EcuTek SEMA Event Program

[Shiv@Openflash]

Just curious as to why anyone would prefer speed density over MAF referencing on this platform?

[SmsAlSuwaidi]

Originally Posted by shiv@vishnu

Just curious as to why anyone would prefer speed density over MAF referencing on this platform?

Isn't it better or ideal if you're running high boost ?

[King Tut]

Originally Posted by shiv@vishnu

Just curious as to why anyone would prefer speed density over MAF referencing on this platform?

Depending on how much boost you are running you might not have enough resolution for the loads the MAF reads. If you have to extend to the higher loads then you have to lose on the lower loads and driveability area. I prefer speed density from my Honda Uberdata tuning days personally. No worries of making sure the MAF sensor is happy and seeing correct air flow under all conditions.

[Shiv@Openflash]

Originally Posted by King Tut

Depending on how much boost you are running you might not have enough resolution for the loads the MAF reads. If you have to extend to the higher loads then you have to lose on the lower loads and driveability area. I prefer speed density from my Honda Uberdata tuning days personally. No worries of making sure the MAF sensor is happy and seeing correct air flow under all conditions.

You can always have enough resolution with a MAF by adjusting the MAF tube diameter. And you still are left with a load referencing system that measures airflow instead of estimating it. The days when speed density were preferred by tuners were back when MAFs incorporated restrictive flapper door type airflow sensors. In those cases, moving to speed density increased power and was worth the potential drivability drawbacks and tuning difficulties.

For a car that runs open loop fuel control under load, I'd take a MAF based system over speed density any day. NA or boosted.

Shiv

[King Tut]

Originally Posted by shiv@vishnu

You can always have enough resolution with a MAF by adjusting the MAF tube diameter. And you still are left with a load referencing system that measures airflow instead of estimating it. The days when speed density were preferred by tuners were back when MAFs incorporated restrictive flapper door type airflow sensors. In those cases, moving to speed density increased power and was worth the potential drivability drawbacks and tuning difficulties.

Regardless of MAF tube size you have X many columns for load and as you increase boost the MAF scaling has to be changed to account for that higher load. You still only have X many columns and that means each of the columns now refers to a larger area of load. As mentioned it is a resolution issue and the number of columns in the OEM ECU is the limiting factor. There is no guarantee that a speed density tune with X amount of vacuum/boost columns will work any better though, I will give you that.

[qoncept]

It would be much easier to increase the resolution of a table than to implement full speed density tuning. From both engineering and tuning perspectives.

[Shiv@Openflash]

Originally Posted by King Tut

Regardless of MAF tube size you have X many columns for load and as you increase boost the MAF scaling has to be changed to account for that higher load. You still only have X many columns and that means each of the columns now refers to a larger area of load. As mentioned it is a resolution issue and the number of columns in the OEM ECU is the limiting factor. There is no guarantee that a speed density tune with X amount of vacuum/boost columns will work any better though, I will give you that.

What you described (fixed map resolution with bigger load range) applies to speed density systems too. In fact, speed density systems suffer more in such situation.

[King Tut]

Originally Posted by shiv@vishnu

What you described (fixed map resolution with bigger load range) applies to speed density systems too. In fact, speed density systems suffer more in such situation.

Which is why I mentioned that in my post. I have never seen the EcuTek adaptation but because it is custom programmed my guess is that it is not a fixed map resolution or is at least a much larger resolution speed density system.

[Circuit Motorsports]

Originally Posted by Scooby South

I am hoping for SPEED DENSITY Tuning.. We'll see. been scouring Press-Releases.. Nothing yet.. Supposed to be a big announcement from NAMELESS as well.

Bill

EcuTek has had speed density tuning for the 86 platform for quite some time now. Also supports hybrid speed density tuning (MAF/SD, SD/MAF). Great flexibility.

Originally Posted by King Tut

Which is why I mentioned that in my post. I have never seen the EcuTek adaptation but because it is custom programmed my guess is that it is not a fixed map resolution or is at least a much larger resolution speed density system.

The resolution of the speed density map is 30x24 and is completely scalable.

[ecko04]

So...back to the topic, what's the announcement?

[j.F.c.R.a.S]

Originally Posted by ecko04

So...back to the topic, what's the announcement?

???


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[Scooby South]

My understanding is that the MAF range on the 86 is limited without going to speed density. Is that not true???

[pixel67]

Originally Posted by ecko04

So...back to the topic, what's the announcement?

Well, maybe they are going to announce how to fail at announcements.

Sent from my Nexus 7 using Tapatalk

[Shiv@Openflash]

Originally Posted by Scooby South

My understanding is that the MAF range on the 86 is limited without going to speed density. Is that not true???

Not exactly. MAF range is limited by the combination of the MAF sensor element and the diameter of the MAF housing. Keeping the MAF sensor element constant, you can increase the maximum range by simply increasing the diameter of the housing and modifying the MAF calibration table to compensate.