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04-16-2009, 02:04 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
Quote:
Originally Posted by jhv48
I think he was talking about 4th gear....Might be a race engine. In that case, make sure you can live with that on the street. Not real friendly in traffic.
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What little I know about it doesn't seem to indicate it is a race engine. The motor is reported to be a stockish 1989 5.0HO long block, not EFI but a simple Edelbrock manifold and small (500CFM) Edelbrock carburetor--not exactly exotic race stuff there.
Too many of you have reported 5th gear highway RPM's in the range I would have expected, the gentleman must have been mistaken about the gear he was running in. He does live right in the middle of Dallas, TX, so perhaps he was in 4th.
That would be the my hope for the way things turn out.....I'll have to drive that thing 300 miles to get it home and eventually over 800 miles to get it to my retirement home.....not exactly a happy prospect with 4,000 RPM's exiting through sidepipes less than 3' from your ears! He does say that at road speeds he can hear the sound system, so.........perhaps the tach is out of calibration?
Thanks, guys....maybe I won't need to go to the expense of changing out the rear pumpkin after all. that would make me  !!
Dugly 
__________________
YD,E./PNB
No names were changed to protect the innocent! 
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04-16-2009, 02:15 PM
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CC Member
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Join Date: Feb 2009
Posts: 1,695
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Not Ranked
I have 4.56's in the rear and a .56 O/D. Cruises at just about 2300 at 70 mph. The 4.56's are about to be gone and 3.90's installed. That should drop it another 300 RPM at 70.
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04-16-2009, 02:28 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Maybe he thinks he has a 4 speed tranny and never used fifth!
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Jim
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04-16-2009, 03:02 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
I know he knows it's a 5 speed. When I emailed him, mentioning how much higher RPM he was claiming than most report, he responded thus:
"Doug,
I rarely take the Cobra out on the highway, so my estimation was a guess."
I'm feeling much better about this all the time, with numbers like those reported by Joyridin' I'm sure my contact must be mistaken. According to my calculations, our final drive ratios would be in the same general range (his 4.56 X .56 OD = 2.55 final ratio, my 3.70 X .68 OD = 2.51 final ratio), so I'm expecting numbers pretty close to those reported in Joyridin's post above.
Thanks, guys!
Dugly
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YD,E./PNB
No names were changed to protect the innocent!
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04-16-2009, 03:13 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Obviously driven very sanely then.
In my car I know exactly how many rpm's I'm turning and what speed I'm going when I hair out and back off of the throttle!
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Jim
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04-16-2009, 03:25 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
Looking forward to that experience !!
Dugly
__________________
YD,E./PNB
No names were changed to protect the innocent!
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04-16-2009, 03:39 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
You'll love it!
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Jim
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04-16-2009, 04:08 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,000
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Not Ranked
A Suggestion...
YerDugliness -- as a general rule, most owners of Cobras kinda know their car, and know things like RPMs at different speeds, and even take it out on the highway.  Remember, not everybody tells the truth when selling a used Cobra. Sooooo, keep you eyes open and don't get swept away by the allure of the deal. There are plenty of Cobras out there and if you start to feel like you're not getting the full scoop, then you're probably not. 
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04-16-2009, 10:06 PM
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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
Decision made
Well yep thanks for all the inputs, I'll keep my 2.75 rear end and work on improving engine breathing in/out to improve that response...my wiffie and I are planning some leisurely long travels and she ALREADY thinks my car is too lound even with the restrictive baffles (that I'm going to enlarge)....what price a noise cancelling set of BOSE earphones for her?? 
Thanks again!
Dirk
__________________
The government giveth and the government taketh away..... if our rights are not God given then they're subject to revision!
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04-16-2009, 10:27 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Quote:
Originally Posted by DocDirk
Well yep thanks for all the inputs, I'll keep my 2.75 rear end and work on improving engine breathing in/out to improve that response...my wiffie and I are planning some leisurely long travels and she ALREADY thinks my car is too lound even with the restrictive baffles (that I'm going to enlarge)....what price a noise cancelling set of BOSE earphones for her??
Thanks again!
Dirk |
About $300, and well worth it!
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Jim
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04-17-2009, 12:28 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Not Ranked
4000 in 5th gear @70MPH with 3.73's >???? only on really tiny tires....
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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04-17-2009, 03:31 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: 26,592
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Not Ranked
3:91 gears and 65MPH at about 3300 RPM. Has great acceleration from that range.
Ron
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04-17-2009, 03:35 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
Quote:
Originally Posted by PANAVIA
4000 in 5th gear @70MPH with 3.73's >???? only on really tiny tires....
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My first thought, exactly......and they aren't, the photos show a fairly typical Cobra profile, no "donut" spares on that Ford 9" rear end--real meaty things, they are.
I asked how accurate the speedometer is, he said: "The speedometer is relatively accurate."
Like others, I suspect that he was in 4th.....will verify for sure Wednesday PM.
Thanks for the help, guys.....if this thing really is spinning at 4K at 70 mph, well, that rear gear's way lower than a 3.70!!!!!!!!
Dugly
__________________
YD,E./PNB
No names were changed to protect the innocent!
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04-17-2009, 04:49 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Meriden,
CT
Cobra Make, Engine: ERA 427 SC s/n 718, 428 FE
Posts: 1,731
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Not Ranked
I'm at about 2900 at 70 MPH (give or take) with 3:31's in a toploader. Makes good power and gets fair MPG. No OD in this beast.
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"Paint It Black, Black As Night"
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04-17-2009, 07:09 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 18,997
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Not Ranked
3000rpm at 70mph in 4th
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04-17-2009, 08:22 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 4,926
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Not Ranked
MY enjoyable highway cruise RPM is whatever keeps me in front of that vehicle in the next lane!!! lol !!!
1900 RPM @ 80 MPH, 3.27 gears, T5 with .64 OD, 351W
__________________
Of course it's REAL! You are NOT imagining it!
We don't want a bigger government; We want a government that does a few BIG things, and does them right.
If you think that you can cut it, if you think you got the time, they'll only give you one chance, better get it right first time. 'Cause in this game you're playin, if you lose you got to pay. And if you make just ONE wrong move, you'll get BLOWN AWAY!
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04-17-2009, 10:07 PM
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CC Member
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Join Date: Mar 2008
Location: fremont,
ca
Cobra Make, Engine: superformance/427 fe ford
Posts: 436
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Not Ranked
3:46 x .064 OD @ 2050 rpm = 80 mph. but thats just me in mine
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1952 MG TD - 53 HP 1970 SS454 Chevelle - 900hp 2007 spo2669 - 485hp 2001 Spclconst. softtail - 114HP 2006 Roadglide - 88HP
sold Roadglide.....bought 09 XR 1200 - 90 hp stock
i would rather live one day as a lion, than one thousand days as a lamb.
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04-18-2009, 07:07 AM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
351W, close ratio T-5 with .82 OD, and a 3.50 9" rear, I turn 1850 at 65 mph with all the power I want to spare. No sense screaming down the road at 2800+ RPM.
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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04-18-2009, 02:58 PM
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Senior Club Cobra Member
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Join Date: Jan 2008
Location: McAllen,
TX
Cobra Make, Engine: Butler...488" hi-rise, dry-sump FE s/o w/stacks
Posts: 543
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Not Ranked
With a 1:1 5th gear (Doug Nash 4+1), 2.36 in the rear and 335x35x17's....66 MPH at 2000 and 72 MPH at 2200. Nice cruising, somewhat decent gas mileage and still plenty of torque to accelerate. Can actually hear the passenger and not much hearing damage.
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Russ 
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04-18-2009, 04:08 PM
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Senior Club Cobra Member
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Join Date: Feb 2006
Location: McKinney,
TX
Cobra Make, Engine: SPF #867 gone....
Posts: 1,272
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Not Ranked
.64 OD and 3.73 gives me 2400 rpm at 80 mph and 21 mpg on the highway. If your traffic is stuck around 60 mph though, you're high in 4th because the rpm's are too low (1800)for 5th.
Unless the track has a really long straight, I can keep it in 4th and never need 5th on the track. It's just for the highway.
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MadMiles442
She said, "The only thing I'll ask of you, you gotta promise not to stop when I say when..."
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