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Old 10-06-2004, 03:34 AM   #1
Patrick Olsen
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Default Will a Phase I DOHC run using a Phase II SOHC ECU?

Seeing Matt Monson's thread about I-speed's RS ECU reflashing has me wondering about my tuning options. As it is now there are tuning options available for the '99-01 RS's (SOHC) using the I-speed RS Reflash, and for '01+ cars of all flavors (all SOHC for the N/A cars) using EcuTek Reflash, but nothing for the DOHC Phase I ECUs. So I'm thinkin' I could just get myself a SOHC ECU, and then use the reflashing capability to improve performance. I just don't know how different the ECUs actually are, or if a newer ECU would even install in my car. Would I need to completely re-do the wiring harness, or are the pin-outs the same? Etc etc etc...

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 10-06-2004, 10:20 AM   #2
ruskiyab
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I'm no tech or anything, but I imagine it would not work because the fuel maps would seem to be completely different, also the phase 1 uses a MAF sensor, an 00+ ECU will be looking for a different signal from a MAP, idk, though, I just wouldnt think itll work
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Old 10-06-2004, 12:54 PM   #3
jeffg
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The ECU will work, but you will need to swap out several sensors. Some that come to mind:
MAF-> MAP
cam position sensor

I know there was a whole list, I looked at doing the same thing, but the other way. sohc with dohc ecu.
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Old 10-06-2004, 06:05 PM   #4
jamesfacts
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Isn't phase II early99+? If so, why would he have to swtich sensors?
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Old 10-06-2004, 06:08 PM   #5
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Quote:
Originally Posted by americanyouth
Isn't phase II early99+? If so, why would he have to swtich sensors?
It's not that simple... some Phase II motors used MAP ('00+) and some used MAF (99). Those cars have different ECUs.

I would think that a '99 RS ECU would work in your car, Pat, but not a later ECU unless you swapped over all the sensors it needed.

The Hydra EMS Nemesis should work, they support the '98+ RS which includes the DOHC Phase 1 just like yours. You'll probably have to custom wire it to fit your harness, but that's no big deal.
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Old 10-06-2004, 06:26 PM   #6
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If you're looking to buy a 2000 RS ECU, I have one.
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Old 10-07-2004, 02:41 AM   #7
Patrick Olsen
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Quote:
Originally Posted by Porter
The Hydra EMS Nemesis should work, they support the '98+ RS which includes the DOHC Phase 1 just like yours. You'll probably have to custom wire it to fit your harness, but that's no big deal.
I hadn't heard of the Hydra before, did a quick search and I see lots of posts over in the Engine Management forum. Looks like I have some reading to do. You're sure they offer it for N/A cars - their website only lists WRX and STi.

Pat
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Old 10-07-2004, 03:17 AM   #8
subiekid
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Quote:
Originally Posted by Patrick Olsen
I hadn't heard of the Hydra before, did a quick search and I see lots of posts over in the Engine Management forum. Looks like I have some reading to do. You're sure they offer it for N/A cars - their website only lists WRX and STi.

Pat

lots of the AFI guys are running them. they seem to like they hydra. I looked at the site, the software seems easy to use.
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Old 10-07-2004, 10:12 AM   #9
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http://www.hydraems.com/ems-index.html

Hydra is the company who makes the hardware and supports it.

Phil Grabow at Element Tuning has been customizing these for the WRX and STi and providing custom maps. He is a dealer/distributor for Hydra.

Contact Hydra directly and see who they would recommend to integrate the unit for you and what you could expect in terms of tuning and power delivery on a Legacy.
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Old 10-07-2004, 11:32 AM   #10
Patrick Olsen
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Ahhh, I see. Thanks for the clarification, Porter, I had just seen the Element Tuning links in the threads I browsed through.

Pat
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Old 10-07-2004, 06:16 PM   #11
ilmaestro
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I believe a hydra would eliminate the need for a reflash, because you'd basically be replacing your ECU with the hydra. The goal, I assume, would be to keep a stock ECU and just flash it.
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Old 10-08-2004, 12:26 AM   #12
Patrick Olsen
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Well, I don't necessarily have to keep my stock ECU. The car just doesn't run right, and has gotten progressively worse over time. The car has a band where it hesitates and pulls timing - used to be it was just a small portion of the mid-range, now it happens all the way up to 5000rpm. Very annoying, and seriously restricts the mid-range power of the car.

Pat
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Old 10-11-2004, 01:27 PM   #13
Section 8
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Cam sensor is a generic Hall effect sensor. The cam pulley has a different number of teeth/nubs (whatever you want to call them) on the back to locate the cam.

cheeRS,

Greg
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