Larger/Bored TB? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 12-03-2004, 06:00 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Apr 2004
Posts: 4,816
Thanks: 0
Thanked 0 Times in 0 Posts
GonneVille is on a distinguished road
Default Larger/Bored TB?

I saw something about this somewhere and was wondering where you could GET a larger TB for a Series 1, or how much the TB would have to be enlarged to show a gain?
Would you need to reprogram the PCM for a larger TB, and could you avoid this by boring the stock TB?
GonneVille is offline   Reply With Quote
Old 12-03-2004, 06:38 PM   #2
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default Re: Larger/Bored TB?

Quote:
Originally Posted by GonneVille
I saw something about this somewhere and was wondering where you could GET a larger TB for a Series 1, or how much the TB would have to be enlarged to show a gain?
Would you need to reprogram the PCM for a larger TB, and could you avoid this by boring the stock TB?
You won't be able to 'get' a larger throttlebody.
You could grind out the center post and smooth transitions out with metal epoxy.
The maf will be completely exposed so some afc tuning would most likely be needed.
Or you could just cut out half the post like Dame***(forgot spelling) did.
And the only way your gonna make your plate size bigger is having a machine shop bore it out and get a new plate.
You probably shouldn't go much more and a few mm over and remeber you have to match up your */c to the same bore size of the TB.
Sucks there'* nothing readily available but it'* still possible.
95naSTA is offline   Reply With Quote
Old 12-07-2004, 02:20 AM   #3
Junior Member
 
Join Date: Dec 2004
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
tiny5050 is on a distinguished road
Default

Some are installing the larger throttle body from the Northstar engines, 75mm vs 68 mm. Several kits out there but $$$. Will need reprogramming of the computer, higher flow cam or rockers, etc to take advantage of the increased size. For serious tuners only in my opinion.
tiny5050 is offline   Reply With Quote
Old 12-07-2004, 10:46 AM   #4
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

those above kits are only for the series 2
95naSTA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
The MOS family may have just gotten larger... MOS95B Lounge 36 08-08-2006 08:57 PM
Larger Tensioner vs Smaller Belts Mortehl Forced Induction 47 01-16-2006 01:51 AM
Larger brakes (92-99) on a 1987-1991? OLBlueEyesBonne Performance, Brainstorming & Tuning 0 04-16-2005 06:15 PM
ZZ PERFORMANCE MINI AFC AND A LARGER TB Forced Induction 8 05-27-2003 08:03 PM
HP gains on larger TB? 93-SSEI- Performance, Brainstorming & Tuning 15 02-26-2003 05:36 AM


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 Off
Refbacks are Off



All times are GMT -4. The time now is 05:20 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.