Bump steer during high speed corner

[RedRedWyyy]

Hi ladies and gents,

Have anyone else noticed the crazy bump steer in the rear during a high speed corner? I’ve noticed that the rear move a lot if I hit a bump on the freeway while turning. Is there a way to fix / minimize that? Or is that a normal thing?


Thanks!

 

[GreenCoffee]

Comes from the damper design, large bump stops built in load up in a corner and when hitting a large dip/bump the outside corner unloads rapidly, at least this is what I think you may be talking about, talk to Redwoods Motorsports about the Ohlins dampers, they have a lot more travel and I noticed that in hard corners you are not against the bump stops and there is still travel left to deal with the bumps/dips.

Model Y Öhlins DFV Long-Stroke Coilovers - Engineered by FPSpec for Redwood Motorsports

PLEASE BE AWARE - Redwood DFV Long-Stroke Coilover kits have a typical lead-time of 2 or 3 weeks. Each kit is valved and built to order. Please contact us if you have any questions or need a rush order. Please click HERE for installation instructions Built from the ground up, we have partnered...

redwoodmotorsports.com

 

[rolling green]

Yes i've noticed this with the stock suspension and thought MPP coil overs would alleviate the issue but it has not . At least with their recommended settings, it may even be more unpredictable now. Going to try and adjust the settings and see but not sure if i need to go softer or stiffer. There's a turn with a dip on my everyday commute i can test on.

 

[RedRedWyyy]

Comes from the damper design, large bump stops built in load up in a corner and when hitting a large dip/bump the outside corner unloads rapidly, at least this is what I think you may be talking about, talk to Redwoods Motorsports about the Ohlins dampers, they have a lot more travel and I noticed that in hard corners you are not against the bump stops and there is still travel left to deal with the bumps/dips.

Model Y Öhlins DFV Long-Stroke Coilovers - Engineered by FPSpec for Redwood Motorsports

PLEASE BE AWARE - Redwood DFV Long-Stroke Coilover kits have a typical lead-time of 2 or 3 weeks. Each kit is valved and built to order. Please contact us if you have any questions or need a rush order. Please click HERE for installation instructions Built from the ground up, we have partnered...

redwoodmotorsports.com

I actually ordered it at the end of April. So we’ll see if it’ll help.
Thank you.

 

[RedRedWyyy]

Yes i've noticed this with the stock suspension and thought MPP coil overs would alleviate the issue but it has not . At least with their recommended settings, it may even be more unpredictable now. Going to try and adjust the settings and see but not sure if i need to go softer or stiffer. There's a turn with a dip on my everyday commute i can test on.

Are you lowered or running stock height with the coilovers? I wonder if it gets worse with being lowered.

 

[rolling green]

Im lowered but not much yet, waiting on wheels and alignment.

 

[tm1v2]

@rolling green I'd try setting the dampers stiffer and see if that helps. Do you have the Comfort or Sport version of the MPP's? I don't have any firsthand experience with either but I imagine the recommended Comfort settings might be a little soft for hard cornering.

On my Redwood Performance Sport Öhlins DFV, I actually prefer the stiffer settings when really driving fast over rough pavement. I think a firmer suspension is actually better for that, up to a point of course. On my M3P driving and cornering fast over dips and bumps is vastly smoother now than it was stock. I mostly use the firmer half of the adjustment range though, I haven't even bothered to try driving the car hard on the soft settings.

I think (I'm no expert) the ideal coilover setup for handling mid corner bumps would involve:

• Firm springs, to keep you off the bump stops in steady cornering (not too crazy firm of course)
• Firm low speed damping, for cornering reactions and stability (again within reason, not too firm for the application)
• A very distinct, much softer high speed damping oil route so the suspension can move quickly for bumps and sharp dips.

I think most 1 and 2 way adjustable dampers like ours are adjusting low speed damping, not high speed. So setting them firmer can be helpful for this.

I know suspension design and geometry plays a huge role too, i.e. the movement path of the wheels, but I don't think any of us are going to redesign that on our Teslas.