I know the C7’s have a no lift shift feature on the manuals. I get the concept and everything but I’m curious to if it can cause any damage to the car long term. I’ve never used it and I’m just curious and was thinking about trying it, just looking for some insight before I just go and do it.

 

I do not think using the feature will cause any long term damage unless you keep missing the shift. I have used it and you definitely are shifting faster than normal so it takes a bit to get use to. Obviously it is not a feature you would be using all the time. It would be more for drag racing, or a real spirited run through the gears on an open road.

 

Ok thanks for the input I’ve been thinking about going to the drag strip recently. That’s really the only time I’d use it.

 

Just learned something today

 

It will cause significantly increased wear.

 

I used to use it on my Z51 and 1LE on the track. No problems. I wouldn’t use it all day every day though.

 

I agree, occasional use it would b OK, but I wouldn't want to use it every time I drove the car.

 

It doesn't really hurt to use it. All it does is maintain engine speed at a certain level so it will match drive shaft speed when the clutch is let out. I doubt it isn't any more harmful than rev match is.

From a GM Authority Article (General Motors No Lift Shift Technology | GM Authority) :

General Motors No Lift Shift Technology

No Lift Shift (NLS) is a General Motors propulsion technology for cars with manual transmissions that allows the driver to keep the gas pedal to the floor while upshifting. To do so, NLS manages torque during wide-open-throttle acceleration to allow for a “flat-footed” upshift. In order to properly execute a no-lift shift, the driver must keep the gas pedal full depressed and shift at the appropriate RPM.

How It Works

No Lift Shift aims to aid the driver in executing the quickest, yet smoothest upshift by managing the engine’s speed. As explained by GM’s Al Oppenheimer himself, the engine management system keeps the throttle open for both boosted and non-boosted applications when passing through the Engine Over-speed Protection during a shift.

In Engineering terms, when triggered, there is an immediate torque control, with fuel and spark, for a set time. Then, the software uses a predictive control which uses the throttle to control torque. This allows the driver to take advantage of fast torque control for a short period of time without heating up or damaging the catalyst over time.

Al also clarifies that there are both enable RPM’s and target RPM’s for each transmission, which are different for each engine application. Additionally, for vehicles with a mode selector, there is no difference between Tour/Sport/Track/Snow-Ice mode or PTM mode when performing the quick shifts.

Benefits

As mentioned, a driver is aiming to be both smooth and quick when upshifting as optimally as possible. By helping to regulate engine speed, the system removes one of the many variables behind flat-foot driving. This is particularly convenient at the track, where a rough shift could unsettle the chassis. For novice drivers, the tech also acts as a safety net for their investment.

In addition to being a driver’s aid, GM’s No Lift Shift technology also takes some of the load off of the mechanical hardware, and should extend the life of the drivetrain due to less shock, especially the transmission.

It’s also worth noting that, in certain applications, the system also maintains boost in boost, which propels the vehicle into the next gear with as much momentum as possible.


Bill

 

Thanks Bill really informative

 

Im scared!

 

So who is gonna go out there & try it today?

 

Bill,

Thanks for the great input. Do you know what minimum RPM is required to use NLS?

MrHix

 

I used it in my ATS-V. I feel if anything it reduces wear and tear on the driveline.
Makes for very smooth full throttle upshifts.

Track season starts this weekend for me we'll see how the GS does.

 

Absolutely False.

 

Since it only works in full throttle upshifts you'll rarely use it. I used it at the track and will on occasion on the street but you would be getting in a lot of trouble using it all the time since it's for WOT upshifts.

 

I recall reading 5000 or 5500 RPM for the C7 7MT.

Oh, power shifting is absolutely okay? Awesome! Let's go do it all day every day and replace clutches and rebuild transmissions every 40k miles because that's totally normal and would have needed to be done anyways, right?

 

First it's NOT power shifting. Power is cut, just by the car, not you. Second, just because you say this will require clutch and transmission replace/rebuild doesn't make it so. I use this feature just about every time I drive the car, not every shift, and don't believe it's something the car wasn't designed to handle. As for clutch wear I'd bet slipping the clutch at lower throttle or rpm's will cause as much or more wear. Either way the clutch is a wear item, and using NLS doesn't seem to be breaking drivetrain items (if it were BELIEVE ME this forum would be lighting up with the outrage).

 

Man read your manual and get with it this is not the 60's. Try to understand the technology behind NLS and forget your power shifting days of years past.

 

I understand the concept and the technology, but with 60 years of muscle memory, everytime the left foot pushes the clutch in, the right foot lifts the throttle, no matter what my brain says to do.

 

Ive tried it but Im with you. It feels weird to do it. I dont use ARM either except on track. Guess Im set in my old ways.