EFI
#1740286
01/27/15 04:33 PM
01/27/15 04:33 PM
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Joined: Mar 2005
Posts: 1,559 Michigan
Kiddart
OP
pro stock
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OP
pro stock
Joined: Mar 2005
Posts: 1,559
Michigan
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I am sure this will open a big discussion and that's good. my main point I would like answered is
will efi make my care faster and more consistent?
I understand that chassis has a lot to do with it as well but my car has always had the same 60 foot numbers more less from time to time. it doesn't swing very much.
so what will efi do for me??
thanks as always
Thank you Kiddart
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Re: EFI
[Re: Kiddart]
#1740288
01/27/15 05:13 PM
01/27/15 05:13 PM
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Joined: May 2003
Posts: 6,570 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,570
Downtown Roebuck Ont
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Quote:
I am sure this will open a big discussion and that's good. my main point I would like answered is
will efi make my care faster and more consistent?
I understand that chassis has a lot to do with it as well but my car has always had the same 60 foot numbers more less from time to time. it doesn't swing very much.
so what will efi do for me??
thanks as always
It should start and idle instantly.
Will it be faster? Maybe. Probably not much unless your carb is completely off the reservation.
Consistent? It should be if for no other reason than it will correct itself for weather. This assumes that you get the fuel and timing map dialed in.
Kevin
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Re: EFI
[Re: Jerry]
#1740291
01/27/15 05:44 PM
01/27/15 05:44 PM
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Joined: Jul 2008
Posts: 361 Canada
onig
enthusiast
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enthusiast
Joined: Jul 2008
Posts: 361
Canada
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Easier and quicker to tune once you understand EFI. It will also do a heck of a lot more than controlling your engine.
69 Dart
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Re: EFI
[Re: Kiddart]
#1740295
01/27/15 08:46 PM
01/27/15 08:46 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I just started running EFI.. but I MIGHT have to make a fuel table just for racing... in open loop its trying to drive the A/F to stoichiometric all the time and in a max power condition you want somewhere in the 12.5 range... so just for racing I might have to with a fuel table... it can be way more consistent if you stay in open loop and let the O2 do the work.. I'll tell you come spring time which way I go on the loop thing
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Re: EFI
[Re: MR_P_BODY]
#1740296
01/27/15 08:55 PM
01/27/15 08:55 PM
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Joined: Mar 2005
Posts: 1,559 Michigan
Kiddart
OP
pro stock
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OP
pro stock
Joined: Mar 2005
Posts: 1,559
Michigan
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well I hope to be at the track the same time. hopefully I can pull the trigger on the system and we can learn it together
Thank you Kiddart
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Re: EFI
[Re: Kiddart]
#1740297
01/27/15 09:00 PM
01/27/15 09:00 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
well I hope to be at the track the same time. hopefully I can pull the trigger on the system and we can learn it together
That would be great... I'm gonna start out with the O2 running the show then build a fuel table and see which is faster
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Re: EFI
[Re: MR_P_BODY]
#1740298
01/27/15 09:20 PM
01/27/15 09:20 PM
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Joined: Jan 2003
Posts: 965 Odessa, Fl
blowndart
super stock
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super stock
Joined: Jan 2003
Posts: 965
Odessa, Fl
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Quote:
I just started running EFI.. but I MIGHT have to make a fuel table just for racing... in open loop its trying to drive the A/F to stoichiometric all the time and in a max power condition you want somewhere in the 12.5 range... so just for racing I might have to with a fuel table... it can be way more consistent if you stay in open loop and let the O2 do the work.. I'll tell you come spring time which way I go on the loop thing
It's closed loop that has the O2 sensor making corrections, not open loop. You could richen up your base fuel map to run richer like you want while racing and change to open loop when at the track so there is no O2 correction. Then you can tunr the Cloosed loop back on for driving around on the street. Or if you want, change the closed loop map to whatever AFR you want and have it run a richer mix during racing. I assume you EFI has a wide band O2 sensor? If not you won't be able to program for richer than stoic AFRs and you will have to do the first option.
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Re: EFI
[Re: blowndart]
#1740299
01/27/15 10:04 PM
01/27/15 10:04 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
super stock
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super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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Monte Smith and Edward Miller have made me decide to go EFI also on my R/T. Plan to start to the switch in March and have decided on the Holley Dominator EFI.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: EFI
[Re: MR_P_BODY]
#1740300
01/27/15 10:09 PM
01/27/15 10:09 PM
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Joined: Jan 2003
Posts: 1,938 Sonora CA
Mopar_Rich
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,938
Sonora CA
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Quote:
I just started running EFI.. but I MIGHT have to make a fuel table just for racing... in open loop its trying to drive the A/F to stoichiometric all the time and in a max power condition you want somewhere in the 12.5 range... so just for racing I might have to with a fuel table... it can be way more consistent if you stay in open loop and let the O2 do the work.. I'll tell you come spring time which way I go on the loop thing
You definitely want to stay in closed loop with a target A/F ratio in the mid 12s, but you also want a base fuel table that doesn't require that closed loop does all the work. You want the base fuel table to be close to ideal. This is because the closed loop correction is always "behind the curve" because it only sees what has already happened. You don't want to run a race engine lean at any time.
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Re: EFI
[Re: Mopar_Rich]
#1740301
01/27/15 10:53 PM
01/27/15 10:53 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
I just started running EFI.. but I MIGHT have to make a fuel table just for racing... in open loop its trying to drive the A/F to stoichiometric all the time and in a max power condition you want somewhere in the 12.5 range... so just for racing I might have to with a fuel table... it can be way more consistent if you stay in open loop and let the O2 do the work.. I'll tell you come spring time which way I go on the loop thing
You definitely want to stay in closed loop with a target A/F ratio in the mid 12s, but you also want a base fuel table that doesn't require that closed loop does all the work. You want the base fuel table to be close to ideal. This is because the closed loop correction is always "behind the curve" because it only sees what has already happened. You don't want to run a race engine lean at any time.
Thanks... sorta what I figured... do I have the loop correct in that the O2 is working in open loop (I can never remember that)
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Re: EFI
[Re: Mopar_Rich]
#1740303
01/27/15 11:23 PM
01/27/15 11:23 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
No. The O2 sensor is used in closed loop and computes corrections to the base fuel table.
Thanks... I dont know why I can never remember the loop and I worked with injection for over 20 years.. but I did the mechanical part.. nothing on the electrical part
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Re: EFI
[Re: FastmOp]
#1740305
01/28/15 12:47 AM
01/28/15 12:47 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I'm pretty sure that in closed loop the ECU is trying to correct to the Air/Fuel ratio table not the fuel map. If you have the correction set at 20% it will correct a lot more then at 5% You use the wide band to dial in your base map. With the higher percentage. Then as you fine tune the fuel map by reading logs and overlaying them on the fuel table and adjusting the cells up or down. You back the percentage down so if the wide band goes out you don't burn up the motor.
For right now its in self learn mode..I just fired it up before I left on vacation... its gonna be in self learn mode when I get it out in the spring... I'll be reading up on it till I have a better handle on it.... as of now Monte just said keep it in the self learn mode
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