stock turbo

[Bohman731]

hey guys i picked up a stock turbo from a 2005 baja. i am putting a turbo on my car (its not a subie by the way) at the moment and i need to know what kind of turbo it is so i can get a flange for it. is it like a t3/t4 or like a t-25 or what. Thanks for any info

[bulwnkl]

It's a Mitsubishi TD-04. Most people assume it is the same as the one on a 2-liter WRX. The assembly number is the same for the turbine section, but different for the compressor section. Therefore, there is reason to believe that the WRX compressor map is not the correct one for the Baja turbo. That is also sensible since the WRX 2-liter would need different a different compressor performance curve than the Baja's 2.5-liter.

However, you'll find that there are no American suppliers who are able to determine what the Baja's compressor assembly number is. IOW, you can't get a compressor map for it to try to figure out what you have. You also can't get the right (the same) rebuild kit for a Baja turbo. You either buy it from Subaru or get a WRX compressor or go aftermarket. I've also tried a couple of overseas sources to help me find a compressor map, and have gotten nowhere.

Good luck!

[Bohman731]

well this turbo is going in my non turbo eclipse but it needs a rebuild so what should my options be

[bulwnkl]

Well, you can't get a compressor map for the Baja turbo, so you don't know what the 'performance curve' of the turbo you have is. If you don't know what the turbo will do, IMO it is foolish to use it as an add-on to a non-turbo engine. Plus, you won't be able to get a rebuild kit for it that you can know for sure is the Baja's compressor. It'll probably be the WRX compressor you'll get. That may actually help you since you'll be able to get a map for it and know what it'll do for you.

I encourage you to try to get your turbo rebuilt and see what the rebuilders will tell you about the different assembly numbers between Baja and other TD04 turbo compressors. If you can get any info, I know I'd sure appreciate you sharing it here. Good luck!

[twheats1]

Interesting about the compressers being different between the Baja's and the WRX's. Enclosed is a link to an Austrailian Subaru tech document for the 04 Forester XT, (which should be the same engine as the Baja) It shows the compressor size and number of blades as the same as an 03 WRX.

http://www.subaruforester.org/vbulletin ... iption.pdf

[Bohman731]

well i have been doing a little research and its looking like this isnt gonna be a good turbo for me. so if anyone wants it ill sell it for pretty cheap
You can email me at gran_tfan@yahoo.com

[bulwnkl]

Interesting about the compressers being different between the Baja's and the WRX's. Enclosed is a link to an Austrailian Subaru tech document for the 04 Forester XT, (which should be the same engine as the Baja) It shows the compressor size and number of blades as the same as an 03 WRX.

http://www.subaruforester.org/vbulletin ... iption.pdf

I can't see the document since I'm not a member there. I'm certain that you (and they) are correct that it's the same size as the WRX. After all, it is a TD-04. Same number of blades also makes sense. The difference would/could be in the trim (aka exact shape of the compressor blades). As odd as it may seem, the trim can make a significant difference in performance characteristics. Just thinking about it, one can see that a 2-liter engine putting out ~220hp needs different performance characteristics than a 2.5-liter putting out 210. The 2-liter will need higher pressure ratios at a given throughput/volume than the 2.5 would need. That's not to say that the one couldn't work in the other application, just that it's not the turbo you need to do the job properly.

[twheats1]

Here is a copy of the tech. doc. regarding the turbo. (Sorry about the formatting)


Turbocharger
The turbocharger used in the Forester XT is the same physical size and
specification as the Impreza WRX model year 2003 however because
the Forester has a larger 2.5-litre engine the turbocharger capacity to
engine capacity ratio is smaller. The maximum boost pressure is lower
at 600 mmHg (11.6psi) compared to 700 mmHg (13.5psi) in Impreza

04MY 03MY
Forester WRX
A/R 13 13
Turbine Blade diameter intake/outlet 45.6/52 mm 45.6/52 mm
Number of blades 12 12
Compressor Blade diameter intake/outlet 56/40.6 mm 56/40.6 mm
Number of blades 6+6 6+6
Waste gate Waste gate port diameter 27 mm 27 mm
Waste gate set load 45.3 kPa/1 mm 64.7 kPa/1 mm
56.0 kPa/6 mm 84.7 kPa/6 mm
Maximum turbo charge pressure 600 mmHg 750 mmHg

[bulwnkl]

Thanks for posting that, twheats1.

I surely wish someone could decode the Baja's assembly number. The mitsubishi assembly numbers directly indicate what compressor and turbine section (including trims) are. The Baja's turbine number is the same as the WRX number. The compressor number isn't. Wish someone could get Mitsubishi to send a decode sheet and a map. Maybe (with luck) the diff is too small to notice until you're on the edge of the performance envelope?