red line the tach on a Volt Gen I?
1 - 20 of 24 Posts
The driver of the Volt has zero control of RPM, directly. It is not possible to over-rev the engine. D and L on the shifter are not gear ratios, just software settings to control how aggressive regen braking will be. The accelerator (or "go") pedal is electronic as well.
The Volt's electric motors are combined in a planetary gear set to create an eCVT, so there is no gear ratio you can set to force an over-rev condition. Obviously you could if you hacked the car some way, but not in standard operation.
If you really want to get RPM, it is available through OBDII port.
The Volt's electric motors are combined in a planetary gear set to create an eCVT, so there is no gear ratio you can set to force an over-rev condition. Obviously you could if you hacked the car some way, but not in standard operation.
If you really want to get RPM, it is available through OBDII port.
Joined
·
13,358 Posts
The volt internal combustion engine has a mind of its own. You could be cruising down the highway and the engine could shut off, and you could be stopped at a stoplight and the engine could be at wide open throttle (you have to be driving like Jeff Gordon, then suddenly stop to achieve this feat).
You can only see engine rpm through canbus/odb2. The electric motor is speed governed as well to keep the MotorA/B I think under 9,000 rpm. Hence the 100 mph speed limit. The gas engine is nowhere near redline. It is setup like a CVT/generator to run at specific rpm's for torque and power.
It is software, you can override it with the appropriate software like a mongoose setup.
It is software, you can override it with the appropriate software like a mongoose setup.
Actual RPM numbers are available through the OBD port, and can be displayed through any flavor of OBD2 reader including bluetooth/wifi capable dongles attached to a smartphone/tablet, etc. In the DIC there is a graph that will display a rough idea of how high the engine RPM is from off to "WOT". In my experience based on the little graph as well as hard numbers with an OBD2 dongle is that at full out max RPM the ICE is at about 5000 rpm. Generally I've only seen that when climbing a steep grade at 70mph. Most of the time it's rare to see over 4200.
Even at lower RPMs when one would not expect the throttle to be open fully, it's actually at about 87.5% according to the TPS reading and has been observed at such even as low as 2000 RPM. Not sure how it achieves such a low RPM with the throttle open so wide unless it has a way to adjust the valve duration or if it's metering fuel rather than air to control engine speed.
Even at lower RPMs when one would not expect the throttle to be open fully, it's actually at about 87.5% according to the TPS reading and has been observed at such even as low as 2000 RPM. Not sure how it achieves such a low RPM with the throttle open so wide unless it has a way to adjust the valve duration or if it's metering fuel rather than air to control engine speed.
Joined
·
1,342 Posts
What's a mongoose setup?
Joined
·
13,358 Posts
The OP is speaking as if they[d like to add 3 inch pipe, a fart can, NOS, and a big ass wing on the back to get the volt to go faster. Don't forget the undercarriage neon glow kit, tinted windows, big booming bass sterao, and an assortment of stickers. Those always make the car go faster.
Joined
·
23,703 Posts
Why would you even want to?
In any of driving "gears" . . . D, L, or R . . . the computers control things. If you really want to try throwing a rod, leave it in P and pop the hood. Then you can rev the engine with the accelerator pedal. Not sure how high you can rev it, but looking forward to your testing it.
When I’m running an EMM while parked in my driveway in my 2012 Volt, I am able to influence the engine’s rpm modestly by stepping on the accelerator pedal. I suspect that’s because the EMM process is intended to lubricate the engine’s parts. Not sure how allowing the driver to use the accelerator pedal to change the rpm of the gas-fueled electric generator while the car is in motion would affect the car’s performance.
The engine in the 2012 Volt is an advanced version of the motor from earlier Cruze models. It is a multi and variable valve plant capable of probably more than 9000 rpm by design, but has been tuned as an Atkinson-cycle plant, limited to 4800 rpm, (taking advantage of the variable valve timing to improve economy rather than power)
reference: https://en.wikipedia.org/wiki/Atkinson_cycle
reference: https://en.wikipedia.org/wiki/Atkinson_cycle
Joined
·
23,703 Posts
I hear you. I have the same concern with the steering wheel. I don't want to turn it too hard.
Seriously, the ICE is a standard engine tuned to work as an electric generator. It's as reliable as any and is babied not only because the max revs are kept low, but the engine itself is lightly used for most Volt owners. My 6 year old Volt has over 95k miles, but only 23k of those miles are on the ICE. That engine has seen only two years of light use compared to a non-EV.
I think that's because we tune out engine noises when they're constant and not so much when intermittent. From everything I've seen the Gen 1 Volt design is conservative and pretty idiot resistant. On a road trip if the speed limit is 70, I do 70. Usually for road trips, I'll engage hold mode at 3/4 to 1/2 charge and just drive.
Joined
·
131 Posts
Lol! Where can I get a big ass wing? Kidding of course...........
2014 Volt Premium - Safety pkg 1 and 2, Navigation
http://www.drewtech.com/mongoose/gm2.html
Can pretty much change anything you want if they have written the code for it. The hybrid modules are finally coming along.
You can do anything with the gas engine there's even an e85 map in there you can enable that is disabled by default?
1 - 20 of 24 Posts
