Slight right pull under acceleration

MiamiBlue

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Emira V6
I have a RHD (if it matters) and notice a slight pull to the right with medium to high acceleration. It's quite minor and I didn't realise at first, but subconsciously I think I've been adding a touch of left wheel steer to counteract with some heavy right foot. When coming off the accelerator it stops and goes back straight to how it was.

Is this a characteristic? (Little torque steer) Or do I need to investigate further? It's not causing any issues as it's so minor, just don't want to have an underlying problem.
 
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The dealer with my car has been great, they have tried alignment, tried swapping rear shocks, swapped the wheels with another car (same goodyear tyres), checked all the bushes and reported back to lotus, everything is as it should be so lotus suggest changing rear tyre brand but not sure which to try. There was a guy on one of the forums that said tyres sorted it for him so need to find him and see what he fitted. In the mean while I might have to do a track day to burn some rubber before new ones.
Keep us updated.
The tyres thing seems nonsense. If you've had the wheels and tyres from another car (that doesn't pull) on to yours with the same result. Then clearly it's the car that's different and not the tyres. I don't understand their logic here. Also suggesting you change away from LTS tyres (specifically designed for the car) to another brand seems ridiculous. At best you're possibly hiding the symptoms, not solving the issue.

After trying the obvious myself I'm trying to live with it. But when you know it's there, and shouldn't be, it's annoying!
 
For all those with issues, note there are different alignment specs per tire, and from factory, though my suspension was in tolerance it wasn't spot on. Tiny changes on this car makes a large difference in handling. Have your alignments checked.
Alignment was the first thing I did (after checking tyre pressures). I went to what should be a decent alignment place. Maybe I need to try somewhere else.

Thing is it tracks perfectly straight until you put your foot down.
I wonder if it's possible for the LSD to have an issue where it's giving more power to one wheel even when they both have grip?
 
I wonder if it's possible for the LSD to have an issue where it's giving more power to one wheel even when they both have grip?
I highly doubt that. It is a Torsen diff, mechanical, and unless there is significant loss of traction on one wheel, there won't be any lockup on the diff, and for that to happen, there needs to be enough lateral force to unload the inner wheel. On a straight line, I cannot think of a way the Torsen diff would engage at all.
 
Interesting thread. Agree with others that car is alignment sensitive.

I experienced this same thing.
Mine veered left initially under harder acceleration, or when accelerating on the motorway(60-70) and then veered back to the right when I took my foot off the accelerator. It was unnerving.

Mine was caused by wheel alignment 'like a nascar' were the words used.

I went to PJS Lotus, near Burton on Trent. Great Lotus specialist and fully recommend them.

Explained what the issues were and why the car was behaving the way it was. Change was night and day and drives straight as an arrow.

Possibly worth another try doing alignment with another specialist, if you feel it's not quite right and pulling to one side, even if slight.
 
The dealer with my car has been great, they have tried alignment, tried swapping rear shocks, swapped the wheels with another car (same goodyear tyres), checked all the bushes and reported back to lotus, everything is as it should be so lotus suggest changing rear tyre brand but not sure which to try.

Any further updates Andy?

It's really starting to annoy me.
 
Update on my car related to this issue: I have been working with my dealer on this issue, and even involved Lotus USA support team. One issue they uncovered was that the left front wheel was barely in spec for caster. The Lotus engineer asked that the front control arms' bolts to be checked. The dealer technician found that the bolts in the front lower arm were incorrect parts and were too long. Once those bolts were changed, caster became a non-issue. Of course, this does not have anything to do with the car pulling to the right; however, now we could completely rule out alignment being the issue.

As this work was done, I had the track tires (Conti ECF) on the car with 4 track days on them. They did not look much used frankly. Unfortunately, the alignment being nearly perfect, the car still pulled to the right in a way that the rear axle was push it to the right, rather than the front pulling to the right. The Lotus engineer than suggested that I either swap to stock tires or rotate the ECF tires from left to right to see if the tires were causing the issue. I chose to change to the stock Goodyears since we were in December and it was getting cold already. After this change I did not get to drive the car much, only a couple of grocery runs until about last week.

Now the ice is off the roads, I took the car out and started driving. And yes, the tires were the biggest culprit. The car is tracking straight without pulling to either side. I went back and measured thread depth of the ECF tires, and the left side tires had 1.5 mm less depth compared to the rights side. This is to be expected as I had all four track days on a track that is running clockwise with only two mild corners to the left out of total ten; the left side tires get abused significantly. Not to mention that the ECF tires are directional, so I did not swap them between left to right in between track days.

I hope this is helpful to others.
 
Remember the old WW2 planes that would roll to the left on full throttle. It’s inertia and torque. The plane would roll in the opposite direction of the high torque spinning drive shaft . Could be something like this esp in longitudinal vs transverse mounted power plants. See also top fuel drag cars.
 
I have a RHD (if it matters) and notice a slight pull to the right with medium to high acceleration. It's quite minor and I didn't realise at first, but subconsciously I think I've been adding a touch of left wheel steer to counteract with some heavy right foot. When coming off the accelerator it stops and goes back straight to how it was.

Is this a characteristic? (Little torque steer) Or do I need to investigate further? It's not causing any issues as it's so minor, just don't want to have an underlying problem.
Hi. I am having exactly the same problem as you. Have you ever solved it? What was it?
Thank you very much!
 

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