Carb vs Fuel Injection Options

[d3ath2009]

Has there been any work done with a 7afe, 5sfe, or 3sge where everything has been swapped out so an old school carb could work on it? with a carb, would you b able to ditch a lot of the electronics that restrict these motors and basically crank out power however you wanted to?

[Johnnyny]

no!

[jcbass7]

this would require a lot of custom work to change the whole setup like that. The fuel system, the intake, possibly the distributor.. the list goes on. These engine were engineered to be fuel injected.

Its way more work than it would ever be worth. I prefer fuel injected to carbs anyday.

This post has been edited by jcbass7: Oct 31, 2010 - 9:20 PM

[Bitter]

LOL yea, a modern ECM really restricts power output..thats why people convert their old carb'd engines to EFI to make more power.

[d3ath2009]

im just sayin, my friend pulled out the stock motor from his 03 mustang and dropped in a carb motor.... he put in a 302 and was pushin more power than any fuel injected 302 could ever dream of w/o forced induction... he now got over 500 hp with a 347 stroker.... no i know the motors in these celicas are not even half that size, but couldnt the same principle apply?
*im not considering this, just curious to kno more about the idea

[Bitter]

he could have made that much or more on a PROGRAMMABLE standalone ECU and whatever sized injectors and throttle body. having precise control over air/fuel ratio's and timing curves is way better than the 'ballpark' which you get from carbs and vacuum advance.

[Hanyo]

im just sayin, my friend pulled out the stock motor from his 03 mustang and dropped in a carb motor.... he put in a 302 and was pushin more power than any fuel injected 302 could ever dream of w/o forced induction... he now got over 500 hp with a 347 stroker.... no i know the motors in these celicas are not even half that size, but couldnt the same principle apply?
*im not considering this, just curious to kno more about the idea

The main reason people swap carb motors into modern cars is because of simplicity. You will not have to monkey around with sensors and wiring. Also turning a carb engine only requires adjusting a hand full of screws.

A fuel injected engine is very difficult to tune correctly from scratch. You have to adjust ignition timing, fuel ratio, air temperature, and engine load at every RPM range. Most people don't have the skills and equipment to do that. Therefore swapping in a carb engine would be the best for your average joe because of more after market support and simplicity.

If you want to compare some numbers, we have many good examples.

One example is the 4A series engines which was made popular in the Ae86 corolla. It started life with a carb and later in production was converted over to fuel injection.

The 4af (carb) engine puts out around 94 hp; where as the 4afe (fuel injection) makes 105 hp. However the power increase is not the only reason why fuel injection is the superior method of fuel delivery.

Fuel injection offers better: fuel economy, fuel control, engine response, and lastly more power. It allows the engine to start in the cold better because there is no choke. A fuel injected car will never vapor lock or flood the engine. A fuel injected car will not continuously change the way its tuned as the air and fuel filters age.

A fuel injected car allows for a better engine design because the are no butterfly valves or jets placed in the path of air flow.

Before we all start hating carburetors, we have to remember NASCARS still use carbs and can make 750+ hp for long durations of speeds 200+mph.

[blu94gt]

I don't understand why you'd want to DD a carb'd car over a fuel injected one? I love simplicity, but there's a point where turning the key and it starting without having to dick with mixture and whatnot is nice.

I can't wait to get a fuel injected motorcycle. I love my old Yamaha because it's so simple, the only electronics on it are for the coils, lights and starter, makes it look very clean. Take my buddy's Buell on the other hand: it's fuel injected, with almost double the motor I have, more than double the power, and gets 60-70 mpg compared to my 40-50. And starts every time without messing with the prime, choke, etc.

So yes, fuel injection > carb'd any day.