75MM Throttle Body and Spacer?

kpoirot · February 14th, 2008, 04:57 PM

I just purchased a 75mm throttle body and was thinking about getting a spacer but would a spacer restrict my airflow since i'm increasing my throttle body size? also if it wouldn't hurt me what's a good spacer to use?

MustangSallee · February 14th, 2008, 05:58 PM

First off, are you converting to a fox style TB or just replacing the OEM unit? Second, if you use a 75mm with the mods you have listed you will loose allot of torque. The biggest suggested use for stock intake is 65mm and 70mm if you are lightly modded. The big 75mm are for those with lots of mods [h,i,c], or with supercharger/turbo applications. I run a 70mm BBK with my GT-40/Explorer intake on mine. A spacer for a 94-95 Stang will only create a 'turbine like'/swirled air flow, which may or may not be what you want, and I do not think that spacers for 94-95's [with the exception for the after market intake elbow] don't come in different sized just stock.

Bullitt95 · February 14th, 2008, 06:47 PM

Originally Posted by MustangSallee

Second, if you use a 75mm with the mods you have listed you will loose allot of torque.

That's not true. I have a 75mm TB on my 5.0 and I didn't lose any torque. Keep in mind that if you do go for this TB size, that you'll need to port the inlet of the upper manifold to match the 75mm diameter.
The threaded helix spiral inside the TB spacer is a marketing gimmick and does absolutely bugger all to increase airflow. If you want a little more torque at low rpm, you're better off inserting a phenolic spacer between the upper and lower manifolds to increase the effective runner length.

95opal · February 19th, 2008, 12:54 PM

With the mods you have in your sig a throttle body would be a waste of money. At least upgrade your intake first.

Bullitt95 · February 20th, 2008, 02:00 PM

Not a total waste of money because a larger TB will improve throttle response, but I agree that you'd only get the most out of it if you also install a higher-flowing intake manifold.

kpoirot · February 20th, 2008, 04:16 PM

Well i got a brand new BBK 75 MM intake shipped to me for $130 so i couldn't pass that up and i do plan on getting track heat TFS intake to match up with it this summer.

1slo5.0 · February 20th, 2008, 09:42 PM

Big throttle body on stock engine equals loss of power and loss of throttle response 99% of the time. I've seen it first hand over and over and over again. I used to tell my customers this but they all knew more than me and "needed" that big throttle body. After they put it on I always said "I told you so" but of course since they don't want to admit they were wrong they would say things like "dude this thing rips now" or "this throttle body knocked 3 tenths off my ET". To each his own. I've run in the 11s with a stock throttle body.

TKOTLARZ · February 20th, 2008, 10:26 PM

definitely don't go that big..not till you start boosting your motor...you got a big space for air, but not enough air coming through equals less flow

TKOTLARZ · February 20th, 2008, 10:27 PM

i would say get a upper and lower manifold and get like a 70 mm

TKOTLARZ · February 20th, 2008, 10:27 PM

i need a throttle body myself..anybody have one for sale?

February 14th, 2008, 04:57 PM	#1
kpoirot Regular 1995 GT 5.0 14.66 Join Date: Dec 2007 Location: Adams, MA Posts: 84 iTrader: 0 reviews	75MM Throttle Body and Spacer? I just purchased a 75mm throttle body and was thinking about getting a spacer but would a spacer restrict my airflow since i'm increasing my throttle body size? also if it wouldn't hurt me what's a good spacer to use? __________________ Mods:Underdrive Pulleys, Ram Air w/ K&N Filter, Rebuilt T-5, 3.73s, High Flow H-Pipe, Energy Suspension Poly Motor and Tranny Mounts. Soon: Un= headers, Centerforce Clutch, Steeda Tri-Ax Fidanza Alumnum FW, BBK 75mm TB, EGR Elim.

February 19th, 2008, 12:54 PM	#4
95opal Hardcore Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 1,570 iTrader: 0 reviews	With the mods you have in your sig a throttle body would be a waste of money. At least upgrade your intake first. __________________ Check out my build here: http://www.sn95source.com/showthread...-Opals-rebirth

February 20th, 2008, 02:00 PM	#5
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.546 @ 105.32 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,554 iTrader: 0 reviews	Not a total waste of money because a larger TB will improve throttle response, but I agree that you'd only get the most out of it if you also install a higher-flowing intake manifold. __________________ 244rwhp 284rwtq Mod list in My Garage

February 20th, 2008, 04:16 PM	#6
kpoirot Regular 1995 GT 5.0 14.66 Join Date: Dec 2007 Location: Adams, MA Posts: 84 iTrader: 0 reviews	Well i got a brand new BBK 75 MM intake shipped to me for $130 so i couldn't pass that up and i do plan on getting track heat TFS intake to match up with it this summer. __________________ Mods:Underdrive Pulleys, Ram Air w/ K&N Filter, Rebuilt T-5, 3.73s, High Flow H-Pipe, Energy Suspension Poly Motor and Tranny Mounts. Soon: Un= headers, Centerforce Clutch, Steeda Tri-Ax Fidanza Alumnum FW, BBK 75mm TB, EGR Elim.

February 20th, 2008, 09:42 PM	#7
1slo5.0 I Post Entirely Way Too Much 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Big throttle body on stock engine equals loss of power and loss of throttle response 99% of the time. I've seen it first hand over and over and over again. I used to tell my customers this but they all knew more than me and "needed" that big throttle body. After they put it on I always said "I told you so" but of course since they don't want to admit they were wrong they would say things like "dude this thing rips now" or "this throttle body knocked 3 tenths off my ET". To each his own. I've run in the 11s with a stock throttle body. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

February 14th, 2008, 05:58 PM	#2
MustangSallee Regular 1994 Mustang 5.0 ???? Join Date: Jun 2007 Location: Lexington KY Posts: 78 iTrader: 0 reviews	First off, are you converting to a fox style TB or just replacing the OEM unit? Second, if you use a 75mm with the mods you have listed you will loose allot of torque. The biggest suggested use for stock intake is 65mm and 70mm if you are lightly modded. The big 75mm are for those with lots of mods [h,i,c], or with supercharger/turbo applications. I run a 70mm BBK with my GT-40/Explorer intake on mine. A spacer for a 94-95 Stang will only create a 'turbine like'/swirled air flow, which may or may not be what you want, and I do not think that spacers for 94-95's [with the exception for the after market intake elbow] don't come in different sized just stock.

February 20th, 2008, 10:26 PM	#8
TKOTLARZ Hardcore Enthusiast 1994 GT Join Date: Nov 2007 Location: lake worth, Florida Posts: 1,002 iTrader: 0 reviews	definitely don't go that big..not till you start boosting your motor...you got a big space for air, but not enough air coming through equals less flow __________________ Cohagan Engineering, Inc.

February 20th, 2008, 10:27 PM	#9
TKOTLARZ Hardcore Enthusiast 1994 GT Join Date: Nov 2007 Location: lake worth, Florida Posts: 1,002 iTrader: 0 reviews	i would say get a upper and lower manifold and get like a 70 mm __________________ Cohagan Engineering, Inc.

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