Which is faster carb or Fuel injection?

Lee Valentine · 07-31-2013, 07:21 PM

Check again Frank , 305-175 flattop-big cam carb and 305-215 TPI use all the same #'s and cc's . same cam ,416 head etc.

Adger Smith · 07-31-2013, 08:07 PM

14081005,004
10066015

I could have Memory failure, but seems like one or all three of those '85 FI intakes are not so good.

Signman · 08-01-2013, 09:34 AM

Quote:

Originally Posted by Lee Valentine

Check again Frank , 305-175 flattop-big cam carb and 305-215 TPI use all the same #'s and cc's . same cam ,416 head etc.

Lee, I stand corrected.
Both engines are the same but for the top.

buzzinhalfdozen · 08-02-2013, 02:24 PM

I've seen batch fire and sequential mentioned how bout timed injection? Having the ability to dictate when the injector pulses would seem to be of benefit. Not sure how many systems offer this or how much time has been spent testing it.Spraying fuel into an active air column would seem at least in theory to have some potential gains.

Ed Wright · 08-02-2013, 02:51 PM

Quote:

Originally Posted by buzzinhalfdozen

I've seen batch fire and sequential mentioned how bout timed injection? Having the ability to dictate when the injector pulses would seem to be of benefit. Not sure how many systems offer this or how much time has been spent testing it.Spraying fuel into an active air column would seem at least in theory to have some potential gains.

Joe, you can time the injector pulse in the FAST XFI, and likely the other race systems as well.

buzzinhalfdozen · 08-02-2013, 04:39 PM

Yes Ed, wasn't sure about others, my ECU-882 has that ability however I've yet to do any serious testing using it. Would be interesting to hear from someone that has. At higher engine speeds I'm imagining a serious amount of feul vapor being flying around in my manifold....is it a detriment or a help...I'm not sure.I've even wondered if my manifold design since it was made for a carb is a hinderence guess time will tell. BTW my car has ran as fast if not slightly faster with the EFI versus the carb, though again it may be contributed to the manifold and head design more than the actual delivery system....sure can't beat the EFI throttle response though.

Adger Smith · 08-03-2013, 12:41 AM

Joe,
The V-6 engines you and I run might be the type engine that really benefits from EFI. As you know they are subject to some real weird pulses in the manifold. As you stated fuel in the intake a real problem. EFI could be a help. I have played with 5 different intake configurations to get the best. The best still has some crutches in to help the carb with mixture distribution. I think EFI would help because of the dry flow.

07-31-2013, 07:21 PM	#1
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? Check again Frank , 305-175 flattop-big cam carb and 305-215 TPI use all the same #'s and cc's . same cam ,416 head etc. __________________ Lee Valentine 1661 STK

07-31-2013, 08:07 PM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Which is faster carb or Fuel injection? 14081005,004 10066015 I could have Memory failure, but seems like one or all three of those '85 FI intakes are not so good. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 07-31-2013 at 08:08 PM. Reason: sp

08-02-2013, 02:24 PM	#4
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: Which is faster carb or Fuel injection? I've seen batch fire and sequential mentioned how bout timed injection? Having the ability to dictate when the injector pulses would seem to be of benefit. Not sure how many systems offer this or how much time has been spent testing it.Spraying fuel into an active air column would seem at least in theory to have some potential gains. __________________ Joe Buchanan SS/BX 3117

08-02-2013, 04:39 PM	#6
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: Which is faster carb or Fuel injection? Yes Ed, wasn't sure about others, my ECU-882 has that ability however I've yet to do any serious testing using it. Would be interesting to hear from someone that has. At higher engine speeds I'm imagining a serious amount of feul vapor being flying around in my manifold....is it a detriment or a help...I'm not sure.I've even wondered if my manifold design since it was made for a carb is a hinderence guess time will tell. BTW my car has ran as fast if not slightly faster with the EFI versus the carb, though again it may be contributed to the manifold and head design more than the actual delivery system....sure can't beat the EFI throttle response though. __________________ Joe Buchanan SS/BX 3117

08-03-2013, 12:41 AM	#7
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Which is faster carb or Fuel injection? Joe, The V-6 engines you and I run might be the type engine that really benefits from EFI. As you know they are subject to some real weird pulses in the manifold. As you stated fuel in the intake a real problem. EFI could be a help. I have played with 5 different intake configurations to get the best. The best still has some crutches in to help the carb with mixture distribution. I think EFI would help because of the dry flow. __________________ Adger Smith (Former SS)

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