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Old 08-23-2004, 06:00 PM   #1
0db
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Talking Up and running on the AEM EMS



I've used it in the past, when they first were released on my turbo Integra, and I really liked the system. It's a bit overwhelming to have so much flexibility, but it works very well.

Today I got the AEM plugged into my "Stage 2-ish" WRX and fired up their MAP-based base map (say that 3 times fast). Started right up, idled smooth, felt good, so I took it out for a drive. Basically it feels exactly like stock but pulls better up top and doesn't have ANY of the stumbling/hesitation that I've gotten used to. So far so good!

Wideband says I'm at 12:1 at cruise / idle, and 9.8:1 at full boost, so I know I can tweak some more power out of this map but it's good to feel safe with the starting values.

The timing was tuned on CA 91 octane, supposedly their tuner put it to what he felt was safe and then pulled 2-3 degrees off everything to add some margin, so I feel pretty comfortable there too.

It's boosting a solid 15 psi on my gauge, which surely accounts for some of the additional quickness I'm feeling, but the boost control is very stable at this value. I probably won't mess with it until I put the 20G in.

All in all, VERY pleasant system. I'll set up automapping tonight or tomorrow and drive it until it's where i'd like (14:1 at least at cruise/idle and start with 10.5:1 at full boost).

I haven't seen many people having any experience with the AEM so I figured I need to represent up in here!
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Old 08-23-2004, 08:37 PM   #2
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how does it connect?
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Old 08-23-2004, 11:27 PM   #3
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whos stage 2 is that compaiable to
vishnu stage 2
turbo xs stage 2
cobb stage 2

they are VERY differnt
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Old 08-24-2004, 08:17 AM   #4
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sounds like a txs stg2.

0db, just so you know, you should idle/cruise around 14.7. no need to waste extra gas for nothing.

10.5:1 is a little rich, even at full boost, also. 10.9 in the midrange and 11.0-11.1 up top should be safe.

what the timing like?
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Old 08-24-2004, 11:22 AM   #5
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On the hardware side, my car has a gutted stock uppipe, and an APS 3" turboback with one high-flow cat. I compare it to a stage 2 since i have a buddy with a Cobb stg2 reflash and he has basically the same mods.

The AEM matches the factory ECU plug, so you unplug the ECU, and plug the wiring harness straight into the AEM.

I know I'm shooting for a little rich, but I'm stuck with CA gas so I figured I'd be conservative up top. I know I can stretch it out to 14.7 at idle/cruise but I want to keep a margin until I see some datalogs and know that it isn't leaning out on accel or anything.

In about 2 minutes of tuning on the way home from work I got it out to about 10.5:1 anywhere above 7 psi, and about 13.5:1 at cruise. Shouldn't take much more work to clean that up. (boost compensation mapping is REALLY easy to work with, even if it's poorly documented!)


Timing on the base map is around 12 deg at full vac across the board, 15-33 at atmospheric (15 at 500 rpm, 33 at 7500) and 5-20 deg at 16 psi. I'd be interested in comparing this to what others are running!
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Old 08-24-2004, 12:53 PM   #6
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That timing map needs some serious work.

C
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Old 08-24-2004, 01:23 PM   #7
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I have no frame of reference, this is my first tuning work on the WRX. I don't even know what the stock timing map looks like. The engine runs smooth as stock, pulls as well if not better, and not a hint of detonation so I wasn't too worried, but I would LOVE to get some feedback on what works well for this engine!
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Old 08-24-2004, 02:17 PM   #8
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Quote:
Originally Posted by AZScoobie
That timing map needs some serious work.

C
i was thinking the same thing.
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Old 08-24-2004, 02:19 PM   #9
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Seriously, if I could at least see a stock ignition map it would be helpful. All I can find is UTEC info which doesn't do any good without a starting frame of reference.
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Old 08-24-2004, 02:20 PM   #10
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I've got the map in Excel or an HTML table format, is there any way I can post the whole thing up so you guys can look at it?
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Old 08-24-2004, 02:24 PM   #11
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Just download a TXS stage 2 basemap for the UTEC and look at the timing in UTECEdit or just notepad.
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Old 08-24-2004, 03:33 PM   #12
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WOW, holy crap, the TXS stage 2 map is really drastically different from the AEM. Especially the low-load timing. I'll try plugging in similar values to the TXS and see how she runs.
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Old 08-24-2004, 03:41 PM   #13
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Consider that the Utec maps 0 column is set to ECU so the factory ECu is in control.. That means this map you are looking at is:

1. Only active past 60% TPS.
2. Is really a crappy map to start with
3. Has not enough advance in the lower load columns
4. Has way to much advance in the higher load ranges (for 91 cali pump)

I have some Link ECU maps that I tuned(link is Speed density). But you need the Link software to open and view them.

Clark
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Old 08-24-2004, 07:45 PM   #14
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Quote:
Originally Posted by AZScoobie
Consider that the Utec maps 0 column is set to ECU so the factory ECu is in control.. That means this map you are looking at is:

1. Only active past 60% TPS.
2. Is really a crappy map to start with
3. Has not enough advance in the lower load columns
4. Has way to much advance in the higher load ranges (for 91 cali pump)

I have some Link ECU maps that I tuned(link is Speed density). But you need the Link software to open and view them.

Clark
I thought it looked pretty damned aggressive up top and way too simplistic everywhere else.

I just downloaded the PCLink software from their website, will that let me view your stuff? That's very generous of you to share.
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Old 08-24-2004, 07:51 PM   #15
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Email me C_turner@ix.netcom.com and I will shoot you a map.

C
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Old 08-25-2004, 12:20 AM   #16
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emailed, thanks!
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Old 08-25-2004, 09:40 AM   #17
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This is why this place is so good! If only there was more sharing of information and less bickering!
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Old 08-25-2004, 02:40 PM   #18
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Yeah, I think these conversations are a lot more positive than 4 pages of bickering about FMICs vs TMICs.
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Old 08-26-2004, 03:01 PM   #19
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I have personally worked with the EMS and the EMS department is really good friends of mine over at AEM. The timing map if anyone was curious is basically the stock map tweaked a little bit. They do a lot of datalogging on the stock ECU through the OBDII port and make the timing map off of that. They plot all the information out and use that as a starting point. So all in all your timing map is not gonna be that far off. Just a few degrees for margin and up top higher boost you may need to trim up.
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Old 08-26-2004, 03:06 PM   #20
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That's good to know. Of course I imagine the stock timing is drastically altered by the "learning" ECU, so what they pull from a live OBD port might be very different from car to car. Not that it's a good or bad thing... just thinking about how that might affect things. Overall the car feels pretty good, and it fires up nice and easy every time (albeit with the additional bit of cranking all standalones seem to need for syncing).
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Old 08-26-2004, 03:54 PM   #21
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I downloaded the AEM EMS software a few months ago and noticed it had auto tune. Have you used the auto tune feature? If so, does it work well? I'm glad to see people posting about the AEM. It doesn't seem like many subie guys are using the AEM. The Last time I checked their forums there wasn't much info the wrx. It's been awhile so it might be different now.
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Old 08-26-2004, 04:09 PM   #22
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Quote:
Originally Posted by rtype16
I have personally worked with the EMS and the EMS department is really good friends of mine over at AEM. The timing map if anyone was curious is basically the stock map tweaked a little bit. They do a lot of datalogging on the stock ECU through the OBDII port and make the timing map off of that. They plot all the information out and use that as a starting point. So all in all your timing map is not gonna be that far off. Just a few degrees for margin and up top higher boost you may need to trim up.

Yikes... The Factory ECU has the authority to adjust 10 degrees in most places. Somtimes more, sometimes less. Its an active system.....

C
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Old 08-26-2004, 06:07 PM   #23
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Quote:
Originally Posted by CK02WRX
I downloaded the AEM EMS software a few months ago and noticed it had auto tune. Have you used the auto tune feature? If so, does it work well? I'm glad to see people posting about the AEM. It doesn't seem like many subie guys are using the AEM. The Last time I checked their forums there wasn't much info the wrx. It's been awhile so it might be different now.

I used it extensively on my Integra, in its early days, and it worked great. I was within 0.1 AFR of my target ratio everywhere on the map after about an hour worth of driving around. I haven't messed with it on the WRX yet because I'll be changing everything pretty soon (new turbo, IC, fuel setup, etc.).

I think it's a great system; AEM kinda dropped the ball getting it out so late because now it seems that everyone's completely set on the Hydra which pretty much came up out of nowhere. I went with the AEM because i've used it before, they've had a good amount of time to get the bugs out and add interesting new features. Plus I'm working on an EVO and we could run the AEM on both and really cut down my learning curve.
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Old 08-26-2004, 06:08 PM   #24
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Quote:
Originally Posted by AZScoobie
Email me C_turner@ix.netcom.com and I will shoot you a map.

C

Did you get either of my emails?
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Old 08-27-2004, 07:03 PM   #25
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yeah.. Been busy. Let me send those files ova...

C
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