TD04 turbo

[sb2752]

hey this may sound like a stupid question, but i would like to know if all TD04 turbos are the same?? like will any old TD04 bolt up to an wrx dump pipe and manifold or do they change for diffrent modle cars??
cheers jarrod

[AndrewT]

there are slight differences. as to the specifics I cannot tell you but a mate of mine with an MY99 WRX changed his TD04 for one from a much later model WRX and had to get his exhaust repositioned to stop it hitting the car afterwards as the turbo outlet was in a slightly different position.

[Gannon]

The TF035, TD04 and TD05 all have the same exhaust flanges. So do variuos VF series turbos.

Some earlier TD04 and TD05s have an elbow on the compressor inlet, but later ones have a straight inlet.

[sb2752]

hmmm ic so dose that elbow matter. and the td04 should bolt up to an ea82t manifold?? thanks for ur help guys

[Gannon]

so dose that elbow matter?

The elbow matters if you try to put it on a new subaru that has the intake "under the manifold"

and the td04 should bolt up to an ea82t manifold??

No the TD04 will NOT just bolt up the EA82T exhaust manifold. The manifold will need to be modified first.

This is a good example of how to extend the rear bolt hole to fit a TD04

[discopotato03]

Don't know how specific you want to be but overall it works like this .

Most turbo manufacturers make units and classify them primarily by their exhaust turbine type , Garrett and Mitsubishi (MHI) both work it this way .

MHI TD04 series : There are four turbine wheel sizes in the TD04 group and smallest to largest are
1) TD04
2) TD04L
3) TD04H
4)TD04HL

Those used on EJ20 turbo engines mostly have the 2nd smallest (TD04L) turbine but a couple of less common ones use the largest TD04HL turbine .

The specific compressor used in a TD04 type turbocharger is the middle part of its description ie the "13T" part of say a Rex's TD04L-"13T"-6 tells you that its compressor is 56mm major diameter and 40.64mm on its inducer or inlet diameter .
You'll sometimes see MHI turbos with compressor wheels that have their blades or vanes all at the same height when you look into the wheels snout . These wheels have a prefix like B or C ie 9B or 11B or 13C where the wheels that have 6 high and six low blades have a G or T prefix like 12T or 13G or 13T etc .
The three that I know Subaru have used are the 13T (most common ADM/USDM Rex TD04L-13T/6) the 15T (rare one in the TD04HL-15T/6 from the JDM EJ205DW powered Rex wagons) and the 19T (not as rare in the TD04HLA-19T) which is a twin scroll turbo possibly from the JDM Legacy GT .

The usual Rex TD04L-13T/6 is common and cheap for what they are so that's in their favour for an alternative on an EA82T engine .

I have searched cyberspace high and low looking for that rare TD04HL-15T/6 but anyone who knows anything has clammed up for some weird reason .
Because the EA82T I've had built will run 8.6 (up from 7.7 CR) and ported heads I want the larger HL turbine which you can get and rebuild a basic Rex TD04 around it .
In case anyones curious the "/6" I've tacked onto the end of some of those turbo part no's means the turbine or exhaust housing is 6cm , Mitsubishi rates the size or what Garrett would call area radius ratio (A/R) purely on the A or area of the housings inlet passage .
What that HL sized turbine achieves in the same 6cm sized housing is less restriction to gass flow which means more torque everywhere and less reduction in maxinum boost at the top of the engines rev range . The smallish housing size stops them being laggy and the larger turbine diameter lets it flow better than the L turbine does .
Insitu the HL version is virtually impossible to differentiate from the L version unless you know and can see a few part numbers - great sleeper and possibly great evener over a standard early Rex in small turbo form ...

Look at the time , cheers A .