E-Manage V. EMS
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Joined: Oct 2003
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From: NOVA/Rye,NY/Tempe AZ
E-Manage V. EMS
I Couldn't find anything directy comparing them in the search function. I was wondering what are the pros and cons of each and why would one go with one over the other from all of you with expeirience on one or both of these feedback would be much apreciated on them.
Thanks in advance,
-Matt
Thanks in advance,
-Matt
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Joined: Oct 2000
Posts: 30,809
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From: Sydney
First, the major difference is that the AEM EMS (I assume that is what you refer to) replaces the stock ECU, whilst the E-manage piggy backs onto the loom to the stock ECU and intercepts some signals and taps into others.
What this means is that the AEM requires a lot more setting up. It does come with some very basic maps that should get you running. It can emulate almost all of the stock ECU's functions, but one thing it doesn't do is drive the water temp gauge.
The benefits are that it's not limited by any of the assumptions made by the stock ECU. It has no problem with boost and can add fuel with any size injectors. It has an amazing array of functions that I won't go into because they are too numerous, and I don't know them well enough!
The E-manage is pretty easy to get going because if you've configured it's jumpers and dials for our engine, and wired it in correctly (I strongly advise a FROGTECH P'n'P harness) and left all the other settings as 0 then it won't interfere with the stock ECU or signals and your car will run just as it did before installing the E-manage.
The E-manage removes fuel by tricking the ECU into thinking there is less air going in (just like a V-AFC). This is not a great way of tuning but works OK in mild situations. If you try to pull fuel and the car runs lean then the ECU will see this when it's in closed loop mode and add fuel. When you go WOT the ECU drops out of closed loop and you will be running lean.
The nice thing about the E-manage in FI applications is that it adds fuel properly by directly holding the injectors open longer rather than by tricking the ECU into thinking there is more air. And it has a MAP Limit function too so it can hide boost from the ECU.
It can also add or subtract timing from whatever the ECU is running at the time but this is fairly rough and inaccurate.
In summary, the AEM is the ducks guts but is three times the price of the E-manage. I would say that if the E-manage does what you require then go for it. If you find it doesn't and you are cutting corners, then the AEM is the only way to go.
By way of references, I'm currently running an E-manage but am saving the bikkies for an AEM.
What this means is that the AEM requires a lot more setting up. It does come with some very basic maps that should get you running. It can emulate almost all of the stock ECU's functions, but one thing it doesn't do is drive the water temp gauge.
The benefits are that it's not limited by any of the assumptions made by the stock ECU. It has no problem with boost and can add fuel with any size injectors. It has an amazing array of functions that I won't go into because they are too numerous, and I don't know them well enough!
The E-manage is pretty easy to get going because if you've configured it's jumpers and dials for our engine, and wired it in correctly (I strongly advise a FROGTECH P'n'P harness) and left all the other settings as 0 then it won't interfere with the stock ECU or signals and your car will run just as it did before installing the E-manage.
The E-manage removes fuel by tricking the ECU into thinking there is less air going in (just like a V-AFC). This is not a great way of tuning but works OK in mild situations. If you try to pull fuel and the car runs lean then the ECU will see this when it's in closed loop mode and add fuel. When you go WOT the ECU drops out of closed loop and you will be running lean.
The nice thing about the E-manage in FI applications is that it adds fuel properly by directly holding the injectors open longer rather than by tricking the ECU into thinking there is more air. And it has a MAP Limit function too so it can hide boost from the ECU.
It can also add or subtract timing from whatever the ECU is running at the time but this is fairly rough and inaccurate.
In summary, the AEM is the ducks guts but is three times the price of the E-manage. I would say that if the E-manage does what you require then go for it. If you find it doesn't and you are cutting corners, then the AEM is the only way to go.
By way of references, I'm currently running an E-manage but am saving the bikkies for an AEM.
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Joined: Aug 2001
Posts: 349
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From: Kansas City
I will say though, that the Greddy E-Manage does its job. For basic tuning, I think it's perfect. However, when you start to go a little further than the average joe shmoe, it'd be a good idea to upgrade to the EMS...hell, the damn thing controls just about everything, only problem is, is that it needs to be "taught" to do anything.
I trust you are being humourous.