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Originally Posted by x ReAcT x
Making it more efficient im assuming? In your opinion do you think its comparable to EFI in the LS engines?
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Dude, you are wearing us out lately.
Just razzing you! We’re always glad to help educate newbies.
TBI – Throttle Body Injection (1987 – 1995 5.7 through 7.4L) ….similar to a carburetor where fuel delivery is squirted in the mouth of the intake manifold but TBI is much more reliable and precise fuel control over any carburetor. TBI is much better than carburetors!
MPFI (SFI) – (1996 to current 5.7L through 8.1L) Multi-Port Fuel Injection but in the GM world, they called it Sequential Fuel Injection where each injector is fired individually in the engine firing order. Much better than TBI!
Direct Injection – (coming in 2014 5.?L through 7.?L. GM is already using DI on 3.6L V6 engines) The fuel injectors are mounted in the cylinder head beneath the intake ports and spray fuel directly into the combustion chamber fired individually in the engine firing order, just like a modern diesel engine. Much better than MPFI!! Direct Injection is a huge jump in technology and performance almost like going from 1986 carburation days to the 1987 TBI days. DI is a major milestone in GM gasoline engine history and will be the next big thing for engine swappers in the years to come. The performance cannot be matched by any previous fuel injected engine. DI is the shizzle...you'all just wait and see!
An LS engine is what you could consider port fuel injection, but in GM Powertrain lingo it would actually be SFI and yes it is more efficient and produces much more performance. It kills me to see people take a LS engine and spend a pile of money on a controller and harness to run the distributorless ignition only to throw a toilet carburetor on top. I don’t get that. For a tiny bit more they could have fuel injection and a heck of a lot more performance and durability.