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The mkiv Supra Owners Club

Vvti 2jzge swap


ben_harmer32

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The mechanical side of prepping the engine to drop in is fairly straight forward. The electronics side is going to be a bit of a nightmare if you plan on running the stock GS300 ecu.

 

Off the top of my head, issues you will face are.

 

- The GS300 engine loom is built to connect to an ECU in the engine bay, not in the passenger footwell. So that will all need extending.

- The engine loom differs from a Supra loom in the sense that half the plugs on the GS300 ECU come from the GS300 interior loom, so you will have to replicate this by making your own adapter loom between Supra interior side and GS300 stock ecu.

- However the biggest ballache is that the GS300 uses a Toyota style CanBus system known as multiplex, so in order to make your dash, AC and lots of engine functions work correctly you are going to need to get very creative to get the stock ECU to work with the Supra analog non canbus inputs.

- You will also have the comlexity of getting the stock TT autobox or GS300 autobox working correctly on top of the above.

 

If you aren't comfortable wiring then you are going to have fun doing the above. It's a lot of work. I've just finished working on a GS300 that uses a standalone ECU and had to tackle all the above in one way or another, wasn't fun.

 

Personally in your situation I would just use the GS300. Or use a standalone ECU with the vvti engine in your supra, the loom you will have to make will be far easier & quicker to sort out. Although you will still have the issue of controlling autobox.

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Why cant you get a vvti mkiv ecu to run the head.

 

Same non canbus issue I suppose. But I dont know I differences there are there.

 

Ben I'd be going vvti. The response is worth the effort mate. It's an engine upgrade.

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Why cant you get a vvti mkiv ecu to run the head.

 

Same non canbus issue I suppose. But I dont know I differences there are there.

 

Ben I'd be going vvti. The response is worth the effort mate. It's an engine upgrade.

 

VVTI MKIV ECU is calibrated for a turbo motor. Many things it's expecting to see and use will be different like MAF, Injectors, Boost (or lack thereof), VVTI strategy etc etc, so hard to say if you could fudge it enough to play ball and deliver a good driving experience.

 

That said, I agree VVTI is a no brainer for performance, but for a relatively stress free install you will need to do it like AC93 and use a standalone to control engine.

 

I believe the only Supra's that ever existed with 2JZGE VVTI motor from factory were a limited run of late US-California spec cars. Even if you could get a loom & ecu from one of these cars (I'm assuming they are rare to find), it would be for a LHD setup so again you would have to extend it. Might as well just build a nice custom loom for something like an ECUMaster, will be quicker and probably the same money

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So if i use a non VVTI engine from a GS300 is that just swap the sumps and bolt in? :)

 

Yes in the mechanical sense.

 

Electronically you will need to extend the ecu loom and mess around with interior plugs again as the gs loom is very different.

 

However you could also get a supra nom non vvti engine loom, transfer that onto engine then it will be plug and play

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Yes in the mechanical sense.

 

Electronically you will need to extend the ecu loom and mess around with interior plugs again as the gs loom is very different.

 

However you could also get a supra nom non vvti engine loom, transfer that onto engine then it will be plug and play

 

Perfect! i'll do the loom swap. Thanks Mike! :D

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