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Old 02-27-2011, 07:09 PM   #1
jrigby
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Default Mythbusting the STI ecu swap and no cruise control

Ok so looking through a ton of threads on this, the cruise control issue seems to have carried from 1 thread (post#21. In it the guy used an ECU from an STI without cruise. In another thread, this guy claims that he did not lose cruise.(post#8)

There are very few people that have actually done the swap. I believe most of the talk on losing cruise control is hearsay. So if you have ACTUALLY swapped in an STI ecu, could you please comment on whether or not you lost cruise control, what year your Baja is, and can you confirm if the vehicle the ecu came out of had cruise?
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Old 02-27-2011, 08:58 PM   #2
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I have an 04 with and 04 sti ecu swap tuned open source with cruise control. I don't know if the donor sti had cruise control though. Hope that helps you out.
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Old 03-10-2011, 07:43 PM   #3
bajaturk
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I also have an 04 with an 04 STI Ecu swap. I DO NOT have working cruise control since the swap out.
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Old 03-11-2011, 01:53 AM   #4
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Any way you guys would be willing to check the part numbers off your ECU's?
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Old 03-11-2011, 04:49 PM   #5
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It will be hard for me to check since my car is down for a year or so and at my buddy's house. Sorry.
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Old 03-18-2011, 05:54 PM   #6
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OK, so I just tried an STI ECU in my 2005 baja and it was a no go for cruise. I know theres a few different versions and this was an older one. 22611AJ241, my baja's ecu is a 22611AJ960.

I know there's a cruise control module, and they have different part #'s. The forester also uses a different cruise module, and it still works with the STI ecu. So it may not be the difference. I've also been going over the wiring diagrams for the baja and the STI and I'm finding very minor changes but nothing thats a clear "swap this wire with that one."

Wiring diagrams if any one wants to take a look. I am far from educated when it comes to these.

STI cruise 1

STI cruise 2

Baja cruise 1

Baja cruise 2


I can get any other diagram if needed. Just let me know.
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Old 03-20-2011, 01:12 PM   #7
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if you are highly versed in electronics and are thinking about field hacking the wiring from a working module to a non working. Let me know how it turns out for you.

I attempted this early on and was quickly overwhelmed.

As you say there is no clear cut swap to make this an easy mod.
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Old 04-05-2011, 08:59 AM   #8
PHATsuby
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Why wouldn't someone just use a FXT ecu? Wouldn't this be an easier route? I'd think these would be more identical and they have AP support also if that is what you are looking for.

Has anyone swapped it with a FXT ecu and kept cruise?

Ben
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Old 04-05-2011, 12:26 PM   #9
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I believe the intent is to be able swap in the 04 sti ECU, turbo, injectors without tuning. With the FXT ecu they would still require a tune........same as keeping their Baja turbo ecu
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Old 04-05-2011, 11:17 PM   #10
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Yea makes sense, but I thought the Baja did not have the AP support if someone wanted it over the open source. Also I feel like putting the STi ecu on there even though you have the injectors, turbo and TMIC still could be a bit risky. The heads are not the same. Maybe it has enough learning ability so it doesn't matter. Obviously if people have done it and logged their cars and it is knock free then that is good.

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Old 04-06-2011, 02:51 PM   #11
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Did the Baja get smaller injectors than the FXT? In my '04 FXT I swapped the '04 STi ecu over without any issues, and without changing injectors since the STi and FXT came with the same sized injectors, just different turbo's and tmic's.
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Old 04-06-2011, 03:38 PM   #12
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I keep seeing these questions come up.

I hope that everyone knows that all you need is a Utec Delta to use the stock ECU.
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Old 04-06-2011, 03:49 PM   #13
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I've been running a FP 68HTA @ 21 psi for almost a year now.

EJ 257 with CPs.

EJ 255 heads.

Full supporting mods.

STOCK ECU, TurboXS Utec Delta & Tuned by Area1320 in Easton Pa.
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Old 04-06-2011, 08:11 PM   #14
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Quote:
Originally Posted by singincanary View Post
Did the Baja get smaller injectors than the FXT? In my '04 FXT I swapped the '04 STi ecu over without any issues, and without changing injectors since the STi and FXT came with the same sized injectors, just different turbo's and tmic's.
The 04-05 Baja turbo is the same engine as the 04 FXT. It is the same injector as the FXT and the STI.

And the Heads ARE the same. the part number is the same. the cams are the same the valves are same etc. etc. etc. (of course later model EJ255 heads are different)
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Old 04-06-2011, 08:22 PM   #15
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Quote:
Originally Posted by Subie_Sleeper68 View Post
I keep seeing these questions come up.

I hope that everyone knows that all you need is a Utec Delta to use the stock ECU.
And I hope that everyone knows you can run the stock ECU without wasting money on a Utec.

Seriously though, people want to use an STI ECU so they can put on an STI turbo, intercooler, and exhaust and just plug and play an ECU with nothing else. And then all they have to do from there is an AP if they want something more down the road. So it is worth looking into.

There are tons of engine management options out there. factory ECU, Reflash of the factory ECU, piggyback, stand alone etc.
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Old 04-07-2011, 01:32 AM   #16
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Quote:
Originally Posted by Hawk296 View Post
And I hope that everyone knows you can run the stock ECU without wasting money on a Utec.

Seriously though, people want to use an STI ECU so they can put on an STI turbo, intercooler, and exhaust and just plug and play an ECU with nothing else. And then all they have to do from there is an AP if they want something more down the road. So it is worth looking into.

There are tons of engine management options out there. factory ECU, Reflash of the factory ECU, piggyback, stand alone etc.

This ^

I have no tuning knowledge and all the E-tuners I talk to want me to switch over to an STI ecu anyways.
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Old 04-07-2011, 08:11 AM   #17
Subie_Sleeper68
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Quote:
Originally Posted by Hawk296 View Post
And I hope that everyone knows you can run the stock ECU without wasting money on a Utec
WOW. Hardly a waste man.

I started with a new 06 Baja Turbo.

I wanted STi power out of it. Sooo

I put the VF39 (standard STi turbo at the time) & STi TMIC on it.
Cobb had/still has NOTHIN' for Baja management & was less than helpful when I asked if a FXT unit would work. So I went open source, first.
The Baja was more fun, but nowhere NEAR an STi. Barely kept up with WRXs.

My fault, I didn't factor weight & driveline differences in when I only put STOCK STi parts on.

I got the Utec for quick map switches & more options for my tuner. A mix of open source & Utec tune on ANY Subaru ECU is IMHO the best of both worlds.

If someone just wants to go a little faster with STi parts & bolt ons it STILL let's the tuner do MORE than open source, because there are 5 selectable maps. Via push button. No cables, no waiting.

Rant\

Sorry, just got a bit torqued up at the "Waste" part. LOL
In ALL the trial & error I've gone through to get mine to reliable high horsepower (for a Baja) DD status, the Utec is by far the mod that made it easiest for my tuner.
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Old 04-07-2011, 09:55 AM   #18
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Hey man just making a point. It was not intended as an insult.

I only said "waste" because you mentioned an STI ECU being a waste. It might be for you, but this thread is related to questions about using an STI ECU in a Baja, not if doing so is the best option for Subie_Sleeper68. If people are simply looking for an STI powerplant in a Baja, than a UTEC can be seen as a waste in the same sense, as it is not needed. Lets keep it on track for those who decide to go the STI ECU route.

In reality most people who don't have time, money or knowledge to do the ECU calibrations themselves (which is a majority) will go to a performance shop or person who has knowledge and experience doing so. These shops all have their opinion on what is the best engine management option and that is typically what they are most comfortable with or what they sell. Most of them can achieve the same results safely.

Your car has turned out excellent, probably one of the quicker ones around and you have done a wonderful job with it. But it's not for everyone. It comes off equally as harsh as I may have been when you come into their thread telling them the route they are going (which may be best for them or their tuner) is a "waste" That is all,

If you would like to further discuss this you can always send a PM.

As far as STI ECU use-
We need to know what model year Baja people have and what model year and number the STI ECU is and of course if cruise works or not. Hopefully we can find which ECUs will work with which Bajas.h

The forester XT and STI are both based on the Impreza platform. The Baja turbo was based on the previous generation Legacy platform when it was released and was the only car based on this platform in North America to be turbocharged so it is not surprising some things may be different.
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Old 04-07-2011, 11:36 AM   #19
Subie_Sleeper68
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I see what you're saying.

Apologies to those who are trying to figure out the aforementioned issues with cruise etc. on a Baja with an STi ECU. I'm not sure if a Utec for an STi would even clear it up if it's a harness/ECU pin out issue.

I guess I got into a "Don't bother with ECU swap 'cause it's not needed mode" because of how MY build went.

I completely dismissed that people already HAVE the STi ECUs in their cars & are having issues. Again, I apologize for my one track solution attitude. I wish you all the best of luck. & I will recommend calling Germaine Riddick @ TurboXS in Gaithersburg Md. to see if a Utec for an STi will clear up the problem. Used ones can sometimes be had for 2-3 hundred. New are a bit more than an AP .

Good luck. I hope you guys find the solution you're looking for without having to buy anything else.
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Old 04-07-2011, 10:55 PM   #20
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bajaturk, is your car a manual or auto? I am curious if there is a difference in the canadian versions if yours is from Canada?

Obviously I'm assuming you all looked at this but I was comparing the 2004 Baja ECU pinout to the 2004 STi and they are identical, except the baja does have 2 CAN communication wires on B137 18 & 26.

Not sure if that matters or if the CAN is used on the cruise at all for the Baja. I need to look at the diagrams but there has to be an element we are missing if one 04 to 04 swap worked and another didn't. I can't believe there aren't more people who did this.

Ben
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Old 04-08-2011, 02:20 PM   #21
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For those that have that did the ECU swap, and lost Cruise, is your Cruise Control Button Blinking; and are you stuck in OPEN LOOP?
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Old 04-11-2011, 05:23 PM   #22
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Quote:
Originally Posted by honda killer View Post
For those that have that did the ECU swap, and lost Cruise, is your Cruise Control Button Blinking; and are you stuck in OPEN LOOP?
No, the cruise on off button lights up and stays lit when pushed. The dash light doesn't come on at all. Basically when you use the set/accel/cancel switch nothing happens.
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Old 04-11-2011, 05:30 PM   #23
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Quote:
Originally Posted by jrigby

No, the cruise on off button lights up and stays lit when pushed. The dash light doesn't come on at all. Basically when you use the set/accel/cancel switch nothing happens.
Sounds like "the lights are on but nobody is home". Meaning the switch is receiving power, but the ecu isn't getting the signal.
I bet the cruise control button , on the STi, is mounted on the steering wheel not the council.

I bet you need to upgrade your steering wheel and center gauge cluster; or re-wire your cruise control button for the ECU's sake.

GL

Last edited by honda killer; 04-12-2011 at 07:22 AM.
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Old 04-12-2011, 07:28 AM   #24
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Just for *****s and giggles would you mind hooking a code reader; and see if there's a CEL. Since the cruise control button is not recoginized by the ECU, I wounder if the center gauge cluster will eluminate the CEL light.

If you don't find anything the first time, then enduse a fault condition like:
-unplug the front O2 sensor (which will send a low/no signal)
-unplug the TPS sensor (sends a low reading)
-DO NOT unplug any TGV sensors, as they are a pain in the ass to install
-Unplug the MAF (sends a low reading)
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Old 04-12-2011, 08:18 AM   #25
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why just opensource tune the car.
ej255 with side feed, 04-05 are same size injectors as STI, yellow ones.
you would only have swap turbo & tmic. yes tbe would be helpful.

i understand the OP wanted to do. swap with out a tune.
but it stands to reason to get the most "reliable" power out of
the set up, a custom tune would be the way to go.

I have and still do tune utecs, stock ecu's, other forms of em.

but the easiest swap would be turbo, tmic & tune.
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