I have ran a Holset HX52 and HX55. If you have a true HX50, it has a smaller compressor housing than the HX52/HX55 and you shouldnt have any fitment issues. With the bigger housings you need to have a 20mm spacer between the manifold and exhaust housing to clear the 1st runner. Also note that the "T4" flange in the Holsets is actually a H2 Holset flange which is similar to the T4, all you need to do is enlarge the bolt holes on the flange.

Use a divided manifold to take advantage of the twin scroll exhaust housing. For some reason I couldnt find any divided manifolds for the 2JZ-GTE on Ebay (only for 2JZ-GE). I got mine here: http://www.manifold.cc/english/product.aspx?id=53

Do you know which size compressor and exhaust wheels do you have and which exhaust housing A/R (cm^2)? The A/R is stamped in the mouth of the housing. It's usually anything between 16 to 22. I wouldnt go bigger than a 19. #16 will be usually perfect on the bigger ones, that's what I run. The larger 22's etc usually come with bigger Diesel engines and are not suitable on a gasoline engine.

Here's a list I saved once of the formula between cm^2 and A/R:
8 cm2 = 0.57 A/R
9 cm2 = 0.65 A/R
10 cm2 = 0.73 A/R
11 cm2 = 0.81 A/R
12 cm2 = 0.89 A/R
14 cm2 = 0.97 A/R
15 cm2 = 1.05 A/R
16 cm2 = 1.13 A/R
17 cm2 = 1.29 A/R
19 cm2 = 1.37 A/R

 

^ nice...info saved!

 

ill get all those details once it comes in the mail. but i am gonna be using a GE block as they are dirt cheap here. i think i found a divided one on ebay tho and thanks for the specs^ anything important i need to know about runnin a deisel turbo..?

 

anything important i need to know about runnin a deisel turbo..?

Diesel turbos are the same as gasoline turbos. It's myth that Diesel turbos will break if used in a gasoline engine. The only thing usually is different that the exhaust housing is bigger. Some are too big to be used on gasoline engines, so check that first.

 

Ya, there is no problems using a deisel turbo. I used a holset hx45 on my gtr for 3 years, made 564whp and can hit huge boost all day long plus they are dime a dozen and cheap to rebuild been journel bearing..