Author Topic: Tuning solution for a my2000 v7 sti?  (Read 2321 times)

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Offline JonF

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Tuning solution for a my2000 v7 sti?
« on: January 01, 2017, 07:48:17 pm »
Hey guys, I'm looking for info on any available tuning solutions for a my2000 v7 (gdb chassis) sti. My motor is currently being built at techworks and while it is out I would like to do some supporting mods such as a full exhaust and possibly replace the vf30 due to the infamous waste gate crack.  I'm having some problems finding any ecu solutions. Before you guys get on the open source bandwagon I will tell you that a my2000 sti ecu is NOT in the list of supported ecu's on the rom raider website and many other seemingly reliable sources also say that this particular year is not capable of open source.

If anyone could give me a quick explanation of why a factory ecu can not deal with a different exhaust without a tune that would be great.  The subaru ecu seems to be pretty good,  it can adjust timing to compensate for knock or a difference in compression ratio,  and lots of other things to compensate for change,  but what is it about changing the exhaust that the ecu can not deal with?  It will still be getting a reading of everything that it needs to operate, I just can't see how it effects it that much.  What would you actually change in the ecu to make the engine work with a different exhaust?

Offline carguyjon

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Re: Tuning solution for a my2000 v7 sti?
« Reply #1 on: January 01, 2017, 08:06:27 pm »
Hey man! You could probably go open-source using Rom Raider.

Offline GrantC

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Re: Tuning solution for a my2000 v7 sti?
« Reply #2 on: January 01, 2017, 08:07:31 pm »
^---- says the guy with his v7 ecu reflashed by airboy.

Offline carguyjon

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Re: Tuning solution for a my2000 v7 sti?
« Reply #3 on: January 01, 2017, 08:12:51 pm »
^---- says the guy with his v7 ecu reflashed by airboy.

Heh, I came back to be less of a jerk, but you beat me to it. Thanks GrantC!

I have a V7 EJ207 in my wagon that was tuned by Airboy, who is the man. Here is my thread if you want to scroll through: http://www.westernsubaruclub.com/smf/index.php?topic=32374.0 There is, I think, at least one pic of my ecu.

Offline GrantC

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Re: Tuning solution for a my2000 v7 sti?
« Reply #4 on: January 01, 2017, 08:13:14 pm »
Look up the MY and ecu sticker/code... If it's a v7 I'm sure it's supported.

Production year isn't the same as MY.

Offline JonF

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Re: Tuning solution for a my2000 v7 sti?
« Reply #5 on: January 01, 2017, 08:19:52 pm »
Look up the MY and edu code... If it's a v7 I'm sure it's supported.

Production year isn't the same as MY.

How does one differentiate between MY and production year?

Offline GrantC

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Re: Tuning solution for a my2000 v7 sti?
« Reply #6 on: January 01, 2017, 08:35:09 pm »
How does one differentiate between MY and production year?

Bugeye were JDM MY01-02 (aka. USDM MY 02-03).  Blobeye were JDM MY 03-04 (aka. USDM MY04-05).  Early productions of MY01 cars would have been made in the 2000 calendar year.  (MY00 cars are v6)

I'm suggesting that your V7 is either MY01 or MY02, and surely reflashable & there's just some confusion because it's the first year of the MY01 V7 STi.

If you want to make 100% sure you could peel back the carpet & look at the what it says on the case of the ECU, or just connect learning view or some other open source software & see what it says.

Offline JonF

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Re: Tuning solution for a my2000 v7 sti?
« Reply #7 on: January 01, 2017, 09:29:10 pm »
Alright I'll pull up the foot well and see what it says on the ecu. Thanks for the info!

Offline RockThePylon

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Re: Tuning solution for a my2000 v7 sti?
« Reply #8 on: January 02, 2017, 06:59:13 pm »
When you put a full exhaust on, the turbo spools easier. Boost control is actually pretty slow, so with the OEM values, it's real easy for it to overboost. The boost pressure may also oscillate, because it's over/under correcting. For it to be smooth and safe, you need to adjust the wastegate tuning. A "cheap-prick" option would be to put a $15 eBay manual boost controller on it and #yolo.

And no, the ECU can't adjust itself for much. Fuel/Air ratio at idle and low-load is about it, fuelling isn't (generally) adjusted at all for higher load/RPM.
Knock compensation only happens when something bad is happening, and it's trying to stop hurting itself. It's also trying to get the best performance, so it'll keep hurting itself a little bit all the time as it rides on the edge of knock.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.

Offline JonF

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Re: Tuning solution for a my2000 v7 sti?
« Reply #9 on: January 02, 2017, 07:32:32 pm »
Thanks for the informative post.  I was wondering if a manual boost controller would circumvent some of these issues.  Presumably there are some pretty good reasons that you should not do this?

Offline RockThePylon

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Re: Tuning solution for a my2000 v7 sti?
« Reply #10 on: January 02, 2017, 07:50:38 pm »
Presumably there are some pretty good reasons that you should not do this?

Any boost pressure under the MBC's set point will still be uncontrolled. So you may have full boost at part throttle, or it will oscillate as the ECU tries to hit targets.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.