MK 3 Supra's

[Nuttah]

Anybody know anything about theese? iv just signed up to mkiiisupra.net but awating an admin to activate my account.

How much diffrence is there between the 3.0! single turbo and the 2.5 twin turbo models? are the reliable and are parts readly avalible if something goes wrong?

[Steameh]

As far as I know, the 2.5 has better tuning potential, and the 3.0 has a tendency to munch headgaskets.
I also have heard that the 2.5 twin turbo due to the setup can lead to overheating, which is why they switched the 1JZ-GTE to single turbo in later revisions.

Of course this could be all pub chat and I may be speaking trash.

[hairykrishna]

I've had a couple of the 3l turbos. The torque settings for the head bolts were wrong from the factory so they devoured their head gaskets. Get one that's had the gasket done and the bolts torqued properly and they're bulletproof. The manual box is an absolute joy to use, the auto's not as great but still ok. With a bit of tweaking they can be very, very fast and they handle pretty well into the bargain.

[Marf]

Steameh said:

I also have heard that the 2.5 twin turbo due to the setup can lead to overheating, which is why they switched the 1JZ-GTE to single turbo in later revisions.

Of course this could be all pub chat and I may be speaking trash.

Indeed. The 1JZ was always twin turbo, and the engine is hewn in granite and able to take massive punishment for a stock engine.

The 1JZ models are import only, Toyota only supplied the UK with the 3.0 single turbo complete with chocolate headgasket.

[LuS1fer]

Contemporary road tests between this and the Nissan 300ZX generally favoured the Supra but concluded both were boulevard cruisers.

[Steameh]

Marf said:

Steameh said:

I also have heard that the 2.5 twin turbo due to the setup can lead to overheating, which is why they switched the 1JZ-GTE to single turbo in later revisions.

Of course this could be all pub chat and I may be speaking trash.

Indeed. The 1JZ was always twin turbo, and the engine is hewn in granite and able to take massive punishment for a stock engine.

The 1JZ models are import only, Toyota only supplied the UK with the 3.0 single turbo complete with chocolate headgasket.

3rd Gen 1JZ's were definitely single turbo;

"The "third Generation" of 1JZs were introduced around 1996, still as a 2.5 turbo, but with Toyota's BEAMS architecture.[2] This included a reworked head, newly developed continuously variable valve timing mechanism (VVT-i) , modified water jackets for improved cylinder cooling and newly developed shims with a titanium nitride coating for reduced cam friction [3] . The turbo setup changed from parallel twin turbo (CT12x2) to a single turbo (CT 15B)"

Ripped from Wiki.


Edit to say that this engine is obv not in the mkiii supra, to which the op was refering, just trying to defend what little E-honour I have left

Edited by Steameh on Tuesday 28th September 16:07

[Marf]

I stand corrected

[Nuttah]

3.0L Turbo
turbo = ct26 x 1

power = 232hp @ 5600rpm, torque = 254ft lbs @ 3200rpm @ 5psi


2.5 Twin Turbo
turbos = ct12a x 2

power = 280hp @ 6200rpm, torque = 269ft lbs @ 4800rpm

Quite a hike in power from the twin turbo model which seem to sell for a little more than the 3.0 and appear rarer.

How easy would it be to bring the 3.0 up to around the same power and maby more?

I know 230bhp wont satify me as im running 250bhp in my 9-5 aero which is a simular weight and my sole purpose is to buy something that will destroy my saab with a little work.

Edited by Nuttah on Tuesday 28th September 16:17

[hairykrishna]

Nuttah said:

How easy would it be to brin the 3.0 up to around the same power and maby more?

I know 230bhp wone satify me as im running 250bhp in my 9-5 aero which is a simular weight and my sole purpose is to buy something that will destroy my saab with a little work.

Easy. Upping the boost a small amount is as easy as shimming the wastegate (adding a couple of washers). The standard exhaust and downpipe are really restrictive and swapping them gains you plenty of power. After that you start hitting the fuel cut off. The easiest, and cheapest, way to get around this is to fit the AFM from a Lexus soarer V8 which is a direct bolt on. Match this with some 550cc injectors, the exhaust upgrade and a boost controller will give getting on for 300 horsepower no problem. The engines really are indestructible, head gasket issue aside, I had a mate running one with over 600 hp on standard internals.

[J-Tuner]

The 3M-GTE is a decent engine other than the weak headgasket. Its easily fixed however with a decent head/block skim and a HKS metal headgasket installed properly. Gearbox is pretty solid, as is the rest of the car. Quite a heavy beast though and definitely needs a LSD.