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Old 07-07-2012, 08:00 PM   #1
silver007
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Hello. I've just gone stg 2 in my 2007 wrx and I'm going to custom tune the car myself. I'm just going to take it slow and learn as this is the first car I've tuned. I've read through the tuning guide much of what's on here (that I can understand ) and I have a couple questions.

Is it necessary to modify the tip-in values with stock injectors? Is it necessary to change MAF calibration with the stock injectors? Is there no way to determine MBT without using a dyno? If not how is that going to affect the end result of my tune?
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Old 07-07-2012, 10:50 PM   #2
silver007
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Anybody?...I may need to put this in the main tuning forum.
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Old 07-08-2012, 11:12 AM   #3
Cobb Tuning
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Generally, you shouldn't have to touch tip-in enrichment with the stock injectors unless you are trying to achieve some specific goal. MAF calibration is specific to the intake used, not the injectors, so, you would not have to touch MAF calibration with the stock intake (again, unless you were trying to achieve some other specific goal - some guys feel that the stock MAF calibration is not spot-on and try to refine it further).

Tuners doing road tunes (i.e. tunes without a dyno) typically rely on knock response as a means to try to estimate MBT (back off the timing when they see knock). You can also use one of the various road dyno functions, but they are not typically consistent enough to be able to accurately discern small differences in power between runs.

Bill
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Old 07-08-2012, 04:43 PM   #4
silver007
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Excellent. So reading through cobb's tuning guide it seems that my first step is to datalog the relevant variables to tune boost targets. I'll prob need to decrease my wgdc values since my 'catted' exhauat doesn't have a cat. The pill will soon follow and I would expect to bring the values back up.
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Old 07-08-2012, 09:00 PM   #5
Cobb Tuning
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Boost tuning can take a good chunk of time to dial in - I would get the hardware set to what you want and then start on it. In the meantime, you can set the entire wastegate duty high table to zero to disable boost control (if you currently have an issue with overboosting).

Bill
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Old 06-14-2014, 11:56 AM   #6
Ravel36
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Id like to jump on this because this is an area that I have questions about. I am in the same situation where I am self tuning. While reading through the guide I got to the Primary ignition calibration and dynamic advance cal to find MBT. But I am running an aftermarket cobb intake and DW 1000 injectors. My question is how do I modify the tip in calibrations? The guid was not clear. Can I use the knock sensor to dial in MBT, by removing timing from the primary ignition?
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