Differences between the TPI and LT1 throttle bodies? - Third Generation F-Body Message Boards


TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

Differences between the TPI and LT1 throttle bodies?

Reply
 
Thread Tools Search this Thread
Old 05-14-2002, 09:33 PM   #1
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
Differences between the TPI and LT1 throttle bodies?

What's the difference between the TPI and LT1 throttle bodies and if there is a difference, can I make an LT1 TB work on my TPI and how? Thanks in advance.
86TpiTransAm is offline   Reply With Quote
Old 05-14-2002, 10:26 PM   #2
Senior Member
iTrader: (1)
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
The only differance is the connectors for the IAC, TPS sensors and the throttle cable.
John Millican is offline   Reply With Quote
Old 05-15-2002, 01:14 PM   #3
Senior Member
 
Join Date: Aug 2001
Location: Orygun
Posts: 2,747
I believe the LT1 TB throttle cable has a pully type setup and pulls over the top
tpi_roc is offline   Reply With Quote
Old 05-15-2002, 06:33 PM   #4
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
Any more info?? What's different about the IAC and TPS connections and the throttle cable? How can I modify it to work with my TPI?
86TpiTransAm is offline   Reply With Quote
Old 05-15-2002, 07:59 PM   #5
Senior Member
iTrader: (1)
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
Tell us what's going on what and why and we'll help.

I say this because there is no differance in either from a performance point of view.
John Millican is offline   Reply With Quote
Old 05-15-2002, 08:57 PM   #6
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
The reason I'm thinking of doing it has nothing to do with performance. It's going on my TPI 350 motor. My current TB is having issues with the spring on the throttle return. The throttle lever won't snap back fully to the throttle stop. I have two universal throttle return springs hooked up right now just so the throttle will snap all the way back and I won't idle at 1500rpms.

Anyhow, I know a guy with 3 LT1 throttle bodies and he said I could have one for free so my feeling is, why pay for a TPI TB when I can get an LT1 TB for free. IF there's any way to make it work. Thanks.
86TpiTransAm is offline   Reply With Quote
Old 05-15-2002, 09:07 PM   #7
Supreme Member
iTrader: (9)
 
BOTTLEDZ28's Avatar
 
Join Date: Sep 1999
Location: Mass
Posts: 3,722
if you are getting it for free then take it. try it out and let all of us know what the differences are and include pics if possible.
BOTTLEDZ28 is offline   Reply With Quote
Old 05-16-2002, 05:40 AM   #8
Senior Member
iTrader: (1)
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
OK '86TPI, I totally understand now. Here's what you will need.

1. IAC connector from a LT1 wire harness
2. TPS connector from a LT1 wire harness
3. LT1 throttle cable

The connectors you may be able to find at PepBoys, they have a whole isle of electrical, cost about $10 EACH! You will have to splice the new connectors into your TPI wire harness after cutting off your old connector unless you have the tool to de-pin the connectors. I am not sure but the wire colors might be the same, if not you will need a book for each car and verfiy wires.
If you need to buy both books then the cost is climbing....

Now you will have to mod the throttle cable bracket somehow because the LT1 bracket is much closer and has a large square hole for the throttle cable to go through, the LT1 throttle cable has a small square hole....more cost and time.

Your up to about $60 now you still need to buy gaskets and make it work. My suggestion is to watch the "for sale" board and get someone's stock TB when they upgrade to a 52 or 58mm TB. You should be able to get a used TPI TB for $25-50.
Also could try www.ebay.com
John Millican is offline   Reply With Quote
Old 05-16-2002, 11:32 AM   #9
Member
 
Join Date: Jul 1999
Location: md.
Posts: 326
One other thing to mention is that the LT1 TB will not have a vacuum source for the EGR. You wil have to rtap in somewhere else for this.

I installed a LT1 style 58 mm TB on an L-98 many years ago. I can't remember all the details, but with a little modifications it can work.
Kevin G is offline   Reply With Quote
Old 05-16-2002, 03:34 PM   #10
Senior Member
iTrader: (1)
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
Vaccum source for the EGR? I'm sure you mean the valve cover vent...
John Millican is offline   Reply With Quote
Old 05-16-2002, 09:17 PM   #11
Senior Member
 
Join Date: Apr 2000
Location: chi-town
Posts: 1,711
no he DOES MEAN the EGR

there is a SMALL vacuum port on the bottom of the TB that goes to the EGR in the middle of the TPI intake
89ProchargedROC is offline   Reply With Quote
Old 05-16-2002, 09:19 PM   #12
Senior Member
iTrader: (1)
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
Quote:
Originally posted by 89ProchargedROC
no he DOES MEAN the EGR

there is a SMALL vacuum port on the bottom of the TB that goes to the EGR in the middle of the TPI intake
I see now, I never noticed that before, mine is capped. I have been without an EGR so long it slipped my mind.
John Millican is offline   Reply With Quote
Old 05-17-2002, 08:04 PM   #13
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
Thanks John for the advice. I think what I'll do since it seems like such work is get the LT1 TB for free and then sell it somewhere like ebay motors and then use that money to get a good used TPI TB Works for me! Thanks again.
86TpiTransAm is offline   Reply With Quote
Old 05-17-2002, 10:25 PM   #14
Member
 
Join Date: Jun 2001
Location: Michigan
Posts: 355
We'll see how this turns out. My digital camera is a piece of crap , but here goes. This is the LT-1 TB. Most of you already know what the TPI TB looks like.
Attached Thumbnails
Differences between the TPI and LT1 throttle bodies?-lt1.jpg  
rockind78 is offline   Reply With Quote
Old 05-17-2002, 10:40 PM   #15
Member
 
Join Date: Jun 2001
Location: Michigan
Posts: 355
Here is the other end:
Attached Thumbnails
Differences between the TPI and LT1 throttle bodies?-svi_0076.jpg  
rockind78 is offline   Reply With Quote
Old 05-18-2002, 02:34 PM   #16
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
What year LT1 TB is that? If I'm not mistaken, the first model which would have been '93 looked more like the TPI TB on the throttle side because they used the 4L60 tranny which still used the TV Cable. After GM, switched to the 4L60E in either '94 or '95, the TV Cable was gone and they switched to the throttle bracket like the one you show in your picture. I could be wrong.
86TpiTransAm is offline   Reply With Quote
Old 05-19-2002, 01:28 AM   #17
Member
 
Join Date: Jun 2001
Location: Michigan
Posts: 355
lol.........you just answered my question. I was wondering what year it was!!! I thought the guy I bought it from said '95, so what you said would make sense. I hope this it at least kind of answers your question.
rockind78 is offline   Reply With Quote
Old 05-19-2002, 02:25 PM   #18
Supreme Member
Thread Starter
 
Join Date: Dec 2000
Location: Springfield, MO, USA
Posts: 1,536
Thanks! I know the later LT1s and the LS1s had the throttle cable bracket like the one on your TB.
86TpiTransAm is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
new to tuning Azrael91966669 DIY PROM 26 06-20-2017 04:04 AM
Aje complete tube front end setup, aerospace brakes complete lsx turbo setup Terrell351 Engine/Drivetrain/Suspension Parts for Sale 4 01-18-2016 10:35 AM
Missing diverter valve? lakeffect2 Cooling 11 08-23-2015 08:44 AM
No fuel from my Injectors/ Won't start/Almost no noid light justin57 TBI 30 08-20-2015 07:05 PM
Throttle cable options tpi ZZ42Fast TPI 4 08-10-2015 08:20 PM


Go Back   Third Generation F-Body Message Boards >

Tags
2000, 86, body, difference, differences, injection, jeep, location, lt1, motor, port, throttle, tpi, tuned, valve, wrangler

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


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 11:35 PM.


All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: