32GTR-33GTST PSteer Pump Swap

[ADM]

Does anyone know if the power steering pump from the R33 GTST will work with the R32 GTR rack? I no longer run the HICAS in the GTR and as I’m rebuilding my power steering pump I thought it might be an idea to remove the GTR's tandem pump and swap it with the R33's. It would be a lot neater now the HICAS is out and cheaper to rebuild too. I’m assuming there is no technical reason why this can’t be done?

[Scooby]

Does anyone know if the power steering pump from the R33 GTST will work with the R32 GTR rack? I no longer run the HICAS in the GTR and as I’m rebuilding my power steering pump I thought it might be an idea to remove the GTR's tandem pump and swap it with the R33's. It would be a lot neater now the HICAS is out and cheaper to rebuild too. I’m assuming there is no technical reason why this can’t be done?

ADM;

search on the forum for previous posts by Sydneykid, he explains everything pretty much in detail. AFAIK the conversion is straightforward but the drive belt needs to be changed; another option might be to use the pulley off the 32 pump? Also the guys at SSS Automotive in Sydney have the details on this conversion. I have an R33 pump sitting in my shed ready to go onto a 32 GTR. Would be interested to know how you get on.

[ADM]

Thanks Scooby,

Im picking up the 33 pump and brakets today. The pump will be rebuilt next week and will be going back on when the engine rebuild is complete(2-4 weeks).

Ill let you know how I get on with the conversion as I go along.

[ADM]

Well, the R33 pump seems to be offset forward when bolted up to the block and the pully is smaller which isnt such a good thing when running at 8000rpm on track days. The pulleys can't be easily swapped, so its back to removing the fins in the back of the tandem pump and plugging the outlet.

[Sydneykid]

Well, the R33 pump seems to be offset forward when bolted up to the block and the pully is smaller which isnt such a good thing when running at 8000rpm on track days. The pulleys can't be easily swapped, so its back to removing the fins in the back of the tandem pump and plugging the outlet.

Did you use an R33 GTST pump or an R33 GTR pump? Did you use the R32 pump mounting bracket (to the block) or the R33 pump mounting bracket?

[ADM]

I used all R33 GTST parts SydneyKid. It would be possible to fix the offset but Im more concerned with the smaller pulley working the pump and fluid nice and hard during constant high rev conditions

[Sydneykid]

I used all R33 GTST parts SydneyKid. It would be possible to fix the offset but Im more concerned with the smaller pulley working the pump and fluid nice and hard during constant high rev conditions

Mmmmmmmmm, I will have to measure the pulleys, I know the R33 GTST pump has lower flow rates, so maybe that's why the pulley is smaller. It was one of the fuel economy and low speed emissions measures, reduce the load from the power steering pump. It would be logical that to reduce the load they increased the rpm of the pump and reduced the torque loading on the impeller.

Since the R33 pump (compared to the R32 pump) has less flow at the same rpm, I don't think you will have a problem.

[ADM]

Thanks SydneyKid for the technical insight (as usual).

I’ve decided to stick with the original pump, remove the fins from the rear pump section, block that sections outlet and rebuild the remainder. It’s not as neat as I would have liked but it saves reinventing the wheel (or pulley in this case)

[Birth]

ADM, when modfying the R32 pump did you remove the fins only or the whole wheel that they move around with as well?

Thanks.

[PHATR32]

the whole lot can come out.