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Go Back   IWSTI.com: Subaru WRX STI Forums > IWSTI Engine & Drivetrain > ECU Tuning & Performance Electronics > Cobb Street Tuner


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Old 06-16-2006, 10:16 AM   #1
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Default My TDC changes

I've been lucky enough to have worked with this table for awhile through the help of an internet colleague (BIG thanks to you know who!!). I've made some definite mistakes with this table. However, through trial and error I finally got to something that I liked. In this post I will show you the stock values/graph and my modified values graph. Here we go ...

Stock Values ...


My Modified Values ...




Now let's compare what these values actually do. First the stock graph. Notice how low accelerator angle (tiny accelerator movement) results in rather large throttle angle movement. For example, 13% acclerator results in 21% throttle.




Now the modified graph. Definitely a little more linear in the beginning and also more linear toward WOT ...




Simply put, the values do several things ...
1) Low accelerator angles don't result in huge throttle angle. For me, I like this. Some people won't. However, for me, the STI accelerator was always too touchy. Now, for me, it's much improved.
2) More linear down low and more linear as you approach WOT.
3) Throttle closing at WOT is now gone. You will hit the rev limiter before the throttle closes.
4) Accelerator angles are constant throughout the RPMs.

I also want to note that you guys can use this table to create WOT shifting. Simply shut throttle down to 5-20% right before the RPM where you want to shift. Taylor the percentage based on your quickness and how much air you want to keep flowing through the engine. Make sure to also change your REV limits to be slightly above that shift point to ensure you don't over-rev.

Last, but definitely not least, this ECU table absolutely does NOT contain Accelerator Angle vs. Throttle Angle. The values in the table are DUTY CYCLE values for how the throttle is pulsed. Don't assume that what is in that table corresponds to actual throttle angles. It totally does not. Been there, done that. Very small throttle duty cycle changes can make a huge impact in the table. Also, I tried to change the column headings to create linear, normal column headings (like 10, 20, 30, 40, etc). This resulted in a horrible curve. If you played around with that A LOT and committed yourself to a LOT of base flashes then you could probably work it out. However, I decided to stick with the stock column headers and tweak the values until I got what I was looking for.

WOO!

t


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Old 06-16-2006, 12:13 PM   #2
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Cool beans. I might just have to try your changes. Thanks for sharing.
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Old 06-16-2006, 12:52 PM   #3
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Default

I just tried this, and it works great.


It's too bad that this is a realtime map. I can't imagine how many reflashes this must have taken you, since this is very tactile and kinesthetic by nature.
Great job
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Old 06-16-2006, 01:43 PM   #4
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Quote:
Originally Posted by reid-o
I just tried this, and it works great.


It's too bad that this is a realtime map. I can't imagine how many reflashes this must have taken you, since this is very tactile and kinesthetic by nature.
Great job
Cool. Glad you like it! It took me quite a few tries doing different things. Luckily, most of these changes I did while making other base map changes

t
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Old 06-16-2006, 08:05 PM   #5
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This is sort of a general street tuner question, but it comes about from your TDC edits.

After I downloaded the street tuner update, I made the TDC changes on my desktop, since they're a basemap change, and sent them to the accessport. I then applied my current realtime map from the accesport.

However, when I connected with my laptop via livetuning, it shows none of the basemap changes. Is that a function of livetuning--that it does not update the basemap information? Or should I have not applied my old realtime map over it.
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Old 06-16-2006, 08:19 PM   #6
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Did you flash the base map to the ECU? I can't quite tell from what you wrote. Base map changes will only stick if you flash it (with the green connectors connected).
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Old 06-16-2006, 08:24 PM   #7
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Quote:
Originally Posted by daemon
Did you flash the base map to the ECU? I can't quite tell from what you wrote. Base map changes will only stick if you flash it (with the green connectors connected).


I sent the basemap from my desktop to the Accessport and then flashed my car's ecu with the accessport (green connectors connected).


I then applied my realtime map, the one I've been using for awhile from the accessport.
When I connected my laptop (i installed it to both my desktop and laptop) to datalog, Streettuner none of the TDC changes were shown for some reason.


But then when I pull the basemap from the accessport to check, all the changes are there.

dont get it

Last edited by reid-o; 06-16-2006 at 08:30 PM.
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Old 06-16-2006, 08:29 PM   #8
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Reid-O,

I understand what you are saying. This is a function of RealTime vs. Base maps. When you connect to the ECU via your laptop, only RealTime maps will be pulled from the ECU to your laptop - not the base maps. So, what you are seeing is completely normal. The base map information you are seeing in StreetTUNER is the current base map you have loaded in StreetTUNER. What do I do? I always make sure that whenever I flash a base map to my ECU, that I then make sure to load that base map in StreetTUNER and then shut down StreetTUNER. Now, everytime you open StreetTUNER it will always default to the last base map loaded ... and that just so happens to be the latest base map you put on your car's ECU.

t
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Old 06-16-2006, 08:31 PM   #9
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When you save the map you can save it as a basemap (all parameters) or a realtime map (only the realtime parameters).

map switching from the accessport is only writing the realtime parameters to the ECU.

In order to get changes made to a basemap table to the ECU you will need to
1. save a basemap file type.
2. use the map manager to put the basemap on the accessport.
3. use 'Change basemap' option in the accessport to do a flash (requires the green test mode connectors and about 10-20 minutes of downloading)
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Old 06-16-2006, 08:34 PM   #10
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Man this sucks. I guess we all have nothing better to do on a Friday night?

edit: although I guess R4ND0M_AX3 is in California, so there is still hope for him. And, well reid-o is in Hawaii. I hate you!
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Old 06-16-2006, 08:34 PM   #11
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Quote:
Originally Posted by WolfPlayer
Reid-O,

I understand what you are saying. This is a function of RealTime vs. Base maps. When you connect to the ECU via your laptop, only RealTime maps will be pulled from the ECU to your laptop - not the base maps. So, what you are seeing is completely normal. The base map information you are seeing in StreetTUNER is the current base map you have loaded in StreetTUNER. What do I do? I always make sure that whenever I flash a base map to my ECU, that I then make sure to load that base map in StreetTUNER and then shut down StreetTUNER. Now, everytime you open StreetTUNER it will always default to the last base map loaded ... and that just so happens to be the latest base map you put on your car's ECU.

t
I didn't want to say out loud that I loaded two versions of street tuner.

But thanks. That totally answered my question
Thanks...
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Old 06-16-2006, 08:43 PM   #12
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Quote:
Originally Posted by R4ND0M_AX3
When you save the map you can save it as a basemap (all parameters) or a realtime map (only the realtime parameters).

map switching from the accessport is only writing the realtime parameters to the ECU.

In order to get changes made to a basemap table to the ECU you will need to
1. save a basemap file type.
2. use the map manager to put the basemap on the accessport.
3. use 'Change basemap' option in the accessport to do a flash (requires the green test mode connectors and about 10-20 minutes of downloading)

Thanks..i understand that part.

I just didn't understand why Streettuner was not showing the basemap changes that I flashed when using a different computer. But thanks for the help...
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Old 06-20-2006, 06:26 PM   #13
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Darn it. Was going to test this out, but I ain'ts got no room left in my base map. Maybe I can juggle out a few other changes to try and find the room. Don't think I'll be able to do it though.
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Old 06-21-2006, 04:18 AM   #14
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Quote:
Originally Posted by daemon
Darn it. Was going to test this out, but I ain'ts got no room left in my base map. Maybe I can juggle out a few other changes to try and find the room. Don't think I'll be able to do it though.
What changes do you actually have in your base map? I think I have only the very very important stuff like injector configuration, MAF table, etc. My base map contains only the necessary information to drive the car safely if I lost the realtime map.

t
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Old 06-21-2006, 06:01 AM   #15
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to free up room in my base map for the tdc changes i took all my timing maps back to stock values, this opened up enough room for the tdc changes. i also have all my boost and wastegate maps set to 0, making my base map a wastegate boost only map (14.5 psi on my turbo) The tdc changes improve drivability. feels much smoother than the stock map. you do have to blip the throttle more when starting from a stop, or rev matching between shifts, but after 1 day i am already used to it.

thanks for the map wolfplayer!


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