[SexyBeast]

Any info out there about regen capability in AWD?

RWD regen is 0.13g.

In GTX/AWD, the front motor can also capture regen. But VW has not released any info about this - at least, I can’t find any.

Alex on Autos test drives AWD here and says he feels there is more regen in AWD. But no figures from VW…

 

[mochalatte]

RWD regen is 0.13g.

Point of clarification, that is the amount of off-pedal regen in B mode. In both D and B mode, the first 0.25g of deceleration when pressing the brake pedal is all regen. Kyle Conner has that and other details written in his notebook in this YouTube he did a while back. Interestingly, he says the front rotor brake diameter is 13.4 inches, but that's another thread.

 

[Stinsy]

Point of clarification, that is the amount of off-pedal regen in B mode. In both D and B mode, the first 0.25g of deceleration when pressing the brake pedal is all regen. Kyle Conner has that and other details written in his notebook in this YouTube he did a while back. Interestingly, he says the front rotor brake diameter is 13.4 inches, but that's another thread.

There is no way VW measure brake discs in inches!

 

[7S POWER]

There is no way VW measure brake discs in inches!

Or 340 mm in the real world.

That's the US ID.4 Specs.

https://media.vw.com/assets/documents/original/13028-2021ID4RWDTechSpecsFinalv3addedSteeringRatio.pdf

7S POWER

 

[7S POWER]

Interestingly, he says the front rotor brake diameter is 13.4 inches, but that's another thread.

Y it's, according to US ID.4 Specs. I'm not too convinced though. I think it's more like 356 mm (14.0") or 360mm (14.2") ø disc.

https://media.vw.com/assets/documents/original/13028-2021ID4RWDTechSpecsFinalv3addedSteeringRatio.pdf

7S POWER

 

[Stinsy]

In Europe VW offer 18” as the smallest wheels on the 52kWh models and 19” as the smallest wheels on the 77kWh models. Possibility the 77kW has bigger brakes?

 

[d287]

Funny you ask - just saw Alex on Autos drive the ID.4 and specifically called out the regen; said it felt like 2x that of the RWD. The Most Affordable AWD EV Is The New 2022 Volkswagen ...https://www.youtube.com › watch

 

[theboomr]

Point of clarification, that is the amount of off-pedal regen in B mode. In both D and B mode, the first 0.25g of deceleration when pressing the brake pedal is all regen. Kyle Conner has that and other details written in his notebook in this YouTube he did a while back. Interestingly, he says the front rotor brake diameter is 13.4 inches, but that's another thread.

I really really wish we could access the full regen just with off-pedal in B. And come to a full stop.

 

[RocketVol]

Per the Service Manual (not the parts book so it might be off):

So check the build code on the sticker under the read cargo floor to see what brake package you have. I know that FE's have the 1LN package.

John

 

[7S POWER]

I really really wish we could access the full regen just with off-pedal in B. And come to a full stop.

OPD negates Newton's 1st Law of motion. NOPD favours the NFLOM. Coasting is more efficient because it takes less energy to keep the vehicle in motion than starting from rest.
All that harvested energy will go out the window when you start the vehicle from rest.

7S POWER

 

[d287]

Okay, did a lot of driving in my new AWD Pro S today - both highway and twisty backroads. B mode is much stronger than the B mode in the RWD we test drive… almost brings it to a dead stop. It felt like it was going into “creep” mode instead of coming to a full stop - but that’s just software; hopefully they give us auto hold as an option in a future update, then it will basically be one pedal (for those who like it). I decided I like D mode better after a lot of back to back testing - it seems to dial the regen up in D mode when going down a hill or approaching traffic anyway. And the brake blending is imperceptible- much smoother than the Mach E!

 

[SexyBeast]

Okay, did a lot of driving in my new AWD Pro S today - both highway and twisty backroads. B mode is much stronger than the B mode in the RWD we test drive… almost brings it to a dead stop. It felt like it was going into “creep” mode instead of coming to a full stop - but that’s just software; hopefully they give us auto hold as an option in a future update, then it will basically be one pedal (for those who like it). I decided I like D mode better after a lot of back to back testing - it seems to dial the regen up in D mode when going down a hill or approaching traffic anyway. And the brake blending is imperceptible- much smoother than the Mach E!

Congrats on the AWD!

Just wanting to get some clarity:

-So does it regen in D mode? Did you have it in Sport Mode? As far as I understand, the vehicle will only regen in D mode if Sport mode is selected, otherwise only B mode can regen. Can you hear/feel the front motor turning on or regenning?

-And does it sense approaching traffic with camera/radar to make regen kick in stronger?

 

[d287]

I was in D and Eco mode and it regens if you go down a hill, or are approaching slower traffic; it doesn’t regen in D if you’re driving on a flat open road. It also seemed to regen a bit on very twisty roads, but that could have been my imagination- the road was too twisty to glance at the meter. It regens much more in Sport mode (still in D), and even more in B. I didn’t try B + Sport to see if that does even more. I actually tend to leave it in Eco most of the time, and it’s still plenty fast and the A/C works fine. There’s a detent in the accelerator pedal that you can push through to get non-Eco levels of power. (it feels just like the detent on the Audi Q5 PHEV when you’re in Electric mode and it’s going to kick the gas engine off if you push harder.)

 

[SexyBeast]

Thanks for clarifying. Since braking is a little more efficient at the front axle, I would really like some clarity from VW how much regen, or if any, there is at the front motor in AWD of ID4.

 

[d287]

Thanks for clarifying. Since braking is a little more efficient at the front axle, I would really like some clarity from VW how much regen, or if any, there is at the front motor in AWD of ID4.

Good question. The only thing I know is that in the Alex on Autos video where he discusses regen he says the front motor provides a lot of the enhanced regeneration because front biased braking is better.

 

[AWD Or Nothing]

The AWD regen is greater because it has two axels to brake with regen instead of one before the risk of unintended skid. The default regen amount is all about safety and not breaking the coefficient of friction in all weather conditions (without brake pedal input from the driver). VW is going to be cautious with "B" mode to not cause a skid condition on release of the accelerator in snow and ice. If you want more regen, press the brake pedal. Since you have 4 tires that can be contributing to regen braking vs two, you can better distribute the braking forces across all the tires and thus greater amount or regen can be tolerated safely. Also, the AWD cut-over threshold where brakes blend-in with regen should be different under higher braking forces. If you drive normally and not hitting the brake too hard such that friction brakes are needed on the 2WD, there should be no significant difference in regen efficiency to the AWD. If you frequently brake harder so that you end up using the friction brakes, maybe the AWD will show some efficiency benefits over 2WD.

 

[Stinsy]

...maybe the AWD will show some efficiency benefits over 2WD.

Tesla achieved this by gearing the front and back motors differently. The power goes to the motor with the correct gearing for the speed. I have looked but haven't found anything written about the gearing of the two motors in the AWD iD4.

If you're driving down a big mountain it'd be interesting to see if the AWD collects more regen power compared with the RWD.

 

[d287]

It definitely has much more regen than the RWD (based on a test drive on the same roads). Didn’t compare the negative kWh on the screen, but assume it’s putting more energy back into the pack. I guess we have a new “game” - stopping without passing the bottom of the green bar, when it engages the mechanical brakes

 

[Stinsy]

It definitely has much more regen than the RWD (based on a test drive on the same roads). Didn’t compare the negative kWh on the screen, but assume it’s putting more energy back into the pack. I guess we have a new “game” - stopping without passing the bottom of the green bar, when it engages the mechanical brakes

You want to use the mechanical brakes every once in a while otherwise they'll corrode. I looked at a few Passat PHEVs to tide me over while I waited for the iD4 to be delivered. Every one had badly corroded brake disks...

 

[d287]

Good point - and may give some credence to their story about the rear drums being more resistant to corrosion. However, it does use them every time you actually stop, below 2-3 mph since there’s no auto hold feature yet.