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I have posted before about difficulties with the throttle response of my 09
2.5 NA in a 82 Westy diesel, 5spd, installed by SC. I have about 2.5K miles
on it now and have been unhappy with the way the throttle responds, being
too much power in the first third, less in the second third and almost no
new power in the last third. This made it difficult to drive smoothly and
gave a very nonlinear feeling. Others have reported the same difficulty with
late throttle-by-wire Systems, especially in off road driving. I was gearing
up to do a complicated remapping and reprogramming of the ECU to try to get
a more linear response.



But then I seem to have stumbled on a fix, at least for my system. One thing
I like about TBW is the ease of installing Cruise control-no vacuum
actuators, cable or any of that. It's all done by the ECU thru the
electronic throttle. Someone has already figured all this out and posted it
in Files. He had almost the same setup as me, and ran into the same
problem-his ECU was for an auto trans although he was running am MT as I am.
And the CC couldn't be hooked up because the CEL was on all the time due to
a code P0600, generated by the fact that the ECU is looking for a AT control
computer that isn't there. This also prevents the CC from working and makes
hooking up the CEL a waste of time. When I read his article in files I went
and checked, and sure enough I had the same PN ECU, designed for an AT and
throwing the same code. The fix is to get an MT ECU-just one number in the
PN is different. Just one ECU wire has to be grounded (C15) (this is a
signal wire to tell the ECU that an MT is installed.) and all these problems
are solved. I got one for $90 on ebay and installed it and found it also has
a different throttle response more appropriate to an MT. The response is
linear all the way to full throttle now and it sure seems like I have more
power. Problem solved!



All this makes perfect sense, that Subaru MT and AT would use different
throttle response MAPS. MT Subs would probably be jerky too if you installed
an AT ECU.



The article in Files, with the PNs can be found here

ntrol/



Dennis



[Non-text portions of this message have been removed]

Hi Dennis,
Good work Dennis - but it would be very helpful for others if you
summarized the following info for your conversion:
a) Engine - 2009 EJ25
b) Model of donor vehicle -
c) From A/T donor
d) ECU part # from donor - 22611-?????
e) M/T ECU part # that solved your problem - 22611-?????

Thanks for sharing your information,
Tom

--- In subaruvanagon@...
<mailto:subaruvanagon%40yahoogroups.com>, "dennis miller"
<bindu56@...> wrote:

I have posted before about difficulties with the throttle response

of my 09

2.5 NA in a 82 Westy diesel, 5spd, installed by SC. I have about

2.5K miles

on it now and have been unhappy with the way the throttle responds,

being

too much power in the first third, less in the second third and

almost no

new power in the last third. This made it difficult to drive

smoothly and

gave a very nonlinear feeling. Others have reported the same

difficulty with

late throttle-by-wire Systems, especially in off road driving. I was

gearing

up to do a complicated remapping and reprogramming of the ECU to try

to get

a more linear response.



But then I seem to have stumbled on a fix, at least for my system.

One thing

I like about TBW is the ease of installing Cruise control-no vacuum
actuators, cable or any of that. It's all done by the ECU thru the
electronic throttle. Someone has already figured all this out and

posted it

in Files. He had almost the same setup as me, and ran into the same
problem-his ECU was for an auto trans although he was running am MT

as I am.

And the CC couldn't be hooked up because the CEL was on all the time

due to

a code P0600, generated by the fact that the ECU is looking for a AT

control

computer that isn't there. This also prevents the CC from working

and makes

hooking up the CEL a waste of time. When I read his article in files

I went

and checked, and sure enough I had the same PN ECU, designed for an

AT and

throwing the same code. The fix is to get an MT ECU-just one number

in the

PN is different. Just one ECU wire has to be grounded (C15) (this is a
signal wire to tell the ECU that an MT is installed.) and all these

problems

are solved. I got one for $90 on ebay and installed it and found it

also has

a different throttle response more appropriate to an MT. The response is
linear all the way to full throttle now and it sure seems like I

have more

power. Problem solved!



All this makes perfect sense, that Subaru MT and AT would use different
throttle response MAPS. MT Subs would probably be jerky too if you

installed

an AT ECU.



The article in Files, with the PNs can be found here

ntrol/



Dennis

Thanks Tom. I will put all the info in one place-a good idea.



The engine and 5 spd were installed by SC so I don't have all of the info,
but here is what I have.



Engine-2009 EJ25

Model-Impreza.

Model of donor vehicle-- The engine is 09 Impreza, but don't know exact
model. The ECU that was installed is listed as an 07 Imprezza Outback AT
using a 09 harness.

ECU PN from donor AT vehicle--22611AM450 07 Impreza Outback AT

ECU PN from MT vehicle, replacement that solved the problems--22611AM440 07
Impreza Outback MT

Maybe they revised it for 07-who knows. I just know it worked for me and it
has made all the difference. I'm only in my second day with the new ECU and
it is still optimizing but it is so much easier to drive. Having more
control of the throttle has made it easier to feather the clutch and I may
not have to change the clutch cylinder to a smaller diameter, as I was
planning to. It is much easier to hold a speed on the hyway also without so
much concentration.



The AT ECU would be at full throttle at about 3/4 gas pedal and push to the
floor would give no more power. Is yours like that?



With this MT ECU full throttle gives full throttle-and it seems to be giving
me a little more power overall.