I notice lots of 8 & 9s running SD on stock ECU. Is this possible on a X? I imagine converting a X would be no different than a 8 or 9. Anybody running SD?

 

Every single X ever manufactured is running Speed Density.

 

??? Really???
I'm pretty sure I got a MAF sensor somewhere in front of the turbo. You're X did not come factory with MAF?

 

^^^ what golden said

Evo x runs off of MAF and MAP.


Ecu engine parameters runs off of MAF calculations and MAP calculations... otherwise commonly known as speed density.

 

Yep, if you blow an intercooler pipe off the car still runs. It's more of a hybrid system, you still need both to run correctly.

 

Nope...you can run only MAF or only MAP seperately, or both together...all depends on how the car is tuned. With that said, yes, you still need both functioning properly and on the car... e.g. you can't just get rid of the MAF sensor if running MAP only.

 

I'm going with what Scott said here.

U can run either/or, but needs to have both to run efficiently. The X comes with a factory 3-bar map sensor. Aftermarket SD r 5-bar map sensors. U can run MAF on low rpm and switch to MAP on higher rpm. The crossover is smooth as long as the tune is smooth.

 

Using the MAF sensor for all vacuum through 4-8 psi and using the MAP for the rest of a pull is becoming more and more common with tuners.

 

Sounds interesting. Do they adjust the 3x MAF tables or is there another way to adjust the cross over elegantly?

 

It's possible to run purely SD, in fact I am working on it with a car right now

 

Hey, u guys coming back to Vegas anytime soon?

As for purely running SD, do u have to change the map sensor? I believe the evo x map sensor is only 3-bar, or was it 4-bar?

 

I am not tuner and can be completely wrong, but i think you can adjust the 3 MAF tables to 0 in the area that you want the MAP sensor to be used. If you want to tune the MAP tables, you adjust the MAF tables to 0 in the areas you wanna tune. Since air flow (volts) is related to load. Then when you are done tuning, take the MAF tables back to what they were.

 

https://www.evolutionm.net/forums/ev...l#post10600207

 

Anyone able to confirm this? I'd love to run mine just off the MAP and avoid the MAF and scaling stuff.

 

No need to change the MAP...the stock is a 3 BAR MAP which, technically means it'll read 29psi, but in reality ours will read up to ~33psi boost.

The ECU chooses the lowest calculation between MAP/MAF to determine Load, so if you want to run MAP only, you need to max out the MAF table. Setting the MAF table to zero won't allow the engine to run, since it'll be choosing zero as the Load.