Does anyone know what exactly goes on when in launch control? Is the throttle plate wide open and fuel and cylinders are deactivated or is the throttle partially closed? I'm considering ordering a throttle controller but if the throttle is already wide open it wouldn't make any difference in 60ft times.
I also just ordered a set of wheels to use just for drag racing and was wondering if I can use them without the TPMS sensors without issues.

 

A throttle controller will not change launch control. That is a pre programmed routine and no manipulation of throttle signals will change it.

Yes you dont need tpms but make sure you either run all 4 sensors or zero sensors. Dont run just two

 

A throttle controler will make your throttle open quicker, so when launch control is activated and if the throttle is only partially opened it could effect how long it takes to open completely. I realize it won't change the routine of how launch control works but if the throttle opens fully quicker it could effect 60ft times especially when we're dealing with fractions of a second. Thanks for your reply.

 

Thats not how launch control works. Launch control once activated is controlled by the launch control programmed algorithm. Your right foot is already planted on the floor during launch control. No throttle controller can give you more than maximum throttle.

A throttle controller does not make the throttle open "quicker" per se either. Precisely what a throttle controller does is attach to the throttle sensor which is a voltage sensor and it modifies the voltage signal which makes the computer see a different throttle input compared to stock. It in no way "speeds up" this signal. That's not possible.

And since you already have your foot to the floor during launch the throttle controller will not impact this

 

I've actually seen videos showing that the throttle DOES open quicker and there is no delay in the response time. I realize the pedal becomes more sensitive or delivers more voltage with respect to position but the actual speed of the actuator is faster. If I can find the video again I will post it. That's why my question of the position of the throttle plate while in launch control is relevant. Is the throttle plate wide open or only partially open when launch control is activated?

 

You cannot change canbus speeds. We know precisely how throttle controllers work. Ive programmed them. They alter the voltage signal from the throttle pedal sensor. One single sensor. Thats it. That has no impact on signal speed. It impacts the signal itself so at 20 percent throttle pedal input the modified signal will transmit you are giving 40 percent input.

But again this is moot as you have your foot to the floor during launch. Your foot on the floor is the sane sensor the throttle controller manipulates. It will do nothing to manipulate a signal that is already at full signal.

 

So, when doing launch control, doesn't the RPM limit at around 3000 rpm while you foot is on the brake? What is limiting the rpm? Is the throttle plate actually being controlled by the ECM (or some module) rather than directly by the accelerator pedal? Once the brake is released, doesn't car now modulate certain engine parameters - maybe the throttle plate is one of them, to limit slip to maximize acceleration. During this phase, I would assume the throttle plate is being controlled by the car - since your foot is still firmly on the accelerator pedal.

I know nothing about throttle controllers, but I did look on Soler web site when the subject of throttle controllers came up in another thread. It was not perfectly clear to me, but it looked like maybe you had to (or at least you could) purchase the companion throttle body when using the Soler controller. So, if one now has a different throttle body, its raises the question of whether its response is different than the OEM throttle body, and how that might affect the way launch control works. I'm just asking.

 

Since Solar Performance sells this particular product maybe they could articulate little further about the throttle controller. And it seems like the real question is does it work in conjunction with the throttle body regarding wide open throttle. What is it actually doing to contribute to throttle body itself. I trying to figure out this concept myself.

 

I think your question is little different from what I am asking in post 7. I think the answer to your question is that the throttle controller changes the mapping between accelerator position and throttle plate position. But I think you can assume that when the accelerator pedal is floored, that will essentially call for a full open throttle. My question has more to do with what happens when the car is controlling the throttle plate - there are various conditions where the rpm and speed etc. are controlled by the so called nannies in the car. Under those conditions, you may have the accelerator pedal fully depressed, but the car does something to limit the throttle plate opening. The context of my question was launch control in post 7. I was wondering if, and how that interaction between the accelerator pedal position and throttle plate position might be affected when the car is intervening or partially controlling the throttle plate position.

 

Okay......hope we could find that solution to your question.

 

That is correct. With the brake depressed say 60 percent or more (or whatever is required) AND the throttle being floored (or perhaps at 80 percent or whatever is required to trigger launch control mode)

Once in launch control mode your max revs are computer controlled.

Now on some dct launch controls i can still control the throttle plate up to the launch limiters using the accelerator pedal BUT even then having a throttle controller would only make this worse because the whole benefit of being able to control the revs while in launch mode would be so you can control or specify the launch rev.

So as an example if i was on street tires on an unprepped surface on sime other dct cars i have i can launch at 2k rpm to get the best 60 foot due to traction limitations but if i had drag sicks on with a prepped surface i could go to max launch limiters to get the best 60 foot.

A throttle controller would only hinder you in these scenarios as you want as fine of control of the entire length of the pedal travel to get the exact launch rpm you want. Having a controller on that reduces your fine control ( ie, it commands 40 percent throttle body opening when giving 20 percent input) would make this a much harder task.

Throttle controllers are great at making a car feel faster or "more responsive" around town. They are a hindrance for road course or 1/4 mile work. But that's fine because you can set them to stock for that

Example of a car i can control revs with...


Here i launch at 2k rpm releasing the brake on the upswing just off idle and it catches at 2k...



Here i hold at 4k and launch...

 

It would be really nice if you could launch at a higher rpm at the track. It would also be nice if you could make the gas pedal less sensitive when just cruising so it would be easier to stay at a consistent speed. I think the throttle controler will allow the second sinario but not the first.

 

Yes I agree on both counts. The first requires the tcu to be recalibrated (tuned)

 

I think the following applies to the Z06 - its from the 2023 Owners Manual - and appears to describe some of what you suggest.

 

When you are in launch control the TPS is around 46% iirc. When you release the brake and the clutch starts to engage it will ramp up to 83.9 (which is wot) at about 4 mph according to my HP tuner logs. As was mentioned, you are already flooring the pedal so the commander would add nothing imo.