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Old 06-20-2006, 11:35 PM   #1
bren wrx
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Default Cobb, where is our launch control?

Some of us are dying with LW flywheels, i heard from a reliable tuner that this is in the works, how soon ??
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Old 06-21-2006, 03:10 PM   #2
pezman04wrx
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I've posed the same question on the Cobb forums, and conesensus has it that it can't ever happen ... Piggy back systems are different, and can manage launch control just fine ... The AP however is an ECU tune, similar to the ECUTek and can't ever happen ...
Quote:
Originally posted by Josh:
The ECU does not get input from the clutch pedal switch. So the ECU does not know when your clutch is in. I do not believe there is a way to add in code to give it two different RPM limiters with 0 MPH input either. It would require another set of electronics with aux. inputs.
^^^ I cut/paste this from my queries there ...
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Old 06-21-2006, 03:21 PM   #3
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you can't start your car without the clutch depressed. Your ECU is getting a signal....it's tapping into it that's the key.

When I setup launch control with my Utec I tapped into that signal so I didn't have to buy that extra part from turboxs. Worked just fine.
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Old 06-21-2006, 04:30 PM   #4
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Quote:
Originally Posted by scooby24
you can't start your car without the clutch depressed. Your ECU is getting a signal....it's tapping into it that's the key.

When I setup launch control with my Utec I tapped into that signal so I didn't have to buy that extra part from turboxs. Worked just fine.
Wrong, having the clutch depressed activates the starter circuit. You could never push start a car going with what you are saying.

Not much has changed in that system since before car's had ECUs, but had clutch lockout switches. However it is different on Drive-By-Wire cars as the Cruise Control is controlled by the ECU. Which is why you are probably confused.
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Old 06-21-2006, 06:04 PM   #5
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Quote:
Originally Posted by Master2192
Wrong, having the clutch depressed activates the starter circuit. You could never push start a car going with what you are saying.

Not much has changed in that system since before car's had ECUs, but had clutch lockout switches. However it is different on Drive-By-Wire cars as the Cruise Control is controlled by the ECU. Which is why you are probably confused.

Ah well the Utec just needed an open circuit to tell when the clutch was depressed then. I figured the circuit was tied into the ECU which activated the starter. If that's not the case then I stand down.
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Old 06-21-2006, 06:14 PM   #6
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Why would the ECU need a signal from the clutch to implement launch control?

IF vehicle_speed = 0 & rpm > launch_control_limit THEN fuel_cut = TRUE.
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Old 06-21-2006, 06:21 PM   #7
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Quote:
Originally Posted by Jon [in CT]
Why would the ECU need a signal from the clutch to implement launch control?

IF vehicle_speed = 0 & rpm > launch_control_limit THEN fuel_cut = TRUE.

....c'mon Jon.....it isn't quite that easy....but almost
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Old 06-21-2006, 06:25 PM   #8
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Quote:
Originally Posted by Jon [in CT]
Why would the ECU need a signal from the clutch to implement launch control?

IF vehicle_speed = 0 & rpm > launch_control_limit THEN fuel_cut = TRUE.
Can the ECU handle that kind of an IF statement? If so you still have to impliment the Launch Control component. It's usually not a fuel cut but rather an ignition cut which will have a set firing order which may be outside of the boundaries of the stock computer's capabilities....I have no clue though what the stock computer is capable of.
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Old 06-21-2006, 06:33 PM   #9
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Quote:
Originally Posted by scooby24
Can the ECU handle that kind of an IF statement? If so you still have to impliment the Launch Control component. It's usually not a fuel cut but rather an ignition cut which will have a set firing order which may be outside of the boundaries of the stock computer's capabilities....I have no clue though what the stock computer is capable of.
If there was enough space to program that, I bet it is possible. The ECU can fire each cylinder individually, so it shouldn't have too much of a problem with that. but it would need a serious reworking of the whole code, not just fuel/ignition/boost like they are doing now.
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Old 06-21-2006, 06:39 PM   #10
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Quote:
Originally Posted by Master2192
If there was enough space to program that, I bet it is possible. The ECU can fire each cylinder individually, so it shouldn't have too much of a problem with that. but it would need a serious reworking of the whole code, not just fuel/ignition/boost like they are doing now.
Well I think going off the clutch signal is the best way to go since you not only get ignition cuts at launch but also as you shift. Makes for great, consistent times.

With mine I was able to keep the foot on the floor from start to finish without ever lifting. When the clutch was pressed to shift the ignition cut was kicked in which kept boost going and made shifting very smooth. It was strange though how quiet it would get between shifts.

braaaaaaaaaaaaa <clutch in> .......gear clunk....brap......<clutch out> braaaaaaaaaa
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Old 06-21-2006, 06:44 PM   #11
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Quote:
Originally Posted by scooby24
Can the ECU handle that kind of an IF statement? If so you still have to impliment the Launch Control component. It's usually not a fuel cut but rather an ignition cut which will have a set firing order which may be outside of the boundaries of the stock computer's capabilities.
If all you need out of launch control is to be able to maintain a fixed RPM at the line while the pedal is to the metal, then augmenting the cruise control programming is the way to go on the DBW ECUs. You'd change it to interpret the setting of cruise control ON at zero vehicle speed to actually be the setting of the desired launch control engine speed, not vehicle speed. And then, as long as vehicle speed is zero and throttle pedal position is "floored," the cruise control modulates the throttle opening angle to maintain the set engine speed.

Last edited by Jon [in CT]; 06-21-2006 at 06:59 PM.
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Old 06-21-2006, 07:01 PM   #12
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Quote:
Originally Posted by Jon [in CT]
If all you need out of launch control is to be able to maintain a fixed RPM at the line while the pedal is to the metal, then augmenting the cruise control programming is the way to go on the DBW ECUs. You'd change it to interpret the setting of cruise control ON at zero vehicle speed to actually be the setting of the desired launch control engine speed, not vehicle speed. And then, as long as vehicle speed is zero and throttle pedal position is "floored," the cruise control modulates the throttle opening angle to maintain the set engine speed.
Just thought of something...when cruise is on...if you press in the clutch cruise is disabled. Where's it get that signal from if it's bypassing the ECU?
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Old 06-21-2006, 07:33 PM   #13
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DBW cars have a clutch switch input to the ECU so we can see when you're on/off the clutch for those cars. There's actually a lot of interesting things you can do on the DBW cars.

Launch control and a few other fun things are coming. We're focused a bit on the new AccessPORT at the moment but there are many things being refined that we expect to release this year. Shame not all cars came with the same inputs to the ECU but we're working with what we have to bring as many exciting features as possible to market. We have to continue to innovate, not follow. Right Jon?

Trey @ COBB
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Old 06-21-2006, 09:56 PM   #14
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trey, launch control release around this summer/year?
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Old 06-21-2006, 10:14 PM   #15
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1) the New accessport, does that mean 07's or a completely new handheld module and software revisions?

2) Tell us more about the launch control... whether you are using a handheld unit or a separate module that complements the handheld device?

I sent you an e-mail suggestion about this like 3 months ago but I guess you hear so many inquiries about this it just got thrown into a heap of other inquiries. Awsome to hear that this is going to happen though.
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Old 06-22-2006, 07:12 AM   #16
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Quote:
Originally Posted by Trey
Launch control and a few other fun things are coming.
Trey @ COBB
Though I'm extremely pleased to hear this, I wish it could happen in a non-Cobb timeframe ...
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Old 06-22-2006, 11:56 AM   #17
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so the new features (launch control, eg) can be uploaded into the accessport and be usable for all years?
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Old 06-22-2006, 12:17 PM   #18
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^^^ That is what I am trying to clarrify. I think there would have to be a separate flash parameter of somekind so the user can pick the rpm to set the launch at... in which case you would need a standard map plus some accessory map that holds your desired information. If its a secondary stand alone module of some kind, then it could potentially be alterable on the fly, but trey hasnt responded to my post a few posts up just yet.
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Old 06-22-2006, 12:25 PM   #19
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Quote:
Originally Posted by Vince126
so the new features (launch control, eg) can be uploaded into the accessport and be usable for all years?
Doesn't sound like it, since Non-DBW ecu's do not have a clutch switch input, the only way to get launch control is a piggy back ecu.

Quote:
Originally Posted by Jon [in CT]
And then, as long as vehicle speed is zero and throttle pedal position is "floored," the cruise control modulates the throttle opening angle to maintain the set engine speed.
This doesn't sound like a true launch control, it would hold rpms, but the biggest part of launch control is being able to build boost at the line. Just holding the throttle at a single rpm, or pumping the throttle will only do this so well. Having a Wide open Throttle and cutting ignition is the optimal way.

It'll be interesting to see how Cobb does this with the DBW ecus.
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Old 08-16-2006, 11:51 AM   #20
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hellllllllllllo? anybody there

launch control needed
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Old 08-16-2006, 01:36 PM   #21
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^^if you dont have an STi, or an 06+ wrx, it isnt likely that this will work on your car so don't get your hopes up. It requires drive by wire in order to work, which means we will most likely need a unichip in addition to the accessport to make this work along with additional wires.

I also have a hunch that you will have to purchase a brand new AP in order for launch control to work, being that Cobb is about to release a completely new handheld module that is smaller and cooler looking... but I'm not down for another $600 for no particular reason other than a new controller and a few updates as my car is running perfectly minus launch control which would be nice but isnt worth 600bones to me.
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Old 09-04-2006, 07:22 PM   #22
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taps fooT!!!!!
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Old 09-05-2006, 09:28 AM   #23
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Quote:
Originally Posted by Trey View Post
DBW cars have a clutch switch input to the ECU so we can see when you're on/off the clutch for those cars. There's actually a lot of interesting things you can do on the DBW cars.

Launch control and a few other fun things are coming. We're focused a bit on the new AccessPORT at the moment but there are many things being refined that we expect to release this year. Shame not all cars came with the same inputs to the ECU but we're working with what we have to bring as many exciting features as possible to market. We have to continue to innovate, not follow. Right Jon?

Trey @ COBB
Trey care to chime in on this thread again??

Would love to see what is in store for Cobb users moving forward . I know I will be waiting to order my AP until these new features are ready

Thanks
Mike
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Old 09-05-2006, 03:01 PM   #24
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Someone explain launch control to me...lazy way to keep people from tearing out their transmissions?
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Old 09-05-2006, 09:16 PM   #25
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OMGHi2U R U kidding??

Quote:
Originally Posted by EnterTheDragon View Post
Someone explain launch control to me...lazy way to keep people from tearing out their transmissions?
The last time I heard it defined while watching an F1 race was "Optimized acceleration from a standing start with minimized wheelspin".

Oh wait, I'm explaining this to a Specialist that joined in 2001.

Uh, ummm, nevermind....
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