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A little fun with xDrive?
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10-11-2009, 07:09 AM | #1 |
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A little fun with xDrive?
Question: Is it possible to do a standing burn-out with an xi? I was able to do it with my old 2006 325i e90 RWD (rev up to about 4500rpm then release the clutch quickly,followed by modulating the break/gas pedals)...
however, when I tried to do this with my new xi, nothing happened... the tires gripped and I accelerated very quickly off the line.. not even abit of tire chrip.. Just wondering if there is another technique to doing this with an AWD car? or is it even possible? Thanks! |
10-11-2009, 02:53 PM | #4 |
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10-11-2009, 03:03 PM | #5 |
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:laugh
in a 335xi w/ a turbo timer/tune you can easily do it when DTC is off. maybe in a 330xi but I don't think the 328's have enough torque for it... not that I've really ever tried. |
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10-11-2009, 04:58 PM | #6 |
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Just wanted to have a little fun.... after the recent rain storm; I found myself in the perfect burn-out box situation (rear wheels sitting in a light puddle, fronts on dry pavement) at a stop sign on a deserted street. So I figured I might as well try it since it's been a while since I've seen some white smoke. I guess I temporarily forgot I was driving an AWD and just went for it... wasn't until I took off with no chirping/squeeling of tires did I remember... oh.. right... Xi was designed not to do that... DOH!
but then I started wondering... is it even possible? I figured if anyone would've tried it, it would be you guys. |
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10-11-2009, 05:00 PM | #7 | |
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7/18/09- I pick up my baby- 2009 E92 335i Xdrive, Space Gray over Coral Red. Premium Pkg, Cold Weather Pkg, M-Sport Pkg, 193Ms, Gloss Black grills, Custom Gloss Black Mirrors, Performance shift and E-brake boot, M3 spoiler, Euro fog switch, gloss black interior tim, Coco-Mats (red/black), H&R coilovers, 19'' Alufelgen SF-71s......
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10-11-2009, 05:20 PM | #8 |
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It works wet or dry with MT. Your clutch will be angry with you as well as all the other downstream transfer mechanisims.
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10-11-2009, 06:05 PM | #9 |
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MT is a must but, it still really only works w/ the Twin Turbo... I can barely even get my car to churp when I launch. When I do my clutch has felt like it burnt up to a crisp afterward.
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10-11-2009, 08:52 PM | #10 |
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So I started reading up on the xDrive and how it works... looks like there are open differentials on the front and back axles and a viscous (wet) clutch pack differential in the center. Both longitudinal (front and back) and lateral (side to side) torque transfer is controlled electronically via the DSC. Where the lateral (front & rear diff) is an open diff using DSC + ABS to fake a limited slip diff to transfer power to the "wheel with grip" and the longitudinal wet clutch back is engaged by the DSC via information fed by the ABS sensors at all four corners.
That being said... shouldn't it be easy enough to cause either a lateral burn out or a longitudinal burn out as long as 2 wheels (either 2 fronts, 2 rears, or 2 sides) are on a zero/low friction surface and DSC is completely turned off? I mean, with DSC completely off there everything (all differentials) should be wide-open from a mechanical sense right? Any thoughts? |
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10-11-2009, 09:43 PM | #11 |
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yes and no
yes to the open diffs w/ dtc/dsc off but again, no because of the power issue. I dynoed at 181whp and 163wtq peak power so you have to realize you are taking those numbers and diving them by 4... not by 2 like in an "i" so essentially I'm putting down a touch less than 50whp and 40wtq per wheel which doesn't seem like its enough to get a good amount of traction loss to drift or burn out. in a 335xi, since the power is much more, you're getting close to 75-80whp/60wtq per wheel which makes it much easier... then if you add a tune like JB3 or the LET flash... almost 100/100 per wheel. If you had some bald ass tires, freshly paved blacktop and a little rain... sure you might be able to do it, but just to be able to do it from a standstill anytime you please you'll need a 335xi and most likely one with a tune. and then you also need to factor in the power transfer between the front/rear wheels because if I remember correctly, even with dtc/dsc off, the wheels still transfer POWER to the front from like 30F/70R to 50/50 if it detects a slip... I don't think that has anything to do with the traction control but more with the actual AWD system but maybe I'm wrong. I always thought dsc controlled lateral slip and dtc did traction (allowing less power to slipping wheels and more to ones with traction) but neither accounted for the % of power of fwd/rwd bias Last edited by UdubBadger; 10-12-2009 at 04:36 PM.. |
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10-12-2009, 04:13 PM | #12 |
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^ You're misusing the term, turbo timer. A turbo timer keeps an engine running to cool down the turbo(s) at idle.
You bought a relatively sluggish AWD car. You'll need some power to do an AWD burnout. |
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10-12-2009, 04:15 PM | #13 |
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10-12-2009, 04:35 PM | #15 |
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ok well enlighten me then..
tune, processor... what do you want me to call it? |
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10-12-2009, 05:37 PM | #17 |
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yeah I understand that (having a tune myself) however I was specifying that you needed the tune WITH the turbo'd engine because you can't get wheels spin with just the N52, tuned or not.
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10-13-2009, 01:17 AM | #18 |
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you could do it if you were in a MT car if you put it in reverse not fast at all but fast enough..then rev up high enough in first and droop the clutch..ive seen it done before but would never ever consider doing it myself..thats the only way i could think of it happening on a lower powered NA car..
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10-13-2009, 11:06 AM | #19 |
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10-13-2009, 08:06 PM | #20 | |
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NB: Do not do try this at home! Something will break/fail.
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