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Old 10-03-2007, 09:10 AM   #6
Scooby Specialist
Member#: 158006
Join Date: Aug 2007
Chapter/Region: TXIC
Location: San Antonio
2003 WRX IdleWagon
1992 GVR4 379/1000


Wanted to post an update so people could possibly tune a Perrin EBCS themselves if they so desire.

First I Took the WGDC table and cut all the numbers by 75%. I also took both Dynamic tables and cut those numbers by 50%, making sure I kept my negative numbers negative.

I found stretch of road allowing for WOT pulls and places to stop to tune. My first run was showing boost error of about 9 lbs, RPM dependant. I started to blanket raise the WGDC up incrementally by 10%. The higher the WGDC numbers got, the smaller % I used since my base numbers were getting larger.

I compared the Boost Error numbers by RPM to my WGDC map and found places I could increase WGDC by RPM to achieve target boost at lower RPM's.

If I found that I was getting fluctuation in boost at certain RPM's, I would Decrease the Burst/Cont duty cycle for the given RPM.

Since this was my first real road tune it is taking me a long time but so far my results are showing good progress. I have cut my boost error down to less than 2 Psi after about 2 hours of tuning.

I ran into a problem where my IAM started to drop from 16 down to 12 at WOT for some reason. I was at about 1/8 tank of gas and per my own mantra, I figured easiest solution first so I topped it off with some 93 octane. 3 logs later I haven't dropped my IAM's at all.

I figure about 2 more hours of tuning and I will have the boost totally under control. Next step will be tuning the Ignition map a bit more.

I certainly don't have the knowledge to do this to someone else's car but for my own car I feel pretty good about it, plus I work cheap.

Thanks for the replies I got they did really help me out alot. I was beginning to doubt that anyone actually read the EM forum at all, which to me, is mind blowing.

/Brox - Amateur Open Source Tuner in Training
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Broxma is offline   Reply With Quote