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reset ecu or re-map????
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Old 12 Jun 2006, 07:53 AM   #1 (permalink)
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reset ecu or re-map????

hi i got this impreza about half a year ago, just before i bought it it had been de-cat. i have had problems with it overboosting ( as if im keeping my foot on accelerator for to long with out changing gear but it happenes straight away sometimes). been told its the de-cat.
do i need to have it remaped or if i reset the ecu iv heard it learns how the car runs for the first hundred or so miles.

please any advise

thanks
Eddie
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Old 12 Jun 2006, 07:56 AM   #2 (permalink)
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Any details on the car i.e. model & age etc.
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Old 12 Jun 2006, 08:02 AM   #3 (permalink)
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95 turbo wagon, not much done on it under the hood, decat, few pods,dump valve.
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Old 12 Jun 2006, 08:04 AM   #4 (permalink)
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the earlier models cannot be remapped without changing ecu i.e. Apexi or similar.

I would suggest the fitting of an electronic boost controller as an easier solution.

http://www.blitz-uk.co.uk/electronics.html

Scroll down to the type S.
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Old 12 Jun 2006, 08:59 AM   #5 (permalink)
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Quote:
Originally Posted by jd
the earlier models cannot be remapped without changing ecu i.e. Apexi or similar.
Not strictly true. Bit of trickery goes on inside the ecu but is rather limiting as to what you can do with it. For far more scope upgarde the ecu is the best option agreed.

Apexi ecu and commander. Great bit of kit and reasonably priced if you look in the right place.
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Old 12 Jun 2006, 09:00 AM   #6 (permalink)
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thanks. is it possible that i have one of these fitted already (or something similar) with the boost gauge???
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Old 12 Jun 2006, 09:02 AM   #7 (permalink)
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Quote:
Originally Posted by nozpower
thanks. is it possible that i have one of these fitted already (or something similar) with the boost gauge???
if you mean boost controler no mate, the gauge just gives you a reading, the boost controler/control valve is separate bit of kit which will control boost levels
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Old 12 Jun 2006, 09:11 AM   #8 (permalink)
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nice 1 m8. thank you v. much.
last question: are they easy to fit? or is it best having them fit by a garage.
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Old 12 Jun 2006, 09:12 AM   #9 (permalink)
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also does this mean everyone who has a decat has to get one of these?
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Old 12 Jun 2006, 09:14 AM   #10 (permalink)
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sorry no clue about fitting.

some cars get away with not needing to, and some gt remaped at the time which sorts it.

mines remapped by the way
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Old 12 Jun 2006, 09:16 AM   #11 (permalink)
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http://www.xspeed.com.au/manuals/BLI...%20English.xls

this is the manual for my boost controller.
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Old 12 Jun 2006, 09:29 AM   #12 (permalink)
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thanks for that. great site for this kind of help
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Old 12 Jun 2006, 09:32 AM   #13 (permalink)
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more than welcome mate, just post up any more questions and we'll help as we can.
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Old 15 Jun 2006, 09:47 AM   #14 (permalink)
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Firstly - These ECU's can be remapped, as have been doing them for 5 year using a ScoobyECU adaptor or a genuine chip that plugs into a spare slot on the ECU main board. UK Wagons can be setup to run about 16.11psi, WRX wagons 14.5psi (due to smaller turbo).

Although your problem can be solved by checking if the boost restrictor valve is still in place.
If it is then it would just be the case of knocking up another one slightly smaller.

The restrictor is in the return pipe from the boost control solenoid (BCS). The BCS is mounted on the front driver side strut and is a brass cylinder with 2 wires and 3 pipes going to it.

The very bottom pipe comes out of the base and returns air to the air intake/expanion box.

Inside this pipe is a small piece of brass with a hole in it. Well there should be, but alot do seem to get removed.
In some cases the pipe is missing altogether if an induction kit has been fitted.

Fitting the decat is causing the boost to spike above the standard ECU fuel-cut limit. This restrictor is there to try and prevent boost spikes.

You can tell it's there by either squeezing the pipe or by try to push a narrow screwdrive or thick piece of wire through the pipe. It's normally located just after the 90 degree bend.

As mentioned above, if you find it missing then fit one (I can give you the Pt.No is required), it should only cost a 1 or so.

If it has one fitted, then knock up something similar from brass/plastic or ally and put a smller hole in it.

Start off at about 1mm then gradually open it out until the desired boost is reached without fuel-cut/overboost.

A standard UK Wagon should boost to 11.47psi

Fuel cut limit on the standard ECU is approx 14psi. but it is stages and can kick in at lower levels depending on rpm/load.

Hope this helps ...
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Old 15 Jun 2006, 01:06 PM   #15 (permalink)
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thank you. you sound as if you know what your on a bout m8. wish i was that clued up on my scooby.
im for ever learning something new with it.

thanks again.
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