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03-29-2010, 05:26 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
 Well it's not like ALL replicas are that "well designed". There is considerable variance between any given "kit car" manufacturer, home built, used vs new parts, taking measurements for that new drive shaft, jury rigged suspension mounting points, etc. There are even "home built" Shelby's and Kirkhams out there that might be suspect on some level. |
03-29-2010, 05:30 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,592
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Not Ranked
Quote:
Originally Posted by Excaliber
Well it's not like ALL replicas are that "well designed". There is considerable variance between any given "kit car" manufacturer, home built, used vs new parts, taking measurements for that new drive shaft, jury rigged suspension mounting points, etc. There are even "home built" Shelby's and Kirkhams out there that might be suspect on some level. |
Heck, maybe even some ERA's.  |
03-29-2010, 05:31 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: 22,025
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Not Ranked
Give up, Ernie. Just admit that IRS setups are a waste of money.  You will never, never change anyone's opinion. |
03-29-2010, 05:33 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: 22,025
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Not Ranked
Quote:
Originally Posted by RodKnock
Heck, maybe even some ERA's. |
I bet they just left 500 lbs. worth of parts off your car.  |
03-29-2010, 05:48 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,592
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Not Ranked
I'll tell you what I know. Yes, not much.
But! I've been to several "Vette Magic" drag races and shows, both at the old Baylands in Fremont and Sacramento, its current location. I've seen plenty mid-year Vettes with IRS's: a) torque steer and b) blow up their open and posi rear ends. u-joints here there and everywhere.
Patrick, how much does that 2nd roll bar, all the duct tape and HVAC insulation add in weight?
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03-29-2010, 05:52 PM
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CC Member
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Join Date: May 2001
Posts: 1,330
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Not Ranked
Quote:
Originally Posted by patrickt
Give up, Ernie. Just admit that IRS setups are a waste of money. You will never, never change anyone's opinion. |
The true test of character is... how we behave when we don't know what to do.
- John Holt |
03-29-2010, 05:54 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by patrickt
I bet they just left 500 lbs. worth of parts off your car. |
They only put ONE ton of aluminum on his car... 
__________________
Chas.
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03-29-2010, 05:56 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: 22,025
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Not Ranked
Quote:
Originally Posted by RodKnock
Patrick, how much does that 2nd roll bar, all the duct tape and HVAC insulation add in weight?
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That's not duct tape, that's black electrical tape.... remember?
Quote:
Originally Posted by ERA Chas
They only put ONE ton of aluminum on his car... |
It is not my imagination. You are indeed more clever this year than you were last year.  |
03-29-2010, 06:10 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,592
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Not Ranked
Quote:
Originally Posted by charlandk
Going with a Roush 427 sr/tw and T56 tranny, would you go with an open rear end or LSD and why?
Thanks,
Kevin
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Kevin,
If for no other reason, then resale value. The next guy will probably want the LSD. Eventually, you will either sell it and buy something else or sell it and buy a Cobra that's even "more better."
Now I'm kinda curious if my 328 with the Sport suspension has an LSD, though I haven't been able to break the tires loose yet in it. |
03-29-2010, 06:29 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by patrickt
That's not duct tape, that's black electrical tape.... remember?
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Electrical tape? I always thought you used pipe insulating foam to protect your roll bars from freezing.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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03-29-2010, 06:32 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: 22,025
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Not Ranked
Quote:
Originally Posted by Got the Bug
Electrical tape? I always though you used pipe insulating foam to protect your roll bars from freezing. |
Cheap roll bar padding from Summit, and even cheaper electrical tape. So far, no freezing and no electrical shocks. And just to provide an additional laugh, I have been doing it exactly the same way for over three decades. |
03-29-2010, 06:32 PM
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CC Member
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Join Date: Sep 2009
Location: Sacramento,
CA
Cobra Make, Engine: ERA 707, 446ci FE
Posts: 1,115
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Not Ranked
Quote:
Originally Posted by TButtrick
You infer that solid axle replicas operate outside of it's travel margins.
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I neither inferred, implied nor said any such thing.
The available rear suspension travel in a live axle Cobra, with its inky-dinky driveshaft, is substantially less than that of a much larger (longer and taller) Mustang or Kay-maro with (among other things) a four-foot driveshaft.
I would assume that any "well designed" live-axle Cobra limits that travel to safe margins - no body or frame impact and not exceeding the safety angles of the driveshaft joints.
__________________
= Si Opus Quadratum vis, angulos praecidere noli. =
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03-29-2010, 06:49 PM
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Senior Club Cobra Member
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Join Date: Jan 2001
Location: Santa Barbara, Ca.,
ca
Cobra Make, Engine: R.U.C.C. with a 427FE, toploader
Posts: 1,435
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Not Ranked
I was told that Patrickt made his roll bars out of sch 40 PVC to keep his IRS from bottoming out! 
__________________
Mike Z
Nothing sucks more than that moment during an argument when you realize you’re wrong. 
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03-29-2010, 06:49 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: 22,025
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Not Ranked
Quote:
Originally Posted by Gunner
The available rear suspension travel in a live axle Cobra, with its inky-dinky driveshaft, is substantially less than that of a much larger (longer and taller) Mustang or Kay-maro with (among other things) a four-foot driveshaft.
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Jeez, this is where Chas. and I left it last night -- the length of a radius and the arc of the circle. Three inches of lift on the end of a four foot driveshaft is going to have a significantly smaller angle than three inches on a foot long driveshaft. Tell TB to get a broomstick and a ruler and he can prove it to himself.  |
03-29-2010, 07:25 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
You know, 94 posts ago I should have told charlandk that any noob that was advised to get a Roush and T-56 should have figured an LSD was needed to play the Cobra game. My bad.
For your complete edification charland, there are virtually zero Cobras, real or fake with open diffs. No sense trying to put down 300 to 700 HP in a 90" car without one, right buddy? 
The post count meter was needlessly pegged on this one... 
__________________
Chas.
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03-29-2010, 07:48 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
Actually there appears to be a healthy debate underway about how GOOD BDR's are with an open diff, on another thread. "Over there" I have followed my good mentors lead (thank you Pat) and am doing my best to confuse, thwart and baffle those who would dare oppose my view point.
The crux of the argument appears to be that an open diff is safer than an LSD, which is true of course. But then begs the question: You want "safe" and 500 plus horse power in a 90" wheel base car? OOKKKK then.... |
03-29-2010, 07:59 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: 22,025
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Not Ranked
Quote:
Originally Posted by Excaliber
I have followed my good mentors lead (thank you Pat) and am doing my best to confuse, thwart and baffle those who would dare oppose my view point.
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I've been following it. I think it's time to taunt him with a butt-salute.  |
03-29-2010, 08:24 PM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,124
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Not Ranked
Quote:
Originally Posted by Excaliber
Actually there appears to be a healthy debate underway about how GOOD BDR's are with an open diff, on another thread. "Over there" I have followed my good mentors lead (thank you Pat) and am doing my best to confuse, thwart and baffle those who would dare oppose my view point.
The crux of the argument appears to be that an open diff is safer than an LSD, which is true of course. But then begs the question: You want "safe" and 500 plus horse power in a 90" wheel base car? OOKKKK then.... |
You should try 92" |
03-29-2010, 08:43 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by undy
If I could get an IRS setup that was resonably priced and had the strength of my 31 spline 9" Ford then I'd be conducive to having one. 400 or 500 lb ft ratings just won't get it.
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A few years back at Carlisle, I saw an IRS setup that used a Ford 9" for the center section. The rest of the set up looked as beefy, too. I liked it. |
03-29-2010, 08:48 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Quote:
Originally Posted by Excaliber
OK, here's the pic Olddog. Yup, limited axle movement with a live axle.
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Thanks for posting the Picture. |
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