Hello & forgive me in advance if I've posted this in the wrong section.

Saturday (8th Apr) - Tuesday (11th Apr) Mated the short block to the head, hooked up the trany, wiring, hoses and fuel rails.

Wednesday (12th Apr) / Thursday (13th Apr) Got the EMS, External UEGO / Gage, O2 Sensor, and power relays installed and working 100%.

Friday morning (14 Apr) Installed the EMS's firmware update (v1.19), as well as the calibration file installed.

Since then, I've had nothing but problems with how the EMS is set up... BTW, I have a base map from Torquefreaks, and suposedly this map should be enough to get the car started to build up and E-mail in my data logs. (Online tuning) The thing is that I am several hours ahead of them, and because of this, my autoshop is closed when Torques freaks is opens!

I'm hoping that someone out there can help resolve a few problems, and share some of their EMS tuning wisdom with me.

Issue #1 (Fun with O2)

The AFR gage lights up, 14.7 AFR (On the gage, with the O2 sensor disconnected, UEGO set to default position), and the values on the EMS are displayed (via laptop ) and can be altered if I select a different mode with the UEGO, but don't reflect the readings from the gage itself. (Thought the correct sensor voltage of 2.34 volts is shown, with an EMS gain of 1, UEGO set to default position)

I think that part of the problem is that the O2 sensor tables in the calibration files don't match up with the AFR / Lambda values listed in the UEGO's manual. (Please see below) Keep in mind that this is a very ruff comparison between the UEGO manual and the AFR readings listed on the calibration sent to me. (Recalled all of this from memory)

EMS Table 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00> (Data from EMS O2 #1 tables)

UEGO AFR 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0> (As listed in the UEGO controler / gages manual)

02-VOLTS 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 5.00 (Voltage given to EMS from UEGO via the analog "white" wire.)

As you can see above, the numbers don't match up nor will the EMS allow me to enter a value beyond 9 or 10. So I am wondering how to complete the O2 calibration for this if there is such a huge difference between the EMS and UEGO without altering the tables somehow. (Changing the gain, and UEGO mode does not alter the table, just the current AFR value listed) Neither the manuals nor the online forums specify anything about this, and the EMS wizard is of no help what so ever.

How do can I correct this, or am I thinking too much into it? (I don't feel safe running the car until this is resolved, or at least explained)

Issue #2 (Case of the missing Cylinder)

I have noticed that the cylinders listed in the fuel maps are listed as follows:

Cylinder 1 Active
Cylinder 2 Active
Cylinder 3 None
Cylinder 4 Active
Cylinder 5 Active

I took a look at some of the other base maps, and they seam to follow a similar arrangement as this... Just curious as to why this is, as the S2000 is 4 cylinder? (Why was cylinder 3 skipped)

Issue #3 (Start-up and fuel)

I've read into what had been written about what to do if the car doesn't start-up, to increase the fuel in small increments until it turns over. (read it several times infact) The part I'm confused about, is do you increase it via the gas peddle or thru the EMS directly, and if it's thru the EMS how do I go about doing this correctly? (As the manual, and online forums don't say much of anything useful... The outside of the box is more descriptive)

 

I would try posting this in the forced induction forum:
https://www.s2ki.com/forums/index.php?showforum=142

I would also try the AEM website, they have excellent support forums.

 

Not sure why we use Cyl 1,2,4,5 but I expect it has to do with the fact that the AEM is a generic computer customised for each car. So you might find that cylinder 3 and 6 are used in 6 cylinder applications but for 4 cylinder apps the 1,2,4,5 drivers are more applicable

 

Not sure why we use Cyl 1,2,4,5 but I expect it has to do with the fact that the AEM is a generic computer customised for each car. So you might find that cylinder 3 and 6 are used in 6 cylinder applications but for 4 cylinder apps the 1,2,4,5 drivers are more applicable

 

It could also be due to cylinder timing.... As far as a know of, (Correct me if a am wrong) the firing pattern is 1, 4, 3, 2.

 

Issue #1: It seams that the wrong fuel type was selected... It was set to Methonal, which is at it's highest a 9 to 1 rato. Or cal can then be tuned in via CTRL-O, then scrolling down until you see the O2 #1 gain.

Issue #3: Aparently I can adjust the crank, and cold start fuel tables individualy, but i can feather the throttle the get a ruff idea on where to set these so the car can run smooth.

 

Latest update:

I have the idle running a bit more stable now (Approx 1100 RPM), and have taken the car for a very short and conservitive lap around the autoshop to build up a datalog for Torquefreaks to play with. (All in all, a 120 second run, all below 3K RPM's)

We are still working the issues with the EMS not feeding the correct inputs to the dash temp indicator. This is still a work in progress, as my tuner stateside is researching the correct pulse width settings. Until this is done, I'll just have to monitor the temp's via a laptop.

Other then that, I've noticed that the radiator fans have not kicked on, and we have idled the car until the engine temp sensor read 202F. (Which i believe is the switch-on point for the fans, 190 to 203 as per OEM manual) I'm just wondering if this has to be enabled via the EMS, and if so how can I do this?

S2000_Europe: Do you have a copy of your 2.5L basemap I could look at?

 

I'm wondering if you realise that this is a well known problem, with a fairly well known solution?

http://modifry.com/products/ect/index.htm

 

AusS2000, thank you for your input...

Not to belittle your input, but I resent the fact that AEM can't get their SH!T together with the S2000 EMS, and that we have to get yet another after-market part to fix something should should be working in the first place! For christ sakes, the dam EMS costs 1500-1700 clams depending on where you go, and it just amazes me that more folks don't complain about the utter lack of support of AEM's part with respect to it's "out of the box" operation. (If people dont bitch, nothing will get done)

I'd of though that "out of the box" and base cal loaded, that the EMS should be able to (at the very least) handle the basic functions of our S2000's. I'm starting to regret purchasing this system the more I look at it.

So far the EMS can't handle the following without modification:
-Dash temp display.
-AC and Radiator control
-Does not fit in the location of the stock ECU it replaces.
-Does not have an ext. connector to install a wideband O2 and controller directly to the 1052 ECU. (You have to splice in the O2 5v output, and install a 12v relay to power up the O2 wideband... dam thing draws like 4 - 6 amps of power!)

Had I known all this before hand I'd of not purchased this system!

 

I have a feeling you've OD on the full service industry the US is famous for. My response wasn't to justify AEM, but to help you.

Keep in mind the AEM EMS is a generic ECU originally designed by a company in the UK. It has been customised for various applications and when you consider it's strengths it's weaknesses pale in comparison. Price up a Motec if you want to feel better (and it won't drive the temp gauge either).

As for the rest of your issues, mine works fine with the AC, fits with some fudging and all widebands have to be spliced in as the AEM has been customised to use the OEM 02 sensor yet you want to use another one (as did I). And any high power device (such as a sensor that contains a heater) will require direct relay switch power.

You and I are standing at a window. I'm admiring a beautiful view. You're whinging that the window is dirty.