OK, someone has to know... The standard turbo on my '93 JDM WRX is a TD05, but which one? 16G, 18G, 20G... and more importantly, how do I tell??

 

it will be a 16g

 

^ what he said. For reference if you have an 18G there should be a lot of supporting mods to match and the car will be seriously fast. If you have a 20G, then the car will have even more supporting mods and it will be F*****g rapid

 

thanks for your input rossyboy but I was looking for a definative technical answer.. there HAS to be a way to tell

 

I'm pretty sure that scoobboy is right... it is most likely a 16g, but I'd like to know how to tell

 

 

The technical answer is - by looking at it. All standard fit turbos on early classics had a 90 degree entry TD05-16G, simple as that. It will have a number cast into the bottom left corner of the compressor cover, something like - 14412AA092 49178-06310 TD05H and then a serial number. This is the standard Subaru application of the TD05H with a '16G' size compressor side. The 18G has a larger compressor cover and wheel with no codes cast into it, the 20G has an even larger wheel and cover (the cover is a TD06 one IIRC, although I may be wrong about that).

All TD05-16Gs designed for Subarus are 90 degree entry to start off. Some are still like that, some have had their compressor covers machined to remove the snorkel and convert them to front entry. 18G and 20G variants, which have NEVER been standard on any Subaru, are always front entry turbos.

 

Thanks for that silent running. That is the best explaination I have had to date.. even so called 'specialists' have merely shrugged their shoulders at the question

 

edited cos I cant read

 

LOL no problem. I had to figure it all out for myself cos I had trouble getting all the info together in one place so I could understand it. No point keeping it to myself! A good place to start off is Andy F's website where you can see a few of the variants, also on ebay there are (or were) a few about, mainly fakes from Taiwan, but they look like what they should look like. All genuine TD05's are made by Mitsubishi/MHI