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@throtl
 
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Join Date: Mar 2009
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901 Transmission and 3.6 VRAM

I'm in the process of finalizing a drivetrain for my '68 911L /R Inspired build.

I've got a great 3.6 VRAM motor in the garage, and am thinking that will give me plenty of power for this ultralight chassis. My only concern is the transmission choice.

I have a 915, but really did not want to modify the chassis to make it fit. I also have a g50 box, but same thing...that would require extensive chassis rework, which I'm not willing to do with such a rare car. I would like to run the factory 901 if possible....

Do any of you have experience running in this configuration? I imagine I'm just begging for trouble...

If the 3.6 is just simply too much for the 901, what is the highest power output you would comfortably go on the stock transmission? Are there any rebuilds to help strengthen the 901?

Thank you!

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Old 06-13-2015, 11:15 AM
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A friend running a race 2.2 motor in his 914/6 race car is always having transmission troubles with his 901. Another friend, who kept having engine troubles with his 2.8 clone, said he didn't have transmission troubles with his 901.

As you know, you couldn't use 1st for anything other than driving around the paddock, or getting the car rolling under light throttle. Isn't there an intermediate plate which is stronger?

But what's this about having to modify the chassis to make a 915 fit? Baloney - all you need to do is dimple a bit of sheet metal at what would be the left side rear passenger's right thigh. My '68 had run the 901. I put in a 915 with just that simple modification, made with a hammer. Many have done the same thing.

Yes, you may want to make some axle/flange changes, but all easy enough to do, and long term they will be very beneficial. Yes, you'd want to get the 915 shift tower and lever and equipment. Not a big deal. Or get the shifter from a '72. You can't be fooling anyone about originality with that 3.6 monster in there, can you?
Old 06-13-2015, 11:27 AM
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Oh, for that matter, you can get a short nose for the G50 - that's what is often done when that transmission is put into a 915.
Old 06-13-2015, 11:30 AM
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That 901 will be like a frog in a blender soon enough.
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Old 06-13-2015, 12:10 PM
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I suspect the 3.6 VRAM engine will probably be to much torque at lower to middle engine speeds for the 901, you may get away with the 915, depending on how hard you drive it. I am running 3.6/915, engine is built to develop its highest torque between 4 & 7k, this is a little easier on the trans.
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Old 06-13-2015, 04:30 PM
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Sounds like you need a nice 3.4L

Actually sounds like you need more gearbox.
Old 06-14-2015, 06:50 AM
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I have a 915 and a 3.2L and it fits fine into my 74 body. It did not require modification to the body. I understand that a G50 will not fit easily without modifying the torsion bar tube. I would definitely install the 915 because of the torque of the engine.
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Old 06-14-2015, 07:20 AM
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Doesn't the 915-3.6 combo require a special flywheel & ring gear assembly? Do the same parts even exist for the 901? Just something to consider beyond the other things mentioned. Personally I would never put a 901 against that much power.
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Old 06-14-2015, 07:24 AM
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@throtl
 
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Thanks all.

Sounds like the 915 will be the way to go.

Much appreciated!
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Old 06-14-2015, 02:09 PM
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Be sure you get a later aluminum 915 box also.

Earlier are magnesium
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Old 06-14-2015, 05:30 PM
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gearhead
 
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Quote:
Originally Posted by faverymi View Post
Be sure you get a later aluminum 915 box also.

Earlier are magnesium
Some of us prefer a mag case gearbox with the steel inserts for the bearings that keep the case from getting shagged. With a sidecover and bearing plate I consider them the best of the breed. For a 3.6, just don't get an early 7:31 version. Get a 75-77 with 8:31.

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Old 06-14-2015, 06:30 PM
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