What size TB should I use?

Rustbelt · July 25th, 2007, 03:13 PM

I'm going with a GT-40 top end. GT-40p heads, Explorer intake etc. What would be the best size TB to use? 65mm, 68mm, 70, 73 etc.

Thanks

TENGRAM · July 25th, 2007, 03:29 PM

Originally Posted by Rustbelt

I'm going with a GT-40 top end. GT-40p heads, Explorer intake etc. What would be the best size TB to use? 65mm, 68mm, 70, 73 etc.

Thanks

65 will work well. 70 would also be a good choice (thats what i use) but you will have to enlarge the inlet of the explorer intake to make it work right. you could use a rotary tool to do this or a cylinder hone would work best

Tony_90fox · July 25th, 2007, 07:36 PM

I put a 65mm on mine.

Racinjason81 · July 25th, 2007, 11:47 PM

+1 for 70mm

89LX347 · July 26th, 2007, 12:20 AM

theres a 68 and 73 mm TB?

Rustbelt · July 26th, 2007, 04:23 AM

maybee the 68 and 73 were maf. i've been looking at too many parts lately!

thanks guys. 65 will work and 70 is better!

86GT50 · July 26th, 2007, 09:53 AM

I would go with a 75mm if you still plan on upgrading in the future....

Haggis13 · July 26th, 2007, 10:12 AM

For you r combo I wouldn't go too big. (70 max) TB has to be sized right for the car and your mods, or you can end up having performance problems.

JBIGBOOTSY · July 26th, 2007, 10:19 AM

use the explorer one. its 65mm and its cheap. just cut off the plate that the throttle cable connects to and tack weld on the one from your car.

fastford3388 · July 26th, 2007, 02:33 PM

is there a problem if you go too big? i mean within reason, you obviously wouldn't put a 80mm on a stock setup but would 70 be too big on a stock setup?

theninja · July 26th, 2007, 03:27 PM

Downfall of TB being too wide: Potential for more air, but you're getting less velocity.

Basically, if you have a huge opening and you're on a stock motor (or a motor not setup for it), the opening will not be able to actually efficiently suck the air into the motor. Using a smaller diameter TB, the air is forced through a smaller opening and the revese pressure creates a vaacuum in the manifold. It allows the air to move through the intake manifold quicker and more efficiently. Same reason you don't run 5" exhaust from the headers-back

Rustbelt · July 27th, 2007, 03:06 AM

i've been trying to get the whole explorer set up. someone said that autos may have a problem with the explorer 65mm intake. if any one knows for sure let me know!

July 25th, 2007, 03:13 PM	#1
Rustbelt Regular Join Date: Mar 2007 Posts: 245 iTrader: 0 reviews	What size TB should I use? I'm going with a GT-40 top end. GT-40p heads, Explorer intake etc. What would be the best size TB to use? 65mm, 68mm, 70, 73 etc. Thanks

July 25th, 2007, 07:36 PM	#3
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	I put a 65mm on mine. __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

July 25th, 2007, 11:47 PM	#4
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	+1 for 70mm __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

July 26th, 2007, 12:20 AM	#5
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,304 iTrader: 0 reviews	theres a 68 and 73 mm TB? __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

July 26th, 2007, 10:12 AM	#8
Haggis13 Enthusiast 1993 Mustang GT Join Date: Sep 2006 Location: Ottawa, Ontario, Canada Posts: 593 iTrader: 0 reviews	For you r combo I wouldn't go too big. (70 max) TB has to be sized right for the car and your mods, or you can end up having performance problems. __________________ Bart 93 Black on Black GT Kenne Bell S/C GIVE 'ER!

July 26th, 2007, 04:23 AM	#6
Rustbelt Regular Join Date: Mar 2007 Posts: 245 iTrader: 0 reviews	maybee the 68 and 73 were maf. i've been looking at too many parts lately! thanks guys. 65 will work and 70 is better!

July 26th, 2007, 09:53 AM	#7
86GT50 Newbie Join Date: Feb 2007 Posts: 38 iTrader: 0 reviews	I would go with a 75mm if you still plan on upgrading in the future....

July 26th, 2007, 10:19 AM	#9
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	use the explorer one. its 65mm and its cheap. just cut off the plate that the throttle cable connects to and tack weld on the one from your car. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

July 26th, 2007, 02:33 PM	#10
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	is there a problem if you go too big? i mean within reason, you obviously wouldn't put a 80mm on a stock setup but would 70 be too big on a stock setup? __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

July 26th, 2007, 03:27 PM	#11
theninja Regular Join Date: Jul 2007 Posts: 100 iTrader: 0 reviews	Downfall of TB being too wide: Potential for more air, but you're getting less velocity. Basically, if you have a huge opening and you're on a stock motor (or a motor not setup for it), the opening will not be able to actually efficiently suck the air into the motor. Using a smaller diameter TB, the air is forced through a smaller opening and the revese pressure creates a vaacuum in the manifold. It allows the air to move through the intake manifold quicker and more efficiently. Same reason you don't run 5" exhaust from the headers-back

July 27th, 2007, 03:06 AM	#12
Rustbelt Regular Join Date: Mar 2007 Posts: 245 iTrader: 0 reviews	i've been trying to get the whole explorer set up. someone said that autos may have a problem with the explorer 65mm intake. if any one knows for sure let me know!

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: What size TB should I use?
Thread	Thread Starter	Forum	Replies	Last Post
maf size?	superman5.0	5.0 Mustangs	5	July 28th, 2007 08:06 PM
What size	scxc15	V6 Mustangs	24	May 27th, 2007 05:09 PM
What size CAI	Zellanor	2005 - 2010	1	January 25th, 2007 10:18 PM

All times are GMT -4. The time now is 02:16 AM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.

What size TB should I use?

What size TB should I use?

Re: What size TB should I use?