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Old 07-07-2006, 09:02 PM   #1
scooby24
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Default Anyone answer this question about ST?

I sent this to Cobb....if anyone else knows the answer please feel free to chime in....if not I'll post what Cobb's response it.

Quote:
Hey, I bought the Street Tuner software for my 2006 MT WRX and I’m having a hell of a time getting some basic concepts down. Is there any way we can take the OTS VF39 supplied map and convert it to ST format so we can at least run that until I can get around to tuning the car? I want to load ST and start tinkering before I hop on the dyno but really don’t want to immediately have to create a VF39 map with nothing to go off of. A base and realtime map as a starting point would be fantastic.

If this is not possible, how do you propose I use your software? I just have to load it and then completely fabricate my own Base and Realtime maps for the VF39? If so that really sucks.

-Greg
(Scooby24 on NASIOC)
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Old 07-07-2006, 09:15 PM   #2
jebjkey
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Wow, it seems that you are a little off on the whole point of ST. You are supposed to make your own maps for your individual setup. Cobb does provide base maps for all other years, I guess the 06 maps are a little behind. I am sure they can hook you up with a base map to start from though. You make your own realtime maps by saving a base map as a realtime map, Cobb does not need to send you one. You will want to fabricate your own maps anyway, even if Cobb sends you a starter map.

Here are my thoughts on how to make your map:
The first thing to do is adjust you injector scaling:
With the car fully warmed up and idling, look at immediate and learned fuel trim. If the sum of the two is more than +/- 5%, adjust your injector scaling to make the sum +/- 5%. I would reset along the way the put learned trim back to zero, if necessary. The value will bounce around, but close to zero is what you want.

I would set fuel next using a wideband:
I remapped my intake to get more accurate MAF readings, you can if you want but make sure your injector scaling is good first. I chose my WOT AFR I wanted and ramped to that value making all the fuel map changes along the way. Looking at data logs for where spool occurred and what AFR was compared to what was in the table. My AFR's are very close to desired with the remapped intake. Look/listen for knocking as you adjust fuel just incase you need to pull some timing along the way.

Now, set boost levels / turbo dynamics:
Put in the desired boost level you want, taper down 1.5-2 lbs from 5200 to redline. The dynamic maps can be left alone for now. Set WDC values low and do some data log pulls. Fourth gear is best but it is hard to find the right area and it is not necessary to get to redline in fourth. Use third gear for the higher RPM WDC adjustments. Slowly bring up WDC using the data logs as a guide until you are happy with the boost level at different RPM's. When boost levels are close, you can mess with the burst and continuous maps. The idea with the burst map is to make the values as high as possible (AFTER WDC IS ALREADY SET) and not spike. If you are spiking, lower the values. The continuous table should be the same, as high as possible without boost wavering once you get there. Same as above for knock.

Now that fuel and boost are set, work on timing:
The ECU will optimize timing around the values you give it. If you are too high, the ECU will just pull it and end up with negative values in the Knock correction map, it can also add timing if you are too low, but this is minimal and takes a long time for the ECU to do this. All of that takes some time for the ECU to learn though. The idea is to get close to the optimal timing on your own, but on the low side for safety. I would set my freeway cruising values first too see how much you have to adjust from Cobb's map. (If you want to adjust you intake for accurate MAF readings on the freeway; set the cruise control to your freeway speed, using immediate and learned fuel trim, adjust you intake values to make the sum +/- 5%. You can use how much you adjusted those values to base any adjustments to the rest of your intake curve if you want.) Adjust the timing as able without getting knock traveling down the road. If you knock, lower timing by 2 degrees and call that good. If you set the dynamic timing table to all the same value, it makes it easier to determine the total timing when you put a value in the primary timing map. Do some pulls in third to redline and look at the data logs to determine if you have too much timing or not. Over some time raise you timing in increments and let the car run that way for a couple days, making plenty of runs to redline in whatever gear as conditions allow. Check your knock correction map to see what it reads, all zeros means you can probably up timing a little more and go for couple-few more days and look at it again. Any negative values and you should look into lowering timing for the applicable area of the table. You do not need to reset after each timing adjustment, the knock correction map will learn itself out of the negative values if the new timing values are good.

This is just my thoughts on how you can go about making your own map for the vf39.
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Old 07-07-2006, 09:35 PM   #3
scooby24
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^ Thanks for the informative post! I'm new to cobb....came from loooots of Utec tuning.

I don't have the whole concept of the difference between base and realtime maps. Cobb does supply a basemap for stage 1 and stage 2 but was hoping to basically take the OTS VF39 maps they supply and use that as my base map for tuning...that way I can tune off of that starting point. Dyno time is expensive and the less time I have to spend tuning from scratch the better.
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Old 07-08-2006, 10:00 AM   #4
Oldfart Racer
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You could download the VF 34, it will be a good start. Also the ST maps on Cobb site are all 91 octane, so if you have 93 it will be very safe.
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Old 07-08-2006, 04:55 PM   #5
06rexwagon
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They can convert their .ptb maps to .stb and send them to you. Christian sent me a bunch of maps for my 06 that weren't available on the webpage. Ask nicely, and I bet he'll send you their OTS map for street tuner for your VF39.
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Old 07-08-2006, 06:36 PM   #6
scooby24
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^ PERFECT. Exactly what I wanted to hear.
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Old 07-25-2006, 02:31 PM   #7
Yoo Shin
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Default

Quote:
Originally Posted by scooby24
^ PERFECT. Exactly what I wanted to hear.
have you done this yet?

I was orginally going to go w/a VF39 for my 06 but didn't like how you loose a lot of the low end grunt from Stage II to the VF39 ots map. I was thinking one could use the Street Tuner to run a map for the VF39 w/ more low end in mind.


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Old 07-25-2006, 02:53 PM   #8
scooby24
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2004 Forester XT 5MT
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Default

Quote:
Originally Posted by Yoo Shin
have you done this yet?

I was orginally going to go w/a VF39 for my 06 but didn't like how you loose a lot of the low end grunt from Stage II to the VF39 ots map. I was thinking one could use the Street Tuner to run a map for the VF39 w/ more low end in mind.


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Nope haven't done it yet but thanks for reminding me. I'll ask if this is something we can get.
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