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Old 11-21-2006, 10:38 PM   #1
Sausage
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Default How to tune with Street Tuner : I need major Noob Help

I want to start playing with Street tuner. I already have a good base map to use, but every manual I read just states to start with a base map and tune from there.

What does "tune from there" mean?

What is the general tuning procedure? What parameters do I start with.

I've searched and can't find anything
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Old 11-21-2006, 10:40 PM   #2
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PS, I did read AccessECU Software Calibration & Tuning Guides for Subaru
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Old 11-21-2006, 10:50 PM   #3
hondaeater69
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ok it doesn't sound like you know enough to start messing with maps just yet...

I would pick up and read Jeff Hartmans "how to tune and modify EMS's" first.
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Old 11-21-2006, 10:55 PM   #4
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^ nice, that's what I was looking for.

Thanks
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Old 11-22-2006, 11:16 AM   #5
nomex ninja
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Great book, I have it. Another good one is Forced Induction Perfomance Tuning by A. Graham Bell.
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Old 11-22-2006, 11:38 AM   #6
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Log the car with the base map first.

What are your mods?
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Old 11-22-2006, 01:36 PM   #7
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stage 4 wrx with all the bolt ons you can find - alky

I picked up the book today, but I was wondering if there are any online guides that are more specific to the wrx ecu with cobb as my em
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Old 11-22-2006, 01:48 PM   #8
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there are some tips in the street tuner software itself, if you go the help section, but that won't teach you how to tune.

the key is taking small steps. log, make small changes, notice differences, log again repeat. i suggest working on one map at a time, some suggest dialling in boost first, then working the other maps.

there are maps for target boost, boost limits (before you hit fuel cut), and dynamics (spool). if you go into the help section it will tell you what each map does.

then there are timing and fueling maps. of which you can start to add timing, and take away fuel.

if you do some searches in the EM forum you can find some good reads on how people tune these. i'm not tuner myself i only konw the basic fundamentals so i'm not going to be a huge help here

oh i would also check out www.cobbtuning.com they prolly have some tuning info there too.
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Old 11-22-2006, 01:53 PM   #9
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Thanks

I checked out the cobb forums and did some reading, but there is tons of stuff I'm not sure about.

For example, what order do you tune the maps in.
What effects to look for (beside the feel of the car)
ect...
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Old 11-22-2006, 02:07 PM   #10
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1. Boost
2. Fuel
3. Timing


Decide how much boost you want to run then create a table that has a reasonable boost curve.

Decide what afrs you want to try to run. Decide on a target afr.

The timing you really don't just decide, you have to find the correct timing that match the above value combinations.

Quote:
Originally Posted by Sausage View Post
Thanks

I checked out the cobb forums and did some reading, but there is tons of stuff I'm not sure about.

For example, what order do you tune the maps in.
What effects to look for (beside the feel of the car)
ect...
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Old 11-22-2006, 04:25 PM   #11
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Quote:
Originally Posted by Zumble View Post
1. Boost
2. Fuel
3. Timing


Decide how much boost you want to run then create a table that has a reasonable boost curve.

Decide what afrs you want to try to run. Decide on a target afr.

The timing you really don't just decide, you have to find the correct timing that match the above value combinations.
Here come the noob ?s

What's a "reasonable" boost curve look like?

Aren't afrs supposed to be 11:1

How do I know when I've found the correct timing? Or how do I go about looking for it?
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Old 11-22-2006, 04:50 PM   #12
Jasonzemos
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Quote:
Originally Posted by Sausage View Post
Here come the noob ?s

What's a "reasonable" boost curve look like?

Aren't afrs supposed to be 11:1

How do I know when I've found the correct timing? Or how do I go about looking for it?
I've read the entire streettuner user guide end to end and these are still great questions i'd like to hear back on from the pros. I definitely recommend you read the guide though: http://www.accessecu.com/support/st-wrx-usersguide.pdf.
Edit: better: http://www.cobbforums.com/forums/att...6&d=1158860512

With regard to timing, I've read that the ecu contains a base timing map and a dynamic advance timing limit map, and the ecu learns what works and doesn't work based on knock sensing, thus choosing a value in between which is signified by the ignition advance multiplier. If this is all true, I've always wondered if a method to find the right ignition timing (after establishing your boost, fuel, etc) would be to set the base map really low and then the dynamic advance limit sky high and see how far the IAM wants to go...?

Last edited by Jasonzemos; 11-23-2006 at 01:05 AM.
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Old 11-23-2006, 09:26 PM   #13
rexnprogress
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get some dyno time.

hook up a wideband (you shouldnt be doing any tuning without one.). i just did a pull to find out at what cell the turbo spooled, which was a starting point for my workable area. you'll really only be working with every cell below, and to the right(in a square). raise or lower the whole group at once to get it ballparked for afr's, then go from there. same thing for timing. do a pull to find out what cell it spools in, then work inside a box all the way to the right, and all the way down from that point. raise it a degree at a time until there's no gain in power, then back off one.

at least thats what we did for my initial tune. ended up with ~11:1 afr's, +70hp/+60tq over the baseline.
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Old 11-23-2006, 11:38 PM   #14
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You basically want to get full boost asap then hold the full boost for as long as it makes sense to before the turbo blows hot air or your turbo can't hold boost anymore. That part really depends on the turbo you have. VF39s typically want to ramp up to 18psi or so 3000-3200 or so then you can either hold that or go with more boost then taper down to 15psi or so near redline..

AFR, the afr you dial in on the map may not be what comes out of the tailpipe. You need a wideband to verify it.

Timing, your ECU will actually tell you how much timing it wants. Once you have the AFR and boost curve set.. you can use the dynamic advance values (knock correction) that the ecu gives to adjust the timing. Once you get the KC numbers during the pull to be the max number in the KC/DA table then your base timing value is good. Then you can keep it there or take away 2 degrees to be safe.



Quote:
Originally Posted by Sausage View Post
Here come the noob ?s

What's a "reasonable" boost curve look like?

Aren't afrs supposed to be 11:1

How do I know when I've found the correct timing? Or how do I go about looking for it?
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Old 11-25-2006, 02:16 PM   #15
hondaeater69
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just read the accessecu software calibration and tuning guide published by cobb, and IMO if you read and understand that, it should give you more than enough to get started.

they go into a lot of depth of what maps you should start with, how the systems work, how to start tuning the maps, and what to be looking for.

i think you should read the guide again
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