Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation III External Engine
Sign in using an external account
Register Forgot Password?
Register iTraderTimeslips Photos Members Search Today's Posts Mark Forums Read Used CarsVendor Directory
Search

Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 11-18-2007, 08:37 PM   #1
Teching In
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2006
Location: San Antonio, TX
Posts: 5
Default Throttle body size

so, the 2002's T/A 's had the LS6 intakes. i've read somewhere (tho i can't find it anymore) that the TB size is a 70mm, and the LS6 intake can take up to 75mm... anyone have info to confirm/deny this?
NetrixTardis is offline   Reply With Quote
Old 11-18-2007, 09:32 PM   #2
TECH Apprentice
Garage is empty, add now
 
mikenews's Avatar
 
Trader Rating: 9
Join Date: Aug 2007
Location: Buffalo NY
Posts: 398
Default

Factory tb is about 72mm. We remove the restrictive .0120" ridge and just about achieve 75mm total opening when we port them. The actual opening is larger but not sure how much. Anyone???
__________________
98 Z28 34K on the odometer, A4 , SLP LID, Magnaflow cat back, TB bypass, P&P TB, Vinci / Crane Tuner, FTA, Strano lowering springs, BMR LCA's, panhard and relocation brackets, and 3.42 gears.
mikenews is offline   Reply With Quote
Old 11-18-2007, 10:01 PM   #3
Teching In
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2006
Location: San Antonio, TX
Posts: 5
Default

hmm. so, whats the largest size that the LS6 intake will bolt up with?
NetrixTardis is offline   Reply With Quote
Old 11-19-2007, 11:21 AM   #4
TECH Apprentice
Garage is empty, add now
 
mikenews's Avatar
 
Trader Rating: 9
Join Date: Aug 2007
Location: Buffalo NY
Posts: 398
Default

I believe 90mm. I would just have your factory ported and polished. Save your $ for other mods. Factory TB's modified work very well!
__________________
98 Z28 34K on the odometer, A4 , SLP LID, Magnaflow cat back, TB bypass, P&P TB, Vinci / Crane Tuner, FTA, Strano lowering springs, BMR LCA's, panhard and relocation brackets, and 3.42 gears.
mikenews is offline   Reply With Quote
Old 11-19-2007, 01:01 PM   #5
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

So what is the official throttle body size?

Anyone got a picture?
5.0stang is offline   Reply With Quote
Old 11-19-2007, 03:12 PM   #6
Restricted User
Garage is empty, add now
 
Trader Rating: 183
Join Date: May 2006
Location: Schaumburg, Il
Posts: 467
Default

After porting a stock tb is a true 75mm all the way through. From factory they are right around 71.5mm. An ls6 intake opening is 78mm so with anything larger than that you would have to use a reducer, this making it pointless going larger since the air has to restrict to get into the intake. Ported stocker and ls6 is a proven combo, next is to step up to a 90/90.
Smokin87TA is offline   Reply With Quote
Old 11-19-2007, 04:25 PM   #7
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

So I am assuming the small part of the throttle body is on the firewall side, or on the radiator side?

What horsepower are the ported 75mm throttle bodies good too?
5.0stang is offline   Reply With Quote
Old 11-20-2007, 12:25 AM   #8
Launching!
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2006
Posts: 272
Default

If you take off the TB, you will see a lip that goes all the way around. It is very noticable. Take the TB apart, grind this lip off and smooth it out. It's easy and should pick you up 5 to 10 rwhp depending on your current mods.
__________________
1998 Formula Firehawk.
mypoorLS1 is offline   Reply With Quote
Old 11-20-2007, 07:23 AM   #9
Internet Mechanic
2002 Pontiac Trans Am
 
BlackScreaminMachine's Avatar
 
Trader Rating: 17
Join Date: May 2005
Location: Wallingford CT
Posts: 9,835
Default

Quote:
Originally Posted by NetrixTardis View Post
hmm. so, whats the largest size that the LS6 intake will bolt up with?
Best bud put on a FAST 78mm TB, works fine. He kinda regrets since he cant use it unless he stayed with a 78mm FAST intake, he wants a 90mm, but im sure he can sell it.
__________________
2002 NBM Trans Am SOLD!

http://ls1tech.com/forums/vehicle-cl...l#post17273103
BlackScreaminMachine is offline   Reply With Quote
Old 11-20-2007, 11:39 AM   #10
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

Has anyone flowed a stock and ported throttle body?

So is the official size 71.5mm?
5.0stang is offline   Reply With Quote
Old 11-20-2007, 06:36 PM   #11
TECH Apprentice
Garage is empty, add now
 
mikenews's Avatar
 
Trader Rating: 9
Join Date: Aug 2007
Location: Buffalo NY
Posts: 398
Default

Do a search for that issue. Bo white polishes and ports them. Gains of 5-8 rwhp on dyno is not uncommon. I think his website is portsculptors.com
__________________
98 Z28 34K on the odometer, A4 , SLP LID, Magnaflow cat back, TB bypass, P&P TB, Vinci / Crane Tuner, FTA, Strano lowering springs, BMR LCA's, panhard and relocation brackets, and 3.42 gears.
mikenews is offline   Reply With Quote
Old 11-20-2007, 09:01 PM   #12
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

I tried
5.0stang is offline   Reply With Quote
Old 11-26-2007, 06:40 PM   #13
TECH Fanatic
Garage is empty, add now
 
barnat's Avatar
 
Trader Rating: 59
Join Date: Jan 2007
Location: Pittsburgh,Pa
Posts: 1,741
Default Tb

Look under ls1 throttle bodys,!!! there is like 3 or 4 companys that cnc do them!!
barnat is offline   Reply With Quote
Old 11-26-2007, 07:46 PM   #14
Registered User
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2007
Location: Loveland, Co
Posts: 10
Default Newbie here

Ok let me ge this right. In order to have a 90 mm throttle body you have to have a 90mm intake, correct?
74chevystepside is offline   Reply With Quote
Old 11-27-2007, 12:43 PM   #15
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

So what is the official size of a stock ls1 throttle body?
5.0stang is offline   Reply With Quote
Old 11-27-2007, 12:48 PM   #16
MASS seller approved
Garage is empty, add now
 
smok'nZ's Avatar
 
Trader Rating: 154
Join Date: Apr 2006
Location: OKLAHOMA
Posts: 1,920
Default

Quote:
Originally Posted by 5.0stang View Post
So what is the official size of a stock ls1 throttle body?

71.5 read the thread
__________________
2001 Tahoe
99 TA 408ci th400
smok'nZ is offline   Reply With Quote
Old 11-30-2007, 04:24 PM   #17
On The Tree
Garage is empty, add now
 
Trader Rating: 1
Join Date: Sep 2007
Posts: 107
Default

Quote:
Originally Posted by smok'nZ View Post
71.5 read the thread
Um, I did.

I just got answers that said "about" and they varied.

So I was wanting to know the official size, confirmed.
5.0stang is offline   Reply With Quote
Old 11-30-2007, 04:33 PM   #18
TECH Resident
Garage is empty, add now
 
3rdgentug's Avatar
 
Trader Rating: 21
Join Date: Jul 2005
Location: memphis, tennessee
Posts: 793
Send a message via Yahoo to 3rdgentug
Default

ive always read/heard 71.5 refered to as a 72mm

i used ported 78mm on my intake for years, worked great.
__________________
1999 Z28 -425RWHP/386RWTQ - sold
1967 pro touring - in progress.
408 / 4l80 / BW S480 / Currie 9 - 3.25 trutrac
- weekend warrior shooting for 1000 HP
2001 xtreme blazer : 5.3 w/ ls6 cam ls1 intake
3200 stall 4l80. C6 rims. - bought/sold/bought back
1993 GMC Typhoon - sold not missed
2002 4.3 xtreme - stock DD
3rdgentug is online now   Reply With Quote
Old 11-30-2007, 04:33 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
body, ls1, ls1throttle, ls1throttlebodysizes, ls6, size, throttle


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 10:22 AM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.5.2
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details