UPDATED: Replacing Rear Shocks: Reducing the rear end bounce.

[Lb8403]

There are many manufactures that list their tires as EV ready but are not actually EV specific tires. There are several manufacturers now that make EV specific tires which have a lower rolling resistance, are quieter and have a smoother ride. Several members here have been using them with positive feedback.

Pirelli is the only manufacturer I know of at this time that make an Ultra High Performance Summer tire and Ultra High Performance All Season tire that are EV specific. Pirelli also make many other P Zero tires that are not. You have to know which ones to choose. They are usually ones designed and made specifically for manufacturers of EV’s like Porsche, BMW and Mercedes. These are the ones I’ve been testing. They aren’t cheap but the are really good. Unfortunately they are only made in specific sizes for those manufactures however some of those sizes do fit the Mach-E GT wheels like the 255/45/20 size.

Another member I’ve been talking to recently just bought new wheels and the same Pirelli P Zero All Season EV tires I’ve recently installed and will be getting them installed next week. Looking forward to his photos and review in this thread: https://www.macheforum.com/site/thr...wheel-and-tire-information-and-pictures.7258/

I’m on a plane to San Diego right now and will be back Monday to continue working on this rear shock project. I have a few more shocks coming in for fitment and Lee is going to help out with some of the testing. I’ll be sending some shocks down to him next week. Lots going on…… Stay tuned. ?

Been eyeing the Pzeros and the Hankook iON evo AS.

Anyone try the hankook ones?

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[azerik]

Take a look at the tire threads? There's plenty of info in them. This one was supposed to be about shocks.

 

[markboris]

I went with PS4s on my first Mach-e and was extremely unhappy. They have a stiff sidewall for cornering but they made the ride absolutely savage. Like to the point where I thought I might have to take rear seat passengers to the hospital for neck and back injuries. I know a lot of people think the ride can't possibly get worse, but the stock primacies are masking some really poor suspension tuning.

I agree with you Joe. Even though the PS4S's are about the best grippy handling tire out there, they can be very harsh riding and noisy. However that is if you buy the generic PS4S. I don't buy those. I buy ones that have been jointly developed between Michelin and the auto manufacturers for a specific intended purpose. You can buy PS4S's for a HP sports car or for a luxury car. The PS4S's I run in the summer on the Mach-E are designed for the Porsche Panamera Turbo S. It is a much more refined tire than the generic one with a softer sidewall for less harshness and acoustic foam inside the tire to keep them quieter. It is like the Pirelli P Zero All Seasons I am running now for my winter tires. They are not just any P Zero All seasons, they are EV specific designed for the BMW i7. These have lower rolling resistance, are smoother riding and less noisy the the generic P Zero A/S.

Pirelli as well as Michelin, make over 30 variations of the P Zero and PS4S tire all custom developed for the specific needs of the model car the manufacturer wants. The PS4S tires that came on my GT500 were not the typical generic ones. They were developed by Michelin to Ford's specs for that car. They have an FP on the sidewall (Ford Performance). They also have a softer sidewall and acoustic foam inside the tires.

The bottom line though, no matter what PS4S tire you get, they will be a harsher, noisier tire than Pirelli's rival P Zero or any all season tire.

 

[markboris]

Take a look at the tire threads? There's plenty of info in them. This one was supposed to be about shocks.

Agree Erik. I've been posting replies to questions asked here about tires and should move it over to the tire threads. However, this thread is about smoothing out the ride and while the shocks are the main focus here, tires do have a lot to do with the ride quality. I will also get back to keeping this thread about shocks. ?

 

[azerik]

So everything was going well and riding nicely, why not throw a monkey wrench at it..
On a whim I figured I'd let some air out of the front tires after I had run them up to 40psi just to see what was going on. When I tuned the rear shocks I had all 4 set to 38. I aired the rear back down to 38 and the front down to 36.5. HUGE change in the harmonics of the car. I'm sure I could have tuned the shocks around the changes but rather than that I aired the front back up to 38. And we're back to tuned happiness. I didn't expect 1.5 psi to make that big of a change but it did. It reintroduced the harmonic bucking that I had tuned out via the shocks. I wasn't expecting this at all. Something for those who are experiencing the bucking but don't have shocks in play yet, try dropping the front or rear 1 psi at a time until you're in sync as best you can.

I'll continue putting miles on the Vikings this weekend and perform this psi test with the Koni's when that happens.

 

[sci_goat]

Completely agree, but no one makes anything to do that at this point.

Wouldn't the KW V3 coilovers be close to this though? I know it also changes the springs, but it would let one adjust the front dampening.

 

[azerik]

Wouldn't the KW V3 coilovers be close to this though? I know it also changes the springs, but it would let one adjust the front dampening.

If you want to spend $3k+ to solve a $250 problem, sure ?

 

[tuminatr]

Also, a lot more adjustments because the spring rates are different

 

[21st Century Pony]

If you want to spend $3k+ to solve a $250 problem, sure ?

Yeah the price was pretty salty but I'm very happy with my K3s, so in the end...

 

[fmtexmme]

Been eyeing the Pzeros and the Hankook iON evo AS.

Anyone try the hankook ones?

Three weeks ago I changed the 19" wheels on my '21 Premium to 18" and went with the Hankook ION evo AS tire. So far, I think there is a noticeable improvement in the ride. The bigger bumps are still pretty jarring, but it seems the smaller bumps have been smoothed out.

 

[kennethjk]

Three weeks ago I changed the 19" wheels on my '21 Premium to 18" and went with the Hankook ION evo AS tire. So far, I think there is a noticeable improvement in the ride. The bigger bumps are still pretty jarring, but it seems the smaller bumps have been smoothed out.

Reason you went with 18 over the 19”, range?

 

[HuntingPudel]

Reason you went with 18 over the 19”, range?

I’m guessing that it’s because the taller tire at the same pressure is a softer spring. ??

 

[fmtexmme]

I’m guessing that it’s because the taller tire at the same pressure is a softer spring. ??

This is the reason.

 

[azerik]

Using the tire as suspension will get you so far. It can make a big difference for sure. I have 225/55/17's on the FFE and pretty much no suspension left, but it rides nicer than the MME over the same stuff.

I was putting more miles on yesterday and upped the rebound to 17 click. It was pretty freaking amazing at 20+ mph. But annoying as all get out in a parking lot as the tires took over being the suspension. You could run over anything and just get a thwomp from the back end, pretty much noise only. Then I hit the small concrete section that leads to my kids school. I was nearly bucked out of the drivers seat. Forget the kid in the back lol. It's really a balancing act with these as we're trying to do all we can in the span of about 2 inches of shock travel. The rebound on 17, however good it is, doesn't allow the shock to extend fast enough for parking lot issues.

 

[kennethjk]

This is the reason.

I would assume handling took a hit also, am I correct?

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