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The mkiv Supra Owners Club

Top Secret - V12 Supra? (56k stay away)


michael

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A little translated from Supraforums:

 

 

The 1ZE-GE engine came out of a Toyota century, which is the only V12 engine made by a Japanese auto manufacturer. Smokey Nagata had this idea for a while however the engine could not be sourced until recently. The 1ZE V12 configuration is best described as that of two 2.5 liter sraight 6 cylinder 1JZ setups paired up running next to each other in harmony.

 

In stock forn, th V12 puts out 280ps & 49kg/m of torque.

"Although the oil pan and the engine mounts need to be fabricated, the swap seems relatively simple. I was worried about the fit but the engine fit pretty snug." claims smokey.

 

Further plans include twin GT turbines mounted on each side, and the target is 1000 horsepower. A Getrag 6 speed transmission with ORC triple plate clutch will be used. Just like the V35 GTR that Top Secret had mde in the past, the electronic fly by wire will be switched to a traditional cable system and 2 Fcon Vpro units will be installed.

 

The Supra is planned to be outfitted with Top Secret's prototype 2007 wide body kit which looks nothing like their previous GT300 series kit.

Smokey says "I've always had love for the Supras, and this V12 version is my image of the Supra of the future. I have built many Supras in the past, but this version will be the last evolution. The completion will be just in time for the Tokyo Auto Salon."

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Mmmm looks good. Wonder what the stock engine can take power wise - 280ps standard is pretty low for 5 litres. Would be good to do a build like that not for ultimate power but for ultimate response / driveability with a Garrett GT28RS on each side to produce around 600bhp with a real quick spool up time.

 

Cheers,

 

Brian.

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Theres been a lot of talk over the years regarding the 1GZ-FE especially around a 1GZ-FTE conversion. Engine dimensions seem perfect for most transplants as its a very short 60 degree block.

 

image

 

The Specs of this engine are also quite interesting

 

" The newly developed 5.0-liter V12 engine installed standard in the remodeled Century represents Toyota's latest advances in gasoline engine technology. Combined with other advanced powertrain components, the finely crafted BEAM S* 1GZ-FE's performance characteristics are ideally suited for Toyota's flag ship luxury vehicle, providing smooth power across the rpm band while boasti ng impressive fuel economy.

 

Characteristics

Shortening of the interval between combustion cycles in each cylinder minimizes torque variation. Combined with the slant-squish combustion chambers, iridium electrode spark plugs, and Variable Valve Timing-intelligent (VVT-i), this stabilizes combustion and enables smooth engine operation like that fo und in electric motors.

 

Increased rigidity of moving and structural components, such as pistons and the cylinder block, decreases vibration by about 10% over the Celsior's (Lexus LS400) 4.0-liter V8 engine (1UZ-FE), which itself is renowned for its quietness.

 

Working in tandem with the VVT-i, a variable intake system alternates between two set intake levels, providing excellent torque in the low- to mid-range, which is most common during daily driving.

 

Compact combustion chambers provide a high compression ratio (10 · 5:1). VVT-I reduces intake loss, while titanium coated shims and a newly developed, low viscosity engine oil minimize friction loss. Along with the engine's ability to stabilize combustion when under a light load and to operate at very low rpms while idling, these increase the new Century's fuel efficiency by 13% over the previous model to 7.2 km/liter (10 · 15 mode).

 

*Breakthrough Engine with Advanced Mechanism System

 

Machining of engine components and engine assembly are performed by skilled technicians on production lines dedicated to the 1GZ-FE, while specialists carefully conduct final engine inspection using stethoscopes. Feedback from intensive durability testing of individual components was vital to the R&D p rocess. The fail-safe system, in which the two six-cylinder banks each have fully dedicated operating systems, further guarantees the dependability of this marvelous system.

 

Technologies

Slant-Squish Combustion Chambers

The squish area (the small niche formed between the piston and the cylinder head) is aligned with the wall of the combustion chamber so that the flame can quickly spread to the edge of the combustion chamber, improving combustion efficiency. Also, the openings around the intake valves have been widened, providing for greater amounts of air to be taken in and raising torque.

 

Mass Production of Iridium Electrode Spark Plugs a World First

Iridium increases the longevity of the center electrode, allowing for a smaller electrode diameter (0.7mm) and better ignition, thus stabilizing combustion.

 

VVT-I

Continuously controlling valve timing to best suit driving conditions increases torque, output, and fuel efficiency, while also reducing NOX and HC emissions.

 

Titanium-Coated Shims

The valve lifter shim surface that contacts the cams is mirror-finished and then hardened significantly with a titanium nitride coating. Moreover, the coating's microscopic protrusions further polish the surfaces of the cams that they come into contact with. This results in unsurpassed smoothness between all contact surfaces, reducing wear and rotational resistance with the camshaft.

 

Electronic Throttle Control System-intelligent (ETCS-i)

Computer signals electronically control the throttle valve in response to accelerator pedal movement. This control provides even torque even when the accelerator is pushed rapidly, smoothing the Century's progress.

 

Electronically Controlled Hydraulic Cooling Fan

In order to reduce engine cooling fan noise, the fan is controlled electroni cally to avoid its rotation rate from moving in stages and to operate it at the minimum speed necessary to cool the engine.

 

Cylinder Block and Oil Pan Rigidity

Toyota engineers used the latest computer technology to study the strength and rigidity of moving and structural parts, and sought the ideal engine layout through measurement and analysis of component movement, as well as their angles and positioning. The seam between the oil pan and the cylinder block, which is crucial for controlling vibration, is slightly bell-shaped. With in the cylinder block itself, internal parts are joined by bridge-type ribs, while the left and right sides are also connected, thus increasing bending and twisting rigidity, providing unsurpassed quietness.

 

Fail-Safe, Independently Controlled Cylinder Banks

Intake systems components such as air cleaners, electronic throttles, and surge tanks, as well the sensors and control units necessary to operate fuel injectors and ignition, are located independently in both the right and left six-cylinder banks. This fail-safe system is equivalent in ability to that of an airplane, allowing for the engine to continue operating even if the vital electronic control system of one cylinder bank should break down. "

 

 

Though quoted at 280ps, I think this power is dictated by insurance grouping or something in Japan. The big headache that seems to exist is replacing the engines 3 ECU's with a standalone system

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  • 2 weeks later...
I love it and all.

 

But why do the japs always fuck up the decals? If you spend this much time and money get two sets printed.

 

you mean because they are backwards?

 

it's so they read the right way when reflected in the mirrors in the pitlane isn't it?

 

i believe so :)

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Seen it today and sorry to say no pics but the damn thing is stunning.

 

Bodykit is probably not to all tastes but I love it. Love the lights as well.

 

Its all available to buy as well. The turbos are twin HKS 2540s, coupled with a V12 Id guess 700hp with amazing response. I didnt see Smokey today, but Ill see him tomorrow and will ask. Is very very well finished too. JGTC LED rear lights too.

 

Gaz.

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