Originally Posted by Coheed 
Now here's the goods. The measurements and predictions on what this transmission can handle. Here are some pics of the transmission with the case off.
Oil baffle and gear stacks.
You can see in this pic the P11 input shaft vs the RS6 gear stacks. Notice 3rd gear on the p11 is gone?
Here is a main shaft vs main shaft pic. I kept all the pics their original size because I hate people with dial-up. Seriously though, this gives a better representation of the two gear stacks against each other.
Here is the measurement of the main shaft on the p11 transmission. about 25mm or so.
Now here is the RS6. A full 5mm larger main shaft! 30mm!
P11 on the right, RS6 on the left. You can see the extra girth given to the 6 speed transmission. The gear teeth are thicker, even though the gears aren't that much wider. But 1-3rd are much thicker gears on the RS6 transmission. 4-6th are much smaller in comparison so I wouldn't say they are a massive improvement. But the teeth are larger and the larger shafts should prevent flexing in the shafts that causes gear-spread.
Here you can see a P11 input shaft on the left vs an B13 shaft on the right.
I thought the p11 gears were the same size but I was wrong. Here you can visually see how much larger the P11 3rd gear is compared to the B13. I'd say that is pretty significant.
So bottom line, the P11 gearstack up to 3rd looks to hold safely 350whp all day with the right clutch and heavy shockproof. A big improvement to the 250-300whp from the B13 trans that people break, even at that power level. A P11 if treated right will handle 400wtq as long as wheel hop is completely avoided, but it won't do it for a long time. But then again, I don't expect the RS6 trans to keep 4th gear in it at that torque level forever. It will do better though. Probably a step over the P11, just like the P11 was a step over the B13.
So I'd say if you were building a car it looks like this:
<300wtq B13/B14
<350wtq P11/B15
<400wtq RS6
Of course the vehicle weight has a lot to do with the longevity of the transmission. Heavy cars will shorten transmission life. So an RS6 in a B13 weighing 2500lbs or less would likely last for years and years of abuse. In a P11 though at the same power levels, it may not last as long. My research has shown that very few have broken the RS6 transmission, and those guys were making over 400lb torque with a Maxima's fat ass. So obviously it didn't last. I'm sure I will be the first to break one though, since that's how we do things here lol. So You guys will be the first to know when, or if, I do!
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