Acceleration surges coming out of a corner

[Redmond Chad]

I tried searching, but not sure what words to use - no luck with the ones I tried. I'm also not positive if this is a motor, software, suspension or tire issue (I think I know, but I hope that others not influenced by my bias will weigh in). So here goes...

I just got my R1S last week. It's on the 20" wheels with all-terrain tires. I have noticed this issue 3 times. I believe all 3 times that it happened, I was accelerating out of a corner (reasonably strong acceleration, but not full acceleration). However, it does not happen every time I accelerate out of a corner.

Basically I feel 3 quick rough "surges", as if the motor power is being turned on and off (or at least down). It's less than a second from full power to slowing down to full power again. It kind of reminds me of driving my dad's car decades ago when it was jerked while running out of gas. Then it stops and the car drives normally.

Could the computers be cutting power? Could this have something to do with all-terrain tire grip (I've never driven on ATs before)? Could something in the suspension be binding? (There are no "bad" noises, although it does seem like the motor noise varies a bit, as if power is really being varied).

Has anyone else experienced anything like this? Any thoughts on what it might be? I'll open a service ticket if it keeps happening, but I'm afraid if I do that now it will just get closed as "unable to reproduce".

Sponsored

 

[SoCal Rob]

Stability and traction control kicking in would be my guess based on ICE experience. Especially with the corner in the mix.

 

[Donald Stanfield]

Sounds like TCS kicking in and keeping you from spinning out. From what I'm reading it sounds like you're pushing it pretty good around corners and I'm betting the traction control is keeping you safe while you're doing it. I've been getting pretty good at gaming the TCS and I can get it to break loose around corners.

There's a lot of torque and HP to play with.

 

[Redmond Chad]

Thanks, that does seem like something that could explain what I felt the car do.

But I'm not sure. First, I wasn't pushing the boundaries...well, OK, I don't *think* I was pushing the boundaries, but I'm used to much smaller sport-biased cars and the R1S (especially with these tires) is a very different beast. So who knows.

If stability or traction control came on, I assume (?) there would be lights on the dash? I didn't notice any, but I will keep an eye out.

 

[SoCal Rob]

Thanks, that does seem like something that could explain what I felt the car do.

But I'm not sure. First, I wasn't pushing the boundaries...well, OK, I don't *think* I was pushing the boundaries, but I'm used to much smaller sport-biased cars and the R1S (especially with these tires) is a very different beast. So who knows.

If stability or traction control came on, I assume (?) there would be lights on the dash? I didn't notice any, but I will keep an eye out.

These vehicles feel remarkably light compared to what they weigh, at least compared to our ~1,000 pound lighter Land Rover which feels HEAVY. I bet it’s possible to exceed tire grip on the ATs in cornering, especially with the sophisticated suspension reducing body roll which probably masks some feedback you’d expect to get.

You should have the symbol at the top of this graphic flashing in yellow when it is doing its thing. I suspect it isn’t easy to see against a white background if the symbol is all yellow and it’s daytime.

It should be along the bottom of the display:

 

[Mathme]

I agree with statements above....likely it's traction control cutting power to the inside wheels in order to maintain stability. Be careful trying to push through that cutback as if things start to bounce/hop on the inside wheels, that's when $$ bits down there can break.

 

[iansriv]

Sounds like TCS kicking in and keeping you from spinning out. From what I'm reading it sounds like you're pushing it pretty good around corners and I'm betting the traction control is keeping you safe while you're doing it. I've been getting pretty good at gaming the TCS and I can get it to break loose around corners.

There's a lot of torque and HP to play with.

Video would help illustrate said "break loose" so the rest of us could live vicariously through you.

 

[Redmond Chad]

Thanks, all.

I don't offroad; I just got the 20's because they are lighter and have more tire options. I'm having Michelin Defender LTX's put on tomorrow. If this is the issue, perhaps that will reduce the frequency.

 

[ElCapiTan]

I just got my R1S last week. It's on the 20" wheels with all-terrain tires. I have noticed this issue 3 times. I believe all 3 times that it happened, I was accelerating out of a corner (reasonably strong acceleration, but not full acceleration). However, it does not happen every time I accelerate out of a corner.

I've noticed the same thing in my R1T. Does not happen every time I accelerate out of a corner but I've only seen it happen in corners. Never noticed any teletale symbols but I'm going to keep an ey out. After reading the responses the traction control kinda makes sense.

 

[DTown3011]

I'm not so sure this is the traction control doing its thing. The same thing happens to me with my R1T and it happens in all modes but moreso in Sport mode and not just in curves, but also in straightaways but ALWAYS when accelerating. It's almost like the truck "lags" for a millisecond a few times during the acceleration and the acceleration overall becomes a bit herky jerky if that makes sense. It's something I've noticed lately and while not a huge deal, my wife said something to me about it the other day so this has been top of mind and if she's noticing...its definitely a thing ha!

 

[Kunzene]

I had something similar to this happen to me today, but not out of a corner. I was actually cresting an overpass and felt the same jerking/bucking feeling. Speed fluctuated up and down 1-2 mph and it only lasted a second or two. Very odd. I have a service ticket open for driver + and ACC issues and called to add this on, though neither was engaged when it happened. There have been a couple of times before today that I thought I felt that slight surge and dismissed it, but this was noticable.

 

[mzdds]

Thanks, all.

I don't offroad; I just got the 20's because they are lighter and have more tire options. I'm having Michelin Defender LTX's put on tomorrow. If this is the issue, perhaps that will reduce the frequency.

You will love the Michelins. I switched out within days of picking up my R1S.

 

[AYAYRON]

I tried searching, but not sure what words to use - no luck with the ones I tried. I'm also not really sure if this is a motor, software, suspension or tire issue. So here goes...

I just got my R1S last week. It's on the 20" wheels with all-terrain tires. I have noticed this issue 3 times. I believe all 3 times that it happened, I was accelerating out of a corner (reasonably strong acceleration, but not full acceleration). However, it does not happen every time I accelerate out of a corner.

Basically I feel 3 quick "surges", as if the motor power is being turned on and off (or at least down). It's less than a second from full power to slowing down to full power again. It kind of reminds me of driving my dad's car decades ago when it was running out of gas. Then it stops and the car drives normally.

Could the computers be cutting power? Could this have something to do with all-terrain tire grip (I've never driven on ATs before)? Could something in the suspension be binding? (There are no "bad" noises, although it does seem like the motor noise varies a bit, as if power is really being varied).

Has anyone else experienced anything like this? Any thoughts on what it might be? I'll open a service ticket if it keeps happening, but I'm afraid if I do that now it will just get closed as "unable to reproduce".

It's 100% the truck reducing your throttle input because with stability control, happens normally, and I do believe it actually shows you on the driver's display something to that effect.

 

[AYAYRON]

I'm not so sure this is the traction control doing its thing. The same thing happens to me with my R1T and it happens in all modes but moreso in Sport mode and not just in curves, but also in straightaways but ALWAYS when accelerating. It's almost like the truck "lags" for a millisecond a few times during the acceleration and the acceleration overall becomes a bit herky jerky if that makes sense. It's something I've noticed lately and while not a huge deal, my wife said something to me about it the other day so this has been top of mind and if she's noticing...its definitely a thing ha!

I'm just guessing here, but

I guess: your tires are spinning and this is traction control where it can go from 100% to 0% 100 times a second as a reactionary measure.

I believe the OP is seeing stability control and possibly a mix of traction control where it's being proactive by reducing the throttle's maximum (which you can see on the throttle diagram during these events it lowers the max power)

 

[docwhiz]

I tried searching, but not sure what words to use - no luck with the ones I tried. I'm also not really sure if this is a motor, software, suspension or tire issue. So here goes...

I just got my R1S last week. It's on the 20" wheels with all-terrain tires. I have noticed this issue 3 times. I believe all 3 times that it happened, I was accelerating out of a corner (reasonably strong acceleration, but not full acceleration). However, it does not happen every time I accelerate out of a corner.

Basically I feel 3 quick "surges", as if the motor power is being turned on and off (or at least down). It's less than a second from full power to slowing down to full power again. It kind of reminds me of driving my dad's car decades ago when it was running out of gas. Then it stops and the car drives normally.

Could the computers be cutting power? Could this have something to do with all-terrain tire grip (I've never driven on ATs before)? Could something in the suspension be binding? (There are no "bad" noises, although it does seem like the motor noise varies a bit, as if power is really being varied).

Has anyone else experienced anything like this? Any thoughts on what it might be? I'll open a service ticket if it keeps happening, but I'm afraid if I do that now it will just get closed as "unable to reproduce".

What drive mode are you in?
Conserve mode disables some motors and could make it more likely to misbehave.
My daughter ran into a cloudburst and the car got squirrelly. Switched to snow mode.

Sponsored