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 15Likes
06-17-2008, 12:26 PM
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CC Member
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Join Date: Jul 2004
Cobra Make, Engine: CSX 7030 HP 289
Posts: 137
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Not Ranked
A 289 with a Holley 4010 600 cfm vacuum sec. carb., FMS 303F roller cam, Edelbrock Performer RPM 2.02 intake heads, Hi-Po distributor with no vacuum advance, Tremec 3550, 3.54 rear, and 2.95/50-15 Dunlops yields a little over 22 mph highway. Which is okay but, in my quest for maximizing efficiency, it can do better. I read the Chevy mag article on carb tuning and it sounds promising; but I don't think it was written with the Holley 4010 in mind. One good thing is my little 289 runs just fine on 87 octane, a significant money saver. In SoCal I can drive it almost anytime I want. And I do, so I don't want operating expenses to enter into my decision as to which vehicle I'm going to drive. Tom
Professional Driver. Closed Course. Do Not Attempt.
Last edited by tnewland; 06-17-2008 at 12:38 PM..
Reason: addition
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06-17-2008, 12:58 PM
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Senior Club Cobra Member
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Join Date: Jan 2005
Location: VALLEY FORGE,
PA
Cobra Make, Engine: SUPERFORMANCE w DOUG MEYER ENGINE
Posts: 1,958
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Not Ranked
I got my car fine tuned (heck, it ran pretty darn well already) last week. They changed the springs in the distributor and changed the jets. The car now makes more power and gets considerably better mileage. I drove the car 280 miles last weekend and I figured I saved around 30 bucks in gas. To me, that is like free beer money  |
06-17-2008, 03:23 PM
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CC Member
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Join Date: Jun 2005
Location: Carmichael,
ca
Cobra Make, Engine:
Posts: 279
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Not Ranked
25.7 mpg hwy cruising at 70mph with no passenger with 3:08 rear and 5th overdrive. Runs around 2k rpm's doing that. Lately I have been "hypermilaging" the car, meaning running it in town in 4th or 5th at 35 to 45 mph and 55 mph on the freeway taking off really slow, keeping it under 2k for shifts and coasting in neutral. Not particullarly fun to drive in this manner, but it's paying off in the extreme. Can run the car all week commuting and driving all weekend and only use 8 gallons of gas. EFI and small blocks rule  -John
__________________
"What's behind me does not matter"
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06-17-2008, 03:39 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
Quote:
Originally Posted by jperickson2001
25.7 mpg hwy cruising at 70mph with no passenger with 3:08 rear and 5th overdrive. Runs around 2k rpm's doing that. Lately I have been "hypermilaging" the car, meaning running it in town in 4th or 5th at 35 to 45 mph and 55 mph on the freeway taking off really slow, keeping it under 2k for shifts and coasting in neutral. Not particullarly fun to drive in this manner, but it's paying off in the extreme. Can run the car all week commuting and driving all weekend and only use 8 gallons of gas. EFI and small blocks rule -John |
Sorry, I will keep my big block with the dual 4's.  |
06-17-2008, 05:23 PM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by Silverback51
Sorry, I will keep my big block with the dual 4's. |
Me too!
I want my Cobra to represent the power and prestige from the past. Not an economy car for today.
I don't drink or smoke so I get my pleasure from driving my car. |
06-17-2008, 07:11 PM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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Not Ranked
390, flat tops, edelbrocks, crane 343941, Blue Thunder intake, Holley 750 street HP, top loader with 3.27 rear.
Last 300 mile trip did 15 mpg.
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FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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06-17-2008, 07:36 PM
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CC Member
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Join Date: Jun 2004
Location: Sydney,
NSW
Cobra Make, Engine: Robnell BB 429 (Sold) Contemporary Cobra CCX3682
Posts: 407
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Not Ranked
What mileage??
My car burps when I switch it off! 
My wallet cringes when I rock up at a servo....@ nearly $1.65 per litre 
WHO CARES!! Just enjoy them.
Buy the Hybrid Kirkham if you're looking for economy.
My 2 cents
Stef
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Life really is beautiful!
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06-17-2008, 09:38 PM
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CC Member
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Join Date: Jun 2005
Location: Carmichael,
ca
Cobra Make, Engine:
Posts: 279
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Not Ranked
Quote:
Originally Posted by Naumoff
Me too!
I want my Cobra to represent the power and prestige from the past. Not an economy car for today.
I don't drink or smoke so I get my pleasure from driving my car. |
Hey, don't get me wrong. I drive the hell out of my cobra on the weekend, but I also "daily drive" the car to work across town. Why should I waste money driving it like I stole it everyday? -John
__________________
"What's behind me does not matter"
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06-17-2008, 10:28 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
patrickt says,
Quote:
Yes, but FE's will still be snickering at you behind your back....
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Eh eh, I'm still chuckling over that, has a certain ring of truth to it.
MPG also equals how often I have to stop and fill up, with a small tank that happens soon enough all ready. I've been watching my mpg since I got the car, just a habit, doesn't slow me down (much, yet,  ). I DO think twice about taking my Grand Cherokee V8 out for an errand or whatever (14 mpg). I DON'T think twice about taking the Cobra out for an errand or whatever and actually put more miles on the Cobra than the Jeep last year! |
06-18-2008, 06:54 AM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by jperickson2001
Hey, don't get me wrong. I drive the hell out of my cobra on the weekend, but I also "daily drive" the car to work across town. Why should I waste money driving it like I stole it everyday? -John
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To each his own. I wouldn't want to drive my car everyday. It is more of a weekend getaway for me.
I don't drive my car like I stole it every time I take it out.
Just for me a Cobra represents an era of brute horsepower from a simple carburetored engine with all its faults and it beautiful rawness. 
My daily driver is a work van loaded to the max. I am lucky if it get 10mpg.
Cheers
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06-18-2008, 07:55 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
Gas Milage????
Had to get my 2 cents in on this thread. I don't flog my Cobra but I do try to drive it with some energy. It's not a daily driver I have a 2000 Jag for the daily grind. The weather around here is tough for a car with no top of any kind. Either way it's your car drive as you will.
Jim Stern |
06-18-2008, 08:46 AM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by James Stern
Had to get my 2 cents in on this thread. I don't flog my Cobra but I do try to drive it with some energy. It's not a daily driver I have a 2000 Jag for the daily grind. The weather around here is tough for a car with no top of any kind. Either way it's your car drive as you will.
Jim Stern |
I think everyone should get a top and a heater/defroster when they build/buy their car.  |
06-18-2008, 10:09 AM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
Quote:
Originally Posted by Naumoff
I think everyone should get a top and a heater/defroster when they build/buy their car. |
Got them. Just don't use them. |
06-18-2008, 10:38 AM
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CC Member
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Join Date: Dec 2004
Location: Prince Frederick,
MD
Cobra Make, Engine: Unique 427 S/C 427 FE S.O. 484 cu in
Posts: 952
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Not Ranked
Quote:
Originally Posted by Silverback51
Got them. Just don't use them.
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Your choice but at least you have them. |
09-05-2009, 10:08 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,573
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Not Ranked
I got a good surprise today. I went to the Cars and Coffee in Denver, and on the way back stopped at the Shelby American Collection. Since the gas gauge still isn't calibrated I filled up on the way.
Specs: Roush 427IR (still not running fully correctly). 19.0MPG for a trip of about 130 miles.
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09-06-2009, 01:27 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Quote:
To each his own. I wouldn't want to drive my car everyday. It is more of a weekend getaway for me.
I don't drive my car like I stole it every time I take it out.
Just for me a Cobra represents an era of brute horsepower from a simple carburetored engine with all its faults and it beautiful rawness.
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Well said Naumoff
Rev happy 289, with lots of cam, 48IDA's, T10 4spd, with 3.70 gears gettiing about 17 MPG and who cares..........
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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09-06-2009, 01:30 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
I always thought with the Cobra it was measured in SPG?
SMILES per gallon!!!!
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Bagram AF Afghanistan
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09-06-2009, 06:46 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,593
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Not Ranked
Actually I thought it was gallons per mile, but who cares. Just driving one of these cars is enough to forget about the gas you are using.
Ron
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09-06-2009, 06:54 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
I'll agree to that.
I think mine drop through the floor when I changed CAMs, but I don't give a...
The car looks great and it is very fun to drive.
Maybe 6 in the city and 12 on the hwy?
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09-06-2009, 09:05 AM
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CC Member
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Join Date: Jun 2006
Location: Merced,
Ca
Cobra Make, Engine: West Coast-Ford Performance Solutions 533 BB
Posts: 390
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Not Ranked
It's my TOY!
An interesting topic, to be sure, but I bet most of us drive our Cobras less than 5000miles a year. At 10mpg's that's 500 gallons. Even if it cost $4.00 a gallon for premium that's $2000 a year max for fuel. If I change everything I can about my BB Ford's economy performance and drive it like a grandmother I'd save at most half of that..probably less....up to $1000 a year (max).
So...... let's see....our Cobras are luxuries (toys) on which we spend $50-150K to build and improve.... Why then would I give up the very essence of raw unmitigated power, brute delight, thrilling driving experience and beautiful sound that my car offers in order to save a few hundred dollars a year??? That's about the equivalent of a few days' hotels on a summer trip with the wiffie.
My wife's Escalade gets 10mpg except on long trips....now THAT's an ouch! 
Regards,
Dirk
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