002
Posts: 6,106
Addicted CEG\'er
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Addicted CEG\'er
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My Mustang throttle body has a bypass in the casing, which is a completely different design than the SVT throttle body. It's a very valid question, as there aren't a whole lot of TB's that use the same method.
Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
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Joined: Nov 2000
Posts: 10,015
Hard-core CEG'er
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Hard-core CEG'er
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Originally posted by todras:
How do think the car gets air to idle? 
With the Idle Air Controller Valve? 
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
Posts: 21,197 |
I thought he had an SVT TB in his hand. 
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
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My thoughts, through the IAC.
It still gets it through the IAC even if its an SVT.
When I first started doing the 70mm conversions I drilled the same size hole in the TB plate. It didn't affect anything either way.
I assume it is to keep some air flowing in through the throttle body to aid in off idle throttle response since the contour IAC routes it so far around the TB inlet. Maybe it prevents a stumble or something.
Doesn't hurt anything not to have it or to have it though. On an SVT that is.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
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Originally posted by todras:
How do think the car gets air to idle?
The idle air control valve.
Next obvious question please? 
The hole in the throttle plate is there to help equalized the air pressure on both sides of the plate. This means you do not get as turbulent a spike when the plate opens.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
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Guess my joke bombed. 
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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Joined: Sep 2000
Posts: 4,693
Hard-core CEG'er
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Hard-core CEG'er
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Posts: 4,693 |
Originally posted by DemonSVT:
Originally posted by todras:
How do think the car gets air to idle?
The idle air control valve.
Next obvious question please?
The hole in the throttle plate is there to help equalized the air pressure on both sides of the plate. This means you do not get as turbulent a spike when the plate opens.
The size of the hole was used as a tuning aid by knowledge tuners in the days before electronic engine controls. I suspect that it could be used in the same way today. Especially with a cam change where the idle speed needs to be raised, you can accomplish the same thing as cracking the throttle plate open a little more by gently enlarging the hole. This will help keep from upsetting the throttle position sensor reading. In the case of carburators, enlarging the carb throttle plate hole kept the proper relationship with the vacuum ports and various linkages (choke, accel pump).
Jim Johnson
98 SVT
03 Escape Limited
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Joined: May 2000
Posts: 7,012
Hard-core CEG'er
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OP
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you learn something new everyday. 
Oo (xxx)oO
o xxxxxxxx o
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