I was getting my car tuned but my pulley started slipping when we actually started running the car all the way to redline. This is the map now, still on "safe mode". Was wondering if you guys could give me some feedback on how it is tuned so far.

750cc's
3" pulley

If I take the car up to about 7k it starts sputtering and won't go any higher. I also blow out a lot of smoke from running way rich.

Was wondering how accurate the O2 sensor on the EMS is in reading the AF ratio, and if I could go by that for tunning purposes.

Thanks in advance

Map

 

If you are running the AEM UEGO that has the gauge it is pretty accurate (not saying the other AEM units aren't, I just have no experiance with them). Looking at your map I se that you don't have closed loop O2 running...any reason why? My car blows out tons of smoke under WOT, and aslong as you are not running like 10 AF you should be cool.

 

I went out to do some data logging and saw that the boost was hitting 6.7psi at about 6.5k. It came out to a .stf file. Don't know what I could use to open it.

In second gear it hit 9.4lbs at 7886

 

I recently found the AEM uego gauge to be not so accurate when compared to the Lambda meter on the DynoDynamics dyno that I use to tune. It was closer at higher rpms/higher loads than at lower, but at off-idle and low loads it was way off.

You map looks to be in order, as far as the injector offsets and sensors are concerned. Do you have the AEM O2 sensor hooked up to the EMS?

I would try pulling some timing out up top.

Otherwise the fuel map looks pig rich up top. Running richer than 11.5-12.0:1 is just a wast of fuel, IMO of course.

I bet you would be a member of the Black Bumper Club. Do you find your rear bumper covered in oily soot after running the car hard for a few days?

You said that you hit 9.4lbs at 7886, if so you need to rescale your maps to be able to tune to those levels of boost. At that pressure you are well off the map, there is no control over what the ems will do at that point... usually we assume that it will just hold at the top of the map when you overshoot, but that is not always the case. I bet this is the cause of your sputtering up top...


The stock honda MAP sensor will be good for about 10.5 psi, anything over that and you'll need to go to a 3 bar.


You need to use the AEM Log program to open the .stf files.

Cheers

 

I'm looking at the stats from the log now. If this O2 sensor actually is what it sais then at 7,800 the AF is at 12.35. I would be pretty happy with that.

Do you by any chance know how much the fuel has to go up if I raise the boost to like 9.75? I'm guessing the same slope should keep going.



It might of been a lot of money to buy the EMS, but seeing how much it could do, in the last few days I realized that its completly worth it. Definetly a recommend to anyone else on the deciding border.

 

What is a closed band O2?

 

O2 feedback or closed loop operation uses the 02 sensor input to hit a target AF ratio. You can enable this feature with the EMS

You need to verify your 02 sensor is accurate before doing so.

 

Exactly what he said

 

looking at your O2 sensor calibration table, something seems to be off, at the rich end your ecu is interpreting a wide voltage range as a single a/f ratio

 

I am also looking into buying the EMS , i have some experience tuning with it because we use it on the formula sae car at school (same model 1052), the thing is just amazing.