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OPENSOURCE TUNING: Your questions answered here!!! RomRaider + Tactrix

290K views 63 replies 29 participants last post by  Wiscoguy920  
#1 · (Edited by Moderator)
There seems to be increasing misinformation/questions about how Opensource tuning software works. This is just an overview to give a general understanding of what the software actually does or can do as opposed to a "how do I tune?"guide or how to use the software. Included are links to info about getting started using Opensource software and other information for those curious to learn more about self tuning. The links below are Subaru based tuning in general and not just limited too only Opensource tuning software.

For the most part Opensource software is no different than Cobb's Accessport or Ecutek. Your laptop, along with the purchase of a Tactrix cable, is basically used as the Accessport. The AP is better suited for those that want a very straight forward "plug and play" solution. The Opensource stuff does take a little more computer know how and a little more patience but is a great solution. Just because you choose to go the Opensource route it does not mean you have to tune your own car from scratch. This seems to be on of the bigger "misconception/myths" out there as far as Opensource software is concerned.

There are free premade base maps available on Romraiders site (in the "base map" subforum) or XPT's forums (you need to register first to have access) but they are use at your own risk. You can also have a tuner dynotune or roadtune your car using Opensource,which then they will install the final map for you. Or you can purchase premade custom maps from professional tuners to use as well that usually include remote support. This is know as "E-tuning/remote tuning". You can load the map,take some datalogs and then send them back to the tuner. The tuner can then analyze the logs to see if there are any potential problems. If so then the tuner can retweak the map and send the newly modified map back to you.These maps are generally much more reliable than Cobb's OTS maps as they are more custom suited for your car. It is imperative to make sure you vehicles battery is in tip-top shape as well as your laptop before trying to flash your vehicle. I generally have my laptop plugged in to a 120v outlet when I flash. Also I highly suggest reading all of the FAQ's on Romraider's website before flashing your car! Make sure you fully understand the possible risks of flashing your vehicle and understand completely the procedure!

There are also very cool utility/spreadsheets that can be used for those interested in tuning on their own. These utility/spreadsheets help make the tuning process easier and are helpful in finding potential problems. There is the ability to create a "road dynagraph" from your logs as well as boost graphs,AFR graphs,timing......what ever info you want to plot! Very cool for fine tuning! Also there is a down and dirty Newbie tuning guide available on NASIOC created by Bad Noodle. It is recommended to have a good set of gauges. Boost/Vac(psi/inHg),EGT and oil pressure. Wideband is highly recommended for any engine management but crucial for self tuning. I highly suggest reading as much info as possible before just jumping into tuning on your own. Please read the info first,then ask questions!

Software:
Romraider (editor/logger) www.romraider.com
Ecuflash (editor/flash utility) Main Page - OpenECU
Ecuexplorer (logger/flash utility)
Ecuedit (editor/logger/flash utility) ecuEdit • Index page
Virtual Dyno Virtual Dyno - Standalone Log Analyzer - NASIOC

Hardware:
tactrix
EvoScan OBDII Mitsubishi MUTII DataLogger Scantool

Tuning/user info:

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / ECU
A Complete Tuning Guide - NASIOC
RomRaider - Open Source ECU Tools | Documentation / Rom Raider FAQ
RomRaider - Open Source ECU Tools | Documentation / Tuning FAQ
RomRaider/Ecuflash getting started FAQ - NASIOC
RomRaider • View forum - Tuning Utilities and Spreadsheets
RomRaider • View forum - How-To Guides
RomRaider • View forum - Base Maps
RomRaider • View topic - Turbo dynamics and boost control explained
RomRaider • View topic - Subaru's knock control strategy explained
RomRaider • View topic - Closed Loop to Open Loop fueling transition explained
OPENSOURCE HOW TO: Flash your ecu useing opensource software - Subaru WRX Forum: WRX Forums
YouTube - How to flash a map to your Subaru using EcuFlash
OSecuroms & XPT Tuning •Index page
02 Open Source NO Programming Voltage - NASIOC
programming voltage is 4.2 volts programming voltage is too ECU FLASH ERROR - NASIOC

PhatBotti Tuning - Tuning FAQ & Misc Info - NASIOC
Books:
Amazon.com: How to Tune and Modify Engine Management Systems (Motorbooks Workshop) (9780760315828): Jeff Hartman: Books
Amazon.com: Engine Management: Advanced Tuning (9781932494426): Greg Banish: Books
Amazon.com: Maximum Boost: Designing, Testing, and Installing Turbocharger Systems (Engineering and Performance) (9780837601601): Corky Bell: Books
Amazon.com: Turbo: Real-World High-Performance Turbocharger Systems (S-A Design) (9781932494297): Jay K. Miller: Books

Misc Tuning info:
Engine Management FAQ: Read if you are thinking of buying one! - NASIOC
Full DIY: GM solenoid install (56k warning) - NASIOC
new hybrid mbc/ebc method of boost control - NASIOC
RomRaider • View topic - 16bit Boost Control
RomRaider • View topic - Help me steady my boost during spool
RomRaider • View topic - gm bcs tunning help
RomRaider • View topic - FMIC tuning.. Anybody?
RomRaider • View topic - Tuning for a larger TMIC
RomRaider • View topic - How to tell if turbo efficiency is maxed?
How to adjust your wastegate arm - Subaru WRX Forum: WRX Forums
Aftermarket Boost Control Solenoids - Subaru WRX Forum: WRX Forums
Questions regarding GMBCS - Subaru WRX Forum: WRX Forums
http://www.cobbtuning.com/Technical-Articles-s/70675.htm
Boost Spike vs. Boost Creep
Vag-Com cable resource thread - NASIOC
How Subaru’s Factory Boost Control System Works - COBB Forums
RomRaider • View topic - Why MBC's?



ATTN: If your post in not related to the topic, it will be removed/deleted. - Rogan
 
#8 ·
Rogan said:
Ron, keep me posted, if I miss clutter in here, I'll delete it. This should be kept ON TOPIC, in my opinion.

Thanks for the great post-it
Image
:thumbup:
xsnapshot said:
+1 to the sticky.

Wow....its like you were reading my mind....haha. Seriously though, good timing. I'm planning on switching to opensource around thanksgiving, and selling the accessport as soon as the switchover is complete.
Thanks guys!!
 
#4 · (Edited by Moderator)
I vote Sticky. Thanks a bunch for doing this. 👍

I find that when this comes up many new folks don't understand the basic terminology of what a map is or what a tune or log is. It would be helpful to clarify that as well. Some of that is probably in the "do you need a tune" sticky though.

Also, I think it is worthwhile to make a comparison with the Accessport, however it would be fair to specify specifically how it compares instead of a general statement. I.e. they both serve the same function of flashing a map to your ECU (whether it be a Cobb map or an opensource map). NO maps are guaranteed in terms of they will fix your car if it breaks. There are a number of features that the accesport has for in car monitoring in a portable format etc. while opensource/romraider has advantages for logging.

Last thought, I think it would help a lot if the information on what can be logged or observed with learning view and the basic indicators that a map is running safely were highlighted.

Oh yeah, maybe have Romraider and or Tactrix in the title along with "open source" (vs. opensource) for searching.

... and this is nice for road dynos: Data Log Lab
 
#7 · (Edited)
Also, I think it is worthwhile to make a comparison with the Accessport, however it would be fair to specify specifically how it compares instead of a general statement. I.e. they both serve the same function of flashing a map to your ECU (whether it be a Cobb map or an opensource map). NO maps are guaranteed in terms of they will fix your car if it breaks. There are a number of features that the accesport has for in car monitoring in a portable format etc. while opensource/romraider has advantages for logging.

Last thought, I think it would help a lot if the information on what can be logged or observed with learning view and the basic indicators that a map is running safely were highlighted.

Oh yeah, maybe have Romraider and or Tactrix in the title along with "open source" (vs. opensource) for searching.
I didn't really want to get into comparing to AP because then I have to do Ecutek, Utec,standalones. Alot of that stuff is covered in other stickies here I think and Unabomber's Manafesto. As far as what needs to be logged and stuff I also didn't want to get into explaining to much. Bad Noodle's guide covers alot of this as well as some of Romraider's guides. For most buying a premade map the tuner will tell you what parameters they want logged. The nice think about learning view now is the for the timing the bad numbers are highlighted in red. Maybe I will go back and give a small tutorial like you suggested on how some of the tools work and what to log. The part that most people don't understand is these things will/do take time to learn and you have to invest time in playing with the programs/utilities/spreadsheets in order to use them. It's just like learning to ride a bike or play an instrument. It's not going to happen overnight. The even harder part is there are no real manuals for most of these programs but the Opensource community is very supportive.

hold fast said:
Donkey, out of the four books you listed, which would you recommend to start with?
Honestly either "Maxium Boost" or "Turbo: Real World High Performance Turbocharging Systems" These books are the basics. If you don't understand how turbocharging systems even work or the components in them,there is no reason to be trying to tune them in my opinion. You gotta to walk before you can run.

__________________
 
#5 ·
Stuck.

Ron, keep me posted, if I miss clutter in here, I'll delete it. This should be kept ON TOPIC, in my opinion.

Thanks for the great post-it :) :thumbup:
 
#15 ·
when I had my V1, I could use/look/manipulate the Cobb maps with StreetTuner (which I still have, and reminds me, I should sell it.)
Otherwise, what Donkey said hold true.
 
#20 ·
what works for a 2012 wrx with a torqued performance tune. the tactrix web site says to use ecuflash but it doesnt have a preset ecu processor to select that is for the 2012 only up to 2009 i think. it asks if i want to go in some mode and then says warning for developers only. if i could get any help that would be awesome i am trying to tune my car tonight and so far having no luck.
 
#21 ·
#24 ·
Looking at selling my accessport and jumping into the world of Opensource Tuning! Question though, if I don't plan on doing any editing of the maps myself, I.e using the TP maps (for now), should I have a wideband afr?? Can I use the tactrix cable and one of those programs to log the same parameters as I can now with the accessport?

Thanks!

Great writeup btw Donkey! :)
 
#25 ·
J_Maher_WRX said:
Question though, if I don't plan on doing any editing of the maps myself, I.e using the TP maps (for now), should I have a wideband afr??
If you want to monitor your open-loop AFRs, yes.

J_Maher_WRX said:
Can I use the tactrix cable and one of those programs to log the same parameters as I can now with the accessport?
Romraider allows you to log.
 
#28 ·
I have a question about tunes that you get off of the Internet as far as a tp tune or something that I do my self. By the way I have a tp stage one tune as of now. But my question is I live in AZ and it gets to around 115 here in the Sumer and I just went to a local shop and they say that if you don't get it dyno tuned here during the summer that there is a possibility you can hurt your engine because of the heat and that he has heard of people doing open source tunes and then there motor blows because they are tuned for colder weather. I hope you guys understand the question haha. Sometimes I ramble.
 
#30 ·
Donkey and Rogan have been busy with off site obligations lately - anyone know what happened to wrxmodders? If we can find the links I can fix them but nothing comes up in a brief search.
 
#34 ·
i cant seem to find any clear answer as to what cable / cord to buy i cant afford 250 dollars for tantrix 2.0 im not cheap i just have alot of money going out and i have to get my sti runningfor work/fun i traded a diesel truck for this car and been 3 months and car is constantly broken i just found this club and could real use a helping hand as all parts i got to fix /improve car are gonna make it run lean. please any help i have tuned cummins motor simply by ajust and drive install and do again to the upwards of 500wrhp with minamal parts and lots of fab work i am capible if thing are explained as if i was two. lol sorry if im in wrong spot i mean no disrespect
 
#37 ·