Club Cobra GasN Exhaust  

Go Back   Club Cobra > Cobra Talk Areas > ALL COBRA TALK

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Keith Craft Racing
Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
Keith Craft Racing
Keith Craft Racing
September 2020
S M T W T F S
    1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30      

Kirkham Motorsports

Like Tree12Likes

Reply
 
LinkBack Thread Tools Display Modes
  #101 (permalink)  
Old 09-08-2020, 04:14 AM
t walgamuth's Avatar
CC Member/Contributor
Visit my Photo Gallery
Gold Star Contributor
 
Join Date: Jan 2018
Location: Lafayette, IN
Cobra Make, Engine: Looking to buy
Posts: 1,052
Not Ranked     
Default

As for the original thread question....if you have to ask you can't afford it!
__________________
Cobra loving, autocrossing Grandpa Architect.
Reply With Quote
Sponsored Links
Sponsored Links
  #102 (permalink)  
Old 09-08-2020, 07:25 AM
lnfletcher's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Alexander, AR
Cobra Make, Engine: B&B 427 Stroked Windsor TKO 600 w/3.50 posi 9"
Posts: 775
Not Ranked     
Default

New 427w just broke in and I'm getting 16 best and 11.4 the worst so far. 14.5 overall average after 118 gallons and 1715 miles on it. Somewhat easy for the first 1000, not so much for the last 700!
Reply With Quote
  #103 (permalink)  
Old 09-08-2020, 11:15 AM
cycleguy55's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2014
Location: White City, SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,336
Not Ranked     
Default

I'm thinking of going EFI primarily to improve my range. I'd like to be able to enjoy some longer cruising outside of urban areas and improved fuel economy would give me the range to do that. IMO it's certainly a better alternative to filling the entire trunk with a ginormous fuel tank. LOL

Any before and after 'real world' experiences with carb to EFI (both throttle body and multi-port systems)?
__________________
Brian
Reply With Quote
  #104 (permalink)  
Old 09-08-2020, 12:41 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 1,366
Not Ranked     
Default

Use the multiport alternative, Brian.

Give a good look at the MS3Pro Plug and Play system that DIY autotune has for the 03/04 Mach 1's. It uses an OEM harness with OEM sensors and is programmable for any engine size you might want to use. Great engine protection, traction control, knock detection and prevention s/w that uses OEM Ford sensors. Get an engine harness out of a salvage yard and you are good to go. Here is a link => MS3Pro PnP and here is an install video, click here => Install Vid. they ship it with a tune ready to go. When you change engine displacement the ECU scales the tune for the change in displacement. DOHC or pushrods make no difference unless you go for a TiVCT deal like a Coyote an then you just disable the variable cam timing with a mouse click.

ECU comes with a tune ready to go, OEM Ford sensor expectations, tuning software and data logging software.


Ed
__________________
Help them do what they would have done if they knew what they could do.

Last edited by eschaider; 09-08-2020 at 03:00 PM.. Reason: Spelling & Grammar
Reply With Quote
  #105 (permalink)  
Old 09-08-2020, 03:27 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 1,366
Not Ranked     
Default

Talk about brain fade! I forgot about an intake for your 460 project. Here is an EFI Weber look-alike intake with throttle bodies, fuel rails, throttle linkage etc, that comes in at $2266;

Here os a link to the Speedmaster webpage, click here =>
Polished 460 Weber Style EFI Intake-Manifold System Complete


Ed
__________________
Help them do what they would have done if they knew what they could do.
Reply With Quote
  #106 (permalink)  
Old 09-08-2020, 04:44 PM
Tom Wells's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: St. Augustine, FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
Posts: 1,724
Not Ranked     
Default

Brian,

I've used the Holley MPFI setup for more than 15 years - maybe close to 20? Yeah, I was what amounted to a Beta tester for the things.

They're pretty good now though it would be good to have someone knowledgeable apply the final tweaks.

I use 60lb injectors.

The first setup I put together there was no manifold with bungs, so we had to drill & weld them in. Pain. That was on the 521.

The 557 has the Edelbrock 50665 manifold and was easier, although the manifold I received from Edelbrock was defective - and they refused to repair or replace it... I ended up filling their casting mistake at the front of the block with another piece of aluminum and it has worked fine for about 15K miles so far.

If you go this route, be sure to check the china wall at the front of your block to make sure the manifold extends far enough forward to capture the silicon bead that forms the seal around the distributor area.

The self-tune at first is pretty good.

Advantage was that the car no longer had any problems with underhood heat after a run on the highway. When it had a carb, the fuel in the bowls would boil the alcohol and geyser the fluid out of the bowl vents into the engine, which would promptly flood and quit. I tried for a couple of years with insulators, heat shields float levels - you name it. Never solved it. The EFI solved that.

I did have to use an Aeromotive Stealth (or was it Phantom?) in-tank pump and sump combo on one car and that works fine. On the Cobra I used a sump built into the bottom of the tank for the inlet to the pump to stay submerged while cornering. Think 3 dimensional drag racing fuel pickup tank.

Gas mileage is good, car runs fine on the street and track - for over 35K miles - no complaints.

If you're less concerned about the attendant problems of vacuum storage, air filters, airflow and linkage synchronization etc etc you might consider the 8-stack - it sure is pretty!

Unless you know more than the average Joe, the Holley (or similar) 1000CFM throttle body looks kinda liks a carb. Most folks don't see the fuel rails until I point them out. This throttle body gives an extra ~3/4" (forgot exactly) of reduced height compared with a carb so a taller air filter can be used.

If you are comfortably under (I think) 600 flywheel HP then maybe a throttle body with 4 healthy injectors might be another, possibly simpler, route to consider. You could use your present intake.

Keep us posted as to what you decide,

Tom

EDIT: Whoops! Almost forgot. My mileage seems to correlate quite nicely with the position of my right foot ;-) I'd love to know enough to tune that aspect of the setup; maybe I'll have to take a class from Holley (they do teach them in Bowling Green). As it is, 10 is probably the most frequent number I see if I'm driving gently. As to what's possible, a friend (Herb Smith) once tuned the carb on the 557 to achieve 16MPG at a steady 60MPH!

Tom
__________________
Wells's law of engine size: If it matters what gear you're in, the engine's too small!

Last edited by Tom Wells; 09-08-2020 at 04:56 PM..
Reply With Quote
  #107 (permalink)  
Old 09-09-2020, 09:13 AM
CC Member
Visit my Photo Gallery

 
Join Date: Aug 2008
Location: Tahoe/Truckee, ca
Cobra Make, Engine: Ford Racing 363/8-stack injection, SPFR0012
Posts: 260
Not Ranked     
Default

We have the 8 stack injection, on a 363 and average 17mpg. Going on two years, and I still don't feel that we have a good tune on it. Almost ready to go backwards and replace the injection with a carb.

Mark.
Reply With Quote
  #108 (permalink)  
Old 09-09-2020, 10:29 AM
Dwight's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,421
Not Ranked     
Smile

Moto One

what ECU are you using?
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Reply With Quote
  #109 (permalink)  
Old 09-09-2020, 01:19 PM
TLHanna's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2020
Location: Hazel Green, AL
Cobra Make, Engine: Backdraft 427w
Posts: 30
Not Ranked     
Default

I'm curious too as my FAST 2.0 EZ works great. I would never scrap all of that in favor of a four barrel.
Reply With Quote
  #110 (permalink)  
Old 09-15-2020, 08:40 PM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2013
Location: Memphis, TN
Cobra Make, Engine: SPF#1867 , KC427
Posts: 423
Not Ranked     
Default

427w with a QF 750 carb and a mildy aggressive cam. I would say 8 mpg no matter how you drive it.
Reply With Quote
  #111 (permalink)  
Old 09-16-2020, 12:55 PM
RB60's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2017
Cobra Make, Engine: Unique - 427 side oiler
Posts: 131
Not Ranked     
Default

Still 10-12mpg. if I'm not into it too much. Same as last year. Same as the year before that...
Reply With Quote
  #112 (permalink)  
Old 09-16-2020, 02:00 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2014
Location: Rocklin, Ca
Cobra Make, Engine: Superformance , Roush 427SR dyno'd at 526 hp
Posts: 150
Not Ranked     
Default Mileage

Roush 427 based on a 351W. Between 7 and 8 miles without getting into it.🥺

Last edited by Lou1119; 09-16-2020 at 02:01 PM.. Reason: Correctin
Reply With Quote
  #113 (permalink)  
Old 09-16-2020, 02:23 PM
bwcobra15's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2000
Location: Midlothian, TX
Cobra Make, Engine: Hurricane 427 Cobra #HM2008, Craft Performance 427w 600hp/600tq, TKO-600 close ratio, original Smiths gauges, lucas switches
Posts: 934
Send a message via Yahoo to bwcobra15 Send a message via Skype™ to bwcobra15
Not Ranked     
Default

Craft Performance Engines 427w, AFR205 heads, QF 780 carb, TK0600 close ratio .82 OD = 10mpg. 11mpg if I dont mess around...
__________________
Bob Worley
Hurricane HM-2008 build is done!! (for now....)
Craft Perfomance 427W / 600hp / 600tq - TKO600

I love it and I need it I bleed it ~ Yeah it's a wild hurricane ~ Alright, hold tight, I'm a highway star!!
Reply With Quote
  #114 (permalink)  
Old 09-19-2020, 04:19 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2017
Location: Harrison, AR
Cobra Make, Engine: BDR, 418
Posts: 168
Not Ranked     
Default Gas Milage???

Holy crap, you guy's actually figure your gas mileage? Good for you cause I don't have the ba**s to check mine...i guess next fill up I'll check it just for the hell of it. I've got a windsor stroked to 418 dynoed at 525 hp. 3:73 rear. I'm not real sure I want to know ablut this miles per gallon....sometimes ignorance is bliss!
Reply With Quote
  #115 (permalink)  
Old 09-19-2020, 04:44 PM
CC Member
Visit my Photo Gallery

 
Join Date: Aug 2010
Cobra Make, Engine: Lone Star with IRS, 427W with megasquirt, T56 magnum
Posts: 285
Not Ranked     
Default

I have a 427W and Megasquirt 2 and get between 19 on the highway putting at 2500 RPM in 6th to 6 or so keeping the R's high and driving full open or hard brakes

I also have MS2 on a 383 in a 71 vette with a cheap chinese 8 stack, and it's surprisingly well mannered. I'm running it in a hybrid alpha N/speed density mode that works very well. Under light loads where there is a vacuum signal it's speed density but when you open it up, it goes to alpha N and pours the fuel.
Reply With Quote
  #116 (permalink)  
Old 09-19-2020, 05:41 PM
Dwight's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,421
Not Ranked     
Smile

When you plan on driving 1100 miles then you need to know what mileage your getting so you can plan your gas stops.
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Reply With Quote
  #117 (permalink)  
Old 09-19-2020, 08:18 PM
Moritz55's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jan 2020
Location: Raleigh, NC
Cobra Make, Engine: Superformance, '65 427/MKIII with Roush V8 - 351W w/770cfm 4BBL Holley, 514hp
Posts: 41
Not Ranked     
Default

My 427SR Roush (351W) with QF 770 Holley & 5sp TKO-600 ... has 22k+ miles on it.... still get ~11.5mpg City... 16mpg Hwy ... Just tuned it 2months ago .. I can get 250-260miles on a tank full if I drive mostly highway with a couple gallons to spare...
__________________
Many thanks,

Mark


Superformance: SPO2454 , Titanium w/Black Stripes
Engine: Roush 427SR w/770cfm 4-Barrel Holley
Transmission: Tremec TKO-600

Last edited by Moritz55; 09-20-2020 at 04:51 AM..
Reply With Quote
  #118 (permalink)  
Old 09-19-2020, 10:05 PM
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2018
Location: Ripon, Ca
Cobra Make, Engine: Unique 427 Side Oiler
Posts: 23
Not Ranked     
Default

I have a Unique 427SO, Holley carb, top loader 4 speed and 3.55 gears and have never gotten better then 8 to 10mpg in town and maybe 12 on the highway. Iím sure like the rest of us the mileage would improve if I drove it like a Prius and not a Cobra.
Reply With Quote
  #119 (permalink)  
Old 09-20-2020, 02:40 AM
RB60's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2017
Cobra Make, Engine: Unique - 427 side oiler
Posts: 131
Not Ranked     
Default

Had a little fun with a few friends ('20 Porsche GT4 and an '07 supercharged and tuned Mustang GT) on the interstate today. Averaged about 7 mpg for the day
Reply With Quote
  #120 (permalink)  
Old 09-20-2020, 07:05 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2020
Cobra Make, Engine:
Posts: 24
Not Ranked     
Default

duplicate post

Last edited by S1965C; 09-20-2020 at 07:08 AM..
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 11:26 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink