transmission fluid change--much less than spec

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leo0419

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Just did my first trans fluid change at 64K, and only have a ramp for the job. I measured the fluid removed, there was only 1750 ml. But per Honda spec, should be 2110 ml for a fluid change, the difference is 360 ml, which is significant...
it could have been low to start with, or normal loss over time, don't find any leak before and after the change. So far I just replaced the amount that is removed, can't guarantee it's at the proper level (didn't try to check the overfill plug, as mentioned, only have a ramp, surface floor is not even as well ), but feel safe to do so.
 
geremyw00d said:
For me, it's always good practice to ensure the car is level when checking fluid levels to get an accurate reading.
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I think it's always a good practice to make sure the car is level when checking fluid levels to get an accurate reading. If you're looking to get a more precise fluid check or need an upgrade, you might find this 700r4 transmission for sale useful. These are reliable and could be a great fit for your setup. Make sure to check the fluid levels again after a few drives to see if there's any further loss.
 
geremyw00d said:
I think it's always a good practice to make sure the car is level when checking fluid levels to get an accurate reading. If you're looking to get a more precise fluid check or need an upgrade, you might find this 700r4 transmission for sale useful. These are reliable and could be a great fit for your setup. Make sure to check the fluid levels again after a few drives to see if there's any further loss.
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I checked out the description of the 700r4 transmission:
The 700R4 is a 4 speed automatic transmission, with a 30% overdrive in 4th gear. The 700R4 was used widely on rear-wheel drive car and truck platforms

I believe I'm safe in claiming that transmission will not work with a front-wheel drive Honda Clarity Plug-In Hybrid.
 
Its always bothered me that the gear box in the Clarity is called a transmission. I always thought of a transmission as something that would change gears or change the rotation of the input so the car would back up. The gear box in the Clarity is a set of gears that directly connect the traction motor to the front wheels. The gear are fixed and never change. If the car is moving, the traction motor is turning. Reverse is accomplished by running the traction motor in the reverse direction. The traction motor (which in reality is most like a stepping motor) can be pulsed by the computer to run at any speed 0 to about 10,000 rpm. It can run forward or backward as a motor and can be turned into a generator based on how the computer sends pulses to it.
 
bpratt said:
Its always bothered me that the gear box in the Clarity is called a transmission. I always thought of a transmission as something that would change gears or change the rotation of the input so the car would back up.
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Here’s the first paragraph from a Motor Trend article on the aforementioned 700R4 transmission. Gearbox and transmission are used interchangeably.

In the case of a Hydrostatic Transmission, gearbox would not be an appropriate substitute.

IMG_3540.webp
 
Landshark said:
Is this true while EDM is engaged?
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The only clutch in the Clarity is the one that connects the drive gears to the engine for EDM, so the traction motor is always turning when the wheels are turning. EDM doesn't mean that only the engine is turning the wheels, just that the engine is helping directly.
 
insightman said:
The only clutch in the Clarity is the one that connects the drive gears to the engine for EDM, so the traction motor is always turning when the wheels are turning. EDM doesn't mean that only the engine is turning the wheels, just that the engine is helping directly.
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Are we certain?IMG_3541.webp
 
Thanks for the correction. Because my Clarity's HV doesn't preserve all the charge I start with, I believed Engine Drive Mode used both engine and battery power.
 
insightman said:
Thanks for the correction. Because my Clarity's HV doesn't preserve all the charge I start with, I believed Engine Drive Mode used both engine and battery power.
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What led you to conclude that a decrease is SOC, while operating in HV mode, was caused by EDM using battery power?
 
bpratt said:
Its always bothered me that the gear box in the Clarity is called a transmission. I always thought of a transmission as something that would change gears or change the rotation of the input so the car would back up. The gear box in the Clarity is a set of gears that directly connect the traction motor to the front wheels. The gear are fixed and never change. If the car is moving, the traction motor is turning. Reverse is accomplished by running the traction motor in the reverse direction. The traction motor (which in reality is most like a stepping motor) can be pulsed by the computer to run at any speed 0 to about 10,000 rpm. It can run forward or backward as a motor and can be turned into a generator based on how the computer sends pulses to it.
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It is now available as a two speed at least in the CRV so that does convert it to a real transmission. See third paragraph below.
  • This configuration allows for the use of a larger and more powerful propulsion motor, which now has an increased torque output of 247 lb.-ft. (+15 lb.-ft.). It also maintains its 181 hp over a broader range of motor rpm, thereby improving response.
  • The new propulsion motor uses new high-performance magnets that, as before, are made without heavy rare-earth metals. Internally, the motor uses a multi-ring structure that helps enable a higher peak motor speed of 14,500 rpm, an improvement of 11.5%. This higher motor speed also contributes to a higher sustained top speed capability for the 2023 CR-V hybrid models (Sport and Sport Touring) of 115 mph, 28% faster than its predecessor.
  • The new side-by-side arrangement also enables the use of an additional direct-drive gearset with a new low-speed lockup clutch (deployed in CR-V only) allowing engine drive at urban speeds and supporting the ability for CR-V to tow up to 1,000 pounds, a first for the two-motor hybrid system.
  • A high-speed lockup clutch is used in both CR-V and Accord, enabling a more relaxed driving environment at highway speeds by reducing engine rpm while also contributing to the new higher continuous top speeds.
 
insightman said:
Because Honda said that HV would maintain the SOC, but didn't say EDM would maintain the SOC.
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Look at patents under b60k6/442. Engine drive mode is completely irrelevant to what the computer wishes to do, engine drive mode is nothing more than a mode of operation used to achieve a specific goal. It's kinda confusing, but terms like HV mode are kinda unhelpful. The subsets of the control logic, or "control modes" are only charge deplete, charge sustain, and SoC recovery, and there are further subdivisions of them. These are completely distinct from the models of propulsion, or drive modes, ECVT drive (hybrid drive), EV drive, and Engine drive.
Depending on what "control mode" is currently in use dictates if, when, and how each drive mode is used. For example, in SOC recovery mode both EV and engine drive mode are prohibited, and will not be used, only ECVT drive, and it will attempt to recharge the battery over a period of time.
 
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