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Old 04-08-2002, 06:37 PM   #1
Scooby Newbie
Member#: 7734
Join Date: Jun 2001
Location: NJ
2017 Gti

Default A warning to those with boost control and no tuning

Here is my story. I recently installed an EBC, it is the first generation AVC-R. This unit also shows you your injector duty cycle. At stock boost levels I was running about 91-92% peak duty cycle a bit before redline. At first I thought this was very high, but I have since confirmed with Shiv and others that it is a normal level for the WRX. My next step was to install the colder plugs and pulley from my stage zero kit (I will install the rest later). At this time I decided to install the solenoid to the boost controller and check it out. I set my boost level to 1 bar. All was good until I looked at my duty, it peaked at 100%! This is no good. I turned it down to .9 bar and I was peaking around 97%. I finally settled down to .85 bar and my peak was around 93%-94%, not too much higher then stock. The stock boost controller would spike me to 1bar and then bleed off to maybe .8 bar by redline. With the ebc holding a high boost to redline I was seeing what are IMHO dangerous duty cycle numbers. I am hoping that the addition of the unichip, and leaning the fueling out at the top end will cure these high numbers. I will also be installing an EGT gauge shortly. I just wanted to give a heads up to those running high boost at redline to watch out, because on the stock fueling your injectors are probably wide open like mine were.

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Old 04-08-2002, 07:03 PM   #2
Scooby Specialist
Member#: 10228
Join Date: Sep 2001
2002 Subaru WRX


100% does not mean bad. Injectors can go up as high as 110% or more. There are other more important measurments rather then duty cycle.
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Old 04-08-2002, 08:13 PM   #3
Z1 Performance
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Member#: 9327
Join Date: Aug 2001
Location: Z1Auto.com

Thanks Mitch..beat me to it!

And using the AVC to measure duty cycle.....don't treat it as gospel, as its far from it.

You need a proper datalogger than shows IPW to calculate the IDC

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