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-   -   EPA to drop requirement for auto shut off at red lights/stops (http://www.peachparts.com/shopforum/off-topic-discussion/424897-epa-drop-requirement-auto-shut-off-red-lights-stops.html)

engatwork 05-24-2025 07:28 AM

Quote:

If the car has VVT, the wear on the starter is minimal, because the car will be started in Atkinson cycle: the compression stroke will effectively be shortened by adjusting valve timing.
Is that on all hybrid cars with VVT or just Toyota?

INSIDIOUS 05-24-2025 10:23 AM

I have some small engines with decompression for easy pull starting.

P.C. 05-24-2025 12:29 PM

Quote:

Originally Posted by Mxfrank (Post 4360528)
Well, thank goodness this is history. Now they can go back to manufacturing cars with cranks.

So do all Toyota hybrids/plug in hybrids/electrics. Noisemaker works when the car is operated below 20 mph. If the car has VVT, the wear on the starter is minimal, because the car will be started in Atkinson cycle: the compression stroke will effectively be shortened by adjusting valve timing.

Right. The CR-V has a 2 liter Atkinson cycle engine.

engatwork 05-24-2025 03:56 PM

Makes me put the CRV in higher regard than I already had if only it was not for that CVT:eek:.

Mxfrank 05-25-2025 04:47 PM

I had a CVT in my old Subaru. Maybe not as much fun as a manual, but it was never a problem. Can’t say as much for the rest of the car.

Full hybrids don’t even have conventional starters and batteries. Instead, current to the recharge generator is reversed, and it’s powered as an electric motor by the 300v traction battery. That allows the engine to spin up at RPM matched to the demand of road speed. So clever…

tbomachines 05-25-2025 08:51 PM

Quote:

Originally Posted by Mxfrank (Post 4360674)
I had a CVT in my old Subaru. Maybe not as much fun as a manual, but it was never a problem. Can’t say as much for the rest of the car.



Full hybrids don’t even have conventional starters and batteries. Instead, current to the recharge generator is reversed, and it’s powered as an electric motor by the 300v traction battery. That allows the engine to spin up at RPM matched to the demand of road speed. So clever…

My parents had an outback with the CVT that I drove quite a bit. I wasn't a fan...but I think it is something you can adjust to over time. It felt very disconnected to me because there was always more lag than I antivipated in getting to the right gear. With an auto you can at least anticipate your power vs shift points and know what happens. The rest of the car was quite good! Very comfortable, although the massive screen was annoying.

tbomachines 05-25-2025 08:56 PM

Quote:

Originally Posted by INSIDIOUS (Post 4360470)
And not just a replacement, the new one. These must cost more, so the additional cost of the first unit over it's lifetime. If they don't cost more but give 5x cranks then all the cars would have them and we would never replace a starter in the normal life of a non shutdown vehicle.

They are designed differently. Different bearings, different gear ratios, and also as someone else mentioned, often a generator doubles as a starter when current is applied. Also keep in mind auto stop start is often only active on a warm engine, much less friction. Auto stop start has been around for ages now, youd hear of horror stories about burning through starters, but you don't.

P.C. 05-27-2025 11:53 AM

Quote:

Originally Posted by tbomachines (Post 4360699)
My parents had an outback with the CVT that I drove quite a bit. I wasn't a fan...but I think it is something you can adjust to over time. It felt very disconnected to me because there was always more lag than I antivipated in getting to the right gear. With an auto you can at least anticipate your power vs shift points and know what happens. The rest of the car was quite good! Very comfortable, although the massive screen was annoying.

Honda's eCVT for the CR-V hybrid, which really isn't a true cvt, goes so far as to create a stepped approach to ratio changes under acceleration, which, if you close your eyes, almost seem like upshifts made by a geared transmission. It definitely creates a more-familiar driving feel than the regular CVT in their gas-only CRVs. I was shopping for a gas CRV EX-L when I decided to try the hybrid, and from a drivability standpoint, the hybrid was the winner, with a smoother overall driving feel, and courtesy of the electric motor backing up the Atkinson cycle 4-cylinder, better mid-range acceleration. The powertrain behaves more like a conventionally-geared small V6 than a normal 4-cylinder.

engatwork 05-27-2025 08:18 PM

Thanks for info PC. I had to google the Honda eCVT. It does not have a belt like what i would call a typical CVT. Good info to know.

Wonder how many miles it can go for? Sounds like a better design than the pure CVT.

P.C. 05-27-2025 10:37 PM

Quote:

Originally Posted by engatwork (Post 4360930)
Thanks for info PC. I had to google the Honda eCVT. It does not have a belt like what i would call a typical CVT. Good info to know.

Wonder how many miles it can go for? Sounds like a better design than the pure CVT.

It is definitely a simpler design, which bodes well for durability, but good luck finding a place outside of a Honda dealer which would have any experience in diagnosing an issue, let alone repairing it. I sprang for a manufacturer-offered 120,000 mile warranty, which I never have done before.

savas 05-28-2025 12:17 PM

Our subaru has something similar. It's a CVT with a metal chain and pulley set up with a torque converter. It also has programmed "gears" so it feels like it's shifting and can hold the gears in manual mode. The ones after 2018 seem to be pretty reliable.

Idle 06-04-2025 03:00 AM

Quote:

Originally Posted by P.C. (Post 4360493)
I have a hybrid Honda CR-V. For safety reasons, whenever it is in full battery mode, a noisemaker placed under the hood emits a strange sound that I equate to a flying saucer sound effect from some cheap '50's sci-fi movie...

When I first got the Tesla I noticed it made a weird sound but only in reverse. It turns out that all EVs, because they are so quiet, must make a warning noise in reverse.

So Tesla ditched the beep, beep , beep you hear out of big trucks and replaced the noise with that flying saucer sound.

Skid Row Joe 06-08-2025 12:43 AM

Starting and stopping an otherwise running engine isn't healthy for the engine. It produces unnecessary wear in it.

Mxfrank 06-08-2025 05:54 AM

At least we've moved beyond "it wears out the starter."

tbomachines 06-08-2025 06:42 PM

Quote:

Originally Posted by Mxfrank (Post 4361825)
At least we've moved beyond "it wears out the starter."

Yeah but nothing does the trick like a good ol carbeurator!


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