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Upshifting

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Old Sep 16, 2006 | 07:18 AM
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Default Upshifting

Yes yes another shifting question from a noob.

The concern I have is when shifting from 1st to 2nd. In order to have a smooth transition, the idea seems to be you have to rev match your upshifts so that the rpms fall to the correct range for the next gear. However from 1st to 2nd in daily driving, I have to let it drop a little bit over 1,000 rpms before letting go of the clutch for it to be smooth. I usually have to wait almost a second for it to drop to the correct rpm before I can get back on the gas which seems kind of slow. Is this normal? I usually shift around 3500 to 4000 rpm for daily driving.
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Old Sep 16, 2006 | 08:44 AM
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Typically there's no rev-matching on upshift. Push in the clutch, shift up, let go of the clutch. I rev match my downshifts though.
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Old Sep 16, 2006 | 08:49 AM
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Rev match the upshifts!? Just put the clutch in the same moment while having released the throttle in 1st gear, revs drop very quickly to ilde, put it in 2nd, while almost having released the clutch hit the throttle again! Revs drop very quickly on mine after pushing the clutch, so revs are back to ilde in the blink of an eye... No probs here... Seems you have a problem that the revs don't drop very quickly after engaging the clutch???
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Old Sep 16, 2006 | 08:56 AM
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Seems like people are too anal about all of this.. Its a car just drive it like its a normal car. Shift to 2nd when you need it and dont worry about rev matching anything.
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Old Sep 16, 2006 | 09:32 AM
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Originally Posted by SpeedxRacer,Sep 16 2006, 08:56 AM
Seems like people are too anal about all of this.. Its a car just drive it like its a normal car. Shift to 2nd when you need it and dont worry about rev matching anything.
Yes to me it seems the rpm drops too slowly. I find that when i'm done shifting and let go of the clutch, the car seems to lunge a bit because my rpms are too high.
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Old Sep 16, 2006 | 10:13 AM
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Try releasing the clutch a little slower.
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Old Sep 16, 2006 | 10:56 AM
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I feel that it's just your habit of timing -- which should apply to all manual transmission cars.

Sounds like your right foot is still on the gas when you are putting the clutch in; let go of your right foot a little earlier. You shouldn't have to ride the clutch when you are just shifting up. You should be able to let go of your left foot pretty quickly (i.e. not to the point where you are dumping the clutch like you do on a drag strip, but fast enough that you don't need to pay attention to your left foot) and still get a smooth shift.

This car has close gear ratios and a relatively light flywheel compared to the ones in most cars out there. If anything, you should be shifting a little quicker in the S2000 than in other cars.

Fortunately, cars in general have their gears, clutch, shifter and flywheel designed properly. You shouldn't have to purposely shift faster or slower. The gear ratios, shifter's throw, clutch travel and flywheel weight (momentum/inertia???) should allow all these parts "synchronize" properly without having you to "think" about the shifting, so that you are spending your efforts on the road conditions.

Anyway ... try letting go of the gas a little earlier, and see how it works out for ya.
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Old Sep 16, 2006 | 11:42 AM
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I typically shift up at 5000-5500 rpms. I find the engine to be too gutless at lower RPM's. Maybe try holding the lower gears a little longer and see how it feels.
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Old Sep 16, 2006 | 12:20 PM
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I feel like rpms drop a bit slow in my car as well. And yes, I rev-match on upshifting.

When shifting from 1st to 2nd at 4k rpm, i think the rpm needs to drop to around 2400 to match. Takes my car over a second to do it.

If you want an easier/smoother shift, shifting at 5k+ rpm.
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Old Sep 16, 2006 | 12:26 PM
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Another 2 options, get a lightened flywheel, then your rpm's will drop and you can shift as fast as you want just about!

Or, double clutch going 1 - 2. Clutch in, shift to nuetral, clutch out, clutch in, shift to 2nd, clutch out. Or if that's too slow for you, skit the clutch on the 1-N part of the shift.
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