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BMW 3-Series (E90 E92) Forum
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One for the diesel boys. Caned it Sunday
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04-16-2009, 06:05 PM | #89 | |
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I am as entitled to my opinion as anyone on here is and saw fit to post as such. Just because you disagree with it doesn't give you the right to be so damned rude in your response. I accept, having read Tony's excellent explanation, that there is a degree of skill involved. At least he chose to explain to people. In response to your statement...' You aint even been on any track in your car have you',how the hell do you know what I have and haven't done in this car or any other? Unlike you, some people don't post every detail of their driving experience on the internet, so don't be so bloody presumptuous. I shall now retire from this debate.
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04-16-2009, 06:23 PM | #90 | |
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Imagine this - your car, with standard open differential (ie. no LSD), is stationary on the line, with one wheel on greasy tarmac and the other on a very dry, grippy patch. You put the power down hard and you'll probably find that you get a fair bit of wheelspin from the wheel standing on the greasy bit of tarmac and consequently very little initial forward momentum. That's because on a open differential the power is fed to the wheel with least resistance, or in other words, least amount of grip. With an LSD, the power is fed to the wheel with the most resistance, or most grip. Given the same situation, you'll find that in this instance you have much greater initial acceleration because power is being fed to the wheel with most grip. There is the potential for much greater traction, with all the consequential benefits that entails. Under power, sometimes you can feel the torque transferring between the two sides of the rear axle as grip varies between the wheels - this is most noticeable on tarmac with considerably varying degrees of grip, or on leafy roads for example. Sometimes if the driver is very unaware, this transfer of grip can lead to a degree of fishtailing as power is being transferred, but it takes a driver of enormous stupidity to let that carry on to the point where it becomes dangerous and uncontrollable. In the vast majority of cases, a LSD just provides huge amounts of traction and raises the level of control available under cornering especially. Where on an open differential car the inside rear wheel will spin away power under a sharp corner, and therefore lose considerable forward momentum and drive, the LSD-equipped vehicle will transfer power to the outside rear wheel where there's the most grip. The rear end will probably settle a little, the line will definitely tighten, and you can power the car all the way through the corner and out the other side carrying a much higher exit speed. Under braking, an LSD on a rear-wheel drive car has no advantage whatsoever, as there is no direct drive going to the rear wheels
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04-17-2009, 02:54 AM | #91 |
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Just thought I'd point out that after several days up santa pod in my 335d and trying every possible technique DSC on/off/half on, brake boosting, manual changing and auto changing!
The quickest time I set was brake boosting to 1500rpm and letting the box change gears itself! 14.0 in std 335d An auto is easy to launch, simple as. Anyone using my technique should easily be able to set a time under 14.5 (in 335d auto) driver skill is needed to get the correct amount of traction of the line and knock the time down to 13.9/14.0 |
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04-17-2009, 03:30 AM | #93 |
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04-17-2009, 03:34 AM | #94 |
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04-17-2009, 04:57 AM | #95 | ||
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From my previous experience with ZF they do adjust their coding during the life-time of the box as normal improvements for smoothness/efficiency (I had more than a several new maps applied to my Jag). This is usually in combination with any ECU changes. Another question would be if the newer cars with ED have different coding of the ZF boxes ? Or if any adjustments are mainly done on the standard "D" mode ? So a mapped car's shift points may not be optimised to take advantage of the new power/torque curves in straight line drags. From what I have read so far, apart from modulating wheel-spin, timing the gear changes manually on the mapped cars seems to be where time is gained. Optimising your gearbox shift points would remove this ... So if I was bothered enough to go 1/4 mile hunting with a vengeance I would decrease my weight (remove all rubbish from car no matter how trivial), increase launch tractability (sticky tyres - possibly of a slightly lower circumference, PSI, LSD etc.) and have a shift pattern for my box (Electonic) that matches my engine tune. A slight aside: I had a play with my paddles last night () but I am used to a super short, switch-like quick-shift on my Escorts Type 9 manual box and the BMW's shift time when pulling a paddle seems like waiting for a bus. D.
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04-17-2009, 05:28 AM | #96 |
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My first ever Pod runs were at UK7
First attempt.........DTC on, left it in normal auto.........felt like a fast run..........15.4 or so Tried a few more runs, all with DTC on, in a mixture of auto/DS Fastest I got was 14.3 with DTC on and using the paddles in DS Its not easy to get 100% perfect, big respect to Carlos's time of 13.1 |
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04-17-2009, 06:20 AM | #97 | |||||
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Thanks Ian, your A Top geezer. Looking forward too hooking up with you again soon bud!! Quote:
No matter how i would have explained it, you woul have used it for a fightback. You wouldnt do that to tony. Quote:
I did manage 13.9@101.5 in my denzil when she was standard. Quote:
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04-17-2009, 10:45 AM | #98 |
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Fair play to you splosh....you got spirit boy and that has to be applauded.
I just cant wait to get some spare time as I got more than 2mm of rubber now lol...and it isnt 30 mph against the wind lol. You have got a knack though at getting off the line, although I did 0-60ft faster than you on my 1st ever run lol...was spinning like a mothers...remember it well looking over and thinking wtf no grip but then with more torque nor did you infact you was worst off lol. People should try it...its addictive. |
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04-17-2009, 01:56 PM | #99 | |
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I still do believe that your response was rude...questioning the validity of my right to comment with a sweeping statement that I've never had track experience. Something you cannot know! I have actually driven on the track, strangely enough. It's not all about you, so drop the paranoia. Just because we might disagree on occasions doesn't mean that it's a black and white 'fightback'. As I have stated previously, I admire your dedication to the car and to all things related to driving. If I disliked you so much that I was looking for a 'fightback' why the hell would I have invited you personally, by PM, to the Northern Meet?! Now let's put this to bed eh? Gav
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04-17-2009, 02:11 PM | #100 |
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Ok Gav,
Its in the bed. Just I find it slightly annoying that you put down a form of motorsport which you have never even tried thats all. I think you might actually enjoy it.
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04-17-2009, 02:17 PM | #101 | |
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Maybe I'll give it a go one day.
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04-17-2009, 02:49 PM | #102 |
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I had absolutely no inclination to try drag racing but once I had , I could see the attraction - I'll be doing it again.
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04-17-2009, 04:46 PM | #103 |
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04-17-2009, 06:24 PM | #105 |
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I suppose I think Santa Pod is ridiculous and then I think of trying it... then trying it again... then I suspect that it's the kind of thing that could swallow you up because you'd keep going back - "this time I'll do this quicker, change at that point" all in pursuit of the fastest possible time for one's own car.
It would be bad enough being competitive with yourself but competition with others would definitely lead to burned clutches, bald tyres, expensive upgrades... one day you look round and you're addicted. |
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04-17-2009, 06:36 PM | #106 | |
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How about we set up a 1/4 mile in the Dales next Saturday Alan?! On second thoughts, Helen is there with her Porka Turbo...so we'll give it a miss!
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04-18-2009, 04:48 AM | #108 |
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