Gen 4 engine in BH?

[McMatty]

Hey all I'm relatively new to the Subaru scene as I've just bought a BH legacy and I was wondering, will a turbo engine from a gen 4 legacy be a good swap to do in my car, will i just need to swap engine loom and ECU? what will I need to do to make it work? and will it need a cert? Etc

All help appreciated

[Joker]

ooh well out of my tech experience there but yea thats the hard way tor repower a BH I'd say

whats wrong with your car?

and what revision is your Car (Check the Applied code on the ID Tag near the passenger side strut tower under the bonnet) the letters BH5* < where * is the important letter

[McMatty]

Just the Km's are getting a bit too high for my liking and just wanting to put something in that i can get a bit more power out of, ive got a 99 BH5B, any suggestions on what i should do to repower my BH?

[SpeedySub]

I'd say easiest thing would be to get a rebuilt/reconditioned engine and drop in. Rev A - C use a different ECU and loom to Rev D and the Gen 4 engines. Leave all wiring in place and just bolt the new motor in.

[Joker]

V5/6 Single T conversion?

[McMatty]

How much do you estimate a single t conversion to be? i saw rossubs thread and that seemed pretty expensive

[Rosssub]

Only because of the way I went about it, parts used etc. Can be done very cheap and easy, especially if you use your original engine.

Single turbo exhaust manifold/uppipe - $50-$100

VF single scroll turbo - $150-$300

V5/6 WRX A7/A8 ECU - $50-$75

Y-pipe for TT TMIC - $50

Make new DP to suit, or:

Single turbo GB crossmember - $50

Single scroll DP - $50-$100

Or add $1000-$1500 and fit a complete second hand version 5/6 STI engine and a J2 ECU ($125-$150).

Or a new V7 STI shortblock, V5/6 STI heads, J2 ECU.

[McMatty]

Cheers Rosssub, what kinda power are you pushing out after the conversion?

[Rosssub]

Made 160atw with a cheap MBC. Post #74 in here:

http://clubsub.org.nz/forum/showthread.php?40590-Rosssub-s-GTB/page8

[Joker]

aka OEM / Standard power then? Same as a OEM Standard TT would / should / does

[GorGasmSpecB]

Yep my TT is pushing the 200kw mark with all bolt ons and tune. Sure it's 205kms old, but it has shown no signs of giving up yet.

I would only convert if the engine ****s itself and even then I might just rebuild the TT or ditch the car and buy something else.

Would the gen 4 motor using the factory ECU also need the dash, key cluster to actually work?

[A_J_T]

How many Ks has this car actually done? Strip down the engine you have. throw a set of rings at it and give it a brief once over and single turbo conversion it while you’re at it maybe? Mine is knocking on 200,000kms and runs nicely at 200wkw

[McMatty]

Sweet, I think I'll do a single T conversion then, any suggestions on which turbo to go for? And whether to go twin scroll or single scroll?

[McMatty]

Oh and my cars just hitting 215,000km

[Rosssub]

Twinscroll for the win, but it will come down to price and availability of parts. Here's a good thread covering the different VF turbos:

http://clubsub.org.nz/forum/showthread.php?43742-VF-Turbos-what-you-need-to-know-in-laymans-terms

[McMatty]

Cheers Rosssub, final thing is, does your car feel better to drive after you've single t'd it?

[Kiwi_Fozze]

What revision bh legacy?

Different revisions require a slightly different approach, if its revision d you can reflash the ecu around the mods...

Gen4 swaps are... Difficult, without going to stand alone ecu

[Rosssub]

 kwi_fozze']What revision bh legacy?

Different revisions require a slightly different approach, if its revision d you can reflash the ecu around the mods...

Gen4 swaps are... Difficult, without going to stand alone ecu

BH5B.

[quote name='McMatty said:

Cheers Rosssub, final thing is, does your car feel better to drive after you've single t'd it?

Definitely. Most noticeable for me in around town driving, passing and tight cornering. Even with a well sorted VOD and zerosports sequential controller the VOD could still catch me at the worst of times. Also has a lot more potential now with any aftermarket ECU fitted, plus:

Easier to work on, maintain and modify.

Less problematic, easier to diagnose.

More parts availiable, OEM and aftermarket.

Tidier engine bay.