AEM EMS - Simple questions answered
Dec 13, 2005, 04:33 PM
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AEM EMS - Simple questions answered
In celebration of our finally getting our own engine management forum I'd like to take this opportunity to offer my (limited) knowledge of the AEM EMS 30-1312 unit. If anyone has any questions about the our application, general or Lancer specific, please feel free to post them here, and I will do my best to answer them or point you in the right direction.
For further information try the AEM Electronics Forums. All the forums in there have a lot of useful information.
For further information try the AEM Electronics Forums. All the forums in there have a lot of useful information.
Dec 13, 2005, 08:33 PM
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Ok, it's easy if you read...a LOT. It's NOT something I'd recommend doing from the basemap provided. You could probably get the car to idle and start, but the first tune is best to have done professionally. Then save it somewhere safe (like on a CD, floppy or whatever), and you could maybe tinker a little from there. I wouldn't recommend making major changes or making ANY changes that you're not 100% certain about. The interface is pretty easy to understand (I think you can download it for free from their forums and install it on any PC), but keep in mind you literally have to tune EVERYTHING. From fuel pump, fuel map, to spark maps to accel and decel trims, to fuel cut, to AC compensation etc. IMO, it's a great tool, but one that can do a lot of damage if you're not careful with it.
Oh, and make sure the car runs well otherwise. Part of my problem with my car was that it was so impossible to troubleshoot because I had (and may still very well have) some mechanical problems on top of the standalone.
Oh, and make sure the car runs well otherwise. Part of my problem with my car was that it was so impossible to troubleshoot because I had (and may still very well have) some mechanical problems on top of the standalone.
Dec 13, 2005, 08:39 PM
#4
reading a lot is a must. the AEM forum is likely the best source of info for that.
do you think they offer a web course on getting certified? i think i will call them when i order my EMS in the spring and try to get some sort of schooling on it.
the base tune will be way over my head though. what you said about saving that and then tinkering with it would be a good learning experience ( so long as i don't play to much )....cool stuff, thanks for the good info.
do you think they offer a web course on getting certified? i think i will call them when i order my EMS in the spring and try to get some sort of schooling on it.
the base tune will be way over my head though. what you said about saving that and then tinkering with it would be a good learning experience ( so long as i don't play to much )....cool stuff, thanks for the good info.
Dec 13, 2005, 08:40 PM
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They only offer certification classes in their facility in CA. You got the idea, mang. BTW, I say this because I know you already know your **** pretty well (if not better than me), and so tuning wouldn't be beyond your understanding. It should be clearly understood that standalones are not for nublets.
Dec 14, 2005, 01:23 PM
#6
Originally Posted by HobieKopek
BTW, I say this because I know you already know your **** pretty well (if not better than me), and so tuning wouldn't be beyond your understanding.
i really appreciate that. you're still the guru though
but that makes me feel better about myself.
Dec 14, 2005, 04:53 PM
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Credit given where credit is due. I always say standalones aren't for everyone, but 1. you know your **** and 2. there's at least 1 shop that's AEM certified within an hour or so of where you live.
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Dec 14, 2005, 05:53 PM
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What is the biggest problem with a standalone engine managment?
Or should I say,
what could cause the most problems?
first problems?
And how much could a reputable shop charge for a nice setup with AEM EMS?
Or should I say,
what could cause the most problems?
first problems?
And how much could a reputable shop charge for a nice setup with AEM EMS?
Dec 15, 2005, 07:33 AM
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I asked because I thought there were some problems with Andrew's tune and my concern was how much he thinks it would cost to get it running PROPERLY.
Many shops can offer prices but a lot of times you end up paying more because every car is different.
Is EMS capable of self learning? Or do you have to retune it everytime you change something?
I'm not really looking at AEM EMS bu at RPW's Haltech.
Many shops can offer prices but a lot of times you end up paying more because every car is different.
Is EMS capable of self learning? Or do you have to retune it everytime you change something?
I'm not really looking at AEM EMS bu at RPW's Haltech.
Dec 15, 2005, 07:52 AM
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My problems were mechanical. At least not ECU related. At first I blamed them (wrongly) on the EMS, but once Mark tuned it and we realized the problems I was having with fuel delivery I realized that it had to be something other than just the tune. The EMS can learn. It has both open and closed loop functions as well as automapping. I have no idea how the Haltech standalone works because I've never seen one. I'm guessing it has similar capabilities, but I'm probably not the person to ask about anything specific to that unit.
Last edited by HobieKopek; Dec 15, 2005 at 07:54 AM.
Jan 13, 2006, 11:26 AM
#14
I think I read some time ago that 12.7:1 was the ideal A/F ratio for the 4G94. Is that correct. Can't find the thread I saw it in 
And for people with little to no knowledge of A/F ratio:
Lower than 14.7:1 = Richer
14.7:1 = Stoich
Higher than 14.7:1 = Leaner
Why? Noticed how we write A/F... First number is the quantity of air, 2nd number is the fuel quantity. So 14.7 parts of air for 1 part fuel is Stoich. 12.7 parts of air for 1 part of fuel is richer because we have less air for the same fuel quantity.
And for people with little to no knowledge of A/F ratio:
Lower than 14.7:1 = Richer
14.7:1 = Stoich
Higher than 14.7:1 = Leaner
Why? Noticed how we write A/F... First number is the quantity of air, 2nd number is the fuel quantity. So 14.7 parts of air for 1 part fuel is Stoich. 12.7 parts of air for 1 part of fuel is richer because we have less air for the same fuel quantity.
Last edited by blaze_125; Jan 13, 2006 at 11:29 AM.
