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quick question on gearboxes

xr8eater
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Sydneykid Grand Master

Sydneykid

Posted
Posted

Yep, you left off console, pedals (you have to change the brake pedal, as well as add the clutch pedal), clutch master cylinder, speedo drive, tail shaft, gear lever, spiggot bearing and probably a few more incidentals.

Revhead Grand Master

Revhead

Posted
Posted

Yes you can use an auto ECU, I have seen many over the years doing exactly this. All you have to do is short the neutral cutout switch, so that the ECU permanently sees neutral. The mixtures are out a bit as the ECU sees neutral when you're obviously in gear and putting load on the engine, and apparently the mapping is different between the two as well.

Sydneykid Grand Master

Sydneykid

Posted
Posted
so what would be better rb26dett box or a rb25det box with an auto diff any problems fiting

the gtr box apart from removing the transfer case

They are internally the same, so there is no real "difference". I suggest you have a look at a GTR gearbox, simply "removing the transfer case" is not an option.

rs73 Grand Master

rs73

Posted
Posted

You can use Auto ECU and get away with it but u may not get optimum result. Checkout the dyno sheet below, which is a manual conversion R33 GTS-t still using the original Auto ECU. See where the auto ECU cut power to allow the auto gearbox to shift (cos it thinks the auto's still there).

You'd get better result with Manual ECU. Also have a look at my leaner A/F ratio, so you gotta be careful with boost not to get it too lean and detonate your engine.

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