40 replies to this topic

[jordyturnbull]

After realising I probably can't get away with a turbo conversion on my gen 3, and seriously can't stand the lack of power in the Na ej25 I've decided to look into a h6 conversion.
I know a ez30 goes for around 1-2k but that's without a box and loom and ecu. My questions are about gearbox options, I doubt the stock gen 3 5 speed can Handel the extra tourque? but what about a Sti 5 speed or a late model wrx 5 speed ? Ideally I want a 6 speed but everyone separates them and sells them for twice the price of the engine they came off.

Anyone done something similar ?
maybe an imported b4 3.0 front cut and spend a weekend bolting everything in ?
any insight would be appreciated

[El_Freddo]

If you do t abuse the box it'll be find behind te H6. A mate of mine ran a dual range 5 speed behind a H6 without issues.

It's the same as running an EJ turbo in front of a dual range - no clutch dumps or harsh gear changes and the box will be fine.

If you can get an STi box it should be fine too. When you open these things up they're all pretty much the same other than the dual range setup, drive and final ratios...

Cheers

Bennie

[jordyturnbull]

Do you know what he did for the loom and ecu ?
An outback h6 ecu and loom with manual mods ?

[Barbbachello]

Only ECU apart from an aftermarket one that will run a H6 is a H6 ecu. Assuming you want a gen 3 EZ30 youll need a gen 3 EZ30 ECU. These came auto only and will spit the dummy albeit work behind a manual.

Easiest option would be to get a gen 3 H6 outback and convert it to manual. Second option would be to be a halfcut as you said but it will take a lot longer than a weekend. At a minimum youll need the engine, radiator, power steering lines and pump, H6 or at least upgraded brakes, the loom, ECU, key barrel, keys, immobiliser module, cluster, intake and probably other stuff i cant think off off the top of my head. Theres a reason people say get a halfcut. Youll kill yourself with little bits and pieces if you don't.

The keys, barrel and immobiliser can be avoided by using a jap ECU and loom or moving some wires around on the AUDM H6 loom

As with any conversion

• Things will go wrong
• It will be expensive
• If it needs to be done in a certain amount of time, it wont be done
• Stuff will break
• You wont know how to do parts of it and will need help

Im not saying dont do it, but think carefully about it. Are you comfortable pulling everything out of your car and putting it back in in a safe and working manor? If yes; go for it. If not; buy factory H6 and go from there

[Jimbo]

Instead if blowing cash on a conversion, save a bit and just buy a Gen4 3.0R, so cheap nowdays.

[jordyturnbull]

the work isn't a problem. I'm changing to wrx 4/2pots as soon as I can find a set, with braided lines. so that ticks one thing off the list. I want a post facelift ecu as I'll be able to tune it.
im lead to believe everything is bolt in and I have the tools.
Say I go for the ez30 on my current driveline.
Can get a ez30 wreck/ cut without a box for less than 2k
That would probably include an ecu and loom, with bits like the radiator and power steering pump
Then I could send both my stock loom and the 3.0 loom to am auto and fork out 1k for the looms to be meshed together.
Then add an extra 1000 for shit I'll forget about or not think about
4000 isn't bad, and it's still cheaper than a 3.0r spec b

And yeah I'm not a fan of gen 4s.

[LPM_B4]

the work isn't a problem. I'm changing to wrx 4/2pots as soon as I can find a set, with braided lines. so that ticks one thing off the list. I want a post facelift ecu as I'll be able to tune it.
im lead to believe everything is bolt in and I have the tools.
Say I go for the ez30 on my current driveline.
Can get a ez30 wreck/ cut without a box for less than 2k
That would probably include an ecu and loom, with bits like the radiator and power steering pump
Then I could send both my stock loom and the 3.0 loom to am auto and fork out 1k for the looms to be meshed together.
Then add an extra 1000 for shit I'll forget about or not think about
4000 isn't bad, and it's still cheaper than a 3.0r spec b

And yeah I'm not a fan of gen 4s.

 

Gen 4 are canbus and a complete head fuck converting with.

 

There is a lot of work swapping in a EZ30 into a gen 3 have a read of Cams GT30 (EZ30D manual conversion) thread on here. That car was done meticulously and cost a fair penny to do properly.

As others have said think about it before jumping into it lots of time effort and money to do it properly. 

[duncanm]

I don't see the issue..

find a gen3 outback wreck for a donor (or use that, delift it and put a manual gearbag in it).

Get the ECU tuned and remove the AT error codes at the same time.

 

Wasn't Cam's complicated because it was a newer three-port EZ30 ?

[jordyturnbull]

Can you even tune the outback ecu ? it was to my belief that you could only tune the post facelift 3.0r spec b ecus? i want to run flex fuel so that adds a complication.

and i've considered an outboat but i love the sedans. 

pretty much want an rs30, but i want to do it on the cheap, if ichiban could offer a 3k rs30 half cut like i saw up for sale last year i'd be all over it...

[Bumpty]

I'm changing to wrx 4/2pots as soon as I can find a set, with braided lines. so that ticks one thing off the list.
 

They're the least of you're worries ...Because I have a set.

[Barbbachello]

Can you even tune the outback ecu ? it was to my belief that you could only tune the post facelift 3.0r spec b ecus? i want to run flex fuel so that adds a complication.

and i've considered an outboat but i love the sedans. 

pretty much want an rs30, but i want to do it on the cheap, if ichiban could offer a 3k rs30 half cut like i saw up for sale last year i'd be all over it...

You can tune the Rev D-E JDM ecus. Wont be able to do flex fuel with one though. Youll need an aftermarket ECU for that which to some extent would make things easier but add a lot of cost

[El_Freddo]

With the auto box removed Al will have a fix that tells the ECU that the auto is still there and happy so the ECu does it's thing properly.

Another mate has the H6 in a forester running an aftermarket ECU with the individual exhaust port H6 with a dual range box behind it.

Another gen III outback (unfortunately no longer) had the manual swap, this is the one that Al did the auto box signal patch/fix on.

The one I was talking about originally was my Kate's GenII wagon that he just sold. It was Al's first H6 conversion I believe and this vehicle was the shopping trolley so to speak.

It's doable. Half cut would be best.

Cheers

Bennie

[Cam.]

My car was a 30D. Conversion and cheap shouldn't be in the same sentence. 

http://www.subyclub....9527-cams-gt30/

That car owed me a mint but it was done perfectly, tuned and had a functioning engine light.

[jordyturnbull]

Why not ? Surely cheaper than an Sti conversion.
Had a quick flick through you thread, serioisly the nicest gen 3 I've seen.
Why couldn't gen 4 shit be used ?
Gen 4 manual ecu and all the running gear?
Surely that wouldn't have the same problems as using a jdm auto ecu

[Staxta]

Can use a gen 4 as a donor, just more work and more costs involved.

[CRUISN]

Buy a Gen3 H6 Outback. Saves so much hassles and everyone knows sedans are g a y as fuck.

[andrew_k]

Start with an H6 + bajillionty

[Barbbachello]

Why not ? Surely cheaper than an Sti conversion.
Had a quick flick through you thread, serioisly the nicest gen 3 I've seen.
Why couldn't gen 4 shit be used ?
Gen 4 manual ecu and all the running gear?
Surely that wouldn't have the same problems as using a jdm auto ecu

Depends which STi. It would be the same price as a GC8 STi swap. 

Gen 4s are quite technically advanced compared to gen 3 and earlier stuff. A lot more emissions and security features on them. 

As cam said; Cheap and conversion dont belong in the same sentence unless you do all the work and get lucky with your donor

 

Cheap, reliable, fast; pick 2

We are not saying dont do it. We're just saying think carefully as its not just bolt it in and plug stuff in. 

[duncanm]

Why not ? Surely cheaper than an Sti conversion.
Had a quick flick through you thread, serioisly the nicest gen 3 I've seen.
Why couldn't gen 4 shit be used ?
Gen 4 manual ecu and all the running gear?
Surely that wouldn't have the same problems as using a jdm auto ecu

 

gen4 is CANBUS, right?  ECU will want to talk with everything.  It then becomes alot more complicated than just an engine swap unless you go aftermarket ECU.

 

Easiest, most straightforward solution (if you want a sedan) is to find a local H6 outback wreck and use it as a donor.

[Barbbachello]

 

gen4 is CANBUS, right?  ECU will want to talk with everything.  It then becomes alot more complicated than just an engine swap unless you go aftermarket ECU.

Facelift is canbus, pre is still OBD or whatever but its still a complicated setup