Hey all,

I just picked up two free sets of the MK4 Supra GTE turbos. I was planning on going single turbo but FREE ****.

Does any one have a good price to put on them? Or any good experiences using the OEM MK4's on the 2j GE?

Thanks,

 

Are they USDM/UK/EXPORT 2JZ-GTE twin turbo sets that use CT12B's or are they JDM 2JZ-GTE twin turbo sets that use the CT20's? And if JDM are they from a later model VVT-i engine or an earlier Non-VVT-i? And... how complete are these twin turbo systems in terms of all the parts. And as to condition of the turbos themselves, how many miles are on each? Any shaft play?

All of the above questions factor in to any pricing considerations. There are a handful of identical parts in both the USDM/EXPORT and JDM versions but there are also quite a number of parts in each variant that are incompatible with one another.

I run a fully reconditioned set of USDM stock twins in sequential mode in my SC with a 2JZ-GTE lower block... which is needed in order to hook up the stock turbo oil feeds. Any 2JZ-GTE cylinder head can be used with either version of the sequential twins and their matching exhaust manifolds. Turbo oil drains go to the same location on any JZ oil upper aluminum oil pan.

They really should be used with 2JZ-GTE short blocks rather than 2JZ-GE blocks. The turbo oil feed OEM metal lines bolt right up to GTE blocks whereas with 2JZ-GE blocks the feed has to come from the intake side followed by an aftermarket oil line splitter (Earls or other brand).

And they do probably require a 2JZ-GTE factory oil pump because of the extra oil pressure in the system to drive those and the two turbochargers rather than just one aftermarket single. The piston oil squirters on all GTE blocks are also supposed to use that extra oil pressure from their own slightly higher pressure OEM oil pump but it's also part of the system in order to provide adequate oil pressure for two little turbos instead of just one.

.....

In standard rebuilt form the USDM stock twins are good for just below or about 500whp... but with reduced lifespans at 18psi. Over 18psi they will wear out much faster. JDM stock twins, if they are the very early types with ceramic exhaust wheels really shouldn't be boosted over stock. JDM stock twins that came from 2JZ-GTE VVT-i engines have steel exhaust wheels and can be safely boosted higher than stock but I think their realistic limits are below 500whp.

There is a pricey but impressive upgrade for both the USDM and JDM versions of these stock twins both designed by Stuart Hagen which raise their potential much higher in the nominal 20+ psi range and max 27-28psi range for high boost runs. The USDM STU Hybrids get larger and more modern GT28 center cartridges and can go up to 700whp max. The JDM STU Hybrids get another more modern center cartridge and can do something close to that range.

Pricey for either STU Hybrid option but impressive potential IF someone absolutely wants to keep the stock twins on their engine.

....

If one of your systems is USDM spec I might be interested if all the parts are there in otherwise good working shape even if the main turbos are blown (which often tends to be the case after people run them hard at 18+ psi for several years). Often the #2 turbo is blown before the #1 turbo goes out due to the #2 pre-spooling function not working correctly if there is an issue with that part of the system that is left uncorrected for too long... especially at higher than stock boost levels.

From my own experience I really love the 2JZ-GTE sequential turbos in everyday all-around use but the best experience is one in which everything is reconditioned prior to installation and assembly.

 

Kahn!

You are a legend. After reading this it may be simpler to go single turbo in my case.

I will give them a closer look this weekend and I'll get back to this thread with some photos. Almost positive it's USDM spec. I actually have the factory oil pump as well.

Where are you located? I'm SoCal based.

 

Glad to help!

With a 2JZ-GE short block it will be much easier to go with a single turbo setup, yes. A single is FAR simpler to maintain and keep service parts for. But being in CA I'd go to the trouble of building a whole 2JZ-GTE engine with the stock USDM twins and USDM GTE head. You pretty much have to do that part by part these days as you collect all you need which is what I did with my SC.

For CA purposes it's also possible to *carefully* (very carefully) machine any JDM 2JZ-GTE Non-VVT-i cylinder head to accept the USDM/EXPORT GTE EGR hardware but definitely only have that done by a machinist who knows what they are doing. A set of USDM GTE cams and a good re-capped USDM GTE ECU would also be needed if someone were to go to that trouble.

All 2JZ-GTE engine blocks are the exactly same for any markets they were sold in which makes that aspect easy.

Any JZ short block (GE or GTE) can run an aftermarket single turbo setup. It's just much easier to run ANY version of the stock sequential twin system on a 2JZ-GTE block..... *unless* it's a set of USDM or JDM STU Hybrid Twins because those use aftermarket oil lines anyway.

....

I am currently located in central Florida. I was Los Angeles based for many years. I will be moving out there again but not just yet.

I can help you identify what you have in each sequential system set from your pictures.