International Looking to do some upgrades on my 94 6a12tt vr4

[will/vr4]

I'm looking to do some upgrades on my 6a12tt so I was looking for any advice on making a bit more power
It's currently stock with td025s (blue tabs) but I wanted to find out what turbos are a straight swop without having to change the manifolds
I read somewhere that other guys have taken td04s from the subarus and fitted them on but I'm not too sure if that's accurate
As well as upgrading injectors to 550ccs from the stock 275s
Aftermarket ecu and loom
I just wanted to find out if there's anything I need to look for or change out completely before I try adding more power

 

[6A13TT TYPE S]

TME in Australia does hi flow TD03 turbos to suit the 6A13. Youd have to do your own research as to weather the TD03 housings and cores are able to be fitted to the 6A12 manifolds, oil/water lines and downpipes

Mambatek also do a TD03 upgrade but same thing as above. Its for the 6a13 not the 6a12. Also as far as im aware the coolant and oil lines on the mambatek turbos are different so you need to fuck around a bit there with custom lines and fittings even on a 6a13.

Any bosch ev14 short injector with a 3/4 length 14mm top adaptor will fit in a 6A13 and as far as i know the 6a12 uses the same injectors.

You've already decided from your other threead about going COP and a wire in ECU which in my opinion is the best way to approach that problem as the stock looms are all old and falling apart due to the age and heat of the engine bay.

Camshafts and valve springs is a good way to free up more power aswell. The stock cams are extremely tame in their profile, and the 6A12s are even tamer than a 6a13

Head studs are also a wise idea if your going the upgraded turbo route.

Depending on your budget a single turbo conversion would probably be the most effective way to make power especially if your ditching the stock wiring and ecu as that is the biggest barrier against fitting a single as the stock loom in in the way of where you need to run hot exhaust pipes

 

[will/vr4]

TME in Australia does hi flow TD03 turbos to suit the 6A13. Youd have to do your own research as to weather the TD03 housings and cores are able to be fitted to the 6A12 manifolds, oil/water lines and downpipes

Mambatek also do a TD03 upgrade but same thing as above. Its for the 6a13 not the 6a12. Also as far as im aware the coolant and oil lines on the mambatek turbos are different so you need to fuck around a bit there with custom lines and fittings even on a 6a13.

Any bosch ev14 short injector with a 3/4 length 14mm top adaptor will fit in a 6A13 and as far as i know the 6a12 uses the same injectors.

You've already decided from your other threead about going COP and a wire in ECU which in my opinion is the best way to approach that problem as the stock looms are all old and falling apart due to the age and heat of the engine bay.

Camshafts and valve springs is a good way to free up more power aswell. The stock cams are extremely tame in their profile, and the 6A12s are even tamer than a 6a13

Head studs are also a wise idea if your going the upgraded turbo route.

Depending on your budget a single turbo conversion would probably be the most effective way to make power especially if your ditching the stock wiring and ecu as that is the biggest barrier against fitting a single as the stock loom in in the way of where you need to run hot exhaust pipes

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View attachment 66396

Those fuel rails are looking super good as well as the upgraded turbo
As for cams and head bolts i was thinking of doing all that when I blow my motor up which I know I definitely will because I'm going to keep running upping power on my stock internals but luckily I have a 6a13tt in pieces which I'm trying to built on the side to hopefully swop in sometime next year
I was hoping to just do some upgrades on my current 6a12 for now until the times comes where my pistom decides it wants to work for Elon musk and go into orbit

As for the single turbo setup I've thought about it and it would be a nice plan but at the same time I figured having two decent sized turbos might equal the same gains as going single just without the hassle of doing all the exhaust piping and all that other stuff especially since I'm based in Zimbabwe,Africa(yes we do have nice cars here too haha)

 

[6A13TT TYPE S]

The problem with twin turbo is space. There is more pipe works and more fabrication involved doing big twins than there is doing a single

 

[will/vr4]

The problem with twin turbo is space. There is more pipe works and more fabrication involved doing big twins than there is doing a singyea

TME in Australia does hi flow TD03 turbos to suit the 6A13. Youd have to do your own research as to weather the TD03 housings and cores are able to be fitted to the 6A12 manifolds, oil/water lines and downpipes

Mambatek also do a TD03 upgrade but same thing as above. Its for the 6a13 not the 6a12. Also as far as im aware the coolant and oil lines on the mambatek turbos are different so you need to fuck around a bit there with custom lines and fittings even on a 6a13.

Any bosch ev14 short injector with a 3/4 length 14mm top adaptor will fit in a 6A13 and as far as i know the 6a12 uses the same injectors.

You've already decided from your other threead about going COP and a wire in ECU which in my opinion is the best way to approach that problem as the stock looms are all old and falling apart due to the age and heat of the engine bay.

Camshafts and valve springs is a good way to free up more power aswell. The stock cams are extremely tame in their profile, and the 6A12s are even tamer than a 6a13

Head studs are also a wise idea if your going the upgraded turbo route.

Depending on your budget a single turbo conversion would probably be the most effective way to make power especially if your ditching the stock wiring and ecu as that is the biggest barrier against fitting a single as the stock loom in in the way of where you need to run hot exhaust pipes

View attachment 66395

View attachment 66396

The problem with twin turbo is space. There is more pipe works and more fabrication involved doing big twins than there is doing a single

Very true.....guess I'll just have to see once I take this engine out

 

[Demonrox122]

Personally I haven't got to play with my vr4 much, but I'd recommend a single turbo setup with the research I have been doing. Modern turbos are blowing twin turbos out of the water and space is a big factor. I initially wanted to keep twins because of the cool factor but with an ecu single is just easier in the end. Cant wait to see the progress

 

[will/vr4]

Personally I haven't got to play with my vr4 much, but I'd recommend a single turbo setup with the research I have been doing. Modern turbos are blowing twin turbos out of the water and space is a big factor. I initially wanted to keep twins because of the cool factor but with an ecu single is just easier in the end. Cant wait to see the progress

Haha yeah everyone keeps saying single turbo is the way and honestly you're all right 100% I think definitely that is the correct move
As for progress well it's not much at the moment