Lose of acceleration over bumps - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

DriftEightSix · 09-26-2013, 09:10 AM

Hey,

Has anyone else noticed when going over bumps that you lose acceleration?
I can sit there and watch the rpm drop and the sounds of input decrease.

SloS14 · 09-26-2013, 09:18 AM

ZionsWrath · 09-26-2013, 09:18 AM

lol, is this serious?

Just think of what a bump is. The wheel is losing decreasing or even becoming disconnected with the road surface. Less traction or no traction will result in wheel spin which is increasing revs with no apparent increase or even a decrease in road speed.

Furthermore, think about going over a bump full throttle, the drive wheels leave contact with the road, the engine speed increases, and then suddenly they are again in contact with the road at a sudden increased speed.

Do you think that is good for any part of your drivetrain?

I think you shouldn't be complaining about decreased acceleration over shit roads, but rather being less aggressive with your right foot.

If you want maximum acceleration on bad roads you should look at something more rally oriented and not something like a sports car.

industrial · 09-26-2013, 09:26 AM

It's traction control going crazy. If you turned it off, you'd get some interesting wheel spin instead of power cut.

wparsons · 09-26-2013, 01:49 PM

Unless you're at WOT it's essentially impossible to hold a constant throttle input over bumps too, mostly likely you'll back off the gas accidentally.

If it's WOT, it's 99% sure to be TC cutting in as the rear wheels get light.

Boofneenee · 09-26-2013, 01:54 PM

Quote:

Originally Posted by ZionsWrath

lol, is this serious?

Just think of what a bump is. The wheel is losing decreasing or even becoming disconnected with the road surface. Less traction or no traction will result in wheel spin which is increasing revs with no apparent increase or even a decrease in road speed.

Furthermore, think about going over a bump full throttle, the drive wheels leave contact with the road, the engine speed increases, and then suddenly they are again in contact with the road at a sudden increased speed.

Do you think that is good for any part of your drivetrain?

I think you shouldn't be complaining about decreased acceleration over shit roads, but rather being less aggressive with your right foot.

If you want maximum acceleration on bad roads you should look at something more rally oriented and not something like a sports car.

you have such a charismatic and gentle way about you

projectXTR · 09-26-2013, 04:02 PM

Quote:

Originally Posted by SloS14

Nearly pissed myself xD

mush · 09-26-2013, 04:26 PM

Are u 12?

09-26-2013, 09:10 AM	#1
DriftEightSix Pegasus White Join Date: Jun 2012 Drives: 86 Location: Brisbane. Posts: 973 Thanks: 646 Thanked 126 Times in 104 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Lose of acceleration over bumps Hey, Has anyone else noticed when going over bumps that you lose acceleration? I can sit there and watch the rpm drop and the sounds of input decrease. __________________ Driving: Pegasus White Manual GTS 86.

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09-26-2013, 09:18 AM	#2
SloS14 Senior Member Join Date: Apr 2013 Drives: 2013 FR-S whiteout Location: United States Posts: 726 Thanks: 381 Thanked 652 Times in 256 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)

09-26-2013, 09:18 AM	#3
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)	lol, is this serious? Just think of what a bump is. The wheel is losing decreasing or even becoming disconnected with the road surface. Less traction or no traction will result in wheel spin which is increasing revs with no apparent increase or even a decrease in road speed. Furthermore, think about going over a bump full throttle, the drive wheels leave contact with the road, the engine speed increases, and then suddenly they are again in contact with the road at a sudden increased speed. Do you think that is good for any part of your drivetrain? I think you shouldn't be complaining about decreased acceleration over shit roads, but rather being less aggressive with your right foot. If you want maximum acceleration on bad roads you should look at something more rally oriented and not something like a sports car.

09-26-2013, 09:26 AM	#4
industrial Add lightness! Join Date: Apr 2012 Drives: 17' WRX Location: Boston Posts: 1,253 Thanks: 380 Thanked 888 Times in 411 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	It's traction control going crazy. If you turned it off, you'd get some interesting wheel spin instead of power cut.

09-26-2013, 04:26 PM	#8
mush Senior Member Join Date: Jun 2012 Drives: 2013 FRS 10 Series #81 of 2500 Location: Houston, TX Posts: 951 Thanks: 358 Thanked 395 Times in 240 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Are u 12?

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