Well CarCraft Does it Again........

[TC]

I'm sure this is going to ruffle a few feathers.... On page 30 of the new CarCraft they do a Carburetor vs. EFI dyno test on a 468ci LS motor...... The EFI setup had a 102mm TB, 50lb injectors, A1000 fuel pump, and a Holley Dominator EFI Controller and the carb setup was using two 750HP Holley carbs...

CarCrafts Results = The carbs made more peak HP and made more power throughout most of the power curve......

So is EFI really all that it's cracked up to be?? In this dyno comparison not so much.......

And they credit the majority of the Power gains that the carb had do to the intake cooling effect that is offered by Carburetion......

[Barry Donovan]

two 750.

that needs some big dynamics in ignition. A place I found that like a micro controller.What did they use?

Not to be dumb. There was a tug of war with this EFI carb evolution. I had piles of overlapping stuff for one car.

[anotheridiot]

I dont think the only gains from going EFI have to do with peak horsepower, as far as street guys go, which is what car craft caters to. You are talking overall fuel efficiency, as well as more power range on the street. Ever drive bumper to bumper with a mechanical secondary carb? Yeah, she goes when you floor it, but pretty pissy when you are feeding your car with a 2 barrel.

[TC]

Oh and I guess I left out some major info, the EFI setup made a peak of 713hp, where the carbs made 724hp.... And the EFI made peak torque of 614ft-lbs where the carb made 631ft-lbs..... In fact the Carb bested the EFI by 5-10 HP and 10-20ft-lbs throughout the whole rpm range...........

[TC]

two 750.

that needs some big dynamics in ignition. A place I found that like a micro controller.What did they use?

They used the Holley EFI controller on both tests to control the timing......

[Scott Liggett]

They used the Holley EFI controller on both tests to control the timing......

Their controller sucks. See anyone at the track using it?

[Thumpin455]

Ya know, I build carbs, pretty good at it. I can still see the advantages of EFI vs carbs, and of course what carbs do better. If all you are looking for is max power, then sure just use the simplest and cheapest thing you can. I bet a Flying Toilet would do pretty well vs carbs and EFI too.

If you want to actually drive the thing around on the street, the way EFI controls the fuel makes for damn nice drivability. If I am just going down the strip and back up the return road, I have no real need for EFI, that is like using a 747 to move across town. It will do so much more than what you are asking it to do. Asking a carb, even my darling Qjet to make max power and deliver great drivability with mileage in the mid 20s is going to be a asking a lot of the carb and you netter know how to tune the thing.

I am not afraid of EFI, carbs arent going anywhere soon, but I wont ask one to do something the other does better. I want to trade my 1050/Victor for an EFI system so I can drive the 700hp 467 on the street. I dont think it will make many legal 1/4 mile passes, but I really want to enjoy the beast I built. Driving with the Dominator and that big solid roller sucks, plain and simple. EFI would make it so much less of a pain in the ass to cruise, and I could easily switch between pump gas and home brew.

So a pair of carbs made more power. Nice. You wont be sneaking up on anyone with them, which is ok if you want that sort of thing.

[bishir]

They should race both engines up Pikes peak.

[ls7gto]

Wow, sounds like TC is trying to start a fight again. put down the magazine and finish a car.

[CDMBill]

I just read the article today and my first thought was if the manifold is well developed for the carbs then they left power on the table in EFI mode. The optimal configuration for each is different. The cooling effect of fuel atomization is real which is why most all out drag race EFI set-ups have the injectors up high on the runner.

Secondly, I'd like to see dual four barrel throttle bodies on the dual quad plate. There is a reason Jeff, Doc and yes me too, have gone to dual four barrel TB's on a tunnel ram for our DW N/A motors. The single big TB's with those wedge tops solve packaging problems but aren't best for WOT power. If they were you'd see them on IHRA super pro stock motors, but you don't.

It's an interesting article but I don't think it adds much to the conversation as the "let's swap tops on the same carb optimized manifold" sets up a false choice.

[skullbucket]

Seriously, with the fuel injection kits coming out and when the prices go down, I hate to say it but I can't see a reason to ever run a carb again.
I definitely would change over the vette for the kit, safe fuel supply, instant starting and idling, tuning ability.
It gives you more time to polish your chrome valve covers.

[TC]

Seriously, with the fuel injection kits coming out and when the prices go down, I hate to say it but I can't see a reason to ever run a carb again.
I definitely would change over the vette for the kit, safe fuel supply, instant starting and idling, tuning ability.
It gives you more time to polish your chrome valve covers.

Sometimes I wonder if people actually drive cars with carbs........... That monte I just picked up drove just fine..........

[skullbucket]

Sometimes I wonder if people actually drive cars with carbs........... That monte I just picked up drove just fine..........

Its so nice to reach in the window and turn the key and the engine starts in the morning and if you want you can just take off without chugging and bog.

[TC]

Its so nice to reach in the window and turn the key and the engine starts in the morning and if you want you can just take off without chugging and bog.

Every carbed motor I've ever had did the same thing.........I actually used to brag about, just reached through the window hit the key and it started right up.......But then I like Holley's..........

[Ron Ward]

Alex, have you ever started a car in -20 degree weather?