C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 26 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Mid America Motorworks
Bair's Corvettes
VetteBookStore.com
CorvetteClothing.com
Volunteer Vette Products

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
ANNIV 78
corvetteron
Featured Links

Buy Now
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)


Kindle
Kindle


How To Rebuild Corvette Rolling Chassis 1963-1982
How To Rebuild Corvette Rolling Chassis 1963-1982


Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
10/22/10 8:19pm - Original Message: 'quadrajet performance'
rod7515 Lifetime Member
Lifetime Member
- Send Private Message


Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
I was wondering if there is anyone here that has upgraded the performance of their quadrajet or is it just easier to go to a holley or edelbrock? I get very good road driving ability with my quadrajet on my 74 350, and it also delivers great gas mileage but it doesnt respond as quick as I'd like it too the secondary vacuum is slow coming in. I know going to something else will effect fuel mileage but i want better response. I havent tried to make any changes with the quad yet. Was wondering if there are any websites that offer ideas and products?

Thanks
Rodney


____________________________________

 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
10/22/10 9:58pm - Reply: 'quadrajet performance'
KDADDY79
Former Member
- Send Private Message


Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

I'm not able to do a good rebuild on my own so I sent my Q-Jet out for a rebuild a few years ago.

Getting it rebuilt RIGHT meant all the difference in the world. Since then I can really feel the secondaries go to work.

I had mine rebuilt by http://www.thequadshop.net/  Great to deal with!

Stick with your Q-Jet! Thumbs Up
 
Kevin
KDADDY792010-10-22 20:00:41

____________________________________
 Reply Reply  Quote Reply w/Quote
10/23/10 4:32pm - Reply: 'quadrajet performance'
Per4mance Lifetime Member
Lifetime Member
- Send Private Message


Morganville, NJ - USA

Vette(s):
1971 350 270 hp roadster millivanilli red, black interior, white rag top, white hard top, I've had it 18 years and intend on giving it to my son for his 25th birthday(another 18 years from now)

Joined: 1/25/2009
Posts: 92
Adjust the door on the secondaries for lighter spring tension, and the secondaries will open faster. The adjustment is under the secondary door rod on the top of the carb.if you are not sure about the screw look on line and you can get a look at which one to turn......... Bill

____________________________________
 Reply Reply  Quote Reply w/Quote
10/25/10 10:38am - Reply: 'quadrajet performance'
VetteSpecialties
Former Member
- Send Private Message


Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
Posts: 1031
Remember the secondaries are supposed to come in as the engine can support the additional airflow.  It is not necessarily a good thing to make them open faster.  Overall engine condition and tune must first be addressed, then carb adjustments checked.  Then worry about a rebuild.

Larry


____________________________________
Corvette Specialties is your best source for Corvette parts, accessories and gifts. www.CorvetteSpecialties.com

   





 Reply Reply  Quote Reply w/Quote
10/25/10 11:06am - Reply: 'quadrajet performance'
dskopp
Former Member
- Send Private Message


Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
Rodney, send me a PM with your email address and I can send you some info on the Q-Jet that may help you !!
Dan


____________________________________
          



(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
10/26/10 1:56pm - Reply: 'quadrajet performance'
yostusota
Former Member
- Send Private Message


York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
Hey Rodney if you are free this weekend maybe we can get together and tweak the secondary or the accelerator pump..I am not going anywhere this weekend so it would work for me to tune it a little if need be..it would be fun to do before CFC.
Rich

____________________________________

My first parade at Carlisle 2010
 Reply Reply  Quote Reply w/Quote
10/26/10 9:10pm - Reply: 'quadrajet performance'
rod7515 Lifetime Member
Lifetime Member
- Send Private Message


Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
Rich, Appreciate the offer but this weekend is the guys golf trip. We leave Thursday for 4 days off golf food and rest! The first weekend I have free is the weekend of the 11th. Maybe then we can give it a shot if your free. Thanks
Rodney


____________________________________

 Reply Reply  Quote Reply w/Quote
10/27/10 11:03am - Reply: 'quadrajet performance'
yostusota
Former Member
- Send Private Message


York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
Hey Rodney that sounds great on the 11 th..would be fun.
Rich
 


____________________________________

My first parade at Carlisle 2010
 Reply Reply  Quote Reply w/Quote
10/27/10 11:04pm - Reply: 'quadrajet performance'
lbbounder
Former Member
- Send Private Message


Owensboro, KY - USA

Vette(s):
1977 Coupe; yellow, 4 speed, one option car with original engine

Joined: 9/9/2007
Posts: 138
OK, so when I mash the accelerator there is a stumble... and fuel mileage seems to have decreased. You say this guy is good ay rebuilding Q-jets. ...been contemplating switching to Holley.

____________________________________
current
1996 Grand Sport
1977 Coupe
 
gone but not forgotten
1984 coupe
1974 coupe
1964 roadster

 Reply Reply  Quote Reply w/Quote
10/27/10 11:24pm - Reply: 'quadrajet performance'
rod7515 Lifetime Member
Lifetime Member
- Send Private Message


Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
Joe, Rebuilding the carb is not that hard of a job. These carbs are not that difficult to make them run good. I am looking to get more of a high performance response with mine and that is not the standard set up. The reason I would like to stay with the quadrajet is because when just driving out on the road the economy is better then anything I think you can get. You can certainly get rid of your stumble as long as you have a good carb to work with. And yes tuneup could also play a major part in the stumble as well. Good luck.
Rodney


____________________________________

 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30