Does anybody know if the shuttle mode on the E-Ray can be locked in ? For example if you drop the car off
for detailing or valet parking , so you know your car is not getting " tested " while you're not around . The temptation would be there especially for a new model that just came out.

 

I haven’t seen that in the manual but I’ve not read it completely. I do like your thinking, though.

 

From reading the Owner's Manual, I'm pretty sure Shuttle Mode can't be locked in that way.

I think Teen Driver Mode will do what you want, though. You can restrict the speed, and you need a PIN to change the settings. Use a dedicated Teen Driver key, and you get a "report card" of what transpired while being driven in that mode.

 

Thanks for the info.Where is teen driver mode found and where would we get a dedicated key ?

 

It's not a special key, just one of the keys that came with your car would be the "teen driver key." Or you could buy another key and have it programmed (and backup key cut) to go with your car.

 

Interesting, as the Owner's Manual notes, just have to drive past 15 mph and Shuttle Mode shuts off.
"Shuttle Mode : Use to propel the vehicle using only electric power. Shuttle mode is not intended for public roads. The typical range in Shuttle mode is about four to five miles depending on the starting SOC, vehicle speed, terrain, and other driving conditions. While the vehicle is in Shuttle mode, the instrument cluster only displays the vehicle speed, battery gauge, and a electric power indicator gauge. The infotainment screen will only show the date and time. If equipped, the HUD system will not be functional. Shuttle mode automatically deactivates if the following occurs: . The vehicle speed exceeds 24 km/h (15 mph). . The outside temperature is lower than –10°C (14°F). . The high voltage battery SOC is 0%. To deactivate Shuttle mode, put the vehicle in P (Park) and turn off the vehicle. Then, start the vehicle normally. Shuttle mode will automatically start to reduce propulsion power as the SOC reaches 0%. The message Start Engine to Charge Battery will display on the instrument cluster when the SOC reaches 5%. If the engine is not started, propulsion power reduces automatically and the vehicle comes to a stop."

SIDEBAR (charging batteries)
That statement that follows corrected the error in a prior 2024 Owner's Manual (see pic below) stating "when the high voltage battery runs down may need to be plugged in:"
"The only way to charge your battery is to start and run the vehicle from Normal mode. See “Normal Mode” later on in this section."

They also removed the below statement from that section of the Owner's Manual. The statement about "if storing over a week..." is still there and needs to be clarified. Or perhaps if we wait long enough it will be removed from subsequent Owner's Manuals!

Pic from early version of 2024 Owner's Manual I had downloaded

 

Thank you Jerry, that is some useful information.

 

Seems like it would have been useful to give it some kind of way to idle & recharge the battery, without being able to drive it. It sounds like with the "Teen key" or whatever, you're basically stuck in a handicapped version of stealth mode. So that's fine, but if I don't want to leave the regular key with a mechanic--it would be nice to still be able to start & idle the car to recharge the battery. And then have it auto-shutoff if someone attempts to shift it out of park.

 

Hmm, the 12-volt Li-Ion battery has been reported to be charged by the high voltage battery NOT the cars alternator. That is similar to other Hybrids as it reduces gasoline energy use (and some other reasons.) Charging the high voltage battery requires braking, coasting or the ICE pushing the front wheels to turn the generator while driving.

 

Fair point. Really does seem that shuttle mode is worthless. Now if it was locked to V4 and a top speed of 35 mph, that would be more useful.

 

^^^
If I had Shuttle Mode on my street rod would be great so perhaps those with E-Ray Garage Queens can use it like I would!

The worse thing for an engine and oil is cold starts and not driving long enough to have the oil get hot enough, long enough to evaporate much of the water of combustion that passes the cold pistons and forms things like sulfuric acid in the oil. (The OLM measures oil temp and if many starts are followed with short drives it will shorten the min 12 months for an oil change. Mt '93 Vette Owners Manual (prior to the OLM) said if most drives are under 4 miles, change oil every 3000 miles OR 3 MONTHS WHICHEVER OCCURS 1ST.)

So I avoid starting my street rod to move it out of the garage. IF I must, to say get a ladder, I drive ~25 miles to get the oil hot. Otherwise it is mostly driven to local car shows. Could use Shuttle Mode for that! But then Stealth Mode can do the same!

Street Rod Parked in last garage with ladders on that wall. If I need to remove the 20 foot ladder, the street rod must be moved. Shuttle or Stealth Mode would avoid me taking a ~25 mile drive to get oil hot enough, long enough to evaporate the water of combustion from the oil. Especially an issue with the 8.2 Liter BB with forged versus cast C8 aluminum pistons (forged have a higher expansion rate and in the 8.2 Liter engine they are very large so cold clearances are also large.) For the 1st minute the piston slap from cold pistons sound like a sewing machine! All is quiet after when the pistons expand! Pic when installing side skirts.

 

what credible source are you quoting here?

 

A very "credible" fellow whose business is related to Hybrid/EV drives etc. Have learned a lot about Hybrid/EV motors etc from his posts compared to standard electric motors. Been a Mechanical Gearhead since ~13, getting electrons in my brain to better understand these EV systems now!

Here were posts re charging the E-Ray 12 volt Li-Ion Battery charging. Quoting RedLS6:
1st post:
Standard LT2 yes, but the 12V E-Ray bus shows a path from the high-voltage battery to the 12V side.

2nd Post:
APM (circled below) stands for Accessory Power Module, "accessories" being everything operating from 12V; it's standard industry nomenclature, and nomenclature within GM, for a DC-DC converter which bucks the High Side (300V) voltage down to 12V and provides battery charging as well as general 12V operation. I wouldn't be surprised if they've borrowed this module from prior GM art or from the Ultium side, as the Ultium team has already developed an APM, integrated with the inverters as this one is..

My question has been, did they also keep the alternator, or save the weight and eliminate it, choosing to operate solely from the DC-DC. Eliminating the alternator, while also providing stop/start capability for an ICE from a HV battery, has already been done elsewhere in the industry. Keeping the alternator may be an option in the event that the DC-DC is not optimal for all use cases of the E-Ray, but it's actually more software and controls work to integrate an APM together with an alternator, as they'll fight one another if not balanced. Plus the extra weight.

Reading what another Poster quoted from a Car & Driver article of why have 12-volt batteries at all:
As with many Hybrids that also use for the 12-volt Li-Ion batteries they are charge buy the motor battery that uses mostly otherwise wasted braking energy. Assume there are a number of systems that need that constant ~12 volt source. A converter going from 400(?) volts to 12 volts to charge the battery is one thing using for all devices they need the 12 volt source is another.

"We asked Hyundai's EV engineers why the 12-volt battery persists, and Ryan Miller, manager of electrified powertrain development, responded. "All the ECUs in the vehicle are powered from the low voltage, as well as the power relays that separate power from the high-voltage battery pack and the rest of the high-voltage network in the car," he said. "That separation allows us to safely disconnect the high voltage from the low voltage when the vehicle is not being driven or in the event of a crash."

 

Seems to me that the Corvette team has been steadfast in keeping these systems independent, so that the LT2 is not dependent upon the electric motor, its batteries or functions. It also seems clear that in the ERay, the electric motor is only a power adder, with the benefit of having stealth and shuttle modes simply because they can. Some have speculated that the ERay's electronics recharge the 12V, but I don't see where anyone has reported that it does. Can't wait to see what the Corvette team has to say about this topic.

 

^^^^
Yep we don't have an "official statement" but the somewhat strange comment about disconnecting the 12 volt Li-Ion battery Negative terminal AND the Controller Area Network if stored for over a week" also makes me think what RedLS6 found re the 12-Volt to high Voltage hybrid battery circuit may be part of the reason it's being charged, as many other Hybrids, via the high voltage battery.

Sometimes you have to draw your own conclusions as GM will not say, like just what Mulan is and where it it is used! Like some 3LT dashes on the C7 and C8 having issues and 1 & 2LT not!

SIDEBAR
As more info comes to light, it's validating the speculation in my December 2019 PDF of the C8 Hybrid and why there is Stealth Mode (has little to do with sneaking out of your house so neighbors don't hear your exhaust!) It was written after the leaked article in November 2019 and posted on the forum (see bottom pic.) The published article also had a passing statement that most C8's will be hybrids in time!

1. After reading the 1174 page required EPA mpg report and press release from 2012 it was clear the Corvette Family would be "required" with all other sports cars to get EPA Test mpg of ~39 mpg in 2025. Some cars families listed as required to achieve >60 mpg. Hybrids were listed as the probable method many would be use. All to cut CO2 emissions from cars and light trucks in ~half.
2. Just prior to the Pandemic Ferrari said 60% of their cars would be Hybrids in 2022. All their hybrids even now are "Performance Hybrids" (but they mostly just have to implement high mpg software.)
3. At the E-Ray reveal a GM engineer said he was working on the hybrid C8 in secret from when it started design (which was 2012/2013.)
4. Both Ferrari and GM were smart enough NOT to start with the full blown Prius type operation as sports car folks did not want forced Stop/Start and in normal cruising having the ICE start only after the electric motor brought the car to 45/50 mph. But that is mostly a software issue and WHEN A GOVERNMENT TOOK THE BLAME THEY WOULD IMPLEMENT!
5. Now that the goal posts have been moved to no fossil fuels allowed that most Vettes being Hybrids may never happen.
6. Nope GM will not admit that is the reason, like the real reason for no standard shift they do admit was a decision made at the start of the C8 design in 2012/2013. A doubting Thomas will not be able to put their hand in that wound!
7. This is the PDF updated past the E-Ray Reveal: http://netwelding.com/C8_FWD_Hybrid.pdf

Pic is from leaked article published in November 2019. I added words from text. Pretty close to the E-Ray. Article also said most C8's will be hybrids!

 

There is a lot of detail about this system that has not been officially released, such as whether they rely on an alternator, whether they eliminated the alternator and rely solely on the dc-dc converter to charge the 12V from the HV, or some mix of both. Lots of discussion on this in past threads.

The slide below shows the dc-dc converter connecting the HV battery to the 12V battery, which I circled in Orange. The operating use cases for when the dc-dc charges the 12V have not been released.