Håvard Karlsen Posted May 21, 2023 Report Share Posted May 21, 2023 Hello, i have turbo snowmobile using Link G+. It does not have any speedsensors. My question is- can i set up a table, so when i let go of the launch button, the engine will gradually increase rpm. So i can adjust it in rpm vs second. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2023 Report Share Posted May 22, 2023 Example Below. Example below. Launch button is DI3. DI3 is used to activate/reset a timer. Set up a virtual aux with a condition timer < 8.00s, we will use this virtual aux to activate launch control (the timer will only be <8s when your finger is on the button and for 8s after you let go). Set launch control to 3D mode, with virtual aux 1 as the activation control. Put timer 1 on one axis of the 3D launch table, this will vary your launch RPM limit based on time after launch. TTP and Håvard Karlsen 1 1 Quote Link to comment Share on other sites More sharing options...
Håvard Karlsen Posted May 22, 2023 Author Report Share Posted May 22, 2023 Is the rpm numbers in that table just random numbers, or why do they start high and go down? Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2023 Report Share Posted May 22, 2023 This is just a random made up example, but it is a quite normal trend for road racing, I have no idea how things work in snow. But the general idea in cars is there is an ideal amount of slip that will give best acceleration (not zero slip). It is much easier to start off with too much slip, then quickly pull the RPM down to achieve the ideal slip, than it is to start off with too little slip, and then somehow try to invoke an increase in slip. Håvard Karlsen 1 Quote Link to comment Share on other sites More sharing options...
Håvard Karlsen Posted May 22, 2023 Author Report Share Posted May 22, 2023 1 hour ago, Adamw said: This is just a random made up example, but it is a quite normal trend for road racing, I have no idea how things work in snow. But the general idea in cars is there is an ideal amount of slip that will give best acceleration (not zero slip). It is much easier to start off with too much slip, then quickly pull the RPM down to achieve the ideal slip, than it is to start off with too little slip, and then somehow try to invoke an increase in slip. Will it work with jump to 8000 first, and so down to 5000-6000 and so up again? Is that what you mean? Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2023 Report Share Posted May 22, 2023 You are not "jumping to 8000", this is the RPM that the engine will be held at on the start line and for maybe the first 2 wheel rotations, then you quickly reduce that down to the slip value that gives you the best acceleration. Once you have the slip under control and the vehicle accelerating, then you ramp the RPM back up to your normal RPM limit. Håvard Karlsen 1 Quote Link to comment Share on other sites More sharing options...
Håvard Karlsen Posted April 29 Author Report Share Posted April 29 Hello again. Will the "disarming speed" be a problem? I do not have wheel speed sensors.. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 30 Report Share Posted April 30 You can set it to zero to ignore the disarm speed. Without a disarming speed the launch limiter will stay in effect until the timer or other conditions that you have in virtual aux 1 expire. Håvard Karlsen 1 Quote Link to comment Share on other sites More sharing options...
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