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03-30-2010, 10:08 AM
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CC Member
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Join Date: Feb 2010
Location: Honolulu HI, East Haddam, CT, Middletown,
HI
Cobra Make, Engine: BDR #656 402 SR TW
Posts: 179
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Not Ranked
Rick thanks again, and you always give good advice.
Kevin, good luck, look forward to hearing how you like the rear later on.
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03-30-2010, 10:11 AM
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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: 9,591
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Not Ranked
Quote:
Originally Posted by charlandk
While I have no intentions of ever selling this car, I believe that I will have more luck with resale if I were to have the LSD.
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Hey, I think I said that over on your other thread.
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03-30-2010, 10:45 AM
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CC Member
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Join Date: Feb 2002
Location: Bradenton Florida,
FL
Cobra Make, Engine: BDR 930, 427 Windsor T56
Posts: 658
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Not Ranked
I'm sure you'll be happy. Now on the hard decisions like what color.
__________________
Jim Pomroy
Have Fun!
BDR #930
08 Corvette Coupe
92 Sunburst Yellow Miata
#81 Saturn V Miata Crapcan racer
Panoz GTRA #42
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03-30-2010, 10:52 AM
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CC Member
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Join Date: Feb 2010
Location: westfield,
ma
Cobra Make, Engine: BDR # 866 Roush 427 SR/TW
Posts: 101
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Not Ranked
that part was not very difficult.
Sterling Gray with Silver stipes and thin raceway blue accent stripes on the outside of the silver. Not sure how to insert a picture of what it will look like.......
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03-30-2010, 11:19 AM
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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: 5,121
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Not Ranked
Concept...
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03-30-2010, 11:26 AM
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CC Member
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Join Date: Feb 2010
Location: westfield,
ma
Cobra Make, Engine: BDR # 866 Roush 427 SR/TW
Posts: 101
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Not Ranked
thanks Jay
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03-30-2010, 11:31 AM
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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: 9,591
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Not Ranked
Quote:
Originally Posted by charlandk
that part was not very difficult.
Sterling Gray with Silver stipes and thin raceway blue accent stripes on the outside of the silver. Not sure how to insert a picture of what it will look like.......
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That's pretty "ironical." Color choice is generally very difficult for most, including me, and the LSD is generally an automatic for most.
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03-30-2010, 12:15 PM
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CC Member
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Join Date: Jun 2008
Location: West Suburbs of Chicago,
IL
Cobra Make, Engine: Backdraft#357, 392CI Ford Racing, 459hp, 455ft/lbs , TKO 500, 3.43 Gears, Ceramic Coated Headers, Victor Jr. 750cfm, 17in Halibrand wheels, Sterling Gray/Silver Stripes, Gray Leather, Nitto NT05
Posts: 362
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Not Ranked
Color Choice and Diff
Picking that color combo is easy Oh, I have an open differential on my Sterling Grey and Silver Strip car and it works just fine on the street and strip. Listen to Jay on this one.
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03-30-2010, 04:40 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 2,752
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Not Ranked
Quote:
Originally Posted by Cashburn
The Sebring video is a TD car that is not sold for street use, yes it has the LSD and a lot of other things for the track. Video also shows a French driver (note flag on helmet) and not Reg.
That's my theory...
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Yes all true Cashy...... and it looks just lovely in my garage now! In my other cobras I run a semi locked diff as well but they aren't BD so I won't pass comment.
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03-30-2010, 05:01 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Not Ranked
Well here is another take on it.... if a bdr handles so well with an open diff just think how well it handles with and LSD.
I am an advocate for the LSD.
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03-30-2010, 06:11 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: 5,121
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Not Ranked
Quote:
Originally Posted by spookypt
Yes all true Cashy...... and it looks just lovely in my garage now! In my other cobras I run a semi locked diff as well but they aren't BD so I won't pass comment.
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So you are the new keeper? I did not realize same person... good luck, to all the other racer Cobras in Australia now
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03-30-2010, 07:59 PM
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CC Member
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Join Date: Oct 2006
Location: Philly Suburbs,
PA
Cobra Make, Engine: BDR#436 - 351W - 450HP / 429TQ
Posts: 242
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Not Ranked
I have a 450HP 351 with a T5 trans and 3.91 open rear. Never any problems with traction or kicking it sideways on demand. Every winter I thought about swapping the rear for a 3.91 LSD...still may do it, but I'm still very happy with what I have...
__________________
Eric
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03-30-2010, 09:49 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 2,752
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Not Ranked
Quote:
Originally Posted by Cashburn
So you are the new keeper? I did not realize same person... good luck, to all the other racer Cobras in Australia now
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Yeah mate...the goss is slowly bleeding out here in OZ.
Sorry for off topic hijack.
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04-01-2010, 02:11 AM
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CC Member
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Join Date: Aug 2003
Location: San Diego,
CA
Cobra Make, Engine: BDR #455, KC427W, TWM-FI
Posts: 727
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Not Ranked
sorry I did not read all of the responses...I wanted to skip the b!tching.
I have a 427W, T-56, M3 LSD and race springs. I think this is a pretty similar setup to what you are looking for. I can not comment on an open-diff. But with my LSD, I have had no problems with tracking around corners and never had the rear unpredictably kickout, never. When I want it to kickout it is easy to do and also VERY EASY to recover. It is so predictable I am thinking of going with bigger sway bars to stiffen it up a little more but I'm working on other upgrades (solid mounts for the engine, diff, x-member).
I (well at least use to) live in CA. The T-56 is great, highway speeds are normally 75mph, so the 6 gear with a 3.46 rear has worked well. ...yes I will be back in CA soon, gotta love the military life.
I didn't read how you were going to use it. I do both daily driver and SCCA.
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04-01-2010, 03:29 AM
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CC Member
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Join Date: May 2002
Location: Ashburton, New Zealand,
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Cobra Make, Engine: UK Ram SC. KC-Yates 373, Jerico 5 speed.
Posts: 1,240
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Not Ranked
Bdr
Interesting topic and opinions.
My cobra although not a BDR is a UK version RamSC I have fitted a 675bhp nascar based alloy engine with race box etc, and all the good AP brakes, 8.8 irs with Eaton carbon posi and on it goes, there isnt a decision on whether I should run an open diff or LSD because an open diff wouldnt cut the mustard, the decision is more like either LSD, locker or a spooled diff. All the cars I have driven with an open diff I have soon found the inside wheel generally breaks loose with loss of traction.
I am no M Schumaker, and probably most of you BDR drivers with BMW rear end and good suspension design makes good use of an open diff which is fine for most drivers, but for serious horsepower and track use the open diff is a waste of time period, you dont see race cars with open diffs unless they were little light Lotus type of cars of the 1960's which never seemed to really need a LSD!
Interestingly enough back a few years when I had a Bathurst Monaro and a friend had a Falcon XA GT 351 both had LSD and on a wet off cambered road these cars could easily catch out the inexperienced drivers when you gave them a heap of gas which could result in a spin or tank slapper, they didnt have good steering either....!
I do apologise for giving a non BDR opinion but I am bored and have posted for a while.
__________________
A J. Newton
The 1960's rocked!
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04-05-2010, 07:16 PM
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Senior Club Cobra Member
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Join Date: May 2005
Location: Glendale,
CA
Cobra Make, Engine: Backdraft #395 from Vintage Motorsports; Valley Ford Specialist 487 FE with a TKO600
Posts: 498
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Not Ranked
No matter which rearend...with the power you say your motor will be making, make sure you beef up the differential support. The BDR TD cars come with something already, and there are aftermarket kits for it.
Here is one... http://www.aatuning.com/viewproduct.aspx?id=Product42
I have run into three separate folks here in SoCal that have had this issue, where the support bolt snaps. For the record, all of them had the larger bolt in there differentials.
As for Gearing...I would not recommend going higher than 3.46. Great gear for quick burst and for highway driving.
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04-18-2010, 11:24 AM
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CC Member / Sponsor
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Join Date: Oct 2003
Cobra Make, Engine:
Posts: 808
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Not Ranked
Quote:
Originally Posted by Excaliber
Never said they were a bad car. I doubt there are any BDR's competitively running a road course with an open diff, Gator included. I seriously doubt there are any BDR's running under 12 seconds in the 1/4 with an open diff and street tires (personally I run in the 11's, with street tires). Traction, across the board, for ALL Cobras is the number one limiting factor when it comes to performance, accelleration or cornering.
For the best performance it's just a no brainer, you need an LSD of some kind. If your mostly street driving, going in a straight line, not seriously running SCCA events, are happy with a mid 12 or low 13 second quarter mile time on street tires or willing to run slicks (I wouldn't on the street) then an open diff may work well for you.
While it may be safer in the short term, I question how safe it might be in the long term? When you get used to the car and start to push the envelope and the rear end steps out, will you know how to handle it? How will you learn? I think a good drifting session is a great way to figure that out. Do it on wet pavement, low speed, in a big parking lot, but do it BEFORE it happens on the street, with other cars all around you.
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excaliber,
Ihave customer that ran a 11.4 1/4 mile. Actually he has ran this a couple times. And yes with an open rear.
Bill
__________________
Squeaky wheel always gets the grease!!
www.gcperf.com
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04-18-2010, 11:24 AM
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CC Member
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Join Date: Apr 2004
Location: Long Beach,
CA
Cobra Make, Engine: BDR #168 427W 66+K miles and counting
Posts: 338
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Not Ranked
Dinobyte: is installinng the aatuning support as easy as it looks? I have the standard suspension (not M3). I understand there are other supports out there as well, and a couple of friends have been describing home made braces for the two small unused lugs on the underside of the diff. Seems to me the aatuning support would perform a very similar function.
Thanks
__________________
Bill
"If your work speaks for itself, don't interrupt"
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04-18-2010, 12:19 PM
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CC Member
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Join Date: Feb 2010
Location: Honolulu HI, East Haddam, CT, Middletown,
HI
Cobra Make, Engine: BDR #656 402 SR TW
Posts: 179
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Not Ranked
Quote:
Originally Posted by Blittleton
excaliber,
Ihave customer that ran a 11.4 1/4 mile. Actually he has ran this a couple times. And yes with an open rear.
Bill
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Which engine did he have??
Phil
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04-18-2010, 03:52 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
Bill, 1/4 mile is a straight line. I just got home from running a road course today, very tight and twisty. You could easily spot the cars with and without LSD's. Extreme cornering lifts up the inside tire which promptly goes up in smoke. Now perhaps with the right suspension setup on a BDR body roll would be minimum, even under extreme cornering so inside wheel spin could be limited. But for road racing, I'd go with LSD every time in every car.
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