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  #1 (permalink)  
Old 03-29-2010, 05:42 AM
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Default BDR rear end opinions please (BDR owners)

Hi all,

I am very close to buying a BDR, which I am very excited about. I am working out the options that I want/need at this time.

I will be going with the Roush 427 sr/tw aprox. 515 hp & 525 ft. lbs
either a T56 or T600 tranny.

My big question is which rear end to use. I am hoping to get the advice and opinions from BDR owners who have experience with this car.

Should I go with a LSD or the standard rear end and if you don't mind, please give me your thoughts as to why.

Thank you very much!
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  #2 (permalink)  
Old 03-29-2010, 07:03 AM
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I'm not up on BDR options and what they offer but if the choice is open or LSD, always go with with LSD in these cars. That's my opinion anyway.
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  #3 (permalink)  
Old 03-29-2010, 07:08 AM
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Depends on what you plan to do with it. Street use or racing? LSD is great for burnouts and traction, I have an open diff with 3:46 gears and I don't have any problems.
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  #4 (permalink)  
Old 03-29-2010, 07:12 AM
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Gimme a break! Is there something special about a BMW open diff that makes it superior to any other open diff? No, there isn't. You might as well say, Ford or Chevy owners only please, it would make no difference in the out come. Open diff is open diff, load one tire and the other one goes up in smoke, end of story. That is the fundamental reason ALL manufacturers offer an LSD of some kind, it is superior when it comes to traction under various conditions.

Yes I've seen the "blah blah blah" about how "special" BDR's are and that an open diff works well. Uh huh, do they offer a bridge for sale with that line as well?
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Old 03-29-2010, 07:56 AM
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Dang Ex, go have a coffee man.
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  #6 (permalink)  
Old 03-29-2010, 07:58 AM
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Or perhaps drive a BDR, unless you already have...
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Old 03-29-2010, 08:00 AM
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Default Hey there

I have a Roush 427SR/TW with an LSD 3.64 diff... Perfect combo !!
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  #8 (permalink)  
Old 03-29-2010, 08:28 AM
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Well I have read the little ditty about how BDR (BMW) open diff's are "OK" and that always did bother me. Such statements coming from the FACTORY are pure BS and miss leading the public about the virtues of an LSD vs Open diff. I think it's irresponsible on a factory level.

Sure, they are "OK", just like Ford or Volvo or Chevy or anybody else that runs an open diff. BMW's are not superior with their open diff, it's simple physics.
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Old 03-29-2010, 08:37 AM
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Ernie,
For a minute, think outside the box and tell us why a non-LSD diff. could be safer. Just give it a shot for sh!ts and giggles... I always like to completely explore the other sides opinion to ensure I've got it "right" on my side.
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Old 03-29-2010, 08:44 AM
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CharlandK

Are you aware of another MA resident attempting to register his Cobra :

I can't stand Ma. As my car nears completion I now facing the real possibility I may

Might be of assistance to him if he knew the procedural steps you will be using for registering ?

Other, are you by any chance related to Rene Charland, past NASCAR Modified champ who lived in Western MA, mechanic/crew chief was Fred Rosner. We went to the races at Norwood MA ( high banked paved oval ), Stafford Springs, Utica-Rome & Fonda NY ( dirt tracks ) etc
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Old 03-29-2010, 08:48 AM
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There is no question an open diff is SAFER!! From "back in the day" I recall the law suits GM encountered over the use of LSD in their cars when it first became readily available. People weren't used to have both rear tires turning and thus making the rear end of the car go sideways. Especially noticeable on a snow covered road.

It's a Cobra, if you want "safe" try the Volvo.

I LIVE to get-r-sideways!

Last edited by Excaliber; 03-29-2010 at 08:51 AM..
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Old 03-29-2010, 09:04 AM
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Hi Don,

I have talked to the owner of that Kirkham who lives in Mass also. Whe have talked on here and on the phone. He is right. Mass sucks! I am not going to register my car in Mass. At this time, they just wont allow it. I hate it, but it is just the way it is. I hope they can change the rules some time soon and then I will transfer the registration to Mass.

I am not related to Rene. I live in Western Mass also, but we are not related.
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Old 03-29-2010, 09:18 AM
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Cashburn is obviously very knowledgeable about the BDR, I would probably take his recommendation and go with it.
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Old 03-29-2010, 09:28 AM
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Thanks rodknock.

I agree with you 100% cashburn seems very knowledgable. I was looking between 3 different manufacturers when I met him and began my discussions with him. Aside from the car itself, he is the reason that I am going with the BDR. He seems like a decent and honest guy who knows his Sh!t.

If anyone is looking to get a BDR or just trying to narrow down the options, I would highly recommend they give him a call. I can be a bit picky and a pain in the ass when it comes to getting what I want and exactly how I want it. He and I have been in discussion for well over a month now and he is always quick to respond to any of my questions. I am especially impressed with his concern for his car owners safety. It would have been much easier for him to just tell me "yes, go with the LSD" and not give me the time to explain why he feels the standard rear end would be a safer option for me even though it is a less expensive option (money out of his pocket).
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Old 03-29-2010, 09:39 AM
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Oh, OK, I didn't realize we were talking about relative safety aspects of a replica and open diff. New owner, new to Cobras, short wheel base, big horse power? Agreed, you can make a case for an open diff, just might save your ass in a corner when you shift to second and break the tires loose and weren't even trying to do that!

That's a fairly common happening with a new Cobra owner, "I wasn't even going that fast, just a mild shift into second, in the corner, at an intersection, not heavy on the throttle at all. Next thing I know, I've stuffed the car into the curb, bent the front wheel, cracked the body." Last guy I talked to about that said it cost him about $3,000 for the damage (and DON'T tell his wife).

Personally, I like to "drift" the corners...

Last edited by Excaliber; 03-29-2010 at 09:41 AM..
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