Re: FI Tech VS Tuned Carb
[Re: ccdave]
#2425195
12/29/17 01:03 AM
12/29/17 01:03 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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I did back to back quick fuel vs. FAST TBI self learning years ago...It actually took me a while to get the FAST system to the same ET as the carb. Got to pick the right WOT AFR and get the squirter shot right.
When I was done, they were within .03 of each other. .03 does not seem like a lot when you consider the extra dollars and parts required for EFI. But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top
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Re: FI Tech VS Tuned Carb
[Re: MR_P_BODY]
#2425198
12/29/17 01:10 AM
12/29/17 01:10 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top On a carb, there is no wiring to change. And whatever happened to the guy on this site that was running EFI and the system crapped out? Never heard what the problem or the fix was. At least, if a carb goes bad (and I doubt it will go bad enough, fast enough that it will quit running), you just borrow your buddies carb and keep going. Who keeps extra injectors, TPS, MAP, Temp, O2 sensors with them?
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Re: FI Tech VS Tuned Carb
[Re: sgcuda]
#2425202
12/29/17 01:23 AM
12/29/17 01:23 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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But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top On a carb, there is no wiring to change. And whatever happened to the guy on this site that was running EFI and the system crapped out? Never heard what the problem or the fix was. At least, if a carb goes bad (and I doubt it will go bad enough, fast enough that it will quit running), you just borrow your buddies carb and keep going. Who keeps extra injectors, TPS, MAP, Temp, O2 sensors with them? It was one wire that was routed wrong... very happy now and I wouldnt go back to a carb.. and I have a few of them in the shop.. will probably sell all or most of them.. the nice thing about EFI is if I want to change to E-85 today its just a couple of clicks and its done.. not like when I first swapped over to E-85 and I can go back and forth if I want to in a few moments
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Re: FI Tech VS Tuned Carb
[Re: MR_P_BODY]
#2425209
12/29/17 01:38 AM
12/29/17 01:38 AM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top On a carb, there is no wiring to change. And whatever happened to the guy on this site that was running EFI and the system crapped out? Never heard what the problem or the fix was. At least, if a carb goes bad (and I doubt it will go bad enough, fast enough that it will quit running), you just borrow your buddies carb and keep going. Who keeps extra injectors, TPS, MAP, Temp, O2 sensors with them? It was one wire that was routed wrong... very happy now and I wouldnt go back to a carb.. and I have a few of them in the shop.. will probably sell all or most of them.. the nice thing about EFI is if I want to change to E-85 today its just a couple of clicks and its done.. not like when I first swapped over to E-85 and I can go back and forth if I want to in a few moments ...with the right setup [Ethanol sensor], you don't even have to click a button to switch. Pretty slick!
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Re: FI Tech VS Tuned Carb
[Re: Dadodgekid]
#2425234
12/29/17 03:40 AM
12/29/17 03:40 AM
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Joined: Apr 2006
Posts: 1,012 Central US
grancuda
super stock
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super stock
Joined: Apr 2006
Posts: 1,012
Central US
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...but gasoline all over my intake is not exactly ideal when changing jets I just use a cut up little Comp Cams break in oil can & take the front bottom, drivers or rear passenger, lower bowl bolt out first & drain it into the bottle. It keeps the intake free or fuel. ...but on the Chinese built fuel injection systems, I can't help, I like carburetors & the ease of operation and the simplicity they give.
1967 Barracuda Formula S 383 1967 Chevy C10 Short Stepper 1980 Macho Power Wagon LWB 318 2021 Toyota Supra
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Re: FI Tech VS Tuned Carb
[Re: Dadodgekid]
#2425237
12/29/17 03:45 AM
12/29/17 03:45 AM
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Joined: Jun 2005
Posts: 6,257 gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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Depending on what fuel you run, the FI TECH unit will support 1200 HP on gas, not so on alcohol. My buddy has a 588 BB chevy that runs alcohol . The car slowed down .3 from 8.70 to 9.0 but it fires right off with the 15-1 compression and idles like a fairly stock car. If fi-teck would come out with a larger cfm body like a 1250 size I think the injection set up would run with the carbs. His thought on getting more cfm is to add another fi-tech on a dual four Holley Sniper sheet aluminum fabricated short tunnel ram. We'll see how that works in the early spring.
it's ok to butt heads, just don't do it with a butthead
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Re: FI Tech VS Tuned Carb
[Re: sgcuda]
#2425402
12/29/17 04:10 PM
12/29/17 04:10 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top On a carb, there is no wiring to change. And whatever happened to the guy on this site that was running EFI and the system crapped out? Never heard what the problem or the fix was. At least, if a carb goes bad (and I doubt it will go bad enough, fast enough that it will quit running), you just borrow your buddies carb and keep going. Who keeps extra injectors, TPS, MAP, Temp, O2 sensors with them? Do you carry around extra injectors, tpc, map, temp and o2 sensors when you take your modern daily driver down the road?
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Re: FI Tech VS Tuned Carb
[Re: DaytonaTurbo]
#2425432
12/29/17 05:27 PM
12/29/17 05:27 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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But it could be the last time you have to mess with it.. I've been real happy with my Holley EFI multi point after I made some wiring changes and I do love the aspect that if I want to change something its just a few clicks on the lap top On a carb, there is no wiring to change. And whatever happened to the guy on this site that was running EFI and the system crapped out? Never heard what the problem or the fix was. At least, if a carb goes bad (and I doubt it will go bad enough, fast enough that it will quit running), you just borrow your buddies carb and keep going. Who keeps extra injectors, TPS, MAP, Temp, O2 sensors with them? Do you carry around extra injectors, tpc, map, temp and o2 sensors when you take your modern daily driver down the road? Nope.. no need to.. if something crapped out I can buy it at the parts store.. mainly all GM stuff
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Re: FI Tech VS Tuned Carb
[Re: Dadodgekid]
#2425448
12/29/17 06:15 PM
12/29/17 06:15 PM
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Joined: Jan 2003
Posts: 31,078 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,078
Oregon
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Has anyone done a comparsion of the mean street 800HP capable FItech vs a well tuned carb for that particular combo? I have not done a back to back with the FI Tech but I've done back to back with the Holley EFI setup. No real power difference between carb and EFI but EFI allows you to "find" power much quicker. It can take a long time to figure out the correct jetting and ignition tune for an engine with a carb and distributor but EFI allows you to very quickly test different tunes. On the dyno we are able to test a bunch of tunes in just minutes on the EFI engines. With an old school carb and distributor it can take all day to dial in an engine. Even with a distributor machine it is painful to try different timing curves. Also, if you need stuff like start retard, high speed retard, two step, nitrous control, etc. you have to add a bunch of modules if you have a carb and distributor. If you have a good EFI system that stuff is all built in. The good EFI systems also have built in data logger so that is even more stuff that you don't need to buy and wire in.
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Re: FI Tech VS Tuned Carb
[Re: Dadodgekid]
#2425880
12/30/17 04:00 PM
12/30/17 04:00 PM
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Joined: Jan 2003
Posts: 17,926 Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,926
Akron, Ohio
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I'm a diehard carburetor guy and enjoy tuning them but I really like some of the positives about these new EFI systems.
One thing I've wondered about with EFI, can you set what RPM you want the motor to idle at in park and in gear? With a carb it can be quite a challenge to dial this in for us average tuners.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: FI Tech VS Tuned Carb
[Re: ProSport]
#2425954
12/30/17 05:45 PM
12/30/17 05:45 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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With the idle air it holds the RPM dead on... with the engine I am building now I will be going a fair amount bigger on the cam and it should control it easy but it will have a fair amount of lope to it EDIT I wanted to go back to a roller cam that was in the race car so I am(.695 lift on a 106 LSA
Last edited by MR_P_BODY; 12/30/17 05:49 PM.
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Re: FI Tech VS Tuned Carb
[Re: MR_P_BODY]
#2425955
12/30/17 05:47 PM
12/30/17 05:47 PM
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Joined: Mar 2007
Posts: 69 Palm City, FL
Dadodgekid
OP
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OP
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Joined: Mar 2007
Posts: 69
Palm City, FL
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With the idle air it holds the RPM dead on... with the engine I am building now I will be going a fair amount bigger on the cam and it should control it easy but it will have a fair amount of lope to it What EFI system are you using?
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Re: FI Tech VS Tuned Carb
[Re: Dadodgekid]
#2425960
12/30/17 05:54 PM
12/30/17 05:54 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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With the idle air it holds the RPM dead on... with the engine I am building now I will be going a fair amount bigger on the cam and it should control it easy but it will have a fair amount of lope to it What EFI system are you using? Holley HP.. its got all the stuff on it now.. its multi point and coil near plug.. I put the coils on the valve covers
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Re: FI Tech VS Tuned Carb
[Re: AndyF]
#2426363
12/31/17 03:26 PM
12/31/17 03:26 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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master
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Canada
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The Holley system will also increase the idle when the AC comes on. I think FAST might do that also. They have a sensor wire that connects to the AC and when it gets a voltage signal the idle speed will increase.
Yes the Fast system does that as well. I lot of the power comes from the infinitely adjustable timing curve. I run the fast xfi system and needs a laptop to tune. Being able to see what is happening is a big advantage. My car is a procharged street strip so the EFI made a lot of sense, at least for me. There are both advantages and disadvantages There is a learning curve for sure
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: FI Tech VS Tuned Carb
[Re: Kam*Kuda]
#2426395
12/31/17 04:01 PM
12/31/17 04:01 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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The Holley system will also increase the idle when the AC comes on. I think FAST might do that also. They have a sensor wire that connects to the AC and when it gets a voltage signal the idle speed will increase.
Yes the Fast system does that as well. I lot of the power comes from the infinitely adjustable timing curve. I run the fast xfi system and needs a laptop to tune. Being able to see what is happening is a big advantage. My car is a procharged street strip so the EFI made a lot of sense, at least for me. There are both advantages and disadvantages There is a learning curve for sure Oh yeah there is a learning curve.. there is so much data you can get you need to have that learning curve.. when I started with the Holley HP I was lost and needed some help with all of the stuff on it.. way more than I figured.. hell even working in the fuel lab and flowing injectors for months I couldnt get a grasp of it .. love it now and wouldnt change back
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