A while ago I considered making a thread about fuel injection vs carburetor, which is better?
What started me thinking about this was a video showing a Comaro Sports Sedan breaking teh Sports Sedan lap record at Bathurst during one of the "combined sedans" support race at the Bathrust 12h, 2018.
I thought the car sounded a lot like a NASCAR, so I looked up the rules and found that the NASCAR engines are, indeed permitted. By the shape of the engine cover this one looks to be a carburetted version, the car having being built around 2012.
In contrast, some of the other NASCAR powered Sports Sedans are fitted with multi-port fuel injection with individual throttle bodies. Such as John Gourlay's Audi/Chev Sports Sedan, driven by Jack Perkins.
So I looked around for direct comparison videos, where an engine has been dynoed with both.
This one shows small gains changing from carbs to EFI, the intake system being from a big bike can support more power.
While this one shows a small loss
Obviously the question is always "which one makes more power?". But isn't that question like "how long is a piece of string?".
If you put an EFI system that flows less air than the carburetor it replaces, it is most likely to make less power. And if it flows more, then more power can potentially be made. Assuming the fuel injectors are big enough to support that power.
The second video is a FiTech TBI system. The base model of that is rated for 400hp, so could the loss of power be explained by it being at the upper limit of its air and fuel flow capabilities?
Would it be fair to say that the advantages an EFI system has over carburetors are not the peak power side, but more on the low/mid range area of the power curve and fuel economy?
And finally, has the carb vs EFI question been settled? Obviously almost all petrol cars sold today have EFI, but many of those have been converted to carb for racing, and there are still a lot of carburetor proponents.