C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Is this carb computer controlled?

Thread Tools
 
Search this Thread
 
Old Jul 25, 2017 | 08:32 AM
  #1  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default Is this carb computer controlled?

I'm new to the 1981 CCC thing (also just got this car). Trying to decide if this carb is computer controlled and will need to be replaced along with the distributor (I'm taking the ECU out). I know it's not the original carb and I notice there is a vacuum port missing on the back/top of it that goes to that red thing. It's a quadrajet 17085204.






Reply
Old Jul 25, 2017 | 08:43 AM
  #2  
dmaxx3500's Avatar
dmaxx3500
Team Owner
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2008
Posts: 30,894
Likes: 1,189
From: chicago
Default

and your taking the ECU out why?,what are you going to do for trans,and dash gauges?
Reply
Old Jul 25, 2017 | 08:48 AM
  #3  
jim2527's Avatar
jim2527
Race Director
20 Year Member
Liked
Top Answer: 1
Top Answer: 3
 
Joined: Apr 2003
Posts: 19,351
Likes: 654
From: Tampa, Florida
Default

Yes, that is a CCC
Reply
Old Jul 25, 2017 | 08:53 AM
  #4  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by jim2527
Yes, that is a CCC
Any idea why the port is missing on the back?
Reply
Old Jul 25, 2017 | 08:56 AM
  #5  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by dmaxx3500
and your taking the ECU out why?,what are you going to do for trans,and dash gauges?
I bought the car because I want a simple carb'd engine to play around with. Didn't know about the smog and ECU stuff until after. I've read that the trans lockup doesn't really matter (not a daily driver, don't care to much about MPG). I wasn't aware that any of the gauges went through the ECU.
Reply
Old Jul 25, 2017 | 09:50 AM
  #6  
Big2Bird's Avatar
Big2Bird
Le Mans Master
15 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Default

Originally Posted by tehjrow
I wasn't aware that any of the gauges went through the ECU.
They don't.
Reply
Old Jul 25, 2017 | 10:00 AM
  #7  
Big2Bird's Avatar
Big2Bird
Le Mans Master
15 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Default

Originally Posted by tehjrow
I'm new to the 1981 CCC thing (also just got this car). Trying to decide if this carb is computer controlled and will need to be replaced along with the distributor (I'm taking the ECU out). I know it's not the original carb and I notice there is a vacuum port missing on the back/top of it that goes to that red thing. It's a quadrajet 17085204.






That's a good looking core. Let me know if you sell it.
Reply
Old Jul 25, 2017 | 10:26 AM
  #8  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by Big2Bird
That's a good looking core. Let me know if you sell it.
Will do
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Jul 25, 2017 | 10:32 AM
  #9  
7T1vette's Avatar
7T1vette
Team Owner
15 Year Member
Community Builder
Community Influencer
Top Answer: 5
 
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Default

Not sure why you want to "play with the carb". That's the advantage of the CCC (ECM) computer controlled system on that car....the ECM does the adjusting--and does it pretty well on a working system.

I would advise you to use the car a while before just throwing stuff out that still works. You may find that you like not having to mess with it.

P.S. With that system, you can still upgrade the engine with cam, heads, pistons (if you want); and it should still work fine. That Q-Jet is capable of dumping 750 cfm into the engine (likely only puts 500+ cfm into the existing engine).
Reply
Old Jul 25, 2017 | 11:06 AM
  #10  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by 7T1vette
I would advise you to use the car a while before just throwing stuff out that still works. You may find that you like not having to mess with it.
It's for sure not something i'm going to do right away. Currently I'm taking the oil pan off to repair/replace it (has a huge dent and leaks). After that and some other minor repairs (door locks frozen, speedo cable lubing) I'm going to drive it around as is for a while (well, after I also hunt down a vacuum leak and replace the broken choke module).
Reply
Old Jul 25, 2017 | 11:12 AM
  #11  
dmaxx3500's Avatar
dmaxx3500
Team Owner
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2008
Posts: 30,894
Likes: 1,189
From: chicago
Default

start by replacing every eng vacumn line you can find
Reply
Old Jul 25, 2017 | 11:15 AM
  #12  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by dmaxx3500
start by replacing every eng vacumn line you can find
I hadn't considered just replacing them all, that sounds like a plan.
Reply
Old Jul 25, 2017 | 11:26 AM
  #13  
OldCarBum's Avatar
OldCarBum
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2016
Posts: 14,401
Likes: 8,204
From: Napa Valley California
Default

One thing to consider is whether or not you will need to get a smog certification where you live. I bought my 73 because it is smog exempt where I live. As part of my resto/mod I'm now researching some of the EFI and electronically controlled transmission options on the market rather than staying with a single carb and my TH-400.
Reply
Old Jul 25, 2017 | 01:13 PM
  #14  
tehjrow's Avatar
tehjrow
Thread Starter
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

Originally Posted by OldCarBum
One thing to consider is whether or not you will need to get a smog certification where you live. I bought my 73 because it is smog exempt where I live. As part of my resto/mod I'm now researching some of the EFI and electronically controlled transmission options on the market rather than staying with a single carb and my TH-400.
My county only goes back 25 years.
Reply

Get notified of new replies

To Is this carb computer controlled?





All times are GMT -4. The time now is 02:04 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE