AEM ams

[Hoffer00]

What would I need if I wanted to run with the Ems. I would like to be able to shop tune or personally tune. '99 gsx, 5sp

[blageo23]

Plug and play. Or if you wanna be sweet and do speed density you will need an IAT and a MAP sensor, either GM or AEM.

[FattyBoomBatty]

Intake air temp sensor should be the non-brass kind, I think. They can't read changes fast enough for turbo engines. I don't know what to ask for when you go to a parts store though.

[blageo23]

I did a little writeup for the EMS a few months ago...http://www.dsmtuners.com/forums/showthread.php?t=237709
All the part numbers you need and how to hook the stuff up.

[tim]

Plug and play. Or if you wanna be sweet and do speed density you will need an IAT and a MAP sensor, either GM or AEM.

I agree with this guy.

If you arent familiar with an EMS I would suggest a tune with someone that knows what they are doing; Shane, Josh, Steve, etc..

After that, check out the AEM forums and ask a lot of questions before you tinker with it yourself. There are a few tables that will seem simple but there are many more that need a lot more knowledge than the average guy/gal to have function properly.

AEM is the cream of the crop for 99.9% of DSMs, but it does take a bit of knowledge.

[scheides]

Does AEM EMS use the stock o2 sensors at all? I was talking to shane about this and he said that if the car doesn't have a wideband, it could be tuned on the MAP/IAT sensors alone (using the shop's wideband). Sure you can get a Innovative LC-1 for $200, but is it needed if a shop w/ a wideband will be doing all of your tuning?

Anyone have any comments on this?

[Shane@DBPerformance]

The last thing you want to do it try to tune an AEM with a MAS on the car, it really sucks. Pretty much you goto speed density with the AEM.

The AEM doesn't use the stock O2 sensors at all. You tune the fuel maps the best you can to get the desired A/F ratio for every load cell in the fuel map, even ones you haven't or can't reach. There are modifier tables for things like coolant temp and air temp, but even if you have those tuned perfect, cars don't run exactly the same from day to day with different weather conditions, different tanks of gas, deterorating parts, etc.

You can hook the output from most widebands into the AEM or buy one with an integrated wideband. Then you can just have it in your logging, or have it actively perform O2 feedback corrections similar to a factory car. There are also some "autotune" features that can be used with a wideband, but they are mostly a waste of time. With O2 feedback and a wideband, you aren't limited to only shooting for a 14.7:1 A/F ratio like a factory narrowband car does. You can run it much lean under cruising loads to try to save gas. You can also use it under boost to adjust fueling, but you have to be very careful, you don't want a bad O2 sensor, burned through wire or malfuctioning wideband controller all of a sudden causing an unneeded and incorrect change in fueling.

[niterydr]

I would highly recommend adding an AIT and map sensor to the EMS.
Sticking with the factory MAS will hinder the performance of the vehicle, and make it a huge pita to tune (like shane mentioned).