Carb of EFI
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91nbtsi wrote:
Eh, can't see why fuel droplets out of a jet provide better atomization than a nice mist of fuel?They don't. Most carb equiped vehicles still have a problem with fuel "puddling" which isn't nearly as much of a problem in modern FI engines and is almost non-existent in GDI engines that are becoming more previlant nowadays.
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And I wont even start to get into trying to evenly distribute the fuel from up to 4 sources (most carbs) into a standard V8 intake manifold (8 seperate runners). That's typically why a FI engine at the same hp range as i carbed engine nets the same power at less fuel demand. Efficiency rules. The only advantage (in my eyes) to running a carb is initial cost. That is very limited as well. As I see it, in "most" situations on a modern performance vehicle..... Carbing a vehicle is just plain lazy.
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I'll admit they do have very impressive hp #'s. (some of the highest out of a gasoline engine) But I'm pretty sure that if fuel injection was made legal to run on top fuel and funny cars, that would happen. It probably would take little bit to perfect but, I know that it would ultimately prove to be the MORE EFFICIENT form of fueling a car.
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I swear I remember reading an article from a prominant motor builder/tuner that stated under heavy load a carb actually atomizes the fuel better than an EFI. However at low throttle the carb loses hands down to the EFI system.
And aren't top fuel cars more of a direct injection style system? W/ pneumatics and timers controlling fuel delivery?
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I'm not trying to promote carbs. I don't run them on my bike(completely different than a car though), but the main thing is you need to be realistic when it comes to what you want/can spend.
Dave and Matt run very quick times on EFI, but neither of their setups are what I would consider cheap.(Taking into consideration the "retail" value of their work. Just because Matt tinned his whole car, doesn't mean that everyone may have that ability. To me, that work has value.)
On the other hand, look at Christian's old Capri, that car had very little into in $$-wise, and went 11.3. It was also a 5-speed car that he could(and did) drive EVERYWHERE. Put a C4 in that car and it would have run 10s no problem.
I would talk to Christian and Andy(Dynotune). I would bet you'll be able to get an earfull from both of them on both sides of the subject.
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DaveH wrote:
Good grief you guys... Top fuelers don't have carbs, they are mechanically fuel injected. Basically they are EFI without the E.YA!! So THERE!!!! Put that in ur pipe and smoke it.
So really, I wasn't sure about that so I assumed they were carbed cuz Ethan posted it as such. Shame on me for not being better versed in top fuel cars and also for believing him.:o
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Didn't I say that?
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I suppose each application would have a different outcome, but on sprint cars (something I know from experience) just going from an alcohol carb to a hilborn injection (mechanical) is right around a 75 horse increase at upper rpm(6500-9000) but at lower rpm around 3000 (which besides idling and warm up sprint cars never run at) they are close in hp, a slight edge for the injection
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