AEM EMS Knock Table and 9 PSI Vortech
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Joined: Feb 2002
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From: PDX
Hi Gary, no worries. Owning my car has been a constant exercise in learning new things which I never expected to need (much less to want) to know. I can review my EMS maps and datalogs, and I've long gotten comfortable changing many of the parameters.
What I was saying was that if you've not tuned a lot of cars with the EMS and actually DONE an S2000, you may find yourself spinning your wheels struggling with an issue that someone like Sean can resolve in five minutes.
Were I you, I'd at least send him your maps and pay him to review them. You might find that getting you 95% of the way to a satisfactory tune, leaving you to fine-tune the rest. That approach worked well for us.
In any case, good luck!
CB
What I was saying was that if you've not tuned a lot of cars with the EMS and actually DONE an S2000, you may find yourself spinning your wheels struggling with an issue that someone like Sean can resolve in five minutes.
Were I you, I'd at least send him your maps and pay him to review them. You might find that getting you 95% of the way to a satisfactory tune, leaving you to fine-tune the rest. That approach worked well for us.
In any case, good luck!
CB
Joined: Apr 2002
Posts: 4,857
Likes: 0
From: Gold Coast
Originally posted by GaryRudolph
Hehe, well, I'm just learning, and there may be more qualified persons. I've been trying to share the experience with others. I'll keep posting the info.
Once I get a more stable I plan on making my calibration available too. But I still don't have the accel tables working to my satisfaction.
Hehe, well, I'm just learning, and there may be more qualified persons. I've been trying to share the experience with others. I'll keep posting the info.
Once I get a more stable I plan on making my calibration available too. But I still don't have the accel tables working to my satisfaction.
i've made a library here
http://forums.s2ki.com/forums/showthread.p...threadid=183359
lets hope that we can all benefit and learn from this
THANKS for sharing the info gary
Thread Starter
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Joined: Oct 2002
Posts: 390
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From: Moorpark, CA
The goal was to datalog the knock sensor car for a significant period of time on the road in a condition in which I could guarantee no knock. To do this I did the following:
Make sure the car is tuned and knock doesn't occur. In essence you need a tuned AEM map. It's important to have the AEM tuned before beginning any of this.
Next, I ran my car almost empty of fuel. I then filled the car with 100 octane fuel. I drove about 100 miles to ensure that the car was only running on the 100 octane fuel. Then, I took my current map and decreased the entire timing map by 3 degrees (Note, I ran a little rich after detuning the car).
At this point I felt very confident that if I drove the car knock would not occur. The next step is to configure logging of the knock sensor. First, you want to utilize internal datalogging with the AEM with the maximum sampling rate. The reason is that the external datalogging does not have sufficient resolution to capture knock. To be honest, the internal datalogging doesn't capture knock every time.
I configured internal datalogging at a resolution of 250 samples/second. I made sure that RPM and Knock #2 Raw Voltage were logged at the high sampling rate. Those are the two values we want to plot.
Next, it's a matter of driving the car under various conditions and logging the values. I believe the high sampling rate only gave 3 minutes of logging, so you have to be quick. I logged the car under the following conditions:
1) Driving around town on surface streets. With stop lights, etc.
2) Driving on the highway. With on-ramps, etc.
3) Dead stop pulls from 1st to 4th gear with shifts.
I'd perform one of these conditions for 3 minutes, stop the car, download the data from the ECU. Then repeat. I did 6 actual datalogs. The goal is to baseline the noise of the engine over as many conditions as possible.
Then, using AEM Log I'd open the datalogs and export them to a text file. I did this for each log. I then imported this data into Excel and created scatter plots with all the data. Note, excel only alllows a maximum of approximately 65,000 rows, so I had to break up the data into multiple datasets.
Once, I plotted the data I could impose my own filter line and view it.
Note, you can do a scatter plot directly in AEM Log, but you can't superimpose the knock filter.
If you like you can download my excel spreadhseet to see what I did:
KnockCalibration.zip
Make sure the car is tuned and knock doesn't occur. In essence you need a tuned AEM map. It's important to have the AEM tuned before beginning any of this.
Next, I ran my car almost empty of fuel. I then filled the car with 100 octane fuel. I drove about 100 miles to ensure that the car was only running on the 100 octane fuel. Then, I took my current map and decreased the entire timing map by 3 degrees (Note, I ran a little rich after detuning the car).
At this point I felt very confident that if I drove the car knock would not occur. The next step is to configure logging of the knock sensor. First, you want to utilize internal datalogging with the AEM with the maximum sampling rate. The reason is that the external datalogging does not have sufficient resolution to capture knock. To be honest, the internal datalogging doesn't capture knock every time.
I configured internal datalogging at a resolution of 250 samples/second. I made sure that RPM and Knock #2 Raw Voltage were logged at the high sampling rate. Those are the two values we want to plot.
Next, it's a matter of driving the car under various conditions and logging the values. I believe the high sampling rate only gave 3 minutes of logging, so you have to be quick. I logged the car under the following conditions:
1) Driving around town on surface streets. With stop lights, etc.
2) Driving on the highway. With on-ramps, etc.
3) Dead stop pulls from 1st to 4th gear with shifts.
I'd perform one of these conditions for 3 minutes, stop the car, download the data from the ECU. Then repeat. I did 6 actual datalogs. The goal is to baseline the noise of the engine over as many conditions as possible.
Then, using AEM Log I'd open the datalogs and export them to a text file. I did this for each log. I then imported this data into Excel and created scatter plots with all the data. Note, excel only alllows a maximum of approximately 65,000 rows, so I had to break up the data into multiple datasets.
Once, I plotted the data I could impose my own filter line and view it.
Note, you can do a scatter plot directly in AEM Log, but you can't superimpose the knock filter.
If you like you can download my excel spreadhseet to see what I did:
KnockCalibration.zip
Registered User
Joined: Dec 2003
Posts: 4,369
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From: Murrieta, CA
- my friend was gonna fly Sean out here to tune his EMS for his integ...
- but seems like sean doesn't tune anymore:
"I have some good news and some bad news. The bad news is that I am no longer tuning. I am concentrating on the business aspect of TorqueFreaks and don't have any time to do much traveling. The good news is that we have a tuner who is even better than me. He just got done tuning two cars in Europe, a car in Connecticut, and a car here at the shop. He's flying to Tennessee in a couple weeks to tune a Viper as well. He has tuned more Hondas than I have and he's an ASE master tech who is excellent at mechanical and electrical troubleshooting. He will be the one tuning your car. If you'd like to speak with him first to make sure you're comfortable with him, just let me know and I'll get the two of you talking."
- but seems like sean doesn't tune anymore:
"I have some good news and some bad news. The bad news is that I am no longer tuning. I am concentrating on the business aspect of TorqueFreaks and don't have any time to do much traveling. The good news is that we have a tuner who is even better than me. He just got done tuning two cars in Europe, a car in Connecticut, and a car here at the shop. He's flying to Tennessee in a couple weeks to tune a Viper as well. He has tuned more Hondas than I have and he's an ASE master tech who is excellent at mechanical and electrical troubleshooting. He will be the one tuning your car. If you'd like to speak with him first to make sure you're comfortable with him, just let me know and I'll get the two of you talking."
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