^it stands for speed density. Basically you have a sensor that takes the temp of the air, with a map sensor that measures pressure in the intake manifold, compared to a maf, which meters air going through the honey combs, which is heated
https://www.evolutionm.net/forums/ma...w-through.html

 

does speed density work with a stock ecu?

 

and im having problems with stalling, when i release the gas sometimes the car stalls and with the a/c on it does that every time,should i just up the rpms which is a 1000 at idle to 1200 or do i have to do something else to tackle the stalling issue?

 

SD will work on the stock ECU, and it will fix your low idle problems.
It will smooth it out and the great thing about SD, is that if you blow a IC pipe off your car won't die.

 

wow you just sold me!..who has the best SD kit?

and still can anyone help me with my idle problems?

 

SD is speed density. You remove the maf and use a 4bar sensor and air temp sensor to measure air intake. Some people also use the fuel temp sensor instead of an air temp sensor.

 

Yep, speed density will work on Stock ECU. 95% of the evo community that is on SD is using the stock ecu

You will prob have to go into your idle tables under ISCV ac on and idle rpm off drive.

Mikey

 

How simple is it to do the conversion (finding a map sensor and adjusting the ecu)?
Also would I have to retune the car?

 

Yes you would need a retune

 

The silicone coupler on my 3.5" intake rubs my tranny a bit. I would assume a 4" ones even more. Anyone confirm?

 

I don't have a problem on my car with the 5speed... Do you have like a 10ply coupler? lol

The 4" is close to the tranny but not touching.

Mikey

 

I dont have that problem with my 3.5" intake

 

Could be a 6-speed thing too. Thanks for the input guys! And LOL @ Mikey.. na its just a 3-ply actually, kinda puny. I'll know how it fits on a 5-speed when I get enough saved for one