Fuel injection
Had a 1976 L-82, 4-sp
Joined: Mar 2011
Posts: 5,338
Likes: 1,213
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
If a car cruises at 60 mph for say two hours, the efi will maintain the afr at say 14.7:1. That will give a good return on mpg. If the carb is setup with the primary jets selected to attain an afr of 14.7:1 at 60 mph for two hours, do you think there will be a difference in the mpg? Nope. The engine cylinders don't care how the air and fuel is mixed up above, they just want the mixture to be 14.7:1 to give the best mpg. The advantage of efi over carbs is that it can better adjust the afr during periods of transition during acceleration and deceleration. But at a steady speed, not a big difference between carb and efi. This is why a well tuned carb can perform nearly as well as efi. My 750 dp without a choke in summer weather will start with a quick shot of gas and run on it's own after a few seconds. But the efi would be more efficient for my cold starts and would save a bit of fuel during warm up. I do care about gas mileage but I don't expect the moon with 450+ hp, 4-speed and a 4.11 rear end.
Instructor
Joined: Mar 2006
Posts: 222
Likes: 3
From: Campbell CA
Be careful which hose you choose. I replaced mine with -8AN hose a few years ago. Last week there was a puddle under the car. Gas was seeping thru the walls of the hose. Old AN hose and new pump gas formulations don't mix....
Burning Brakes
Joined: Aug 2016
Posts: 1,000
Likes: 283
From: New York
You shouldn't use braided AN hose unless it's PTFE lined, the normal stuff is breathable and not should be used. I prefer black PTFE rubber hose, very easy to work with, no pressure issues or your garage smelling like gas...use that with the press fittings and you should be good to go.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Pro-jection was an analog 80's thing and then the digital Pro-jection systems were rather basic 90's systems. All introduced a good 20 years ago.
The C5 came from GM at a slightly later time and they have discontinuing quite a few parts in from it. I think even some parts from the earlier C6's are being discontinued.
Time moves on and old stuff become impractical to support. Part of the reason is because they come up with newer stuff that is more complex, capable, smaller, cheaper or any other combination of such that applies..
Burning Brakes
Joined: Feb 2008
Posts: 1,168
Likes: 17
From: Iowa
I ran a EZ EFI on my roller cammed 383 for about five years, and am going back to a tuned Q-jet. Worked great for periods of time, till it doesn't work and you take a flat bed ride home. I have never had a carb leave me dead on the road. Going old school carb and HEI. I can diagnose in minutes and walk into a parts store and walk back out with parts to fix it instead of ordering on line and waiting.
Last edited by tixeon; Aug 11, 2019 at 09:39 PM.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
I have FOUR 1227730 and carry a spare in the car, I rotate them every few months, no hard schedule....just to keep the capacitors in the electronics happy......junkyard picks for 5-10 bux each, back when.....
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
Pro-jection was an analog 80's thing and then the digital Pro-jection systems were rather basic 90's systems. All introduced a good 20 years ago.
The C5 came from GM at a slightly later time and they have discontinuing quite a few parts in from it. I think even some parts from the earlier C6's are being discontinued.
Time moves on and old stuff become impractical to support. Part of the reason is because they come up with newer stuff that is more complex, capable, smaller, cheaper or any other combination of such that applies..
The C5 came from GM at a slightly later time and they have discontinuing quite a few parts in from it. I think even some parts from the earlier C6's are being discontinued.
Time moves on and old stuff become impractical to support. Part of the reason is because they come up with newer stuff that is more complex, capable, smaller, cheaper or any other combination of such that applies..
Melting Slicks
Joined: Nov 2017
Posts: 2,358
Likes: 519
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Racer
Joined: Jul 2018
Posts: 411
Likes: 232
From: central Florida
2023 C3 of the Year Finalist - Modified
2020 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (track prepared)
Not knowing your car's setup, so forgive if I suggest something you've already done. If you have a new-ish carb and the car runs good on it, I doubt I would suggest spending $1200-1500 for an EFI/line/pump. I'd just make sure all my fuel lines were good and spend a little time chasing the fuel vaporization/heat soak that you are getting. Reroute the lines, insulate them and/or maybe wrap the headers or ceramakote them.
Disclaimer.. I have a Holley Sniper and LOVE it. My car had an old PowerJectionIII unit which was failing and obsolete. Since I already had AN lines, wiring, and an electric fuel pump, the Sniper kit was a no brainer. If I had a good Carb on the car when I purchased there is no way I'd have spent the money at that time.