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      03-30-2013, 06:13 PM   #1
Jurmz
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Aftermarket Driveshaft Interest

Hi guys,

I work with a startup located here in Southern California called Thorough Concepts, and we are trying to gauge interest in the community for aftermarket driveshafts for BMWs.

Michael Essa just installed a Thorough Concepts Aluminum 1-piece driveshaft on his FormulaD E46 that he's building for the 2013 season, and we would like to know if the E90 community would be interested in such a product.

We offer steel and aluminum 1-piece driveshafts. Our steel driveshaft would be about 4-5 lbs lighter than stock and cost ~$300-350, while our aluminum driveshaft would be about 9 lbs lighter and cost ~$400-450. As these driveshafts are able to hold up for FormulaD, they are very strong and would not need to be replaced unless damaged in an accident.

Please let us know if you would be interested in such a product, or of any questions or comments you have.

Thanks
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      03-30-2013, 06:18 PM   #2
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good for 800-900 whp?
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      03-30-2013, 06:48 PM   #3
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Interested.
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      03-30-2013, 06:52 PM   #4
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      03-31-2013, 12:35 AM   #5
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      03-31-2013, 12:57 AM   #6
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What are the benefits of a lighter driveshaft?
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      03-31-2013, 02:30 AM   #7
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Quote:
Originally Posted by SfValley335i View Post
What are the benefits of a lighter driveshaft?
You just answered your own question, haha. Less rotational mass too maybe? 9lbs for that price isn't too bad, just don't know if I would even notice the difference because you are shaving weight off the very bottom of the car. Cool idea though. Group buy I would be in!
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      03-31-2013, 02:39 AM   #8
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Very interested in this!
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      03-31-2013, 04:31 AM   #9
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I wld be also!
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      03-31-2013, 04:48 AM   #10
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Can you make a hybrid drive shaft to fit 335i gearbox output and m3 diff input?

That would substantially simplify fitting an m3 diff!!
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      03-31-2013, 06:34 AM   #11
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Quote:
Originally Posted by phil200tdi View Post
Can you make a hybrid drive shaft to fit 335i gearbox output and m3 diff input?

That would substantially simplify fitting an m3 diff!!
+2!

What about a cf driveshaft?
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      03-31-2013, 06:59 AM   #12
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Quote:
Originally Posted by turb0mike
Quote:
Originally Posted by SfValley335i View Post
What are the benefits of a lighter driveshaft?
You just answered your own question, haha. Less rotational mass too maybe? 9lbs for that price isn't too bad, just don't know if I would even notice the difference because you are shaving weight off the very bottom of the car. Cool idea though. Group buy I would be in!
I don't think it matters that you lost 9lbs at the bottom, front or back of the car. I think the point is that like any other moving part that transfers power to wheels there will be less parasitic loss.

So, instead of say, 15% loss to whp, with less rotational mass you might actually save 3% and now only lose 12%. This translates to more whp.

At least, this is how I understand it.
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      03-31-2013, 08:02 AM   #13
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I'd be interested in the aluminum shaft. What is the likelihood this will be produced?
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      03-31-2013, 08:16 AM   #14
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+1
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      03-31-2013, 11:04 AM   #15
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Driveshaft

I had a 5.0 and a Cobra (back in the day) with the light weight drive-shaft never saw a gain on the dyno but it has to help acceleration b/c of the weight reduction. I'm not knocking it as I'm interested in one myself! Toyota puts them in their Tundrasso i'm in!
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      03-31-2013, 11:08 AM   #16
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Also interested...
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      03-31-2013, 11:31 AM   #17
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Quote:
Originally Posted by 07tundra View Post
I had a 5.0 and a Cobra (back in the day) with the light weight drive-shaft never saw a gain on the dyno but it has to help acceleration b/c of the weight reduction. I'm not knocking it as I'm interested in one myself! Toyota puts them in their Tundrasso i'm in!
You probably didn't see any dyno results because in order to go from a steel ds to an aluminum one, the diameter would have to increase to keep the same or greater strength. And since larger diameter cylinders have more mass located further from the centerline, it takes more torque to get them going and up to speed.

The main gain with an aluminum driveshafts is to keep weight off while designing for higher torque loads.

On topic though, I would be very interested to see a driveshaft for the 335 6mt that would mate with the M3 diff!!!
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      03-31-2013, 02:07 PM   #18
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Im in...
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      03-31-2013, 02:45 PM   #19
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Quote:
Originally Posted by smi1gj View Post
good for 800-900 whp?
Yes, our 3 inch diameter steel diveshafts or 3.5 inch aluminum driveshafts will handle that. We haven't finalized pricing for our high hp driveshafts, but it shouldn't be much more, if at all.

Quote:
Originally Posted by phil200tdi View Post
Can you make a hybrid drive shaft to fit 335i gearbox output and m3 diff input?

That would substantially simplify fitting an m3 diff!!
This is an interesting possibility, and we will look into this and get back to you guys on that.

Quote:
Originally Posted by DR-JEKL View Post
+2!

What about a cf driveshaft?
We currently do not manufacture cf driveshafts, but we may in the future if we feel that the demand is large enough.

Quote:
Originally Posted by NEVER ENUF View Post
I'd be interested in the aluminum shaft. What is the likelihood this will be produced?
We can manufacture these right now. We are still trying to finish up our website and get it online, but if you email me at jeremy@thoroughconcepts.com I could send you an invoice and get you set up.

Thanks for all your input guys! We are really excited to offer our products to the E90 community and will update you more as we go along. Feel free to add any more questions or comments you may have.
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      03-31-2013, 03:31 PM   #20
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Jurmz

What would be the clear benefits in going with your DS?

I read the other opinions of the other members but would like to hear exactly what you know and think.

Because I would be interested as well.
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      03-31-2013, 04:58 PM   #21
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Quote:
Originally Posted by pwr hungry View Post
You probably didn't see any dyno results because in order to go from a steel ds to an aluminum one, the diameter would have to increase to keep the same or greater strength. And since larger diameter cylinders have more mass located further from the centerline, it takes more torque to get them going and up to speed.

The main gain with an aluminum driveshafts is to keep weight off while designing for higher torque loads.

On topic though, I would be very interested to see a driveshaft for the 335 6mt that would mate with the M3 diff!!!
You're a genius!
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      03-31-2013, 05:20 PM   #22
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What about the XI's?
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