Biggest compressor housing for turbos

[BR1JZL]

before everyone goes on about "use search", it's been covered x amount times etc, I just want to know the biggest compressor housing that can be fitted up with the stock manifolds (I know the td04 -13t off the Subaru are used because of the flange), without clearance issues, such as oil filter, and engine mount and fans. eg would a td04-19t fit if the flange was the same, etc.

 

[trotty]

The tdo4 doesn't really fit without clearance issues. The oil filter needs to be relocated no real room for dump pipes the physical size of the 13t and 19t are the same. It's just internals that change.

 

[BR1JZL]

oh ok, thanks Daniel. how does the car feel with td04-13t's? like when do you start to get boost and when does it plateau?

 

[trotty]

oh ok, thanks Daniel. how does the car feel with td04-13t's? like when do you start to get boost and when does it plateau?

No idea. I haven't finished my kit yet. But I've been told it's about 1000rpm later. So nothing to bad.

 

[Smanning2469]

so all you've done is change the compressor housing on the stock 6ATT TD03's?
ive been looking at such a upgrade but couldn't find someone who has actually done it yet.

 

[trotty]

No u have to get custom manifolds or weld the tdo4 exhaust housing to the manifold/modify manifold to suit the bigger turbo. There are no "bolt" in upgrades for the 6a13

 

[murat]

If i was to upgrade to tdo4 or kkr280 do i need aftermarket computer or or will the factory ecu adapt with the turbos

 

[whats_doing]

If i was to upgrade to tdo4 or kkr280 do i need aftermarket computer or or will the factory ecu adapt with the turbos

It wont "adapt". You will require a retune as the map needed will be completely different. However no matter what stock ecu you have, they are all flashavle now. No need to go aftermarket.

 

[murat]

Ok now if i where to mount these turbos on will it use more fuel than factory just say most of The driving is crusing mode thats with the flash tune or aftermarket ecu

 

[murat]

Ohh also what happens if you leave the rear stock td03 turbo and upgrade the front will you get the best of both worlds
Rear will spool early
Front spool late

 

[whats_doing]

Ok now if i where to mount these turbos on will it use more fuel than factory just say most of The driving is crusing mode thats with the flash tune or aftermarket ecu

Uhhhhhh what?

Ohh also what happens if you leave the rear stock td03 turbo and upgrade the front will you get the best of both worlds
Rear will spool early
Front spool late

Nope. Rear turbo will push air out the front turbo. Unfortunately that isn't how sequential turbos work mate.

 

[smohekey]

These aren't sequential, they're parallel.

 

[pretzil]

My dream build is a sequential "meat and 2 veg" set up. Stock turbos, with wastegates going to a bigger 3rd turbo.

 

[trotty]

My dream build is a sequential "meat and 2 veg" set up. Stock turbos, with wastegates going to a bigger 3rd turbo.

Hmmmm would be ideal aye. Best of both worlds.

 

[smohekey]

That'd be called compound. Sequential is like the subaru setup on their Legacy's, where one turbo is not getting any exhaust for the lower rpm band.

 

[pretzil]

What happens on their small one when the big one comes on though? I thought compound just where one receives boost from the first one, increasing pressure more. On these cars you would still be limited by td03 airflow

 

[TME_Steve]

Use the big new one to push into the little td03s

 

[wintertidenz]

Compound has the big turbo before the smaller ones, but the exhaust gases go to the smaller one first then the larger turbo.

Once the smaller turbos have spooled and the wastegates open, then the larger turbo spools.
The larger turbo will compress air and that'll go through the pipework to the smaller turbos, which then compress again (they don't care if the air is already compressed, they will compress it again) hence you end up with a LOT more pressure.
If the TD03s as an example were compressing 10psi and the larger turbo was doing 18 or so, then you would see maybe 24psi into the engine (have to account for losses).

 

[pretzil]

Is that what the legacy has?

 

[wintertidenz]

The Legacies have a sequential setup - only one turbo is active at a time. It's got all sorts of piping and stuff to divert exhaust flow from one turbo to another.