Auto Trans

[kjb_r33]

Can anyone tell me if the trans used in a 93 r33 has any similarites to any nissans trans sold locally. I think im going to have to do a overhaul on mine, and was wondering if i can get the parts from a nissan dealer???

Maybe even heavy duty parts???

Thanks

[rs73]

not sure about it, best bet is goin to import wreckers.

or to beef up the auto, these guys may be able to do it

(adjusting torque converter + trans cooler)

http://www.dominatorconverter.com.au/about.html

not sure if they will ship interstate, but I reckon there should be similar workshop where u are.

[kjb_r33]

Well, found out something interesting today.

Seems the RE4R01A auto trans in the skylines is also in the Patrols. A common problem with them also is the pressure control solenoid, which it what i think is my problem...

[rs73]

What's the pressure control solenoid in auto trans do actually? Is it something to do with the torque converter? or getting slippage not transferring all the power?

[kjb_r33]

The pressure control solenoid controls how hard the bands and clutches apply, and hold. Heavy throttle means more power, so the bands and clutches have to apply harder and hold more, light throttle, not as much pressure is applied, mainly to save fuel. Higher control pressure means the pump has to work harder, which drags more power from the engine. If the pressure is too low, ie, heavy throttle but low pressure, the bands and clutches tend to slip, which causes engine flaring on gear changes....

[rs73]

that's pretty cool explanation...

so is this situation can be remedied by putting a stronger pump or some sort of stronger hose so no pressure is lost?

[kjb_r33]

Pumps a crescent type pump, they put out more than enough pressure. There is no hoses in a trans, just stell pipes and galleries in the housing or valve body. The problem occurs when the pressure control solenoid dumps excess pressure back to the transmission pan, instead of directing it to the band servos and clutch packs.