A search revealed limited information about the EMS's ability to rapidly compensate to atmospheric conditions. Little help!
Considering a switch from my VAFC II to EMS for my SC setup...got a couple questions:

1. I live near Washington, DC. We get some serious temperature/humidity swings in the Fall and Spring. It can be 80 degrees one day and 35 degrees a day or two later (literally). Does the EMS have the ability to compensate for the cooler/denser air for an FI application (I am Comptech SC'd running stock but would like to bump that up).

2. Do you guys typically get your cars tuned in Spring and in Fall for the cooler or hotter months?

Thanks very much!

Jorge

 

The is an IAT sensor that would usually be in the inputs available. Since the S2000 is MAP based, it would need this separate input to deal with these changes you describe. (Shit - at least I hope so).

Coolant temp is also a factor, and why stock cars will run a higher idle until the coolant warms a bit - the computers senses the higher coolant temp as well.

You would want to be able to tune FOR these spring and fall months, though if done right, it should need to be done AGAIN. The tuned map would have cells already tuned (if the tune was done) for A Friday night in October that got down to 35degrees, or a crazy Spring morning that shot to to 70 from the previous says 55.

 

I will be having Inline do the tuning. Is there a way to have them do this once and get it over with or will additional dyno time be needed as conditions change throughout the year to teach the ECU? Thanks!

 

how are you using the afc for tuning now?

 

I got my tune on a very cold and dry February day...

I ran it through the cold weather and ran it through the summer and am still running it... everything seemed fine to me with my tune.

 

Naveed, thanks man. That's actually a relief.
JDM, I have 550cc injectors and I had planned on running a 3.75" pulley on my Comptech setup with these running on the VAFC II. Vtec has been dropped to 5200rpm and fuel has been added. Lately, my Vtec has been jumping around and I believe I am losing my tune. I am sick of paying for dyno time to correct the VAFC II not holding it's tune (probably due to an incorrect install) and I think I'm just going to go with the superior solution for peace of mind.

 

At this point I am repeating info, but I thought I read that VAFC loses its tune and you need to reset the computer (OEM) once in a while?

 

I remember reading/hearing the same thing

 

I had never been told that...I'll do that! Thanks man! I went through my VAFC settings and they appear good. I've done a couple MAP whacks which have cleared up some silly issues. I am doing a track day tomorrow so I'll throw a little 100 octane in the tank for safety and I'm gonna have at it. I really wish I was running that pulley because my buddy with a built E36 M3 is talkin' smack.