No, I don’t, Danny can’t afford me Idk anything about all answers. Are your brakes grabbing due to rusty rotors?
If a green dot is blinking in the corner of his avatar, he's on the site. Otherwise no. Regarding changing the proportion of regen versus friction brake: there's no way Toyota would make that owner customizable. It is very complex, and nearly always a mix of the two, varying amounts of each. Definitely not one or the other.
============================================================= OK, I now have a 2021 Prius Prime with 32,000 miles, after I hit a deer with my Blue 2017. I was hoping there might be a Toyota Tech adjustment of the Regen/Mechanical crossover. So then, is it a good idea to shift from D to B on a regular basic. B is usually used when going downhill and it applies more Regen. I noticed that even when on a flat road and needing to brake, I can shift from D to B and get quite a bit of Regen and not have to touch the brake pedal. Then with slight pressure on the pedal, even more Regen is achieved versus leaving the shifter in D. What are your thoughts?
the brakes need exercise to prevent rotor rust buildup, and keep the caliper slide pins from freezing up. aside from that, I think your idea is fine
The concensus is to only shift from D to B when you have a long downhill ahead, with the object being to delay it being fully charged, since B applies less regen braking.
Under typical braking, regen is used to slow the car down to approximately 7-17 mph when the front hydraulic brakes are used. Rears are slightly engaged during light braking for stability and wear faster than front pads. Hydraulic brakes are used anytime hard or emergency stops are needed. As a result normal brake pedal regen significantly extends brake pad life. My original rear pads were changed at 300,000. I changed the front pads at 345,000 miles even though they were still legal. The rotors are all original.
In a Prime or other plug-in, just make sure these actions don't spin up the ICE. If the ICE spins, then you applied too much and it is wasting energy in the ICE that otherwise could have been sent to the battery. You might need to have it set for EV mode instead of HV mode, I don't know for sure as I never had the Prius Prime, just a regular Prius followed by RAV4 Prime with different settings. In a non-plug-in Prius, this move is wasteful because it (nearly) always spins the ICE, deliberately wasting energy. Since the regular Prius has a small battery, it cannot take all the energy of serious downhills, so B mode is used to keep the brakes from overheating. This eventually may happen in a Prime too, when it reaches full or charge rate & temperature limits, but the Prime can handle steeper and much longer downhills before spinning the ICE than can a regular Prius. That is the answer for regular Prius, which has only an HV B mode and must spin the ICE. The Prime has an additional EV B mode, and larger battery and MG2, so can handle greater battery regeneration for a longer time without spinning the ICE.
Do Toyota Engineers ever visit and comment on PriusChat? I always wished they would, to give us definitive answers.
The North America marketing department had a minor presence here very long ago, more listening than posting. I haven't seen any hint of that in a very long time. For the Gen3 reveal, and possibly an even earlier event, a number of prominent members here were invited to meet with the engineers and have their questions answered. Those members collected and posted lots of useful information. But nearly all of them are long gone from this forum. Danny and Tideland do seem to be on good mailing lists for the freshest company news, but I don't remember them indicating similar Q&A meetings in ages.
Well given this is a 5th Gen Forum I'll offer that Toyota has offered since 2023 a custom option to choose a Low/Medium/High "Regenerative Brake" in 5th Gen Prius Primes and PHEVs via the vehicle settings in the multi-information (MID) display. Owner's manual describes it as a B mode "Regeneration Boost" where control of acceleration and deceleration is performed with the accelerator pedal only so as to reduce the frequency of changing from the accelerator to brake pedal.
