RPM Limit

[Slim47]

Faced a problem. Drift car. When the pilot depresses the clutch and then releases it to increase the engine speed, the motor has too long a ign cut. RPM drops from 7500 to 4500. And if I can control how much the base peak rises and falls, but under certain circumstances, after it there is a long residual cut of ignition, which I do not understand how to influence.

The problem only occurs in 4th gear. The first three are great. It seems to me that I have already tried all possible options, from the standard to the most exotic settings in the advanced mod  If you release the clutch before the RPM Limit, then the motor picks up quite cheerfully.

 

There is another problem, that the VQ35DE choke cannot withstand more than 55% DC. Immediately, it just crashes, on these settings it works very slowly. Although on other machines it works stably at 90-95%. Any thoughts?

[Adamw]

Can you attach a copy of your tune and the log.  The slow decay on the ignition cut doesnt look like the RPM limit to me, provided the settings above are what you have.  More likely one of the other limiters like MAP limit at the same time.  

[Slim47]

I assumed that another cutoff worked, but I did not find these events in the log. Maybe you will find something that I have not seen

 

https://cloud.mail.ru/public/bd4r/4JTatte68

https://cloud.mail.ru/public/fL9x/THViWhs5T

As an example, the file time is 4:29:00

Once again, carefully reviewing the magazine, I understand that the ECU probably perceives clutch impact as detonation, although the threshold is raised very high. I'll try lowering the RPM threshold for detecting it, although judging by the duration of the echo, I'm not sure if this will help. Nevertheless

I'm sorry to disturb you)

[Adamw]

The extended ignition cut is coming from GP RPM limit 1.  This is because it is set to the same RPM limit as the main RPM limit (7800RPM), but advanced mode is turned off so the decay time is much longer.  Decay time is 400ms when advanced mode is turned off.  

I would suggest changing the GP limit 1 of 7800RPM, to be 10000RPM for the cells where fuel pressure is acceptable, this way the main RPM limit is always the one to prevent overrev, the GP limit only kicks in when something is wrong.

In the next firmware release the limiter status and limit flag word logging has been improved so it makes it clearer which one is active and doesnt miss very short events.  

 

2 hours ago, Slim47 said:

Once again, carefully reviewing the magazine, I understand that the ECU probably perceives clutch impact as detonation, although the threshold is raised very high. I'll try lowering the RPM threshold for detecting it, although judging by the duration of the echo, I'm not sure if this will help. Nevertheless

I'm sorry to disturb you)

I dont quite understand what you are saying here - maybe the indicated knock event at high RPM?  This can be the "bang" from the limiter, or as you suggest backlash in the drivetrain/clutch plate etc.  

[Slim47]

7 hours ago, Adamw said:

The extended ignition cut is coming from GP RPM limit 1.  This is because it is set to the same RPM limit as the main RPM limit (7800RPM), but advanced mode is turned off so the decay time is much longer.  Decay time is 400ms when advanced mode is turned off.  

Adam, you helped out once again. How could I not notice this. Thanks for your help.

 

P.S. about detonation, I meant that the ignition is rolled back. That the ECU perceives clutch strikes as detonation and rolls back the ignition. I already realized that it was a false way of thinking