it seems Ecutek are pushing for a full SD mod.is there any plans for full SD using ecuflash?

 

The X already has SD. The ECU uses a combination of the MAP and MAF sensors to come up with a load calculation. So it's not really needed.

The only thing needed to convert an rom over to SD would be getting rid of all the codes the ECU will throw because it would be missing its MAF sensor.

To me, it just seems silly to cut out one of the sensors.

 

If the stock ecu is using map + maf, then it is NOT speed density.

 

yes, i know it combines MAP+MAF but its not full-on SD.The main issue being the high failure rate of MAF sensors.yes id agree about removing the sensor but surely it would be worthwhile without spending $$$ every few months on MAFs

 

I feel the MAF failures are user issues. It seems the same people have MAF failures over and over, while the rest of us have no issues what so ever.

As for Speed Density, how do you define Speed Density? The X has it. Period. You didn't say you wanted MAF less car that runs Speed Density. Or a Speed Density Only car.

 

Agreed with Golden, the X ecu has speed density in a roundabout way.

That said, in the DSM/CT9A days SD was nice since it allowed you to remove a restrictive MAF (IE, you have a 4" turbo inlet and a 3" hole it has to be forced through). Since the X's hot wire can be bolted onto any size tube and re-calibrated there should be no *need* for SD until you start getting to high enough airflow that it can no longer meter it... but there's no significant restriction to leaving the MAF there for normal drivability and then using a faux SD cutover up-top via the map-maf tables.

 

For CT9A, most people wanted SD to get rid of the restrictive MAF

on EvoX you can just change the MAF housing for a bigger one, therefor its not such a big problem.

 

I feel SD has become a buzz word and people tend to lose sight of what it really is and the benefits / drawbacks.

 

Can you explain some more please?? very interested as many stock cars suffer so dont understand what user issues are causing it. Pressing the gas pedal to hard??

The 4b11 is used in other vehicles I believe and runs without MAF all togeather... it is obvious to state the Evo X switches from MAF to SD signals... eliminating the MAF will just take a complication out of the equation and not require replacment everytime one fails or you get stuck at the track in limp mode. Also you can run intake as you require without MAF compensation etc.

 

Everyone i know personally never had a problem with there MAF. The only time i heard about them failing is when people use cheap or cheaply made air filters(HKS panel filter, ..., etc) and the MAF gets all gummed up. Buy a decent intake

 

Exactly!

I would also like to comment to 2nd half of Bronco's statements.

Yes you can eliminate the MAF, but are you willing to accept all the down falls? I wouldn't want to daily drive my car without a MAF.

 

Agreed

You don't go into limp mode if you properly disable things... this would probably need to be done for going to SD anyway.

You *may* not need to change the intake if it doesn't significantly change VE, but you will have to change much more on your tune for temperature, elevation, and many other small characteristic changes.

 

The resistance to full time speed density is surprising. I'm very interested in it because it would simplify tuning high power setups. As it is now, I have been unable to properly tune the MAF and SD scaling tables because its not clear when the ECU is using MAF and when the ECU is using SD. I am aware of tephra's thread that describes to some extent how the ECU is supposed to be choosing between MAF and SD for load, but I have not found his description to reflect my tuning experience in all instances.

If anything, it would be nice to be able to temporarily disable either MAF or SD to facilitate getting the scalings dialed in.

 

What problem(s) are you running into on the higher power setups?

 

Don't want this thread to go too far off topic, but I have not seen good correspondence between changing the SD load scaling tables and observed load/AFR. Without a way to shut off either SD for MAF, a better understanding of when each of the air metering systems is used and what its used for would be helpful.