S2000 Under The Hood S2000 Technical and Mechanical discussions.

Best Time to Shift Into Neutral During Decel

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Old Jul 23, 2014 | 11:45 AM
  #61  
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When coming to a stop, I will only coast in neutral very near to coming to a stop (typically once RPM's get to 1.5k - 2k, and under 10-15 mph). Clutch in, shifter to N, clutch out. I never sit with the clutch depressed.

I just get a weird feeling coasting around in neutral or sitting for longer than a few seconds with the clutch depressed. It just doesn't feel right.
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Old Jul 23, 2014 | 11:59 AM
  #62  
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I was always taught to stay in gear until you've come to a stop. This habit was only reinforced after learning how to drive a truck for a previous job.

Decelerating in gear uses no gas, aids in braking, and gives you an opportunity to react if necessary. I also rev match or heel and toe just for practice sometimes.
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Old Jul 23, 2014 | 11:09 PM
  #63  
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Originally Posted by cosmomiller
It seems to me your question has been well answered.

I would just like to add something when you don't go to neutral. Don't skip gears. If you are slowing, lets say for an offramp and now you want to go from 5th to 3rd, don't skip 4 on your way to 3. With the clutch depressed run through the gears to what you want.

Originally Posted by SlowTeg' timestamp='1404826918' post='23234513
Originally Posted by cosmomiller
It seems to me your question has been well answered.

I would just like to add something when you don't go to neutral. Don't skip gears. If you are slowing, lets say for an offramp and now you want to go from 5th to 3rd, don't skip 4 on your way to 3. With the clutch depressed run through the gears to what you want.
I skip gears sometimes, but I often double clutch on the street. That should alleviate any wear.

Also, one "advantage" to engine braking (leaving the car in gear on decel) is that the injectors shut off fully. In theory, it might save some gas.. I do both..

Originally Posted by iamxpL
Try not to skip gears, I believe Billman has a thread on how users develop burrs on their gears from skip shifting.

Originally Posted by SlowTeg
Originally Posted by DrakeValle' timestamp='1405002918' post='23237795
If you want to double clutch, more power to you. You may slightly reduce the wear on your syncro's, but unless you are making your syncros work really hard, you should have to worry about wearing them out too fast.
Couple notes. I never said double clutching is necessary. How much of a benefit it provides is certainly debatable, all I was trying to say is that it should in fact help. Skip shifting or if you happen to find yourself coasting and needing to select a gear it would help. As trannys get older (especially if they've been beaten on) it'll make a noticeable difference as well.

I was merely asking Billman why double clutching is never needed.. older hondas had issues with syncros wearing out, and I'll happily change my TO bearing more often and save some wear on my tranny. If the s2k syncros are more stout with little/no syncro wear then that's a good reason to not double clutch rather than just "syncros do that work."

Originally Posted by SlowTeg
Originally Posted by arsenal' timestamp='1405004706' post='23237841
You did read the freeway part right?
Clearly man you're a bad driver, just accept it. Don't you know that you're either supposed to be on the throttle or braking at all times??

Oh wait, we're talking about the street.. There are exceptions to the rule. I guess no one has ever coasted down a big hill/mountain in neutral.. or been coasting in traffic and had to skip a gear when downshifting..

Originally Posted by DrakeValle
I used to skip shift in my DD all the time. When I got my S I stopped skip shifting because I learned that it is bad to do.
Skip shifting when downshifting is not a problem. In fact, that's the way you do it when you race.

Skip shifting when upshifting is something many cars can take, but is generally to be avoided, and to be absolutely avoided in S2000's.
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Old Jul 25, 2014 | 06:51 PM
  #64  
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If I know I'll be coming to a stop for sure I will not downshift but just brake and shift into neutral when almost coming to a complete stop. I always rev match double clutch if I know I have to get on the gas again.
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Old Jul 26, 2014 | 12:45 PM
  #65  
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Double clutching is used in non-synchronized truck transmissions because of the sheer weight of the mainshaft/clutch disc assembly.

Double clutching is a technique that has no merit or use in this car. I know it may feel right for some of you, but as far as a race car is concerned there are better and more proper ways.

Maybe a truck driver can chime in
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Old Jul 26, 2014 | 08:14 PM
  #66  
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Doesn't double clutching with rev match save wear on the syncros?
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Old Jul 26, 2014 | 09:54 PM
  #67  
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I always use engine braking. I only shift it back to neutral when almost coming to a complete stop or when the car is rolling slowly in traffic.

It preserves your brakes and since when you are in gear, you have more control over the car and the surroundings.
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Old Jul 26, 2014 | 11:29 PM
  #68  
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This thread in a nut shell:

-Double clutching = useless

-Gear braking vs neutral coast = gear braking gets better gas mileage but probably not enough to care but can be good if you need quick gas.

-Don't gear skip while advancing.

Point 3 being the most important
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Old Jul 27, 2014 | 06:25 PM
  #69  
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So double-cluthing is useless since your syncro's do the work for you. But what if your syncro's are shot from PO abuse?
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Old Jul 27, 2014 | 08:38 PM
  #70  
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Coasting and braking in neutral approaching a stop light is fine. What I normally do. Modern brakes don't need help from rowing the gears. Mostly just easier, but saves a few cycles on the clutch and synchros too. Same with skipping gears on the way up. Merge onto a highway: 1-2-3-6. Or even 1-2-6 on a power merge, since 2nd goes past 60 and 6th will do fine at that speed.

Holding the clutch pedal down uses a little bit of the life of the throwout bearing for each second you do it. Has no effect on the clutch or pressure plate.

I only double clutch on a rolling downshift to first, sometimes, when it's cold, to avoid crunching. That is probably more an old habit from competition than anything else. But double clutch is not going to do any damage either.

Oh and of course I double clutch on an "upshift to first" or "upshift to reverse" after first starting when the weather is cold. Also to avoid crunch. Sometimes just to get it into gear at all.
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