Quote:
Originally Posted by Pedigo Perf
EFI was implemented by the car makers to make it possible to achieve the emissions requirements imposed by the EPA. Simply put, the required feedback system (oxygen sensor measuring and reporting the mixture) is much more easily controlled by a PCM pulsing an injector than the limited range of a carburetor and the inconsistencies that come with it. Setting a bi-metal spring operated choke for all conditions is virtually impossible, just for one example. A PCM, if programmed properly can easily handle the task of good cold starts and drivability in Denver or that of a 100 degree day in Tulsa.
Power is about airflow and the amount of fuel and oxygen you can combine in the chamber. IMO, a properly tuned carburetor can handle the task just as well as injectors assuming the airflow is not compromised. I have not seen significant gains by replacing a GOOD carb with a throttle body and electronic injection as far as full throttle performance is concerned. Where the injector really has an advantage is that it allows for a wider range of intake manifold design and throttle placement. If you notice the fast small blocks you refer to have a lot of technology in the cylinder heads and intake manifold that compliment the injection system.
Tracy
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The first paragraph of your message Tracy had was true, but just like the evolvement of racing, people were always going to try to make what they had created produce more power, and it's recently proven to be more and more true even since the mid '80's when mass produced FI engines started the good by (to carbs) era. However, your last two sentences of your second paragraph proved my point too. If you're going to change the way fuel goes through the induction system, then all elements of it's transistion to the cylinders should change, not just the initial part. What once was carbs/manifolds/heads, is now FI, manifolds, heads. Just like an engine has to be made stronger to handle nitrous oxide, an engine that's going to produce cleaner emissions (and more power as well), has to have improvements made to all areas to make it work better. Thus what I said about getting more power out of less cubes, due to the enhanced fuel systems we have today.