DSMLink Low RPM Fuel/Timing Sliders

[mnetwork]

I always wondered this, but never asked it. When does DSMLink turn to the fuel and timing sliders for use? I know global fuel and deadtime are always used, but when would the ecu use the fuel and timing sliders at say 500, 1000, and 1500 rpm?

 

[No_Skillz]

Fuel at 50hz, 150hz, and 250hz for fine tuning LTFTs and STFT.

Timing to help with spool or off-boost driving behavior.

 

[1992awdlaser]

The timing adjustments you make are always applied to the stock timing curve.

The fuel adjustments you make are only used during open loop(full throttle) mode.

 

[mnetwork]

Fuel at 50hz, 150hz, and 250hz for fine tuning LTFTs and STFT.

Timing to help with spool or off-boost driving behavior.

I don't really understand what you are saying? Are you saying that when you are getting airflow readings of 50hz, 150hz, and 250hz that the ecu turns to the 500, 1000, and 1500rpm sliders for adjustment?

And for timing, when does the ecu actually use those low end fuel sliders? All the time? Only WOT? That is my question.

 

[1992awdlaser]

I don't really understand what you are saying? Are you saying that when you are getting airflow readings of 50hz, 150hz, and 250hz that the ecu turns to the 500, 1000, and 1500rpm sliders for adjustment?

And for timing, when does the ecu actually use those low end fuel sliders? All the time? Only WOT? That is my question.

Look up one post.

 

[mnetwork]

The timing adjustments you make are always applied to the stock timing curve.

The fuel adjustments you make are only used during open loop(full throttle) mode.

Ok, so with timing. What will the effect be if I raise timing a lot a say 1000 rpm. Is that supposed to help my cruising ability off-boost?

And with fuel, that makes sense. When does a 2g enter into open loop mode again?

 

[1992awdlaser]

Ok, so with timing. What will the effect be if I raise timing a lot a say 1000 rpm. Is that supposed to help my cruising ability off-boost?

Yes, raising the timing down low will give you better off boost response. It can also help the turbo spool quicker.

And with fuel, that makes sense. When does a 2g enter into open loop mode again?

There are a few things that can make a 2G go into open loop mode. Only one of these has to be true for the ecu to go into open loop mode.

Throttle position too high (varies by RPM)
Airflow too low
Coolant temp < 51F
Coolant temp > 228F
The O2 sensor did not switch around 0.5v for over 128 seconds while running in closed loop mode. In that case, the ECU locks itself in open loop mode.

 

[mnetwork]

Yes, raising the timing down low will give you better off boost response. It can also help the turbo spool quicker.



There are a few things that can make a 2G go into open loop mode. Only one of these has to be true for the ecu to go into open loop mode.

Throttle position too high (varies by RPM)
Airflow too low
Coolant temp < 51F
Coolant temp > 228F
The O2 sensor did not switch around 0.5v for over 128 seconds while running in closed loop mode. In that case, the ECU locks itself in open loop mode.

How many clicks up do people usually go below 2500rpm? I've never tried playing with timing before boost because I didn't know it would do anything. I thought those settings only worked for open loop mode...

 

[1992awdlaser]

How many clicks up do people usually go below 2500rpm? I've never tried playing with timing before boost because I didn't know it would do anything. I thought those settings only worked for open loop mode...

If you look here you can see the stock 2G timing map. http://i90.photobucket.com/albums/k274/92awdlaser/2gtimingmap1.jpg

Just be sure to keep a smooth curve. If it was me this is what I would start out with:

1,500 2,000 2,500

+2 +4 +2

 

[mnetwork]

If you look here you can see the stock 2G timing map. http://i90.photobucket.com/albums/k274/92awdlaser/2gtimingmap1.jpg

Just be sure to keep a smooth curve. If it was me this is what I would start out with:

1,500 2,000 2,500

+2 +4 +2

What about 500 and 1k? Is there a certain amount of clicks I shouldn't be going over down there? I'm just really trying to understand this.

 

[1992awdlaser]

What about 500 and 1k? Is there a certain amount of clicks I shouldn't be going over down there? I'm just really trying to understand this.

I wouldn't worry about any of the sliders lower than 1,500 unless it is to keep a smooth curve.

Some people have their lower sliders almost maxed out. You just have to start small to make sure there is no problem caused by it. Make sure you keep a gradual curve also. I don't like for any of my sliders to be more than 3* from the ones next to it. So, let's say 4,000 is targeting 8*. I wouldn't want the 4,500 slider to target more than 11* or less than 5*. I also wouldn't want the 3,500 slider targeting outside of those numbers either.

 

[mnetwork]

I wouldn't worry about any of the sliders lower than 1,500 unless it is to keep a smooth curve.

Some people have their lower sliders almost maxed out. You just have to start small to make sure there is no problem caused by it. Make sure you keep a gradual curve also. I don't like for any of my sliders to be more than 3* from the ones next to it. So, let's say 4,000 is targeting 8*. I wouldn't want the 4,500 slider to target more than 11* or less than 5*. I also wouldn't want the 3,500 slider targeting outside of those numbers either.

Well then I have two more questions, I would like to try to get better low end through timing advance. What should I look for down there to make sure I am not causing any problems? Also, why did you choose +2 then +4 and then back down to +2?

 

[1992awdlaser]

Well then I have two more questions, I would like to try to get better low end through timing advance. What should I look for down there to make sure I am not causing any problems? Also, why did you choose +2 then +4 and then back down to +2?

Just make sure it doesn't make the car act wierd or knock. Look at the picture I posted a link to. Choosing those numbers are based off that picture. Adding 2 to the 1,500 slider will bring it up to 3*. Adding the 4* to the 2,000 slider will bring it up from -1* to 3*. And adding 2 to the 2,500 rpm slider will bring it up to 4*. These will make the curve smoother while adding better off boost response and staying safe. If those adjustments are fine then start adding more timing at the lower sliders.

 

[mnetwork]

Just make sure it doesn't make the car act wierd or knock. Look at the picture I posted a link to. Choosing those numbers are based off that picture. Adding 2 to the 1,500 slider will bring it up to 3*. Adding the 4* to the 2,000 slider will bring it up from -1* to 3*. And adding 2 to the 2,500 rpm slider will bring it up to 4*. These will make the curve smoother while adding better off boost response and staying safe. If those adjustments are fine then start adding more timing at the lower sliders.

I was looking at the map and that is what confused me. But now I see you're looking at the range that is in boost. Wouldn't this not be the case because I would be out of boost?

 

[1992awdlaser]

I was looking at the map and that is what confused me. But now I see you're looking at the range that is in boost. Wouldn't this not be the case because I would be out of boost?

I apply them based on the boost that the car runs. This is also where the DSMLink estimates come from. It's still generally a good number for the other curves. The way you are talking about is how I would do it with a stand alone. With them you can set the timing for certain boost levels instead of just one number like in dsmlink. You can change that whole graph with a stand alone which is one reason they are better but also harder to tune.

 

[mnetwork]

Good point... I'll probably adjust timing a little tonight and see how it goes...