M/T and idling over speed bumps - jerking - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

mstoochn · 04-28-2015, 10:10 PM

2015 Brz sport-tech m/t, this is my first m/t car so perhaps I'm just clueless.

Whenever I go over a speed bump at low speed in gear (8-15kmph) the car will be in gear and I let it creep over the speed bump, as the car goes over the speed bump the vehicle will begin to rock (in the same manner it would if you drop the clutch at low revs) but 1st gear is engaged and my foot isn't on the clutch - is this a characteristic of the car or should I be doing something different?

Tcoat · 04-28-2015, 10:26 PM

Quote:

Originally Posted by mstoochn

2015 Brz sport-tech m/t, this is my first m/t car so perhaps I'm just clueless.

Whenever I go over a speed bump at low speed in gear (8-15kmph) the car will be in gear and I let it creep over the speed bump, as the car goes over the speed bump the vehicle will begin to rock (in the same manner it would if you drop the clutch at low revs) but 1st gear is engaged and my foot isn't on the clutch - is this a characteristic of the car or should I be doing something different?

You are letting the revs drop to far and it is lugging. If taking a bump that slow clutch in just before rolling over and clutch out and accelerate like normal after you g over. Never let the revs to so low that you start to shudder, "rock" or in any other way lug the engine.

chas3wba0 · 04-28-2015, 10:40 PM

Practice more n00b

mstoochn · 04-28-2015, 10:55 PM

Quote:

Originally Posted by chas3wba0

Practice more n00b

lol thanks, figured it was just me being a noob.

extrashaky · 04-28-2015, 11:23 PM

Quote:

Originally Posted by mstoochn

lol thanks, figured it was just me being a noob.

It's not like an automatic where you can just use the brake at low speed and let the engine and transmission do the work for you. At low speed you have to work the clutch, give it some gas if necessary, coast if necessary. You don't want to lug the engine because the oil pressure will drop too low and not lubricate properly, resulting in premature wear. If you have to go so slow that your RPMs drop low enough that you're lugging, clutch in and coast instead, giving it a bump as necessary to keep yourself moving.

Xuningshen · 04-28-2015, 11:38 PM

it takes effort to go over a bump right? how much power does the car have at idle? of course it'll bog down for a second.

chas3wba0 · 04-28-2015, 11:45 PM

Yea depending on the size of the bump, you'll probably have to ride the clutch and give it a little throttle to go over smoothly. It's fun once you get the hang of it

stevesnj · 04-29-2015, 05:45 PM

2nd gear with some throttle you should be good.

04-28-2015, 10:10 PM	#1
mstoochn Member Join Date: Apr 2015 Drives: 2015 WR Blue Sport Tech BRZ Location: British Columbia Canada Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	M/T and idling over speed bumps - jerking 2015 Brz sport-tech m/t, this is my first m/t car so perhaps I'm just clueless. Whenever I go over a speed bump at low speed in gear (8-15kmph) the car will be in gear and I let it creep over the speed bump, as the car goes over the speed bump the vehicle will begin to rock (in the same manner it would if you drop the clutch at low revs) but 1st gear is engaged and my foot isn't on the clutch - is this a characteristic of the car or should I be doing something different?

04-28-2015, 10:40 PM	#3
chas3wba0 Senior Member Join Date: Jul 2013 Drives: Yes Location: Bay Area, CA Posts: 1,053 Thanks: 1,630 Thanked 813 Times in 407 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Practice more n00b __________________ "If thy pleaſure be in Underſteere, thou art Weird." - Distraxi

04-28-2015, 11:38 PM	#6
Xuningshen Senior Member Join Date: May 2014 Drives: Subaru BRZ Location: California Posts: 204 Thanks: 89 Thanked 125 Times in 62 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	it takes effort to go over a bump right? how much power does the car have at idle? of course it'll bog down for a second. __________________ 2014 WRB BRZ

04-28-2015, 11:45 PM	#7
chas3wba0 Senior Member Join Date: Jul 2013 Drives: Yes Location: Bay Area, CA Posts: 1,053 Thanks: 1,630 Thanked 813 Times in 407 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Yea depending on the size of the bump, you'll probably have to ride the clutch and give it a little throttle to go over smoothly. It's fun once you get the hang of it __________________ "If thy pleaſure be in Underſteere, thou art Weird." - Distraxi

04-29-2015, 05:45 PM	#8
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	2nd gear with some throttle you should be good. __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

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