legacycentral bbs

Does anyone have the ability to get inside the ECU and read the info
in there? I am interested in just about everything, but specifically
the fuel, boost, and ignition maps. I want to know what is affected
by the detection of knock by the knock sensor; just ignition timing
or is boost and fuel also altered?
I have done some experimenting of my own. I had a knock sensor go
bad, and when this happens, it's a pain in the rear. The ECU
realizes the knock sensor is not functioning properly, and defaults
to some PISS-POOR maps. I'm talking full throttle just barely
accelerates the car. AS soon as the knock sensor is replaced, the
ECU SLOWLY (100-200 miles) returns to normal as it samples driving
conditions and advances spark as much as it feels is safe, degree by
degree. I have also moved the knock sensor from it's normal position
on the block to the intake manifold (there is a perfect place for it
on the EJ20 manifold I have.) The ECU still thinks the knock sensor
is working fine, but now the sensor is so far from the cylinders that
I believe it can't detect anything. After the ECU learns this new
condition, performance improves a great deal. I'm talking 10-20 hp,
stuff you can really feel, not just "yeah, it seemed to help." There
is no doubt. I assume the ECU advanced the ignition timing as much
as it possibly can, however much advance was built into it. But can
this be the only cause of my increased power? Has the fuel map been
changed? Has boost been increased? I could check boost easily
enough, but my boost gauge is being borrowed. A couple things to
keep in mind; I am running the stock EJ22 ECU with my intercooled
EJ20. Since the EJ22 did not have an intercooler, I suspect the
ignition maps are very conservative, that is why I can move the knock
sensor without destroying my motor. On VERY hot Texas summer days,
when I have sat at a light for a while, I will notice some audible
pinging when I start to move. But as long as I use little throttle,
this stops when the intercooler has some fresh air through it. For
the chicken-littles out there, I have been running without
the "modified" knock sensor for ~20,000 miles, with no problems. No
broken rings, no melted pistons, no broken rods. Keep in mind that
when Subaru programmed the ignition maps into the ECU, it had to take
into account the bumbling idiots out there who go 10-15,000 miles
between oil changes, use 87 octane only as a last resort when 85 or
lower isn't avaiable, who don't even know what a spark plug, spark
plug wire, or air filter is, let alone have ever had them changed.
Therefore the maps will be quite conservative to prevent these
ignorant people from destroying their motors and blaming Subaru.


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Hey Justin, nice to hear that you're still out there!

I wish i could help, but the only info i get from my ECU is what my
AVC-R gets from it, which doesn't include anything about the knock
sensor. I do know that the J&S Safeguard system is really nice and
even has a monitor you can use to know exactly where the timing is
and what it's doing.

--- In BC-BFLegacyWorks@y..., scoobybrande@n... wrote:
> Does anyone have the ability to get inside the ECU and read the
info
> in there? I am interested in just about everything, but
specifically
> the fuel, boost, and ignition maps. I want to know what is
affected
> by the detection of knock by the knock sensor; just ignition timing
> or is boost and fuel also altered?
> I have done some experimenting of my own. I had a knock sensor
go
> bad, and when this happens, it's a pain in the rear. The ECU
> realizes the knock sensor is not functioning properly, and defaults
> to some PISS-POOR maps. I'm talking full throttle just barely
> accelerates the car. AS soon as the knock sensor is replaced, the
> ECU SLOWLY (100-200 miles) returns to normal as it samples driving
> conditions and advances spark as much as it feels is safe, degree
by
> degree. I have also moved the knock sensor from it's normal
position
> on the block to the intake manifold (there is a perfect place for
it
> on the EJ20 manifold I have.) The ECU still thinks the knock
sensor
> is working fine, but now the sensor is so far from the cylinders
that
> I believe it can't detect anything. After the ECU learns this new
> condition, performance improves a great deal. I'm talking 10-20
hp,
> stuff you can really feel, not just "yeah, it seemed to help."
There
> is no doubt. I assume the ECU advanced the ignition timing as much
> as it possibly can, however much advance was built into it. But
can
> this be the only cause of my increased power? Has the fuel map
been
> changed? Has boost been increased? I could check boost easily
> enough, but my boost gauge is being borrowed. A couple things to
> keep in mind; I am running the stock EJ22 ECU with my intercooled
> EJ20. Since the EJ22 did not have an intercooler, I suspect the
> ignition maps are very conservative, that is why I can move the
knock
> sensor without destroying my motor. On VERY hot Texas summer days,
> when I have sat at a light for a while, I will notice some audible
> pinging when I start to move. But as long as I use little
throttle,
> this stops when the intercooler has some fresh air through it. For
> the chicken-littles out there, I have been running without
> the "modified" knock sensor for ~20,000 miles, with no problems.
No
> broken rings, no melted pistons, no broken rods. Keep in mind that
> when Subaru programmed the ignition maps into the ECU, it had to
take
> into account the bumbling idiots out there who go 10-15,000 miles
> between oil changes, use 87 octane only as a last resort when 85 or
> lower isn't avaiable, who don't even know what a spark plug, spark
> plug wire, or air filter is, let alone have ever had them changed.
> Therefore the maps will be quite conservative to prevent these
> ignorant people from destroying their motors and blaming Subaru.


------------------------ ---------------------~-~>
Make good on the promise you made at graduation to keep
in touch. Classmates.com has over 14 million registered
high school alumni--chances are you'll find your friends!
http://us.click.yahoo.com/l3joGB/DMUCAA ... /X7OVlB/TM
---------------------------------------------------------------------_->

To unsubscribe from this group, send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com