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How to tell an auto conversion

lizzy176

By lizzy176,
in Drivetrain and transmission

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lizzy176 Rookie

lizzy176

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How to tell an auto conversion

New to forum so excuse if this is the wrong spot. I have a  r34 gtt and was recently replacing my radiator. The old (standard) radiator had two lines looped from the radiator to (what i think is) the powersteering cooler and back to the radiator essentially doing nothing. Now can someone tell me if its actually an auto trans cooler thats been left behind from an auto conversion and how do i tell if its been converted to manual.

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GTofuS-T Grand Master

GTofuS-T

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I imagine the build plate should have some indication of whether it's Manual or Auto from factory.

Example: (RE4R01B is the auto trans code, not sure what the manual code is, someone else may be able to help there)

4.JPG

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KiwiRS4T Grand Master

KiwiRS4T

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Yep the blue build plate will tell you what kind of Trans was original. Also the fuses under the battery may have been shorted out to simulate Park for starting - there may be a gear position indicator on the cluster although it could have been blanked out.

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GTSBoy Grand Master

GTSBoy

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If still using factory ECU, then the auto ECU will happily run the manual car.  You can tell if it's an auto ECU from the part number, or from opening it up and finding the TCU module on the main board.  ECU is unlikely to have been changed in a manual conversion.

The other is the diff ratio.  Manuals are 4.11.  Autos are 4.083.  Unlikely to have been changed in a manual conversion.

On the topic of coolers......the R34 PS cooler is a small core, about 150x200mm or perhaps a bit smaller.  The transmission cooler (if it has a separate core) is larger.  Neither of these have anything to do with the radiator.  The PS cooler only has hoses with PS fluid in them.  The auto cooler on has hoses with tranny fluid in it.  If you have a core that has hoses that pass through the bottom tank of the radiator.....I'm not completely sure what to make of that.  Would have been easier to just remove the extra core and the hoses.  If you cannot find a core for the PS cooler, then you really should have one.  Consider re-instating it.

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KiwiRS4T Grand Master

KiwiRS4T

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On 9/11/2017 at 9:52 AM, GTSBoy said:

.  The transmission cooler (if it has a separate core) is larger.  Neither of these have anything to do with the radiator.  The PS cooler only has hoses with PS fluid in them.  The auto cooler on has hoses with tranny fluid in it.  If you have a core that has hoses that pass through the bottom tank of the radiator.....I'm not completely sure what to make of that.  Would have been easier to just remove the extra core and the hoses.  If you cannot find a core for the PS cooler, then you really should have one.  Consider re-instating it.

Auto fluid passes through a heat exchanger in the bottom of the radiator.

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GTSBoy Grand Master

GTSBoy

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1 minute ago, KiwiRS4T said:

Auto fluid passes through a heat exchanger in the bottom of the radiator.

My point was that if he has a separate core that is connected to the auto's original HX in the bottom tank.....then I didn't know what to make of that, because it sounds like a cludge.

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