"2JZ-GTTE" is something more along the lines of a ricer mentality, IMO. There's nothing signifying twin turbos (unlike Nissan's system), the T merely means turbocharged.
Aren't the two turbos differently sized?? A small one and a big one. Wouldn't that kind of kill the whole 'twin' thing. Kinda hard to have a true twin turbo setup on an inline motor.
Aren't the two turbos differently sized?? A small one and a big one. Wouldn't that kind of kill the whole 'twin' thing. Kinda hard to have a true twin turbo setup on an inline motor.
The 2JZ-GTE's twins are sequential, as far as I know. One better for lower revs cause of less lag for it to spool, and a bigger one for higher revs.
The earlier-model 1JZ-GTE had parallel twins, turbocharging seperately. Less lag as opposed to a larger single-snail, but less modding potential. Newer models had one bigger turbo and VVT-i.
edit: Bob (bgreiger) has a 7M TT manifold in his possession. And one of the admins I've met up with over at CelicaSupra.com actually has the 5M HKS TT manifold. So it's not necessarily hard, just usually (note I say usually) not the preferred setup.
The 2JZ-GTE's twins are sequential, as far as I know. One better for lower revs cause of less lag for it to spool, and a bigger one for higher revs.
The earlier-model 1JZ-GTE had parallel twins, turbocharging seperately. Less lag as opposed to a larger single-snail, but less modding potential. Newer models had one bigger turbo and VVT-i.
edit: Bob (bgreiger) has a 7M TT manifold in his possession. And one of the admins I've met up with over at CelicaSupra.com actually has the 5M HKS TT manifold. So it's not necessarily hard, just usually (note I say usually) not the preferred setup.
As far as I know of, even in the VVT-i's offered overseas had twin ceramic turbos (which were far less powerful than their steel brothers that were offered here in the states) and they never came with a larger single turbo, ever. I could be wrong, but I've never seen it.
Thanks to Wreckless for this info:
Quote:
The VVTi 1JZ-GTE's use a single turbo but are only found in the 97+ JZX100 Chasers & 97-00 JZZ30 2.5GT-T Soarers. There are no VVTi 1JZ-GTE's with a factory twin turbo configuration.
The VVTi 2JZ-GTE was still twin turbo but incorporated the same overall changes otherwise when it went VVTi. (MAF, wastespark, etc)
2JZ's always had twin turbos (and of course, N/A's) and 7M's had a single turbo (and the N/A as well). There was never a real (see: Factory) '7M-GZE' as somepictures around the web suggest. As for TT MA70's (Mk3 Supras), The only ones in existance were not offered stateside. The ones that were offered were either the 2.5L TT (1JZ-GTE) engine or the 2.0L TT (1G-GTE) motor not the 3.0L 7M-G(T)E motor we're all used to seeing.
(I'm just throwing all this out so that hopefully when the next noob wanders into the forum, they'll search and find this post. Obviously it's not all On Topic info.)
There are several TT manifolds in existance for the 7M, however due to the potential of a larger single, it's often the chosen power path. I know blitz made one, HKS made one, the 5M TT manifold which bgreiger has is from HKS IIRC... The authentic ones (not clones) are rare to find in most cases.
For future reference, this site has a lot of information about the import and export models of the Mk4 Supra: http://mkiv.supras.org.nz/specs.htm
As far as names are concerned, 2JZ-GTTE is really a nickname, the actual motor code is 2JZ-GTE regardless of how many turbos it has. Since the topic has arisen, here's a primer on Toyota Enginge Codes:
Toyota engine codes are split into two sections:
1. Before the dash - Which represents the family or series of the engine (i.e. 7M-GTE.) 2. After the dash - Which represents the engine features (i.e. 7M-GTE.)
#1 - Before the Dash:
The numbers represents a revision of the bottem end for example bore, stroke, and block.
A = A series engine, 4 cyl gasoline. Family of inline-4 configuration engiens with a displacement ranging from 1.3L to 1.8L. Series began in the late 1970s with the 1A, a SOHC with a displacement of 1.5L. In 1998, the 7A-FE was the last A engine in the family, a 1.8L DOHC engine that produced 115 HP.
AZ = AZ series engine, 4 cyl, gasoline. Family of straight-4 piston engines. Uses an aluminum engine block & aluminum DOHC cylinder heads. Has MFI FI and 4 valves per cylinder with VVT-i and features forged steel connecting rods.
C = C series engine, 4 cyl diesel.
G = G series engine, 6 cyl gasoline, family of straight-6 piston engines produced from 1979 through 1998. Only a single displacement, 2.0L was produced in this series. All were belt-driven OHC engines, with multivalve DOHC and even variable valve timing added later. These were used as a lower-displacement alternative to the more-common M family straight-6.
JZ = JZ series engine, 6 cyl gasoline, family of straight-6 engines.
K = K series engine, 4 cyl gasoline, pushrod. Family of straight-4 engine produced from 1966 through 1998. 2-valve pushrod design, a rarity for the company.
M = M series engine, 6 cyl gasoline, family of straight-6 engines used from the 1960s through the 1990s. All M-family engines were OHC designs with a chain-driven camshaft giving way to a belt after 1980. The 4M-E was notable in that it was the first Toyota engine to be equipped with fuel injection. The M family was commonly found on the large Toyota Crown, Celica Supra, and Supra.
MZ = MZ series engine, V6 piston driven, aluminum engine block and aluminum DOHC cylinder heads. The cylinders are lined with cast iron. It uses MFI fuel injection, has 4 valves per cylinder and features a one-piece cast camshaft and cast aluminum intake manifold.
NZ = NZ series engine, 4 cyl gasoline, family of straight-4 piston engines. The 1NZ uses aluminum blocks and DOHC cylinder heads. It also uses SFI FI, and has 4 valves per cylinder with VVT-i.
P = P series engine, 4 cyl gasoline, family of straight-4 engine produced from 1959 through 1979.
R = R series engine, 4 cyl gasoline. Family of straight-4 engines produced from 1953 through 1990. Designed for longitudinal use in such vehicles as the Celica and Cressida. OHC versions featured a chain-driven camshaft.
RZ = RZ series engine, 4 cyl gasoline, family of straight-4 engines usign a cast iron engine block & aluminum DOHC cylinder heads. Has MFI FI, 4 valves per cylinder and features forged steel connecting rods.
S = S series engine, 4 cyl gasoline.
T = T series engine, 4 cyl, gasoline, family of straight-4 engines. Began as an OHV design, but a chain-driven DOHC variant came later.
U = U series engine, series of flat-twin engines produced in the 1960s and 1970s.
UZ = UZ series engine, 8 cyl gasoline, V8.
VZ = VZ series engine, 6 cyl gasoline, V6.
ZZ = ZZ series engine, 4 cyl gasoline, family of straight-4 piston engines. The series uses an aluminum engine block and aluminum DOHC 4-valve cylinder heads.
Here is a different, more simpler, summation:
(All engines cast iron block, alloy head unless otherwise mentioned.)
A series (inline 4, belt, 1.3-1.6L, 1978-): Corolla FWD/RWD, MR2, Tercel FWD
AZ series (inline 4, aluminum block ?, chain, 2.0-2.4l, 2000-): RAV4, Previa
E series (inline 4, belt, 1.0-1.5L, 1985-): Corolla FWD, Tercel FWD, Paseo
F series (inline 6, 3.9-4.3L, cast iron head, 1948-1992)
FZ series (6 cylinders, 4.5L, 1993-)
G series (inline 6, belt, 2.0L, 1979-): Soarer, Celica Supra, Crown, Cressida, Altezza
GZ series (V12, 5.0l, 1997-)
JZ series (inline 6, belt, 3.0L, 1993-)
K series (inline 4, chain, 1.0-1.5L, 1966-1989+): Corolla RWD, Starlet RWD, Lite-ace
M series (inline 6, SOHC & DOHC (pre-80) chain, DOHC (82-) belt, 2.0-3.0L, 1965-1992): Crown, Celica Supra, Supra
* 1MZ-FE: M series engine, 6 cyl gasoline. Alum Block & Head (DOHC), Fuel Injected, Economy Twin Cam head (22º between I & E Valves), Belt Driven.
* 7M-GTE (Mk3): MZ series engine, inline 6 cylinder, DOHC, Belt Driven, Powerful Twin Cam Head(45º between I & E Valves), Turbocharged.
* 2JZ-GTE: JZ series engine, inline 6 cylinder, DOCH, Belt Driven, Powerful Twin Cam Head(45º between I & E Valves), Turbocharged.
Just a little typo there, we wouldn't want noobs to think that the MZ is the M and vice versa, thereby maybe creating the logic that Camry motor = Supra motor!
The "GTTE" thing with Toyota engine codes is a misnomer borne of the Nissan engine methodology, where a second T will be used in the engine code to denote a twin turbo setup, such as SR20DET (single turbo) vs a VG30DETT (twin turbo). The Nissan engine codes are very similar in some ways.
Furthermore, the sequential twins on the 2JZ-GTE are of identical size and its simply valving trickery that allows one to spool before the second. The nature of the valving trickery would not work as intended at all if two differently sized turbochargers were used, and this applies to all other sequential twin turbo setups in existance including the 13B-REW's.
This has been an ongoing engineering dilemma that I've never seen a functional solution to yet. Also, contrary to popular belief appropriately sized twins will make just as much power, but because of the added cost, piping complexity, and space issues, larger single turbos have much better output on the bang-to-buck ratio, particularly on cars that only came with a single to start, because of the additional fabrication required to make twins work.
This is why there were very few TT 7M's.
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