Project

Very unsatisfied with the results there Winter 04 mag gave. Project "Danger Mouse"

Supercharged Carb: Max TQ 430 Max HP 474 AVG: TQ 397 HP 330

Supercharged FAST EFI (30lb injectors) MAX TQ 431 Max HP 480
AVG TQ 400 HP 332

Those results are all within the margin of error for dyno. I'm pissed after spending countless hours with my DFI and laptop tuning my *** off and learning, I could have bolted on a holly 750cfm blower carb and got the same results

anesthes

iTrader: (12)

If the ultimate peak HP or torque is what makes the difference for you, then you need to keep reading.

-- Joe

Rembrandt

but is this on the same engine though?

If the engines are exactly the same except one has a four barrel throttle body and injector bungs drilled into the intake, that isn't too significant a difference.

EFI really helps with adaptability of the fuel system. you don't need jet changes at different elevations, barometric pressures, humidities and temperatures.

a lot of extreme high performance engines turbo/super and NA end up using injectors far away from the intake valves, upstream to allow more time and distance for more complete fuel mixing, like a carb. Since many sequential injection systems end up reverting to bank-to-bank or batch fire once the RPMs get too fast, the amount of time fuel dwells in ports with a closed valve gets really small, to where the difference between a carb and EFI is not significant.

you don't lose much power with a carb.

Rembrandt

Anyone have a link to the article? I haven't read it.

Project

it is the exact same motor, with an aftermarket EFI system....over the entire powerband there is NOTHING over 5hp 3lb tq. difference.....all the pros of fuel injection mean nothing to me now since it doesn't make any difference. Ohwell I guess i'll always be a carb man

anesthes

iTrader: (12)

So, one magazine article, and your personal lack of understanding EFI and suddenly its all not worth it?

eh whatever.

-- Joe

Project

No, I got into fuel injection because it was "More reliable" "More efficent" "More power"

And it is a nightmare, I have had more problems with my DFI unit than I can count and a carb makes just as much power with 1950's technology

Doward

If WOT is your only thing, then yes - stay carb'd.

If smooth idle, infinite tuneability over ALL RANGES OF THROTTLE/LOAD are your thing, then go EFI.

It's not WOT that EFI shines.
It's part throttle.

Project

EFI is a useless pain the *** designed to confuse old rodders and intimidate them into taking their vehicles to a ford mechanic that charges $75 an hour

Mike-91 Formula 350

Except on cold mornings.

anesthes

iTrader: (12)

Thats because you don't know what your doing. In your case, the carb is the correct choice.

EFI is not for everyone.

-- Joe

CrazyHawaiian

The way I see it, carb and EFI both achieve the same goal. The right one for you depends on what you want and what you know how to work with. I dont really consider one better than the other, just different methods of achieving the same results.

fb305svs

my car starts up fine in 3* weather witha carb...

91GTABird

put both motors through the no2 test. Make 500hp and pass emissions.

B4Ctom1

I would bet the carbed blower engine would have issues with drivability, even if the only issue is not being abole to pass a gas station.

I guess if you want cheap, we have said for years on this board, want a blower? throw a 177 and a carb on it. Don't waste your money with EFI and turbos and centrifugals.

Only one problem, worrying if you can make it back to town from "the spot" or trying to drive it to the track. Better carry some gas cans. If this doesn't bother you then by all means go with the roots and carb.

Atleast you would understand that you will be stopping alot more often to refill. maybe more than twice as often.

Grumpy

Build something that really gets the fuel sloushing in the float bowls and get back to me. All you can do in that case is bandaid the system to sorta work.

Try getting a carb really right, and when you get done with the emulsion tubes in a couple years, you'll understand what a PITB carbs are.

For lots of people close is fine, and they just don't feel the difference from Carbs to EFI. For them there's no telling them the difference.

Not to mention you just can't get a distributor curved the way you can with EFI.

If your talking about a GenVI, well, that's one of the earliest, systems ever done. It's in some respects not much better then a carb.. The newer stuff or oem type can even offer *pump shoot* tunable to different RPM ranges, and temps, and you simply can't do that with a carb..

I've spend decades working on carbs, and I'm glad to have made the transition to EFI.