im doing a presentation in one of my electronics classes and i wanted to do it on the no lift shift feature on the ss/tc cobalts, i was wondering if anyone here could explain exactly how the system works, i need everything from start to finish, what sensors are involved and how the computer uses there inputs, also if u no any circuit diagrams that i can look up that would be useful that would really help to, any assistance would be much appreciated.

 

sorry i am not much help. I believe it works by cutting the spark to the spark plugs. Also when this is going on the fuel is still being distributed to the cylinders so you have raw fuel going into your exhaust. This raw uncombusted gas is what causes the loud BOOM and if you are behind the vehicle you will even see a flame come out the tail pipe, especially if you have a catless downpipe.

 

so you want someone who knows about it to do it for you?

From what i read its a sort of algorithm that allows it to work when the rpms are up and the computer knows to hold the revs as long as the pedal is depressed.

Something like if variable A = At certain revs
Variable B = Pedal at 90% wot or more (i think)
Variable C = you hit clutch

itll hold. Im no expert and i could be wrong but its something like that, it doesnt seem to be TOO fancy when you think about it.

 

It;s not exactly fancy and definitely not new. People have been using WOT boxes which do the same thing. It's just nice to have it from the factory and a car that is meant to be used this way

i suggest you look up WOT boxes. They do the same thing and will probably have a more detailed explanation of what happens

 

nah, im not really trying to get other people to do it for me, its just when i came up with the idea this was the first place that came to mind, im still researching it on my own too but this is only day one, and i also have to verify everything im told on here cuz forums arent really considered credible sources, but thanks for the info, i also no a guy that works at a chevy dealer as a tech so im gonna be hitting him up as well

 

Here's the how-to directions:



Note that it is enabled in any traction or ESC mode (as it says in there), so disregard that part of the equation.

 

oh and its not a certain rev. you should be able to do it in any rev, but for the vehicles safety, do it in the higher revs, maybe 5500rpms or more. other wise you'll be unloading alot on your clutch and tranny.

 

^ very true. putting a lot of load on the clutch in low RPMS= slippage like a biotch

 

Does no lift shift still work when all tcs and stability is turned off?

 

Yes, hence the manual stating it works in all modes.

 

I thought it retarded the igniton timing and adjusted the valve timing to keep load on the engine...... IIRC the cam can be adjusted to control how long the fuel is burnt or something.

I'm pretty sure it's a lot more complicated than just cutting spark ...... But I could be wrong.

 

I have a Aeroforce interceptor, maybe i'll try recording some data with it, lol. As soon as the shifter is fixed...

 

I'm sure it's patented, so you could try to find the patent number and look it up.

 

I'm sure it's patented, so you could try to find the patent number and look it up. I would pick something simpler if I were you.

 

thanks for all the help, this still isnt set in stone, im seeing what i can get on this first before my group decides for sure what were gonna talk about, its ether this or the 370Z's automatic rev match feature, which is also really complex

 

NLS= WOT shifted NEAR redline, shift must be completed within .3seconds. It basically delays the spark and allows you to keep the boost into the next gear.

Nothing new, its called Power Shifting. But I do believe the "new" part that the TC/SS is the actual ECU algorithm (think computer code) that delays the spark for ya.

I hit my NLS at 5800, I found 6k RPMs to be to touchy.

 

Note if the traction control isn't off and you NLS without good traction is bogs the **** out of the car. It feels like the car has lost all power and the rpms take a little bit to catch back up, the engine light also flashes for a few seconds. After about 1-2 seconds everything returns to normal though.

 

I believe you also just described a misfire, hence the flashing CEL. I'd check codes, but I bet you've got a least a P300 in there.

To the OP: If you want to do something that's perhaps a bit easier, try getting your hands on a WOT Box and take it apart. It does the same thing and would be a bit more tangible and easy to figure out.

I also figured this out the other day, but 3,000RPM is the magic number for shifting. Below it, the RPMs fall slowly during a shift. Above it, it cuts spark and fuel, and the RPM drops quicker to allow for a quicker shift. I've noticed that it did it sometimes and sometimes not, but I never realized the variable until recently.

There are also other systems, such as the Electronic Stability Control system and the GMLAN (from both an electrical and computer network point of view) that might be interesting to do a report on. With the networks in cars nowdays everything is connected, and any connection to it can talk with any of the systems. Heck, in a G6, it's radio tells you on a single screen that you're listening to Beyonce... and right below that, that you've got 29psi in your back right tire.

 

basically what this class is about is controller area network systems and how they operate, most people do there reports on the same thing, drive by wire, active suspension, integrated starter alternators, or electric vehicles, im pretty sure this hasent been done very much if at all, thats y i really what to do this, i wanna be different

 

Ok cool. Speaking of active suspension, here's a form of it that I came across a while back that I thought was cool. http://www.youtube.com/watch?v=eSi6J-QK1lw

What about taking apart an RPD and seeing not only how it works but how it interfaces with the CAN too? Not only would it be cool for a report, but it'd also be of worthwhile value to the community I'd imagine.

 

that probly would be fun, if i have to do any other reports ill remember that, the building my class is in, half of it is used as the GM regional training center for this area, so theres a lot of information there, i just got to find time to talk to the guys there, ill let u guys no what i find out

yea, the boss suspention is what most people do theres on actually, its kinda cool but it gets old seeing it over and over again

 

doesnt work with an automatic, hope this helps