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Old 06-09-2005, 09:54 AM   #1
Teh Legacy
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Default What's the deal with the B4 Engine?

I've heard so many different things about it, and I want to know FACTS. Can it, or can it not fit in our cars? I heard yes, but you have to custom fabricate the downpipe and a few other things. Does someone have a no BS answer that they're sure of?

/Jonathan
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Old 06-09-2005, 11:49 AM   #2
bhall
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From what I hear the biggest issue is going from RHD to LHD. I think for the price its easier to swap in a WRX motor that came from a LHD.

But I really have no idea what I am talking about so that may be all BS
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Old 06-09-2005, 12:02 PM   #3
Teh Legacy
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Actually, I've seen a number of B4 engines on eBay go for less than a grand (all parts included but the ECU.)

The real question is, why CAN'T it go from RHD to LHD???? People are swapping JDM STi engines into USDM Subaru's almost daily.
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Old 06-09-2005, 12:25 PM   #4
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it CAN go from RHD to LDH. The issue is with the placement of the second turbo and downpipe etc. This is conveiniently right where the USDM steering rack would be.

The swap is DO-able, but custom fabrication is required to move the second turbo out of the way of the steering stuff. If I recall correctly, there was actually pics on NASIOC someplace a year or so ago describing the issue exactly. Might wanna search.

Keep in mind that the ECU is very expensive too...even if you can find one.

Cheers,

fibuz
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Old 06-09-2005, 12:28 PM   #5
flanders
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Another problem is that you have no idea what the history of the engine is. These engines could be totally worked over.
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Old 06-09-2005, 12:42 PM   #6
gtwagon941
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Quote:
Originally Posted by flanders
Another problem is that you have no idea what the history of the engine is. These engines could be totally worked over.
This isn't a problem that is really specific to a B4. Any JDM engine, or even any engine that you don't know the of first hand could have been worked over.

fibuz hit it on the head. The second turbo is the main issue. And custom work like that is usually time consuming=expensive.

Jared
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Old 06-09-2005, 01:19 PM   #7
Teh Legacy
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The second turbo location was the issue I heard also. A very knowledgable friend told me it could be moved, but a custom up/down pipe would have to be made. I see this as something that would be well worth the extra couple hundred dollars for custom piping.

Would a LINK work as an ECU?
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Old 06-09-2005, 02:41 PM   #8
PHATsuby
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the link may work, depending on how the sequential turbo setup is controlled. it will control timing and fuel, but that doesnt help you if it cant control boost properly. I would assume its controlled mechanically, but i really dont know, you would need to talk to someone who lives in japan and owns one, anotherB4 is the only guy i can think of on here. also try scoobynet.

the sequential turbo set ups are not really worth it IMO, its a cool idea and cool to say you have, but true twin turbos would be better, or even a single turbo would be simpler and make more power.

if you really want twin, get a wrx motor and then fabricated your own setup either using internal or external wastegates to control both.

just my opinion though.

Ben
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Old 06-10-2005, 03:14 AM   #9
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LINK wouldn't control the switchover to the secondary very well.

The simple reason that twin turbo B4 motors are cheap on ebay is simply because they are not easy to bolt in. If they were, they would be in the same price range as the WRX or STi motors, or even more as they come with two turbo's instead of one.

When you tally up all the costs and time involved to get a twin turbo B4 motor to work in a swap project, you'd more than likely find it's cheaper, in the end, to use a WRX or STi motor for the project. Not to mention there is more documentation for the WRX/STi motor swaps, more parts, and more ECU solutions.

I've owned three twin turbo Legacies - I've got the single turbo'd twinscroll right now, and a single turbo is where you want to be anyways.

Cheers,

Paul Hansen
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Old 06-10-2005, 11:16 AM   #10
anotherB4
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Cool You called...

For big power, go single, the twin's only advantage is boost LOOOW down (like from 1800rpm ). It'll go like a scalded cat if tweaked right, but as Paul says, the WRX series motor swaps are easier to do and better documented.

Having to mod the piping for LHD on a twin is also a challenge, not to mention needing a bunch of stuff for boost control. If you can find a front clip with the harness, ECU and other bits intact (and want to go to the trouble of the piping surgery), then the TT is a goer IMHO (riding a torque monster around gets surprisingly addictive ).

Cheers
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Old 06-10-2005, 01:39 PM   #11
Teh Legacy
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Thanks for the info! With all the complications I'm starting to forsee, it looks like I'll go ahead and start looking for a Phase 1 EJ22 to build .
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