GS300_BORICUA

My buddy who is a tecnician for Honda told me that the inline 6 in my GS300 is an updated Supra engine. Is this true Lexus gurus out there?

LexusRules

Hey, yea its a 2JZ-GE engine (our GS300) and the supra engine is the 2JZ-GTE engine, the GTE has a different intake manifold and slightly different head, it also has twin ceramic turbos. but the 2JZ means the block, which is the bottom of the engine, is the same, so that means you've still got one of the stongest engines in the world under your hood.

In japan the V300 is a GS300 with the 2JZ-GTE motor, with a 4-speed manuel gearbox. The V300 engine can be installed in your car, or you can get a bolt-on turbo kit which is basiccly the same.

anthracitetarga

iTrader: (1)

Sasha is right...once again. LOL The SC's also have the 2JZ-GE engine. If u were going to have an engine swap, go along w/ the Supra TT engine, b/c the V300 engine isn't quite as powerful (at least this is true w/ the Japanese Soarer 2.5 turbo)

LexusRules

thanks man, haha actually the reason teh soarer turbo engine is underpowered is cause its not a 2JZ motor at all, something compleatly different with smaller displacement. the V300 and Supra motor are identical, but the boost pressures may be different, but either way if you buy the 2JZ-GTE motor you can make it have 500RWHP for only about 600 dollars worth of electronics...

GlobeCLK

iTrader: (5)

The Soarer 2.5GT in Japan uses the 1JZ-GTE, which is the 2.5 liter inline 6. Smaller displacement compared to the 2JZ.

Richie

I'm curios how much a full conversion will cost.
I'm talking about a TT engine and 6-speed box.

v300

Sasha,

The JZS16#'s never came with a factory manual transmission. But you are right about the 4-speed tranny (automatic). $600 in electronics will not get the V300 to 500rwhp without the assistance of direct port nitrous injection. Seriously expect to get around 433rwhp given boost setting at 1.25bar on basic performace upgrades.

People interested with conversion,

Yes, the 2JZ-GTE VVT-i will bolt in. Your heater core has to be modified and the A/C line has to be redone also. The stock US 5-speed transmission is rather weak compared to the 4-speed auto. You should use the 4-speed tranny. Because of the tranny, you'll need to make a hybrid driveshaft (front Supra 4-speed auto and rear half stock US GS). You will also need the correct wiring harness and ECU. As for the fuel system you need the Supra Twin Turbo's fuel pump. For some reason the US GS300s do not come out of the factory with a fuel return which you defintely need.

Reality check: you can convert the GS300 into a V300 or a Supra Twin Turbo (non-VVT-i). Both are different in respects to wiring. The V300 runs I believe a 160pin connector and the Supra Twin Turbo 93-97 runs a 128pin connector. The V300 components are rare thus cost more than Supras. The majority of the V300's connectors are direct bolt on to the GS300's current connectors for a few relocations. In other words wiring the 98+ GS into a Supra will be hell work. I do not know how much it would take to convert GS to Supra... inquire with Bruce Nomura about that procedure and be expected to pay more than 15K in parts and labor. As for the V300 conversion I think I spent a bit too much But my car is very fun.

Richie,

Regarding the 6-speed... there are no provisions on the 98+ GS to allow a manual tranny. Custom fabrication is to be expected. I tried.

GlobeCLK

iTrader: (5)

very informative, V300!

So the 4 speed auto in Aristo V300s are stronger than the 5 speed auto we get here? What kinda power can the 4 speed hold? What about the 5 speed we have?

And it's easier to get V300 conversion rather than Supra TT Conversion....

After V300 conversion, will everything work fine, or will there be small problems such as some trip computer readings being inaccurate, or other small glitches?

thanks in advance

v300

GlobeCLK,

I know that the factory (Supra/Aristo) 4-speed auto tranny can support 500rwhp reliably and is good for up to 550 rwhp with a tranny cooler. Area 51's IS is already making 380rwhp and tranny is not slipping or choking. I think only SRT can answer that question on the durability of the stock 5-speed. They offer a tranny rebuild package once the tranny surpasses 380+ rwhp. Only the SRT guys can verify this.

From experience the V300 conversion will give you less of a headache than doing the actual Supra (component) swap on a 98+ GS300. However, everything is not plug and play... so buyer beware! :eek:

In regards to the glitches all the mechanics and gauges seem to be working ok. No check engine light thank goodness. However, one amenity on the GS is rendered useless. It doesn't affect driveability though. Also once in a while I do encounter occasional oil leaks and when replacement parts are a b_tch.

Glad to be of service.

MrHorse

Where's that turbocharger for the V8??!!

LexusRules

what would be the major disadvantages of a bolt on turbo kit? i'm trying to think... is the intake manifold weak?

i need to learn more about my 2JZ-GE to GTE conversion more eh? haha thanks man

v300

There is not really a major disadvantage for a bolt on turbo kit. If all the plumbing goes into place it will work given you follow the general precaution of lowering compression ratio and provide a fuel return on the current GS. Also pray that your fuel management system is reliable. Stand-alone systems seem to be the key. The A'Pex-I S-AFC can only do so much. In regards to the NA intake manifold, I actually like that design over the GTE's. Good luck.

The only disadvantage is that you will not have the cool teal/aqua marine "2JZ-GTE VVT-i Twin Sequential Turbo" engine cover.

Richie

v300, I would like to thank you for your info.
It's very informative.

So it can be done, but it's going to be a pain in the a$$.

GlobeCLK

iTrader: (5)

so bolt-on turbos seem to be the most cost-effective and the least trouble turbo huh?

Richie

But I would realy like a 6 speed.

Oh well, back to saving some more money.