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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports – this is the place to discuss making BMWs fast

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Old 02-07-2006, 06:51 PM   #1
bimmerR
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Fastest way off the line?

Whats the best way to fly off the line. Someone told me to raise it 2 4000 rpms and then just pop the clutch out right away but thats gotta be terrible for the clutch. So any advice on the best way to get your car moving?
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Old 02-07-2006, 06:55 PM   #2
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Launch it. Not too exact on what you need to do for it, but it will work. Automatic tranny = bad.
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Old 02-07-2006, 07:01 PM   #3
bimmerR
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That sh*t is like chinese to me. Elaborate a little man. Ive been driving stick for one day and im trying not to F up my clutch.
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Old 02-07-2006, 07:03 PM   #4
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why dont you learn how to drive it first and once you have the hang of it, start getting fancy.
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Old 02-07-2006, 07:04 PM   #5
///MLM
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I know how to drive stick but I have an automatic car. I\'d say first learn how to drive stick like it\'s second nature, then worry about learning and using new techniques for faster acceleration. This way, you will be careful with the car and not damage it in anyway. Last thing you want to do is screw up the tranny, clutch, etc.
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Old 02-07-2006, 07:09 PM   #6
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My bad, i didnt mean i have been driving stick for one day. I have had a stick car for one day is what i meant. I could drive it pretty well before it and am even better at it now. I dont stall, buck, and i just started rev matching wen im down shifting but im still curious on the best way to start. I do appreciate people looking out for me and my tranny, and ill definately take it easy at first, but i would still like to know the best technique for starting quick. Also, am I right about it being terrible for the clutch if you bring it up to 4000 rpms and then just pop out the clutch?
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Old 02-07-2006, 07:23 PM   #7
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I think what your buddy is trying to tell you to do is shift without your clutch. It's not that difficult to do, and it you do it right, you won't hurt anything (shifting up at least, it is much more difficult to do shifting down because your rpms are dropping).

One thing to remember is not every car can shift without the clutch at the same rpm. It is a combination of listening to your engine, pulling out of the gear and quickly shifting into the next gear while at just a slightly higher rpm.

If you want to learn how to do it, I suggest you take it slow. The easiest way is to start in a gear and slowly accelerate while GENTLY pulling/pushing the shifter to the neutral position, when you hear your car at a high rev (yeah somewhere around 4k) it sounds like the engine wants to shift...and you are applying a little pressure on the shifter, the shifter will slide out of gear. The trick is being fast enough to put it in the next gear (and take it out of the gear) without grinding.

I drive an auto now, but when I had a 5 spd, I only used my clutch to put it in 1st, and when downshifting. And I always speed shifted on my motorcycle too. Yes you can shift faster, but you also lose the high rpm range of your engine, because it has a sweet spot that it likes to shift at, and at higher rpms it gets more difficult, hope it helps.
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Old 02-07-2006, 07:41 PM   #8
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alright, trick is you want to launch and you have a manual car. i found the best way to do it on my complete stock 330 is to rev it at only 2400-2500rpm. yes it seems little, but its just enough that when you let your clutch out, your tires just spin a little bit and then you just gas it. you ultimately dont want your tires to spin too much b/c that wastes times. the less traction you have, the slower your launch.

2500rpm and let out quick, not quit a dump, but once you hear your tires starting to spin a little bit, which is should, just a little bit, then you continue by fully stepping on the petal. i can't explain it, but i can get pretty fast launches with this technique.
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Old 02-07-2006, 07:50 PM   #9
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Quote:
Originally Posted by bimmerR
Whats the best way to fly off the line. Someone told me to raise it 2 4000 rpms and then just pop the clutch out right away but thats gotta be terrible for the clutch. So any advice on the best way to get your car moving?
Notes for launching your 330xi: First, ensure proper tire pressure(on my xi I use 35/40). Don't try to launch it when the car is cold, build some heat into it first. Disable the stability control system by pressing and holding(5 sec.) the DSC button in front of the shift lever. Shift into first, keeping the clutch fully depressed. Give it about 50% throttle and lift a couple inches off the clutch; you want to catch it on the upswing around 3500-4500rpm. When you feel the clutch start to bite, ease into the trottle and smoothly disengage the clutch. If done correctly, it happens in about a second and you should be able to hear the tires chirp. If you smell clutch, you need more practice.

It's not so easy to launch a xi on dry pavement, if I were you, I would practice launching on wet surfaces first.

It will make your car a lot easier to drive if you remove your CDV and install an aftermarket clutch stop. Get to know your car better before you go savagely dropping the clutch at high rpm.
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Old 02-07-2006, 08:57 PM   #10
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with a good launch whats the 0-60 on an xi?
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Old 02-07-2006, 09:20 PM   #11
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1. Realize that clutch is a wear item.

2. Realize that *really* launching a stick car involves *really* abusing the clutch. This is why US-spec SMG M3's and M5's don't have the "launch control" feature the European cars get. If you are worried about abusing your clutch, don't bother trying to learn a max-performance launch.

3. Getting it right takes practice. Save money for a new clutch. Or practice using your friend's car

4. Don't "pop" the clutch. Bad for the entire driveline!

From a standstill, rev to ~3500. Smoothly let out the clutch while mashing the gas pedal to the floor. Use the clutch to modulate the power, letting the clutch out fast enough to keep the rear wheels right on the edge of wheelspin and the engine speed under redline. This is where it takes practice. At the dragstrip I rev to 5000 before letting out the clutch (i.e., after the last yellow light on the tree).

I've run my car at the dragstrip many times, which was helpful because they give you actual numbers that you can use to compare your technique from one launch to the next. If you watch your 60-foot times you can see how you are doing and make changes to try and improve.
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Old 02-07-2006, 09:52 PM   #12
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What about for an auto, whats the best way to launch? Is torque revving bad?
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Old 02-08-2006, 09:38 AM   #13
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Quote:
Originally Posted by slow323ci
1. Realize that clutch is a wear item.

2. Realize that *really* launching a stick car involves *really* abusing the clutch. This is why US-spec SMG M3's and M5's don't have the "launch control" feature the European cars get. If you are worried about abusing your clutch, don't bother trying to learn a max-performance launch.

3. Getting it right takes practice. Save money for a new clutch. Or practice using your friend's car

4. Don't "pop" the clutch. Bad for the entire driveline!

From a standstill, rev to ~3500. Smoothly let out the clutch while mashing the gas pedal to the floor. Use the clutch to modulate the power, letting the clutch out fast enough to keep the rear wheels right on the edge of wheelspin and the engine speed under redline. This is where it takes practice. At the dragstrip I rev to 5000 before letting out the clutch (i.e., after the last yellow light on the tree).

I've run my car at the dragstrip many times, which was helpful because they give you actual numbers that you can use to compare your technique from one launch to the next. If you watch your 60-foot times you can see how you are doing and make changes to try and improve.
Bingo!
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