hi iv got 98 reg subaru forester st/b think its same engine as imprezas.
thing is iv got tdo4l turbo on it ad its smoking really bad someone recommended me to replace it with tdo5
qestion is does tdo5 gonna bolt same as tdo4 with no extra mods
and do i gonna see any changes in power without remap ?
Thanks

 

Swapped my td04 to a td05 on my 1995 impreza wrx wagon. It was a direct fit thank goodness. You will need a remap for sure: turbo bigger so will force more air into the manifold which needs to be matched by extra fuel. Wastegate duty cycle will also inevitably be different. I swapped the ECU in my car as difficult to remap the earlier models.

 

ok i see now what im dealing with what could be a rough remap price ?

 

Never had it done. I would guess £200-300. You could PM Jolly Green Monster for a quote. Well worth doing IMHO.

 

other option would be to buy another td04 and bolt it on: cheap as chips and no remap needed i would say since it's the same.

I have one if interested. just came of my subaru (changed to a vf28 this week). you will also need new gaskets for it. apart from that doesn't smoke or leak oil. has a bit of play in the shaft but nothing serious. about the same as my vf28.