78 L82 carb upgrade
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
78 L82 carb upgrade
need some help. i want to replace the original factory quad-jet, and upgrade to an aftermarket carb that will bolt on to the factory alumminum intake. anybody have any suggestions?
oh yeah,removed all the emmision garbage but have not removed the EGR valve yet, cant find a plate to bolt in place to cover hole. any thoughts on this?
oh yeah,removed all the emmision garbage but have not removed the EGR valve yet, cant find a plate to bolt in place to cover hole. any thoughts on this?
Drifting
Joined: Aug 2006
Posts: 1,694
Likes: 0
From: Oregon
Since you pitched all the emission garbage, first off, DON'T THROW ANY OF IT AWAY!. Take off the original EGR manifold and go with a Edelbrock 2101 or 2701 manifold ( $120. ) and a 1406 carb. ($230) Use the Edelbrock drop base air cleaner ($30.) and you will be very happy!
Just my own opinion
Just my own opinion
Race Director
Joined: Jun 2000
Posts: 10,051
Likes: 677
From: FL
Get an Edelbrock 2101 and bolt the Q-Jet back on.
The Q-Jet is a 750cfm carb, the Edelbrock 1406 is a 600cfm carb. Your car may feel more responsive but you will be down on HP. A well tuned Q-Jet can support over 400HP.
The only performance increase you will see with an aftermarket carb on a stock engine is a lighter wallet.
The Q-Jet is a 750cfm carb, the Edelbrock 1406 is a 600cfm carb. Your car may feel more responsive but you will be down on HP. A well tuned Q-Jet can support over 400HP.
The only performance increase you will see with an aftermarket carb on a stock engine is a lighter wallet.
Burning Brakes
Joined: Dec 2002
Posts: 1,069
Likes: 2
From: Sherwood Park AB
need some help. i want to replace the original factory quad-jet, and upgrade to an aftermarket carb that will bolt on to the factory alumminum intake. anybody have any suggestions?
oh yeah,removed all the emmision garbage but have not removed the EGR valve yet, cant find a plate to bolt in place to cover hole. any thoughts on this?
oh yeah,removed all the emmision garbage but have not removed the EGR valve yet, cant find a plate to bolt in place to cover hole. any thoughts on this?
Race Director
Joined: Feb 2005
Posts: 16,100
Likes: 17
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
carb replace
Yes rexx, the numbers are 17058211, had some trouble reading them, they were in a little circle on back of the carb, had to put my glasses o n to read them. and the car is a 78 L82 4 speed.
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
carb intake replace
all of the emmision garb has been taken off and stored away in tubs with the rest of parts i have collected over the years,even manage to get air tubes off in one peice. was doing a lot of internet search on the Q/J and yes it is a 750 cfm, but the engine is not using all of it, found out from lars that the secondarys are only 3/4 open at around 5500 rpm, and yes the carb can be tuned, but takes a lot of work and patience to get right.Edelbrock performer EPS #2701 works great on the 350, and adding the performer 600cfm #1406 increases torque and HP considerably plus it will fit under stock hood, so i ordered it today. i do appreciate all of the feed back though, as for selling the Q/J im not sure can always use again if unhappy with edelbrock carb, but everything is alaways for sell, make me an offer i cant refuse and i will think on it. I will keep everyone posted on how the new combo works.
Drifting
Joined: Aug 2006
Posts: 1,694
Likes: 0
From: Oregon
No matter what anyone tells you, I like my 2701 and 1406 Edelbrock setup. As for the lost HP, I can smoke my tires without trying! No lost HP here! Good luck! As you can see, it all fits under the stock hood. Picture below is with HOOD SHUT.
As for my stock Q-Jet, big $$$ getting it rebuilt. Ive had it done twice in 70k miles. The new Edelbrock was much less than the rebuild.... I did the 260hp crate 3 year 100k mile warranty.. Very happy and I can drive it ANYWHERE on Unleaded 87 without any "ping".
As you can see, it all fits under the stock hood. Picture below is with HOOD SHUT.As for my stock Q-Jet, big $$$ getting it rebuilt. Ive had it done twice in 70k miles. The new Edelbrock was much less than the rebuild.... I did the 260hp crate 3 year 100k mile warranty.. Very happy and I can drive it ANYWHERE on Unleaded 87 without any "ping".
Last edited by 3rd_Vette; Feb 27, 2007 at 03:54 AM.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
You might find this interesting.
CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
Q-Js are not difficult to tune/setup.
Yes, the 750 rating is not relevant or used on mild 350s- Q-Js were used on up to 500 c.i. Remember a carb is a responsive device.
CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
Q-Js are not difficult to tune/setup.
Yes, the 750 rating is not relevant or used on mild 350s- Q-Js were used on up to 500 c.i. Remember a carb is a responsive device.
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
carb debate
yes a carb is a responsive device, to the amount of air that is drawn in,but some respond better than others, the Q-J is a good carb but to get the most out of it requires a lot of time and money, plus it is not easy to set up,i think you would agree with that and performance parts are not as easily available. the Q-J has its place and serves its purpose well, but i do beleive a good performance carb will out perform, and is more consistant. performance carbs can be tempramental at times, but can be tuned much easier. Like i said earlier i ordered the performer EPS intake #2701, and performer 600 cfm carb #1406, and they should be here wednesday thursday, and will let everyone know ASAP how the performance works out.
Race Director
Joined: Jun 2000
Posts: 10,051
Likes: 677
From: FL
Q-Jet rebuild kit $20
Q-Jet jets and rods $25
20 mpg and 380 hp - priceless.
The Edelbrock carb is a clone of the old Carter AFB. The AFB was the base carb used by GM before they changed over to the Q-Jet. GM changed over for a reason.
Like I said before, your car may be more responsive but don't expect to be any faster. And, you will be using more gas for the same or less performance.
Q-Jet jets and rods $25
20 mpg and 380 hp - priceless.
The Edelbrock carb is a clone of the old Carter AFB. The AFB was the base carb used by GM before they changed over to the Q-Jet. GM changed over for a reason.
Like I said before, your car may be more responsive but don't expect to be any faster. And, you will be using more gas for the same or less performance.
Race Director
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
I have the Edelbrock Performer intake with the 1406 carb right now on my '80 4-speed car. I'm currently trying to get a Qjet on the car so I can run the stock dual snorkel air intake. I have the open element drop base Edelbrock, but I want to pull fresh air from in front of the radiator.
As mentioned earlier, with this setup I have no trouble with power. It's just not the setup I want currently.
As mentioned earlier, with this setup I have no trouble with power. It's just not the setup I want currently.
Melting Slicks
Joined: May 2005
Posts: 2,209
Likes: 12
From: Montgomery Alabama
Cruise-In VII Veteran
St. Jude Donor '06
Just because GM changed their supplier, doesn't mean they made the right decision. Just look at the C4
. (Just kidding).I ran a Q-jet for years on my race car, and spent thousands keeping it tuned and working. Because GM used the Q-jet for production cars, I couldn't use a Carter. I wish I had all that money back now...
Race Director
Joined: Jun 2000
Posts: 10,051
Likes: 677
From: FL
From Ganey's link (emphasis mine). All carbs were tuned and jetted. In fact, the Q-Jet was probably at a disadvantage due to the adapter:
TQ .................HP same +/-1
343 @ 5000 ... 349 @ 6000 ... Q-J JET Perf. ADAPTER used.
328 @ 4800 ... 351 @ 6100 ... Holley 600
329 @ 3900 ... 351 @ 6100 ... Edelbrock 600 1405
327 @ 4000 ... 350 @ 6100 ... Edelbrock 750 1407
Torque wins stoplight races. I'll take the extra 4%.
TQ .................HP same +/-1
343 @ 5000 ... 349 @ 6000 ... Q-J JET Perf. ADAPTER used.
328 @ 4800 ... 351 @ 6100 ... Holley 600
329 @ 3900 ... 351 @ 6100 ... Edelbrock 600 1405
327 @ 4000 ... 350 @ 6100 ... Edelbrock 750 1407
Torque wins stoplight races. I'll take the extra 4%.
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
From Ganey's link (emphasis mine). All carbs were tuned and jetted. In fact, the Q-Jet was probably at a disadvantage due to the adapter:
TQ .................HP same +/-1
343 @ 5000 ... 349 @ 6000 ... Q-J JET Perf. ADAPTER used.
328 @ 4800 ... 351 @ 6100 ... Holley 600
329 @ 3900 ... 351 @ 6100 ... Edelbrock 600 1405
327 @ 4000 ... 350 @ 6100 ... Edelbrock 750 1407
Torque wins stoplight races. I'll take the extra 4%.
TQ .................HP same +/-1
343 @ 5000 ... 349 @ 6000 ... Q-J JET Perf. ADAPTER used.
328 @ 4800 ... 351 @ 6100 ... Holley 600
329 @ 3900 ... 351 @ 6100 ... Edelbrock 600 1405
327 @ 4000 ... 350 @ 6100 ... Edelbrock 750 1407
Torque wins stoplight races. I'll take the extra 4%.
Thread Starter
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
They also stopped making convertibles, the big block engine, chrome bumpers, and a lot of things we like about the Corvette in the mid 70's.
Just because GM changed their supplier, doesn't mean they made the right decision. Just look at the C4 . (Just kidding).
I ran a Q-jet for years on my race car, and spent thousands keeping it tuned and working. Because GM used the Q-jet for production cars, I couldn't use a Carter. I wish I had all that money back now...
Just because GM changed their supplier, doesn't mean they made the right decision. Just look at the C4
. (Just kidding).I ran a Q-jet for years on my race car, and spent thousands keeping it tuned and working. Because GM used the Q-jet for production cars, I couldn't use a Carter. I wish I had all that money back now...
