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      03-17-2013, 11:05 PM   #9
dk79
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Drives: 335i xdrive coupe, 535xi
Join Date: Feb 2013
Location: sioux falls, sd

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Quote:
Originally Posted by mykal335xi View Post
I had a g-timer, I compared it myself at the track and with the vbox, the point of that article is that they are not accurate not that they are always going to read slower. My g-timer was low, others on this site were high. They are great for tuning and testing your car against itself because they can be somewhat consistent, but not so much against other cars.

Launching in 2nd gear is not a sure bet at higher traps, I tested this thoroughly one night with over 50 runs (half of which were in 2nd gear, half in 1st) I can tell you that the traps were very close to each other. Unless you're spinning like crazy the traps should be almost the same, with the 2nd gear launch coming in .1 to .15 lower ET even with the worse 60' time. This is because the shift is ~.3s and generally 1st gear launches have .1 to .15 lower 60' time. I would HIGHLY recommend you don't launch in 2nd though, it will burn up your 2nd gear clutch packs in no time. I was the first one to do the 2nd gear launch on the XI and even at 370whp it was too much for the trans. With the Alpina trans flash, there should be no advantage to a 2nd gear launch any longer.

AWD is great, but 335xi AWD is nothing compared to GTR or the Audi system. We've got a shit-ton of weight and drag on our setup because it wasn't designed for road racing OR drag racing. X-Drive from BMW was not meant for performance, it was meant to sell cars to people that want traction in the snow

115mph traps is good for a high 11, take the rear seat and passenger seat out if you go to the strip, it's worth .1 to .15 or so (also keep fuel under 1/4 tank). 11.8 you will need to get 116-117mph traps and a < 1.6x 60' time.

thanks.
I will be trying the cobb e30 maps soon. hope that will give atleast 30-40 more awhp

I think bmw awd system is pretty solid as compared to audis. my friend had lots problems with his awd car. plus audis now have torque vectoring that causes a lot of understeer. I never heard of any awd system failing in an xdrive car or suv. also I have not seen any other car with this much tuning potential as the n54 platform.