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R34 N/A vs turbo automatic gearbox

Batchy186
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Batchy186 Rookie

Batchy186

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Hey guys,

Just wondering if anyone knows if there’s a difference between the turbo and N/A gearboxes for R34’s? From my current understanding the gt’s have a tcu, where the gtt’s box is controlled through the ecu, is there any actual difference in the box? Also because theres a tcu does that open up your auto aftermarket ecu options?

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Kinkstaah Grand Master

Kinkstaah

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Yes the box is different. The auto shop that pulled both of them apart from me back in the day was surprised how different they were internally.

The pinout diagram for the TCU lines up with the pinout diagram for the GTT Ecu. It's not so much 'different' as much as it is integrated into the GTT ECU.

The only auto mod you make on a NA auto box is you take it out and leave it out. It will not stand up to any power, even if you build it.

Swapping to GTT gear is going to require extensive knowledge and study of the wiring diagrams. If you are paying someone to do this, it is not that feasible/cost effective.

There is a reason 100% of people go manual.

Don't want to go manual? Can't afford the conversion to go manual? Can't drive manual and don't want to learn? Sell the car.

This is the ballad of the NA Auto Skyline.

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Batchy186 Rookie

Batchy186

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2 hours ago, Kinkstaah said:

Yes the box is different. The auto shop that pulled both of them apart from me back in the day was surprised how different they were internally.

The pinout diagram for the TCU lines up with the pinout diagram for the GTT Ecu. It's not so much 'different' as much as it is integrated into the GTT ECU.

The only auto mod you make on a NA auto box is you take it out and leave it out. It will not stand up to any power, even if you build it.

Swapping to GTT gear is going to require extensive knowledge and study of the wiring diagrams. If you are paying someone to do this, it is not that feasible/cost effective.

There is a reason 100% of people go manual.

Don't want to go manual? Can't afford the conversion to go manual? Can't drive manual and don't want to learn? Sell the car.

This is the ballad of the NA Auto Skyline.

Yeah man, i’m planning on manual swapping, just wanted to make sure that i was happy with the decision 

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joshuaho96 Veteran

joshuaho96

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37 minutes ago, Batchy186 said:

Yeah man, i’m planning on manual swapping, just wanted to make sure that i was happy with the decision 

Unless you're putting a wet clutch DCT or a ZF6HP or ZF8HP manual is the way to go. Automatics that don't have the lockup clutch running in all forward gears and modern shift logic are just really frustrating on something nominally meant to be high performance.

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Kinkstaah Grand Master

Kinkstaah

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On 8/31/2023 at 10:46 AM, Batchy186 said:

Yeah man, i’m planning on manual swapping, just wanted to make sure that i was happy with the decision 

Nobody ever regrets it...

There's probably some merit to go off the deep end and end up with a BMW DCT or ZF8 as above, but it's not really a viable path forward unless you bought the car with this kind of knowledge in your head from previous car endeavors and had the skills, money, and patience to pull it off.

Given R34 N/A's are usually bought by young folks just buying their first performance car... this is statistically unlikely

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