You might be able to cut the fuel under certain coasting conditions, esp if engine RPM is higher. The Fox-body EFI have some algorithms that determine when fuel can shut off, 1 in particular requires engine RPM to be above 1500rpm, IIRC. If coasting on a long hill, shifting to a lower gear might be required to get the fuel cutoff and a little bit of fuel saved.

Thanks!

A lot of good points. Electrical glitches can absolutely show up with fuel injection, while a carb is very mechanical and much less chance of a random failure. When I say the EFI is easier to tune, things like AFR adjustments can be done in seconds vs the time and effort to change jets. Same with timing, i don't have to remove the dizzy and change springs or have a timing light hooked up to check what I've done. But as mentioned in the video, for the most part all tuning necessary to get the engine performing right can be done on a carb or with the efi, just a different way of getting there. Like you said, its always easier when you are familiar with whatever system.

For someone thinking of going efi.. I totally agree and I'm a 60s guy and will never give up the old school but man that efi just got to find a way into my budget 😂😂👍🏼

I agree about the choke. With a well tuned carb & correctly set choke I can easily start my old cars in any weather. For late model daily drivers, I like EFI. But for me part of the old car experience is the simplicity of things.

As an older guy, I have to agree with steves759's points about the stability of the carburetor compared to the massive potential (and very difficult to pinpoint) problems that can crop up with an EFI setup. I can speak solidly about both as I have extensive automotive electronic control system experience having only recently retired from the field. A little over thirty years have passed since I was heavily into drag racing full-bodied cars as well as a rail. Believe me, when you spend many, many successive weekends at the drag strip testing and tuning your way through each weekend, you have to get good at dealing with the mechanical tune-up issues. Since you've already conceded that once they are tuned properly, both induction systems perform very similarly. But, from the standpoint of reliability, you would be hard-pressed to find a more reliable intake system than a correctly chosen carburetor and the correct intake manifold sitting on top of a well-balanced, well-planned engine. The very biggest rap on carbs has very little to do with the carburetor itself, but rather the incorrect selection of a carb for the given application. Without researching and carefully planning EVERYTHING when building a performance power plant (which includes choosing the right pistons, camshaft, cylinder head setup, intake manifold, ignition system, spark plugs, etc.), the carburetor is often blamed when the performance isn't what it was expected to be. Working with an EFI system's seemingly infinite electronic controls will often allow just enough adjustability to make a lot of mismatched combinations function almost as expected, but do not expect that it will take less time to get there than matching things up from the beginning would've taken. Plus, it will never be as good as it could be if the right preparation steps were followed from the outset. The thing that bothers me about the EFI systems is that, unlike a mechanical system, when you have an electronic failure, most often they are difficult to find. Is it a software issue? Is it a power issue? Is it a connection problem? Have I lost a sensor? Or, worse yet, is there some type of mechanical problem causing the EFI system to misbehave? Having worked for many years with these types of problems on production vehicles with many, many thousands of replicated versions of them out there to reference from, I can only imagine just how difficult trying to find some type of similar issues with a vehicle that is completely custom where no other vehicle is using that exact combination. I'll admit that I am "old school" when it comes to performance vehicles, but I absolutely LOVE the fuel injection system on my family vehicle. Still, I don't see any good reason to depart from the tried and true intake systems that have been extinct from U.S. production vehicles for over thirty years. But in spite of what many might think of as a "prejudice viewpoint" I want to commend you for the work that you did to put this together. I know it wasn't easy and it wasn't quick. I'm not even trying to alter your conclusions, just wanted to throw in my 25 cents worth of opinion based on my experience. Good Job!!!

NOWADAYS ITS THE CHEAP CHINESS ELCTRONICS IN EVERYTHING! A CARB WILL GET YOU HOME!

In your opinion, what are some of the cons. Did you habe it tuned or did you program the system yourself ?

@@arodderz con(s) are if something is wrong with the throttle body unit you cant just buy a rebuild kit like you can with a carb, you have to send the unit back to fitech. You also have to wire the system into your ingition system so its not a straight forward bolt on. I am not familiar with tuning or laptops and my system hasnt been self leaning as it runs rich all the time. If a sensor goes it would take awhile to track it down. In short, if it works well, it runs better than a carb but if there are issues, its harder to track them down and fix if youre not familiar with digital tuning. You also have to make sure your ignition box/system and distrbutor are efi compatible.

@@doubledave7451 got it. Thank you.

@@doubledave7451 Thanks for this comment, I have a 496 as well with a holley street avenger, I was looking at the 850s tonight but was checking this comment... I'll do more research before I look more into the 850s lol

I agree with you 100%. I'm building a 53 Chevy pickup for drag and drive. It's Running a 1000+HP Chevy I6 292 with a polished Weiand 6-71 NOS and 2 QF 650 DP carbs. 5 stage dry sump and Electromotive TECs 200 EMS. There are few things sexier than a roots blower with duel quads sticking out of the hood. Thank you for your time.

im just redoing all the electronics at once on a 94 ford efi after 30 years. Yeah its a pain, but once it's done its gonna be brand spankin new and last forever

datalogging is incredibly valuable

PUT AN INLINE ELECTRIC FUEL PUMP, SIMPLE!

When the car has been dormant over the winter, I let the engine cranking time (done in several ~5sec bursts, of course) pump the oil around before the engine gets fuel to start. When in regular use (1/week) it starts quickly enough, and that's OK because it has residual oil film.

The green 68 Chevelle has 3 inch exhaust with Borla ProXS mufflers.

I had the same smells with a carb, and I do not have them nearly as bad with EFI. My friend has the same experience. A lot of factors are involved with the smells, but typically EFI is better for that.

@@SS454LS6 The rest maybe cleaned up with installing a cat converter(s). Well thanks for the feed back, it's good to know it's much better anyway!

If you want to eliminate the smell of gas buy an EV. I personally like the smell of gas and burning rubber. Thank you for your time.

Yes, the EFI fuel smell is significantly reduced, especially once I got the tune better. Ive seen similar results in several different EFI setups.

Cool 👍 Enjoying your videos. You have some great roads to drive are you in BC? Oh and a beautiful Chevelle! Enjoyed your friends LS6 rebuild. That thing is a beast.

@@VG-iq8xq Thanks very much. I am in Alberta.

Unlike EFI, carburetors are static, so they do not get "detuned" unless something changes with the engine. And if you were to use the stock style THERMOSTATIC air cleaner (as opposed to an aftermarket open element style), the carburetor will receive a consistent air temperature. This keeps the A/F mixture stable and eliminates the need for seasonal (or environmental) adjustments. Just like with an EFI system, a carburetor needs ALL of the proper components in place to operate at it's best.

@@Tricky2002 That's great, having a thermostatic air cleaner, but many cars 1970-older don't have that.

@@furyfantoo A thermostatic air cleaner can be added to any older carbureted vehicle that didn't have one. (Even the early throttle-body EFI systems used a thermostatic air cleaner.) Just like EFI systems, carbureted vehicles evolved over the years to be more precise and more efficient.

@@Tricky2002 Yes, anything can be done. But most guys wanting to maintain a stock appearance aren't going to add such an air cleaner. Many mid-late Chevy musclecars have open-element air cleaners. And often one would need to change the driver's exh manifold to one accepting a heat stove, and that might dictate exh headpipe to change also. And those thermostatic aircleaners are only operational during engine warmup, when the flap closes the air cleaner performs as a simple snorkeled unit.

@@furyfantoo From about the mid 1960s on, almost all stock vehicles came with some sort of a thermostatic air cleaner. The earlier ones were simpler and worked as you describe. Most from the mid-1970s on would actually modulate the flapper in the snorkel via a simple temperature valve to blend hot air from the exhaust manifold and cool air from outside of the vehicle as needed. This would help maintain a constant air temperature to the carburetor at all times. In turn, this would keep the fuel mixture stable all year round and prevent carburetor icing.

I made a video of how to do timing control for Fitech.

@@SS454LS6 which video is that?

@@guamazolopez6456 kzfaq.info/get/bejne/aMVxdriB1Zu3fGQ.html

LOL If thats your criteria, You go BOY!

@@RipitRon Carbs are simple, fun, sound good.

@@TOMVUTHEPIMP LOL If you say so! I have been building Custom Hotrods and bikes for 35+ yrs and you and anyone else can take your cabs and enjoy...I will take Fuel injection all day every day! He who is stuck in the past remains in the past!

@@RipitRon not actually... a use a mix, old school carb, modern barking, air,suspension, stereo and gauges ... often the simple way is just as satisfying , and as prices increase Carbs are just an easier DIY

@@bradmason8334 you drive that carburetor car across country, thru the mountains and tell me whats better. Not only will I get better fuel mileage, better throttle response, and in most cases more HP than you will, I certainly wont have its spitting and sputtering in elevation or boiling fuel on a HOT 100 degree day. There is a reason FI exists................its simple its better in every way over a metered fuel leak......PERIOD!

Stephen, you don't mount the electronics on the engine nor on the fire wall, inside if you have to, but generally on the inner fender panel, aft of the radiator support with shielded air ducting to the front side of that support ....

@@regdor8187 On a lot of these bolt on EFI units the electronics are inside the injector body and are not removable.

Harry, boy are you delusional......

Cost of tuning applies to carbs as well if you can't do it yourself. It just takes longer because you need to drain the fuel every time you replace the jets, and turning the dizzy requires a wrench too. Same adjustments can be done in seconds with EFI. So it's all relative. As for the supercharger, can't go wrong when it comes to cool factor!

@@SS454LS6 I'm not denying you have a valid point. I guess that's why they call it wrenching. I just don't see any reason to second guess physics. To each their own.

Lazy, chicks don't dig it, they use it as a sign that you have money....

@@regdor8187 And they dig money. So there's the same result. My problem is my taste in women hasn't changed but I keep getting older. I guess now I will go polish my 16 nitrous/fuel lines on my duel quad classic case Weiand 6-71 going on my 1000+HP Chevy I6 292 for my 53 Chevy pickup with a 5 speed. Okay I guess I might be a little old school. All my other cars and trucks have EFI. Sorry so long. Thank you for your time.

@@lazyhoundracing9621 : Your welcome !

So nobody should have a carb because onetime you had one problem? People drove back and fourth across America for decades with carbs and no issues. Sounds like the problem is you and your setup.

@@TOMVUTHEPIMP And let me clarify something, todays fuel does NOT have Anti Boiling agents in fuel. They dont need it since 99.5% of all vehicles licensed are Fuel Injected. This is the reason for my Hatred for a carb...You can have all the sound you want, when your seeing nothing but my tail lights how impressed are you with your Carb?

@@TOMVUTHEPIMP People drove back and forth across America for decades with carbs and had issues all the time. The difference was, that's just how cars were. It was expected and accepted because it was the norm, and there were no alternatives. So people knew how to work on them and deal with it because they had to.

And when your ecu on that crap Holley efi takes a crap on you you better have good shoes or a wrecker on speed dial

@@dannybarlow4256 Well i have 4 of them and the oldest one is now 5 yrs old and not a single issue.....Sorry to burst your bubble but you can say that for any part (INCLUDING) a metered fuel leak box known as a carburetor.

You have to spend a LOT more to get MPFI.

​@@SS454LS6: Starting from No intake system....Not really....In fact, you can get the whole system at your local automotive salvage yard or used car.....

@@regdor8187 Good luck finding an MPFI fuel injection that fits a Mark IV Big block chevy at the salvage yard. Not that I'd even want some plastic truck intake on my engine.

@@SS454LS6 : Use your talents to modify an aluminum intake manifold , weld on and bore for individual injectors....