2024 C-HR rebounds

[EatSuru]

Has anybody seen these new models exhibiting a tiny bounce when driving on a smooth road at speeds between 90 and 100 km/h? Which deteriorate with increased velocities. Identical for all models regardless of their tires.

[Darrellll]

I have not observed that my CHR MK2 Design PHEV is equipped with subpar tires, namely FALKEN, which has a commercial affiliation with Toyota. They are rumbling and loud in contrast to Michelin Sport, which offers a smoother and quieter ride; yet, the car's ride is not jarring like my last unpleasant VW Troc. Your CHR seems to be incorrect. You may need to verify the tire pressures, since they might be overinflated, and ensure that the tires are properly balanced. I would consult a tire and wheel professional for reassurance.

[EatSuru]

The tire pressure is within specifications, and the wheels have been balanced. I test drove two of the dealer's demonstration vehicles, and they had identical flaws. The term "bouncing" may be misleading; it would be more correct to state that the car(s) exhibit a little vibration between 90-110 km/hr. The tires were manufactured around 1.5 years ago, which may indicate improper storage resulting in a flat area. The tires are Bridgestone Turanza. Similarly, the other vehicles I have evaluated possess tires that were produced concurrently, all in Turkey.

From your statement, I infer that your automobile does not experience this problem.

[Darrellll]

No, absolutely not, and I am not very fond of Bridgestone tires. I installed them on my Honda and Kawasaki bikes and discarded them soon after acquisition.

My CHR PHEV Design has enhanced smoothness at higher speeds, showing no indications of instability on various road surfaces, save on really difficult terrain. The UK is plagued with potholes and deteriorated asphalt; yet, the vehicle normally manages these conditions well, despite the subpar Falken tires.  Previously, I have tested demo automobiles, and they exhibit little similarity to the current vehicle in terms of noise management, among other factors. If this persists, I recommend seeking a another dealership, unless the Turks have developed an aversion to Toyota Corp and are improperly installing or deviating from the stipulated suspension, which I find very improbable. The enigma intensifies. What is the UK market equivalent of a CHR Limited?

[keithmerc220]

These subtle vibrations may not be associated with the tires or wheels.
What is the engine size and gearbox of the Chrysler vehicle, and is it a hybrid? 

[EatSuru]

It is a 1.8-liter hybrid. In New Zealand, the Limited model ranks as the second most expensive variant of this vehicle, while the GR model is the most costly. The primary distinctions between the two are that the Limited lacks the greater horsepower 2-liter engine but has a glass roof.

[MrGreedy]

No, the ride on my new GR Sport (2.0/20” wheels) is excellent, despite the inconsistencies in UK road surfaces. I have not accumulated many kilometres so far, but I have driven the vehicle on various roads, including A roads, for almost 50 miles, and the ride is pleasant and well-damped.

[Craigbelont]

I assume that the suspension of a C-HR for the UK market will be calibrated differently from that of a C-HR for the New Zealand market. 

[Darrellll]

Somewhat peculiar My 2023 Excel Hybrid 2L had little engine vibration, but only within a certain narrow RPM range, which may have been attributable to the vehicle being new and during the break-in period; hence, some engine harshness was anticipated. Aside from that, the ride was pleasant on most highways. The new MK2 CHR Hybrid PHEV 2L is notably more refined and silent. 

[keithmerc220]

Greetings,

Thank you for elucidating that.

The 1.8 hybrids may exhibit slight vibrations at certain RPMs and loads, akin to the rates you referenced.
The vibrations originate from the drivetrain (engine + gearbox) rather than the wheels or tires. The cause may relate to the fuel, the EGR system, or a combination thereof. In the UK, some Corolla owners with the 1.8 engine feel vibrations transmitted via the accelerator pedal, which may be connected, given the drivetrains are identical to those of the C-HR.
My one recommendation to any owner is to refrain from allowing dealers to arbitrarily replace parts in an attempt to diagnose the issue, since this is likely to result in more complications rather than assistance. The optimal option is to use the highest grade fuel available, characterised by elevated octane levels and a reduced ethanol content.  

A further cause of subtle vibrations at these specific speeds is often attributed to the suspension system. Typically occurs when operating a vehicle in strong winds or on poor road conditions. The occurrence transpires specifically at around 60 mph; it does not manifest at speeds of 50 or 70 mph.
All these instances might manifest in both ancient and brand new vehicles.  
 

The third potential cause of tiny vibrations at these speeds is attributed to the operation of the hybrid system's transaxle type.
 At velocities of approximately 60 mph, or in certain models, 65-70 mph, when the vehicle is unable to sustain electric vehicle mode and transitions to petrol, the engine operates under minimal load, maintaining an RPM of 1000. At this juncture, vibrations may arise from the gearbox and planetary gear set, which rotate at varying speeds and directions. These vibrations cannot be mitigated by the engine mounts and are perceptible throughout the vehicle's structure, particularly on the acceler
All these instances are feasible with Generation 3, Generation 4, and Generation 5 1.8 hybrids equipped with 2ZR-FXE engines. 

[EatSuru]

I have traversed the same section of freeway in a recent model Corolla hybrid without encountering the troubles I am now facing. The tires, produced in April of the previous year in Turkey, may have been improperly stored, perhaps resulting in flat spotting. I will attempt to persuade the dealer to replace the tires with a different brand, produced more recently and sourced from another nation, and observe the outcome. I will document the findings after this has transpired.