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CC Advertisers
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04-19-2009, 09:46 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: 5,629
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Not Ranked
I got mine out on the highway for the first time today. Mine is a Roush 427IR, TKO600, 3.54 rear end, 295/50x15 tires. It was ~3000RPM at ~75MPH in 5th.
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04-20-2009, 01:28 AM
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Senior Club Cobra Member
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Join Date: Sep 2002
Location: Montgomery,
TX
Cobra Make, Engine: CR 427 S/C, 351W, 5 Sp & KMP142 - 427 SO, 4 Spd
Posts: 2,212
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Not Ranked
My CR is very close to SC's, about 78 @ 2,000 with a 3.27 and .64 in a T-5 Z.
My 1 in 10 addition of 110 AvGas enables me to cruise at 60 no problem.
The Kirkham is another story - 3.54 rear and a 4 spd toploader gives me a
little over 60 @ 3,000. I may see a TKO 600 going into that in the future -
I like that 5th speed and don't have a trailer so I plan on driving it.
__________________
Flip
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04-23-2009, 01:13 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 YerDugliness
Like others, I suspect that he was in 4th.....will verify for sure Wednesday PM.
Dugly  |
Well, it wasn't 4th, it was 5th, but he was way high on his estimate. The RPM's at 70 mph was between 3200 and 3400. Still a bit higher than I would like to hear. I got the tire size and may fool around for a while in that formula. I suspect that the differential ratio is lower than he realized....there was a receipt for a rebuild of the differential in that stack of paperwork I saw.
Still, much more tolerable than 4K  !!
Dugly
__________________
YD,E./PNB
No names were changed to protect the innocent! 
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04-24-2009, 03:34 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,291
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Not Ranked
Yep, something still isn't right. Using a RPM calculator, with a 3.70 final drive, a .68 overdrive and an assumed 26" tire height you will be turning 2276 RPMs at 70 mph. To get 3383 RPMs @ 70 mph would require a 5.50 rear gear ... I think not! Possibly your tach is fun-goo'd or your speedo is waaaaay out of calibration.
__________________
Too many toys?? never!
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04-29-2009, 10:07 AM
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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
Yeah, I used a calculator I found online and for a 295/60 15" tire, using the 0.68 gearing in the T-5 OD and the 3.7 differential gearing, I get 2050 RPM at 70 MPH. That's exactly the range I was hoping for!
I did manage to talk to the previous owner (2nd back) and he suggested that perhaps there is a 6 cyl/8 cyl switch on the back of the tach that is set on 6 cyl. The guages are entry level VDO's, so.......we'll see, I am about 5 days from being able to take possession.
He also verified that the rear gear ratio is 3.70.
Dugly
__________________
YD,E./PNB
No names were changed to protect the innocent!
Last edited by YerDugliness; 04-29-2009 at 10:11 AM..
Reason: spelling/additions
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