Smooth launch in 1st Gear?

BrianMSmith · 03-25-2010, 07:24 PM

I seem to have trouble getting a smooth rollout from a stop in 1st gear, just normal driving. My clutch either feels juddery if I let it out too slow, or I don't have the right revs and let it out too fast, resulting in the car lurching.

Any tips? Perfect RPM to roll away in 1st gear? fast or slow clutch release? Try 2nd gear?

Thanks.

Matt · 03-25-2010, 07:27 PM

Quote:

Originally Posted by BrianMSmith

I seem to have trouble getting a smooth rollout from a stop in 1st gear, just normal driving. My clutch either feels juddery if I let it out too slow, or I don't have the right revs and let it out too fast, resulting in the car lurching.

Any tips? Perfect RPM to roll away in 1st gear? fast or slow clutch release? Try 2nd gear?

Thanks.

Personally, I have to have a pretty slow clutch release to make 1st go smoothly, at least compared to other manuals I've driven.

Red370 · 03-25-2010, 07:34 PM

keep rpms steady at 1.5k, ease out until it engages, dont be too quick with it.

NCSUPACK09 · 03-25-2010, 07:39 PM

Somewhere between 1.5k and 2k gives me a nice smooth launch. Anything less and I get some "shuttering" through the clutch.

Nick911sc · 03-25-2010, 07:41 PM

Quote:

Originally Posted by NCSUPACK09

Somewhere between 1.5k and 2k gives me a nice smooth launch. Anything less and I get some "shuttering" through the clutch.

I agree. Practice Practice Practice. 1.5k-2k and you should be rolling smooooth. Keep in mind, I've noticed with this car you have to hold the clutch a little longer for it to engage compared to other cars.

Brendan@Bwalk · 03-25-2010, 07:42 PM

I do a slow tug at 1k rpm and it seems to work. The clutch in my car judders like an SOB, and I've found that not putting much of a load on it negates a lot of it.

Ironically though, slipping it at 2k rpms works well too, but I just cringe when I do that...but I'm a bit of a clutch-o-phobe. I hate slipping clutches.

6spd · 03-25-2010, 07:50 PM

As your clutch foot rises, lower your right foot. do this in synchrony and your set, i've been doing it for a long time now.

steveg78 · 03-25-2010, 07:54 PM

I've had my Z for a little of 3wks and I'm finally getting the 1st gear engagement thing to a manageable point. Do what the other guys have said...1.5-2k although I've been starting off at 1.5-1.8k...2k seems like a little too much for a casual (normal) start. Let the clutch out to the point where it starts to grip and the car starts moving and then keep it there while the car starts to roll. Once you get a little bit of momentum (this doesn't take too long maybe 10-20ft) then you can let the clutch out all the way. No lurching or neck snapping.

Nick911sc · 03-25-2010, 07:56 PM

Quote:

Originally Posted by steveg78

I've had my Z for a little of 3wks and I'm finally getting the 1st gear engagement thing to a manageable point. Do what the other guys have said...1.5-2k although I've been starting off at 1.5-1.8k...2k seems like a little too much for a casual (normal) start. Let the clutch out to the point where it starts to grip and the car starts moving and then keep it there while the car starts to roll. Once you get a little bit of momentum (this doesn't take too long maybe 10-20ft) then you can let the clutch out all the way. No lurching or neck snapping.

idk what anyone else thinks.. but that seems like a little bit of a long time to keep the clutch at the friction point..Clutch shouldn't be picking up the slack to keep the car smooth. That would end up costly.

steveg78 · 03-25-2010, 08:01 PM

Quote:

Originally Posted by Nick911sc

idk what anyone else thinks.. but that seems like a little bit of a long time to keep the clutch at the friction point..Clutch shouldn't be picking up the slack to keep the car smooth. That would end up costly.

So rolling that out at 10-20ft max would be too much on the clutch? It seems like any faster and I get the lurching. What I explained takes probably about 3seconds.

Nick911sc · 03-25-2010, 08:04 PM

Maybe just thinking about the distance online and actually doing it in the car is what is throwing me off. I could be totally wrong so take what I said as a grain of salt!

steveg78 · 03-25-2010, 08:20 PM

Hehehehe Since I'm still feeling the clutch out I'm open to any tips as well. I've just found what works now. If I could let the clutch out any sooner without lurching I would but it seems like there is a sweet spot where once you have some wheel speed, letting the clutch out is a lot smoother. If I let it out an sooner I get that lurch.

6spd · 03-25-2010, 10:13 PM

like i said above, as the left rises the right lowers, if done correctly and with experience, the motion is seamless. you wont have to hold off from letting up as the car gets rolling.

kannibul · 03-25-2010, 10:56 PM

If the clutch is brand new (ie, less than 1K on it) it'll be a bit grabby. Do a couple takeoffs in 3rd @ around 3-4K (just get the car rolling, then drop to 2nd) and it'll get some material transferred to the flywheel side and smooth things out.

My motorcycle (I know, wet clutch vs dry clutch, still same principals) had a very grabby clutch. I did that (in 2nd, 5 speed gearbox with 3 OD's), a fwe times, and that tamed it.

My (old) truck, I did a take off in 5th (of 5) and BURNED that clutch. Kind of overdid it, but it wasn't grabby, nice and smooth.

Brendan@Bwalk · 03-26-2010, 02:52 PM

Quote:

Originally Posted by Nick911sc

Maybe just thinking about the distance online and actually doing it in the car is what is throwing me off. I could be totally wrong so take what I said as a grain of salt!

On my way home last night I was thinking about this thread, and trying to see how long I was actually on the clutch. My POS juddering clutch is similar to the Z, and to make it smooth, you have to be on it for a little longer than other cars.

I had the clutch hooked up completely by time my front tires would touch the far side of a crosswalk. Only issue is IDK exactly how far that is...

If I have time today I'll see if I can take a Z out and make a video of starting it without cooking the clutch or lurching it.

03-25-2010, 07:24 PM	#1 (permalink)
BrianMSmith Enthusiast Member Join Date: Dec 2009 Location: secret Posts: 267 Drives: 370Z, Ducati 748S Rep Power: 16	Smooth launch in 1st Gear? I seem to have trouble getting a smooth rollout from a stop in 1st gear, just normal driving. My clutch either feels juddery if I let it out too slow, or I don't have the right revs and let it out too fast, resulting in the car lurching. Any tips? Perfect RPM to roll away in 1st gear? fast or slow clutch release? Try 2nd gear? Thanks.

03-25-2010, 07:34 PM	#3 (permalink)
Red370 A True Z Fanatic Join Date: Jul 2009 Location: Kaiserslautern, Germany Posts: 4,391 Drives: your mom to church Rep Power: 296	keep rpms steady at 1.5k, ease out until it engages, dont be too quick with it. __________________ 2011 Mustang 5.0 \| 3.55's \| Lethal Performance off road H-Pipe \| Magnaflow Muffler Delete \| JLT CAI/Bama tuned 417whp/ 404 ft/lbs

03-25-2010, 07:39 PM	#4 (permalink)
NCSUPACK09 Enthusiast Member Join Date: Jan 2010 Location: Somewhere Posts: 407 Drives: '10 370Z MB 6MT SP Rep Power: 15	Somewhere between 1.5k and 2k gives me a nice smooth launch. Anything less and I get some "shuttering" through the clutch. __________________ 2010 Base 370z Magnetic Black 6MT SP Mods: Bone Stock

03-25-2010, 07:42 PM	#6 (permalink)
Brendan@Bwalk Supporting Nissan Dealer Join Date: Mar 2010 Location: Redwood City, CA Posts: 56 Drives: Unreliable V8 Rep Power: 15	I do a slow tug at 1k rpm and it seems to work. The clutch in my car judders like an SOB, and I've found that not putting much of a load on it negates a lot of it. Ironically though, slipping it at 2k rpms works well too, but I just cringe when I do that...but I'm a bit of a clutch-o-phobe. I hate slipping clutches. __________________ Brendan Dolan Internet Sales Boardwalk Nissan Check out my current 370Z inventory! Check out my Nissan Leaf Blog and help me pad the analytics with unique visitors...

03-25-2010, 07:50 PM	#7 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 25	As your clutch foot rises, lower your right foot. do this in synchrony and your set, i've been doing it for a long time now. __________________ -Jay- jonathanjamesphotographer.com

03-25-2010, 07:54 PM	#8 (permalink)
steveg78 Track Member Join Date: Apr 2009 Location: MD Posts: 569 Drives: 09 370Z PG M6 +Sport Rep Power: 17	I've had my Z for a little of 3wks and I'm finally getting the 1st gear engagement thing to a manageable point. Do what the other guys have said...1.5-2k although I've been starting off at 1.5-1.8k...2k seems like a little too much for a casual (normal) start. Let the clutch out to the point where it starts to grip and the car starts moving and then keep it there while the car starts to roll. Once you get a little bit of momentum (this doesn't take too long maybe 10-20ft) then you can let the clutch out all the way. No lurching or neck snapping.

03-25-2010, 08:04 PM	#11 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 20	Maybe just thinking about the distance online and actually doing it in the car is what is throwing me off. I could be totally wrong so take what I said as a grain of salt!

03-25-2010, 08:20 PM	#12 (permalink)
steveg78 Track Member Join Date: Apr 2009 Location: MD Posts: 569 Drives: 09 370Z PG M6 +Sport Rep Power: 17	Hehehehe Since I'm still feeling the clutch out I'm open to any tips as well. I've just found what works now. If I could let the clutch out any sooner without lurching I would but it seems like there is a sweet spot where once you have some wheel speed, letting the clutch out is a lot smoother. If I let it out an sooner I get that lurch.

03-25-2010, 10:13 PM	#13 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 25	like i said above, as the left rises the right lowers, if done correctly and with experience, the motion is seamless. you wont have to hold off from letting up as the car gets rolling. __________________ -Jay- jonathanjamesphotographer.com

03-25-2010, 10:56 PM	#14 (permalink)
kannibul A True Z Fanatic Join Date: Jun 2009 Location: Jenks, OK Posts: 2,281 Drives: 370z Touring/Sport Rep Power: 267	If the clutch is brand new (ie, less than 1K on it) it'll be a bit grabby. Do a couple takeoffs in 3rd @ around 3-4K (just get the car rolling, then drop to 2nd) and it'll get some material transferred to the flywheel side and smooth things out. My motorcycle (I know, wet clutch vs dry clutch, still same principals) had a very grabby clutch. I did that (in 2nd, 5 speed gearbox with 3 OD's), a fwe times, and that tamed it. My (old) truck, I did a take off in 5th (of 5) and BURNED that clutch. Kind of overdid it, but it wasn't grabby, nice and smooth.

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