Which is faster carb or Fuel injection?

B Parker · 07-24-2013, 02:42 PM

Joe Didn't you go a 10:92 in H/SA at Atco this year? How fast do you want to go? I don't see many older Fi cars going 1:23 under. You just have to much time on your hands. Barry

Pistol Pete · 07-24-2013, 03:27 PM

Quote:

Originally Posted by B Parker

Joe Didn't you go a 10:92 in H/SA at Atco this year? How fast do you want to go? I don't see many older Fi cars going 1:23 under. You just have to much time on your hands. Barry

That's tellin 'em Spanky.

Joe DeMarzo · 07-24-2013, 03:40 PM

Brother Parker, you taught me everything I know.... but not everything you know about going fast. Your vette is still sleeping, when are you going to wake that thing up????

I lost something at Lebanon Valley and can't find it, thinking keeps me young.

B Parker · 07-24-2013, 03:55 PM

Joe where have you been hiding. You going to Indy. We are thinking about it. If your not going I may run H. Barry

Bill Grubbs · 07-24-2013, 05:00 PM

Joe, I know what you meant...

Jeff Niceswanger · 07-24-2013, 05:27 PM

This is just our experience, but like has been said in previous post, if everything is apples to apples, their is no noticeable difference. Tuneability and the ability to squeeze out every little hundredth is a big plus for the F.I. The comparison on fuel readings off the Egts are not even close, and we have a pretty well tuned carb. You can get the F.I to somewhat flat line the target fuel curve, and you just are not going to do that with a carb.
We broke in, then dynoed our engine with a carb, and then a box manifold/F.I set-up, and lost 13 horsepower with the F.I. .. The carb was a 750 Q-Jet, but our combo uses the stock 48 mm tuned port (L-98) F.I throttle body, and those little bores suffocate a 350. I am guessing on a 305, the numbers would be closer as not as much air would be needed for good power.

Signman · 07-24-2013, 05:35 PM

With my last engine we did a test to see if there was a big problem with my EFI setup and took off the tune port and put on a 350 manifold, not the best but good and a dyno Q-Jet and picked up 20 HP. Nothing else changed.

Lee Valentine · 07-24-2013, 06:47 PM

Joe, on Bryan's 305 the carbureted combo made 20 more horsepower than the F.I. and made power at a higher rpm. The F.I. combo makes more torque and has a flatter torque curve. run at the same weight the carb is faster.

Ed Wright · 07-24-2013, 07:15 PM

Guys, the carb guys aren't going to believe you by they think there is magic in that ECU. LOL

Btw, that small TB is restrictor. It flows less air that a QJet. My friends with 350"s & carbs often run well past 8500 in the lights, some way past. Dave Layer, when I ordered my heads, told me a 350" would all done by 8200 RPM, of course he was correct. Smart man.

Stock726 · 07-25-2013, 02:56 PM

Quote:

Originally Posted by Lee Valentine

Joe, on Bryan's 305 the carbureted combo made 20 more horsepower than the F.I. and made power at a higher rpm. The F.I. combo makes more torque and has a flatter torque curve. run at the same weight the carb is faster.

Hot Rod mag did a comparison test about a year or so ago using an FI LS1. They swapped on the Edelbrock LS1 4-barrel manifold/carb and made more peak HP in every test. The torque curve was a lot peakier however. Of course the EFI system is infintely more tunable, so there's that... The results really surprised me, I thought the FI would be more efficient by design?

07-24-2013, 02:42 PM	#1
B Parker Senior Member Join Date: Sep 2009 Posts: 849 Likes: 980 Liked 2,336 Times in 464 Posts	Re: Which is faster carb or Fuel injection? Joe Didn't you go a 10:92 in H/SA at Atco this year? How fast do you want to go? I don't see many older Fi cars going 1:23 under. You just have to much time on your hands. Barry

07-24-2013, 03:40 PM	#3
Joe DeMarzo Senior Member Join Date: Oct 2002 Location: Mahopac, NY Posts: 666 Likes: 48 Liked 113 Times in 9 Posts	Re: Which is faster carb or Fuel injection? Brother Parker, you taught me everything I know.... but not everything you know about going fast. Your vette is still sleeping, when are you going to wake that thing up???? I lost something at Lebanon Valley and can't find it, thinking keeps me young. __________________ Joe DeMarzo 1317 STK

07-24-2013, 03:55 PM	#4
B Parker Senior Member Join Date: Sep 2009 Posts: 849 Likes: 980 Liked 2,336 Times in 464 Posts	Re: Which is faster carb or Fuel injection? Joe where have you been hiding. You going to Indy. We are thinking about it. If your not going I may run H. Barry

07-24-2013, 05:00 PM	#5
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 416 Likes: 3 Liked 564 Times in 66 Posts	Re: Which is faster carb or Fuel injection? Joe, I know what you meant...

07-24-2013, 05:27 PM	#6
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 894 Likes: 686 Liked 1,034 Times in 368 Posts	Re: Which is faster carb or Fuel injection? This is just our experience, but like has been said in previous post, if everything is apples to apples, their is no noticeable difference. Tuneability and the ability to squeeze out every little hundredth is a big plus for the F.I. The comparison on fuel readings off the Egts are not even close, and we have a pretty well tuned carb. You can get the F.I to somewhat flat line the target fuel curve, and you just are not going to do that with a carb. We broke in, then dynoed our engine with a carb, and then a box manifold/F.I set-up, and lost 13 horsepower with the F.I. .. The carb was a 750 Q-Jet, but our combo uses the stock 48 mm tuned port (L-98) F.I throttle body, and those little bores suffocate a 350. I am guessing on a 305, the numbers would be closer as not as much air would be needed for good power. __________________ Jeff Niceswanger 3740 SS Last edited by Jeff Niceswanger; 07-24-2013 at 05:36 PM.

07-24-2013, 05:35 PM	#7
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? With my last engine we did a test to see if there was a big problem with my EFI setup and took off the tune port and put on a 350 manifold, not the best but good and a dyno Q-Jet and picked up 20 HP. Nothing else changed. __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"

07-24-2013, 06:47 PM	#8
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, on Bryan's 305 the carbureted combo made 20 more horsepower than the F.I. and made power at a higher rpm. The F.I. combo makes more torque and has a flatter torque curve. run at the same weight the carb is faster. __________________ Lee Valentine 1661 STK

07-24-2013, 07:15 PM	#9
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Which is faster carb or Fuel injection? Guys, the carb guys aren't going to believe you by they think there is magic in that ECU. LOL Btw, that small TB is restrictor. It flows less air that a QJet. My friends with 350"s & carbs often run well past 8500 in the lights, some way past. Dave Layer, when I ordered my heads, told me a 350" would all done by 8200 RPM, of course he was correct. Smart man. __________________ Ed Wright 4156 SS/JA Last edited by Ed Wright; 07-24-2013 at 07:18 PM.