JUN Oil Pump upgrade on R33 GTR

[Blitz]

Hi all,

I am looking at an JUN oil pump for use in an R33 GTR and have read that JUN also recommends using their crank/oil pump collar in conjunction with this pump on "earlier" GTR's.

Can anyone confirm if the JUN pump can be used on its own or if the additional purchase of the matching collar is essential for fitting in an R33?

Thanks

[GTRgeoff]

Nick, the collar is needed to extend the drive flats for the oil pump in early RB26 engines (R32 I believe this is limited to). I've seen the wear marks on the pump drive and understand the concerns. Yours should be good.

Remember the RB26 is pretty much a complete engine out to do the oil pump. What else are you planning?

Why change the pump? are you having pressure problems?

[Blitz]

Thanks Geoff

Just preparing my shopping list so to speak When the time comes the JUN or Trust pumps look to be the preferred option rather than an N1.

I did notice Trust rate their oil pump only marginally higher than the JUN equivilent

I wouldnt mind hearing from someone who is running the Trust pump as well

[GTRgeoff]

I think Paul in WA (GTST VSPEC ?) is running a good pump.

[BU5TER]

I'm using a jun oil pump, you don't need a collar with the R33 crank

[Blitz]

Thanks Brett

[gtr fan]

Babak's car has a JUN oil pump doesn't it? Didn't Andrew put one in it?

[BU5TER]

Yeah I'm pretty sure after the 1st build with the N1 Andrew used a jun pump

[RB26zcar]

I bought a pump that was only used for mock up of the engine from a guy, but when I received it (all the way from Japan) the rear cover has GREX on it.

I'm assuming this is made by the same mold because I took it apart and compared it to another pump that had JUN on the back cover.

Is there one main Co. making these uprated pumps, then sourcing them out for re badging?

Is my pump with GREX really a Greddy or Trust pump??

PLEASE ADVISE

thanks

joel

[Blitz]

Grex is Trust/Greddy's engine hardware label

gtr fan: Yes kababs car is using the JUN pump

[RB26zcar]

Thanks Blitz.....

:confused: Sorry to stray off topic, but can anyone that knows from experince tell me if the Grex / Trust oil pump is as good a quality as the Jun etc.

thanks again...

[DoughBoy]

Trust one is virtually the same as the Jun one, ones that are a bit better are the Tomei, HKS and Nismo.

[R32-GTS]

I have the Jun oil pump in my 26 and it is doing a really good job. I think the trust and jun pump are almost exactly the same just have different badging.

[Blitz]

This is the information that i was after, I had a feeling the Trust and JUN were very similar.

Doughboy: How do the Nismo/Tomei pumps differ from the JUN/Trust items?

[DoughBoy]

Trust and Jun use a modified Nissan oilpump casting, where the HKS/Nismo have the same aftermarket casting. I think they are the same pump, or are made by the same foundry? The Tomei one features the largest oilpump gears in the universe, again in a custom case. All of them use their own oilpump gears, with wider, larger teef. Also features the pressure relief outside the case, so you can adjust the pressure externally without taking the car to pieces. Although there are other aftermarket devices you can adapt to do that without paying through the nose for a Tomei pump.

Although you pay for the difference, I think GTR-700 has shown the Jun pump capable of decent longevity and flow, so I'm not sure it's necessary to go further.

[RB26zcar]

This one has the fitting welded to the pump....

This is why I like the Trust oil pump over the regular castings of the oem and N-1 pump.

I'm making up a external pick up into a custom alum oil pan to go on my rb26 powered Z car.

The standard casting oil pump does not provide enough "meat" for a tapped fitting to be used. The custom pan is needed for the rear sump placement in the Zed....

[R32-GTS]

I think the Jun pump is rated at slighly higher flow then the trust and nismo.

[Blitz]

According to the Trust website, they rate their pump only slightly higher than JUN (Based on flow rates at 6,000 rpm)

[DoughBoy]

I wouldn't believe any of the stated figures, of course they are going to flow a million liters an hour and add 400hp to any engine

[Gav]

Bear in mind these aftermatket oil pumps can empty a std rb26 sump at high rpms faster than the oil can return back from the head.

Consider an oil restrictor or sump upgrade as well.