Smoother shifts while redlining?

ChipsWithDips · 02-21-2012, 03:42 PM

Do you mean a jolt forward when you re-engage the clutch, because the revs haven't had time to come down? If you want to get rid of that, get a lighter flywheel.

Or do you mean jolt in the shifter because your synchros are crying.

wdkwang · 02-21-2012, 03:44 PM

guess next mod will be jwt's lightweight flywheel or perhaps nst pulley kit

kenchan · 02-21-2012, 03:46 PM

the jolt-less wot will net you slower acceleration time vs power shifting because you have to wait for the fly wheel to spin down for the next gear.

if you're drag racing you'll want minimum shift time so in this case you will get a jolt (and some nice tire chirp).

Jeffblue · 02-21-2012, 03:46 PM

Quote:

Originally Posted by wdkwang

icic. i was just watching some pro track videos. these guys are straight up racing but the jolt doesn't seem very apparent with the in-car cameras.

@kenchan u know what i mean lawl. i know my technique isn't perfect but everyone notices how first gear engages a bit slow compared to other cars. i don't even understand why

Quote:

Originally Posted by wdkwang

guess next mod will be jwt's lightweight flywheel or perhaps nst pulley kit

lighter flywheel is a great mod for an NA car your time between shifts will be greatly decreased

Jeffblue · 02-21-2012, 03:48 PM

Quote:

Originally Posted by kenchan

the jolt-less wot will net you slower acceleration time vs power shifting because you have to wait for the fly wheel to spin down for the next gear.

if you're drag racing you'll want minimum shift time so in this case you will get a jolt (and some nice tire chirp).

exactly. if you want to shift as smooth as possible (although still not that smooth) you have to wait for the revs to fall to the right spot for the next gear. the faster they fall, the sooner you can engage the next gear.... ie lightended flywheel.

kenchan · 02-21-2012, 03:49 PM

Quote:

Originally Posted by Jeffblue

exactly. if you want to shift as smooth as possible (although still not that smooth) you have to wait for the revs to fall to the right spot for the next gear. the faster they fall, the sooner you can engage the next gear.... ie lightended flywheel.

but wd will have an even harder time not stalling the car...

shadoquad · 02-21-2012, 03:53 PM

Quote:

Originally Posted by Jeffblue

lighter flywheel is a great mod for an NA car your time between shifts will be greatly decreased

flywheel is on the shadoquad long term wish list for this car.

A fellow Z owner at last year's Zdayz told me that it was by far his favorite mod in the car.

wdkwang · 02-21-2012, 03:54 PM

Quote:

Originally Posted by kenchan

but wd will have an even harder time not stalling the car...

kenchan · 02-21-2012, 03:55 PM

Quote:

Originally Posted by wdkwang

just teasing.

wdkwang · 02-21-2012, 03:58 PM

AlphaSnacks · 02-21-2012, 04:45 PM

Quote:

Originally Posted by wdkwang

I bang through the gears frequently, and power shift when I race, and get the typical jolt through each gear. I heard that there is a way to smoothly go through each gear even at redline. Is this actually possible?

Also, does anyone else feel like the stock clutch kind of engages a little slow, particularly while cruising around?

Powershifting prevents the flywheel from slowing down, you're keeping revs at redline while clutching and then the flywheel is suddenly taxed with having to immediately slow down to match the speed of the transmission due to the next gear being larger. Thus why your shifts are so rough - lift off the throttle when you're clutching.

When you redline, you have to shift fast enough to prevent your RPMs from falling too far down but not so fast that they haven't had enough time to slow down. With a close-ratio gearbox like ours, you'd have to be an extremely slow shifter to let the revs drop too far down. So just try working on lifting off the throttle during the clutching, and turning off SRM does help like Nick said - because the natural tendency of the SRM is to hang the flywheel/revs for a tiny bit, before slowing down and matching the RPM of the next gear. Remember, the SRM actually rev-matches on both the up and downshift.

02-21-2012, 03:44 PM	#17 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 20	guess next mod will be jwt's lightweight flywheel or perhaps nst pulley kit __________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

02-21-2012, 03:58 PM	#25 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 20	__________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

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02-21-2012, 03:42 PM	#16 (permalink)
ChipsWithDips Enthusiast Member Join Date: Mar 2011 Location: Austin, TX Posts: 279 Drives: '11 Gunmetal 370Z MT Rep Power: 14	Do you mean a jolt forward when you re-engage the clutch, because the revs haven't had time to come down? If you want to get rid of that, get a lighter flywheel. Or do you mean jolt in the shifter because your synchros are crying.

02-21-2012, 03:46 PM	#18 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	the jolt-less wot will net you slower acceleration time vs power shifting because you have to wait for the fly wheel to spin down for the next gear. if you're drag racing you'll want minimum shift time so in this case you will get a jolt (and some nice tire chirp).