Help! Jumpy/Uneven Acceleration - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ZackZ · 09-21-2013, 10:09 PM

Manual transmission. I notice that when I strongly accelerate in first gear, power is not 100 percent. It almost feels as though the clutch is slipping but the car only has 375 miles. Could this be traction control kicking in to prevent wheel spin

. Should I take it to my dealer? Thanks.

Gaiseric · 09-21-2013, 10:19 PM

You might just be experiencing the Torque Dip, the clutch shouldn't be slipping and i doubt its your traction control.

Bolt ons and a tune will minimize your torque dip and better tires will give you better traction, so those could be some future options for you.

andrew5826 · 09-21-2013, 10:22 PM

try rolling onto the throttle

kodyo · 09-21-2013, 10:22 PM

Without driving it myself, my guess would be synchros and gear ratio difference between 1st and other gears making it seem off.

fstlane · 09-21-2013, 11:38 PM

Quote:

Originally Posted by Gaiseric

You might just be experiencing the Torque Dip, the clutch shouldn't be slipping and i doubt its your traction control.

Bolt ons and a tune will minimize your torque dip and better tires will give you better traction, so those could be some future options for you.

I bet this is the case also. I almost took mine to the dealer after the 1st day because I swore it felt like it was running on 3 cylinders. It just took some getting used to the torque dip and learning to drive above and below it. For me the car likes to be either short shifted for normal acceleration or shifted near the top of the rpm range for spirited driving. I also noticed my car felt stronger once I got a couple thousand miles on it. I recently got an Openflash tuner which helped the torque dip a LOT. Enjoy your new car!

roddy · 09-21-2013, 11:42 PM

Next time this happens, keep an eye out for the yellow light flashing in the gauge cluster. I know in my car if I nail it from a roll in 1st gear, It breaks traction easily with the TCS turned off on sooth pavement. My money's on TCS stepping in.

mikeTee · 09-22-2013, 12:07 AM

Quote:

Originally Posted by andrew5826

try rolling onto the throttle

This. Once I did this, it helped a lot with the jumpyness.

SLEEPER WRX · 09-22-2013, 12:42 AM

Wait . . . 375 miles and your "accelerating strongly"?

Maybe think about taking it easy and doing a "break in"?!?!?

humfrz · 09-22-2013, 01:03 AM

Quote:

Originally Posted by SLEEPER WRX

Wait . . . 375 miles and your "accelerating strongly"?

Maybe think about taking it easy and doing a "break in"?!?!?

Good point about break in.

I would suggest you take it sort of easy for a few more hundreds of miles. Your car may settle down after it gets limbered up....

humfrz

ZackZ · 09-22-2013, 02:18 AM

Quote:

Originally Posted by SLEEPER WRX

Wait . . . 375 miles and your "accelerating strongly"?

Maybe think about taking it easy and doing a "break in"?!?!?

I keep it below 4,000 rpm only once in a while i step on it

ZionsWrath · 09-22-2013, 02:20 AM

o lawd jesus, not this break in shit again

As for OP it is probably just the torque dip

bkblitzed · 09-22-2013, 02:22 AM

Quote:

Originally Posted by SLEEPER WRX

Wait . . . 375 miles and your "accelerating strongly"?

Maybe think about taking it easy and doing a "break in"?!?!?

please shutup about breakins lol. No one needs another thread

jflogerzi · 09-22-2013, 01:38 PM

Quote:

Originally Posted by roddy

Next time this happens, keep an eye out for the yellow light flashing in the gauge cluster. I know in my car if I nail it from a roll in 1st gear, It breaks traction easily with the TCS turned off on sooth pavement. My money's on TCS stepping in.

+1

hamzam · 09-22-2013, 01:42 PM

the highway on-ramp that I take 99% of the time has two bumps/crack right before merging... the car is at the top of 2nd right around this time, high rpm... right around 60 mph. Before, the car's drive-train would "lash", I would hop a bit inside the car and the rear-end would hop after the lash made it's way down the to the differential. Power being embarrassingly lost and the car would disconnect from myself, the driver.

After installing the Whiteline Transmission Bushing Insert, that had all but disappeared.

The car feels VERY firm and planted now under load going over those very bumps.

Just FYI, from the factory, the car has .5" of play on the transmission mount, you are more than likely feeling this "slack" that I felt.

09-21-2013, 10:09 PM	#1
ZackZ Member Join Date: Aug 2013 Drives: '13 Scion FR-S Black 6sp man Location: Yonkers, NY Posts: 51 Thanks: 22 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Help! Jumpy/Uneven Acceleration Manual transmission. I notice that when I strongly accelerate in first gear, power is not 100 percent. It almost feels as though the clutch is slipping but the car only has 375 miles. Could this be traction control kicking in to prevent wheel spin. Should I take it to my dealer? Thanks.

09-21-2013, 11:42 PM	#6
roddy Senior Member Join Date: Apr 2012 Drives: '13 Ultramarine Location: Ontario Canada Posts: 2,243 Thanks: 1,476 Thanked 1,165 Times in 685 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Next time this happens, keep an eye out for the yellow light flashing in the gauge cluster. I know in my car if I nail it from a roll in 1st gear, It breaks traction easily with the TCS turned off on sooth pavement. My money's on TCS stepping in. __________________ no man with a good car needs to be justified...

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
acceleration thump	mid_life_crisis	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	0	09-10-2013 10:19 PM
uneven engine vibration at idle	whtchocla7e	Issues \| Warranty \| Recalls / TSB	17	08-07-2013 10:21 PM
Acceleration Lag - Intermittent	donnyk	CANADA	6	07-18-2013 12:53 AM
Acceleration Times	itdansharpe	Engine, Exhaust, Transmission	8	06-09-2013 05:25 PM
Acceleration	Axel	Other Vehicles & General Automotive Discussions	0	02-10-2010 07:56 PM

09-21-2013, 10:19 PM	#2
Gaiseric Senior Member Join Date: Oct 2012 Drives: 2012 Scion TC Location: Tampa Posts: 143 Thanks: 19 Thanked 69 Times in 36 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	You might just be experiencing the Torque Dip, the clutch shouldn't be slipping and i doubt its your traction control. Bolt ons and a tune will minimize your torque dip and better tires will give you better traction, so those could be some future options for you.

09-21-2013, 10:22 PM	#3
andrew5826 Señor Member Join Date: Jun 2013 Drives: BRZ SWP Location: BC Canada Posts: 192 Thanks: 22 Thanked 109 Times in 54 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	try rolling onto the throttle

09-21-2013, 10:22 PM	#4
kodyo Senior Member Join Date: Jan 2013 Drives: Scion FR-S Location: Los Angeles Posts: 686 Thanks: 597 Thanked 257 Times in 174 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Without driving it myself, my guess would be synchros and gear ratio difference between 1st and other gears making it seem off.

09-22-2013, 12:42 AM	#8
SLEEPER WRX Senior Member Join Date: Aug 2012 Drives: 2013 BRZ Location: San Jose Posts: 193 Thanks: 2 Thanked 134 Times in 72 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Wait . . . 375 miles and your "accelerating strongly"? Maybe think about taking it easy and doing a "break in"?!?!?

09-22-2013, 02:20 AM	#11
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	o lawd jesus, not this break in shit again As for OP it is probably just the torque dip

09-22-2013, 01:42 PM	#14
hamzam Proud dad of 2 boys :) Join Date: Jul 2013 Drives: Firestorm 6-MT Location: F-TOWN, CT Posts: 312 Thanks: 203 Thanked 313 Times in 138 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	the highway on-ramp that I take 99% of the time has two bumps/crack right before merging... the car is at the top of 2nd right around this time, high rpm... right around 60 mph. Before, the car's drive-train would "lash", I would hop a bit inside the car and the rear-end would hop after the lash made it's way down the to the differential. Power being embarrassingly lost and the car would disconnect from myself, the driver. After installing the Whiteline Transmission Bushing Insert, that had all but disappeared. The car feels VERY firm and planted now under load going over those very bumps. Just FYI, from the factory, the car has .5" of play on the transmission mount, you are more than likely feeling this "slack" that I felt.

User Name		Remember Me?
Password