Launch by time

This section is dedicated to discussion of DTA engine control units such as the DTA E48 EXP, P8 Pro, DTA S40, S60, S80, and S100, as well as all things ECU related.
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: Launch by time

Post by Rob Stevens »

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Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: Launch by time

Post by Rob Stevens »

but why do you need launch by time if you are allowed a wheel speed sensor? Just use normal launch.
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: Launch by time

Post by Alex DTA »

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stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Launch by time

Post by stevieturbo »

Rob Stevens wrote:but why do you need launch by time if you are allowed a wheel speed sensor? Just use normal launch.
Because the current launch by speed isnt flexible enough because its only offering a fixed slip rate which is not sufficient.

A workaround would be using a baseline rpm ramp which in this case is rpm vs time.

As said, a programmable rpm/speed/slip target throughout launch would be better as well as a programmable boost ramp during launch, although this can be trickier to maintain as there would be a lot of cuts during the launch period. But it can be done.

Also, for vehicles with a speed sensor, having launch automatically activate say below 2mph and over 40% throttle ( variables ) is easier as the driver doesnt have to remember to do anything, or press any buttons.
And launch strategy should also de-activate should throttle drop below a threshold or say the clutch/shift is activated.

Just in case say it bogs and you try to get it going again, so you arent forced to run out the duration of a pre-programmed launch period.
rocar
Posts: 107
Joined: Sat Sep 10, 2011 8:20 am

Re: Launch by time

Post by rocar »

Tried and tested Launch Control by Elapsed time,.
I filled all RPM ,Time and pot volts , Launch button press and you can see on screen that it's activated to the initial RPM. Hit accelarator and Engime holds on limit.
But as button is released you can see Real time values working but engine won't limit. ie Engine is not reponding the Rpm values you see at Real time values
rxman
Posts: 2
Joined: Tue Sep 08, 2020 3:21 am
ECU Model: S60 Pro
Firmware Version: 89.00

Re: Launch by time

Post by rxman »

I have the same problem.
As soon as the button is released, the speed goes into the normal rpm limiter while the realtime values show the desired values. The switch light also flashes as long as the program (5 sec) is active as desired.
Changes of the startlinerpm with the potentiometer works correct.
Is there a solution for this ?

LaunchControlSettings:
Launch on: check
Shiftlight flash when active: check
set Lauch RPM with Poti: Check
Activate Launch by elapsed by Time: Check
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: Launch by time

Post by Alex DTA »

Make sure the Minimum RPM is lower than the values you have in launch by time.
rxman
Posts: 2
Joined: Tue Sep 08, 2020 3:21 am
ECU Model: S60 Pro
Firmware Version: 89.00

Re: Launch by time

Post by rxman »

is working now, Cutpattern was required
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