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Old 03-21-2013, 05:01 PM   #12
pkluong
Scooby Specialist
 
Member#: 341113
Join Date: Dec 2012
Chapter/Region: SCIC
Location: Huntington Beach, CA
Vehicle:
2013 WRX
Dark Grey Metallic

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Quote:
Originally Posted by Cobb Tuning View Post
Besides certain strategies that may be designed to reduce emissions (but may not actually do so by any notable amount) but definitely hamper performance/driveability, Subaru also has to deal with only a single tune to work with the worst possible gas quality in the country and the fact that some of the customers will not put in the required high octane gas (use 87 octane instead for example). They are dealing with the lowest common denominator, basically. The combination of all these factors results in less than ideal factory mapping.

With our off-the-shelf mapping, we retain all the safety features of the factory ECU (knock detection/correction, boost limits, rev limiters, etc) but we modify the calibration to not only give better performance/driveability, but also to mitigate some of the more potentially damaging strategies in the stock tune, such as the factory's extended closed loop to open loop delay in most Subarus (causing you to run what would be considered lean well into boost).

We also create different octane maps for different fuels across the country (91ACN, 91, or 93). So, we've created a 93 map with more performance than if we were forced to create only a single map that had to work with the worst 91 octane available in the country. The 91ACN is a special map to work with the poorer quality 91 available in Arizona, California and Nevada.

For most models, we also offer the low, normal and high wastegate versions of the maps, which allows you to switch between these maps if you happen to be overboosting (use lwg) or underboosting (use hwg). Variances between cars and conditions they are used in can cause different levels of boost to be seen at times, so this gives you the option to switch if that happens. Again, something Subaru can't do with a single map.

The ultimate performance/driveability can come from a custom tune, which can also be accomplished via a professional tuner (or yourself if you are also experienced with tuning).

Bill
Interesting... This ties into my thread as well (not trying to hijack thread. maybe combine them?)

http://forums.nasioc.com/forums/show....php?t=2481386

Bill, You state that Cobb tunes increase drivability and performance, but what are its effects on reliability? does it increase because of bad stock tune? decrease due to increased performance? or the same because of a smoother tune but with increase performance?
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