You'd have almost zero boost, and your would have to time it perfectly to drop the clutch at the sweet spot.

From what I understand, the boost needs to be built up - this can only be done under load (or possibly somehow via the ECU maps), second you would want an "initial limiter" set at around that RPM range (the sweet spot) so that would give you the ability to drop the clutch (or possibly kneed in the clutch), and finaly a different/modified map (I think - no expert here) - more throttle, in order to keep it from stalling(?)
I'm speculating here --- by no means am I an expert ...that's why we have Scott!

 

Launch assistant on the GT2 is more than a clutch dump.

When preparing for start by completely depressing the accelerator pedal, and when the throttle valve is opened completely, the engine speed is limited to approximately 5,000 rpm by disabling individual fuel injections. After the accelerated start, control is performed by comparing the actual torque map (determined from Motronic data and wheel rev speed in PSM control unit) to the target torque map, which is stored in the PSM unit and was determined by experiment. Differences between the actual and target maps result in control signals to the engine management. The engine uses these to vary the injection moment and disable or enable fuel injections for specific cylinders, resulting in the largest-possible transferable torque for optimum traction and acceleration.

In case of irregular wheel slip, anti-slip regulation supports the control system by using the electronic braking differential for wheel-specific braking. This ensures the best possible wheel traction.

 

Not to hijack too much but I have been after this holy grail of a clean launch since I bought my car as well. Can someone help on the terminology as I've never heard the term “Knead” the clutch. And how does that translate into the real physical action. Kneading sounds like there is a little bit of sensory feedback causing engagement modulation to avoid stall or too much wheel spin, right? Does "pop" refer to sliding your foot sideways off of the pedal and allowing it to spring upwards by itself or is it a semi-controlled knee-jerk reaction style of movement?

 

Sorry, I know this is a month old thread. But I'm very interested in good launches with my 997 tt tip as well. I've come across a myriad of magazine reviews of the car that clearly state that they used brake boosting (poor man's launch control) to get off the line and get those insane 0-60 numbers on stock cars. Furthermore, there's a press release from 2007 from Porsche about how the Tiptronic S that is in the 997tt, has been specifically designed to allow more boost buildup during brake torquing. I finally grew the ***** to do this and held the brake for about 3 seconds (with sport mode on and psm off), until the boost meter was building up, and the car began to want to break loose...and the result after I let off the brake was absolutely insane! Now I'm pretty sure you don't want to do this all the time, but it sounds like Porsche designed the tips to be launched like this and even advertised it as a press release. I'm sure many will disagree but doesn't sound like you need to buy software to do this. Now many of you guys with your modded 600 hp cars may not want to do this on the stock transmission...

 

First and foremost. If you plan to get any sort of good launch with the 997TT u need the GT2 slave conversion. This will make the launches consistant. I think this mod is more important than a Flash!!!

I tried to have a rev limit set in 1st while MPH at 0 to have a 2-step style launch. It did not work. All I did was burn up the clutch more trying to spool the turbos. Then the car would not rev past the Preset RPM in 1st if it was on the limiter in 1st on launch (no boost made either) The car would rev to redline if you left from a normal 1k rpm to redline.

I gave up on trying to cheat the launches with 2-Steps and antilag. Instead bought some tires and used some techniques from other cars.

If you rapidly press, release, press, release, press, release the gas pedal the load from the hard accel when stopped will have the turbos spinning very fast and making a couple of psi. I blip it from 3-5k rpm over and over. Then ride the clutch for the first 40 feet or so. Even if you had a 2-step making 5psi you would still have to sacrifice some clutch life to keep the car in boost on the launch

Wham bam 1.5 60's on the street.

Go get to work! I'd like to see some more 9-sec 911's please.

 

Anyone know how the stage 2 clutch heaviness compares to the GT3 standard clutch? Just curious in terms of daily driveability.

 

So whats the deal with this? Is there a way to add launch control to a 997.1TT Man?

 

You will never get a true PDK launch control with a stick shift car as a tuner upgrade (it is very feasible that the factory can put one together though). The idea behind the PDK launch control is that the computer not only modulates the gas pedal as required for power, but uses the brakes to slow down individual wheels that may be spinning to optimize traction. PDK also shifts faster than you ever will. The net result is that a 530 HP TurboS will hit 60 mph A FULL 1 second faster than a 620 HP GT2RS which is not only lighter but RWD. We have come to the tipping point where the machine and computers can not be topped by mere humans.

I believe both EPL and Softronic offer a 2 step "launch control". While I agree it's an accomplishment and a cool feature. Especially for older 996 and 997 cars, It is not really launch control. What it does do is allow for a lower rev limit when the clutch is depressed in 1st gear. IE When you floor it in first gear with the clutch depressed in 1st gear, the computer will limit the max RPM to say 4,000 RPM. This is accomplished by cutting spark to the cylinders just like the normal rev limiter. The upside is that the throttle body is always wide open which does help spool the turbos much better than of you were throttling the gas pedal and allows for a much more repeatable launch.

So the answer is YES you can add a "2 step" launch control to both 996T and 997T, but it is not what we call launch control today.