Am I missing something? I've seen stock s2k's dyno slightly over 200 rwhp

 

[QUOTE]Originally posted by yells2k
Am I missing something?

 

When you're tuning you should be looking at the delta.

 

Heres a couple aem questions I have.

I see there is an aem pkg out now with a wideband 02 sensor. What is it's value to me in regards as to it's integration into the AEM system in comparison to the pkg without it. And is it true a wideband 02 sensor only has about a 300 to 350 hour duty cycle before it needs to be replaced?

Secondly does the new aem version allow me to adjust my speedometer to accomodate my 444 gears? If I recall correctly there is a conflict problem between the aem and a yellow box compensator.

thanks

fltsfshr

 

Chris:

I'm running an stock S2000 engine with a somewhat shortened exhaust manifold and no cat in a Westfield (Lotus 7 derived) sportscar, using an AEM EMS with an AEM wideband O2 sensor. I started with the AEM maps for the S2000 and have been autologging with the wideband sensor. I think my fuel maps are getting fairly good, at least at moderate RPM & load, because, when I go closed loop, the fuel correction "pegs" only on very light throttle and low load. At low RPM, my maps are similar to AEM maps, but on the VTEC cam my maps are about 10 to 15% leaner. My short exhaust (which has a couple of 90 degree bends) may hurt breathing on the VTEC cam. I use 13:1 as an AFR target for WOT, gradually leaning to 14.5:1 at low load.

While the car runs well, I have problems with starting (either cold weather or hot engine), with idling (the problem comes and goes), and with Accel fuel (logs all show lean spikes when I floor the throttle). Could you share settings for those areas that would work with my stock engine? Especially Accel fuel.

And I'd welcome any other suggestions as well. Thanks in advance.

 

I just installed the EMS with wideband last night. There are a few things that I'm not impressed with so far.

1. The wideband instructions are very limited.

2. I would have thought the WBO2 would be a better PnP application with the EMS (if only I was a design engineer for AEM). There should have been no need to splice. Oh well.

3. The EMS comes with a N/A calibration only. Come on, how many FI S2000 people are out there running the EMS!? I guess AEM couldn't pick up one from them and provide it. The have FI maps for everything else with different injector sizes, type of FI, etc. but not for the S2000.

4. The forums are nice and all at the AEM site but there seems to be a major lack of response to the questions.

5. The cranking and loss of power to the EMS was kind of annoying and I can only hope that I never have that problem outside of my driveway.


That's about it so far.

With that in mind and going back to #3, does anyone have a base map/calibration for a Comptech SC with aftercooler pushing 7.6 PSI? I'm not looking for your all tuned out and running great stuff, just a base to get me started since the NA base stops at -0.03 on the load for the maps. I don't really want to put the ESM back on and fool the EMS.

Thanks.

 

Having the wideband 02 sensor makes it possible to generate your own fuel maps. (Note that I said "possible," not "easy.")

First set up Autologging and establish target AFRs. I thought that the target AFRs in the base map for O2 Feedback looked good so I used them. Then, starting with the AEM base map for fuel, get the system autologging while keeping your foot out of the throttle enough to avoid boost. After a bit, your fuel map will assume values for engine loads below 0 PSIg that match your engine's characteristics to your target AFRs. Then, based on your NA fuel map values, fill in the rest of the fuel map with initial settings up to loads which reflect the boost you expect to see. For example, if at 4000 rpm you automap to a pulse width of 7.5 at 0 PSIg, you might start your boosted map with a pulse width of 15 at 15 PSIg. Then input a smooth transition between those load points. This won't turn out to be an exact map, but it will give you a starting place for automapping under boost. And eventually you will have a fully automapped fuel map.

Automapping with boost will not be easy because the engine revs so quickly. Brake boosting (holding acceleration down by braking while accelerating) can help. Look for hills, and handle with care. Better to start rich (and foul plugs) than lean (and foul pistons).

For timing maps, see what AEM's base maps for boosted Hondas (non-S2000) do under boost and try that. And keep a sharp eye on the knock values. (Knock Raw is useless. Log values for Knock #2 Volts and Knock #2.)

AEM may be "plug and play," but it's FAR from "plug and race." (Credits to BlkMgk on the AEM list for that phrase.)

I should add that months of messing with my AEM ECU have given me a real appreciation of the complexities of fuelling an internal combustion engine and of the quality of performance of the stock ECU in virtually all production cars. Especially in areas like starting, idling, and managing a wide range of inputs -- temperature, moisture, altitude, throttle motion, and so on.

 

I never expected it to be PnR. I did expect a little better job on the AEM base stuff though. I mean they have Vortech and turbo stuff for all the other Honda models except the S2000. They've been working on it for what, 2-3 years now?

Part of this is of course my limited knowledge of things, but I'm a quick learner.

I've got no problem with the autologging stuff but it is a bit slow. My main problem is adjusting the load breaks above -0.03PSIg without loosing the idle.

Nobody ever said it was gonna be easy.

 

Hey guys, I had a question on how did you mount your ems? I can't fit it in the stock location unless i remove the serial port cable, I the ems suppose to be mount without the cable plugged in the ems? If so, wouldn't that mean that you have to remove the ems from it location everytime a tuning adjust is made or to data log?

 

Mine mounted in there with the cable attached.