Which is faster carb or Fuel injection?

Joe DeMarzo · 07-24-2013, 09:45 PM

Barry rumor has it that neither of us is the fastest H/SA in D-1 let alone at Indy. I am going to take a pass been a rough year. My ego can't take losing hahahaha. My money is on you if you go in H/SA. That is why I am looking for a soft EFI combo.

Tony Curcio · 07-24-2013, 11:05 PM

I'm gonna take a stab at this. The Third Gen Camaros mentioned above have a manifold with relatively long runners, which will make more power down low, and perhaps explains why you observed a harder launch.
Q-Jet manifold that I assume Frank and Lee refer to have much shorter runners, and should make peak power at a higher RPM, which probably accounts for the higher peak HP observed.
If the comparison was made with identical manifolds and the same total area throttle body/throttle blades, and fuel curves both optimized to whatever extent possible, I'll argue that the FI has superior atomization, and should make a little more power at every increment.

Signman · 07-25-2013, 09:23 AM

[QUOTE=
If the comparison was made with identical manifolds and the same total area throttle body/throttle blades, and fuel curves both optimized to whatever extent possible, I'll argue that the FI has superior atomization, and should make a little more power at every increment.[/QUOTE]

Let's take an look at a ringer in the Mopar DragPak engine with the tall single plane and throttle body on top. Easily replaced with a carb. If the throttle body was flowed, a really good Holley was assembled to match, have a feeling that there would be little to nothing.

Don't think there is any way to compare EFI to Carb in a stocker apples to apples. If you look at the potential of the combination with it's HP rating then you have something to study. Not being a dedicated student it appears to be a new car or a slow car.

Michael Beard · 07-25-2013, 12:27 PM

Quote:

Let's take an look at a ringer in the Mopar DragPak engine with the tall single plane and throttle body on top. Easily replaced with a carb. If the throttle body was flowed, a really good Holley was assembled to match, have a feeling that there would be little to nothing.

Don't think there is any way to compare EFI to Carb in a stocker apples to apples.

Correct. My 5.9L DragPak uses the identical M1 single plane manifold that my 360 Magnum crate motor (w/ 750 Holley) had. They come with the bosses to be drilled for injectors. That being said, simply swapping carb vs EFI, even adjusting jetting/tuneups, is not as apples to apples as one would think. There are other variables involved in optimization for each.

Lee Valentine · 07-25-2013, 01:12 PM

Joe if you find a soft EFI combo call me!

Signman · 07-25-2013, 09:14 AM

[QUOTE= That is why I am looking for a soft EFI combo.[/QUOTE]

Get a new Camaro or Mustang.
Or call Billy.

07-24-2013, 09:45 PM	#1
Joe DeMarzo Senior Member Join Date: Oct 2002 Location: Mahopac, NY Posts: 668 Likes: 49 Liked 121 Times in 11 Posts	Re: Which is faster carb or Fuel injection? Barry rumor has it that neither of us is the fastest H/SA in D-1 let alone at Indy. I am going to take a pass been a rough year. My ego can't take losing hahahaha. My money is on you if you go in H/SA. That is why I am looking for a soft EFI combo. __________________ Joe DeMarzo 1317 STK

07-24-2013, 11:05 PM	#2
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	Re: Which is faster carb or Fuel injection? I'm gonna take a stab at this. The Third Gen Camaros mentioned above have a manifold with relatively long runners, which will make more power down low, and perhaps explains why you observed a harder launch. Q-Jet manifold that I assume Frank and Lee refer to have much shorter runners, and should make peak power at a higher RPM, which probably accounts for the higher peak HP observed. If the comparison was made with identical manifolds and the same total area throttle body/throttle blades, and fuel curves both optimized to whatever extent possible, I'll argue that the FI has superior atomization, and should make a little more power at every increment. __________________ Tony Curcio 1860 STK

07-25-2013, 09:23 AM	#3
Signman Senior Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 535 Likes: 22 Liked 269 Times in 99 Posts	Re: Which is faster carb or Fuel injection? [QUOTE= If the comparison was made with identical manifolds and the same total area throttle body/throttle blades, and fuel curves both optimized to whatever extent possible, I'll argue that the FI has superior atomization, and should make a little more power at every increment.[/QUOTE] Let's take an look at a ringer in the Mopar DragPak engine with the tall single plane and throttle body on top. Easily replaced with a carb. If the throttle body was flowed, a really good Holley was assembled to match, have a feeling that there would be little to nothing. Don't think there is any way to compare EFI to Carb in a stocker apples to apples. If you look at the potential of the combination with it's HP rating then you have something to study. Not being a dedicated student it appears to be a new car or a slow car. __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"

07-25-2013, 01:12 PM	#5
Lee Valentine Senior Member Join Date: May 2004 Location: Brookfield, CT Posts: 708 Likes: 13 Liked 319 Times in 68 Posts	Re: Which is faster carb or Fuel injection? Joe if you find a soft EFI combo call me! __________________ Lee Valentine 1661 STK

07-25-2013, 09:14 AM	#6
Signman Senior Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 535 Likes: 22 Liked 269 Times in 99 Posts	Re: Which is faster carb or Fuel injection? [QUOTE= That is why I am looking for a soft EFI combo.[/QUOTE] Get a new Camaro or Mustang. Or call Billy. __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"