N1 oil pumps??

[muaythailuke]

Hi guys,

Doing a rebuild on my motor at moment (RB25DET) which includes forgies, rods, head p'n'p, fully balenced bottom end, cams, new intake/exhaust manifolds lots of other trick bits too.... also got an oil cooler too keep things in check, now should I spend anther couple of hundred $$ to upgrade to a N1 oil pump or is the standard one up to the job??

Once the car is finished I will be doing as many track days, drags, hillclimbs etc as I can but is essentially a street car thats driven pretty hard :burnout:

I would think the water pump should be find as it is a near new item anyway plus I will have a low temp thermistat and 40mm alloy radiator, or should I upgrade this to N1 item too? What about thoughs electric water pumps anyone ever used one of those?? Cause ive been told N1 pumps are build for constant high rpm use and not much good for street use, i know there isnt as many blades in the N1 pump(6 large instead of 8 smaller)

[Savman]

Oil pump is a good upgrade for peace of mind. Also the fact it could save your engine. If your running higher boost and or have oil cooler u need larger oil pump.

don't know about the water pump.

Probably a good idea if your racing to get Gauges for Water Temp and Oil pressure. Then u know what is needed.

[Sydneykid]

Hi guys,

Doing a rebuild on my motor at moment (RB25DET) which includes forgies, rods, head p'n'p, fully balenced bottom end, cams, new intake/exhaust manifolds lots of other trick bits too.... also got an oil cooler too keep things in check, now should I spend anther couple of hundred $$ to upgrade to a N1 oil pump or is the standard one up to the job??  

Once the car is finished I will be doing as many track days, drags, hillclimbs etc as I can but is essentially a street car thats driven pretty hard :burnout:  

I would think the water pump should be find as it is a near new item anyway plus I will have a low temp thermistat and 40mm alloy radiator, or should I upgrade this to N1 item too?  What about thoughs electric water pumps anyone ever used one of those?? Cause ive been told N1 pumps are build for constant high rpm use and not much good for street use, i know there isnt as many blades in the N1 pump(6 large instead of 8 smaller)

Hi Luke, if you had done a search you would have read many times that an N1 oil pump is simply a standard pump with a higher pressure relief spring. By doing a search you would have also found that the N1 water pump is for sustained high rpm use, and as such not so good for a road car. The search button is your friend. As for elecrtric water pumps, there are a number of threads on that subject that would have pooped up when you did a search. The Motorsport forum would have helped a number of times with some good tips when you searched for hillclimbs, supersprints etc.

PS; did I mention that you should do a search?

[muaythailuke]

Thanks Savman and Sydneykid

PS; yes i have seen that seach button there before I always wondered what it did :confused: ............ of cause I did a seach but do you know how many theads come up when you type in "N1 oil pump" and 90% of them are irrelevant to what you are actually looking for :kick:

[confuzion]

I have to admit that is quite true

[West]

Hi Luke, if you had done a search you would have read many times that an N1 oil pump is simply a standard pump with a higher pressure relief spring.  By doing a search you would have also found that the N1 water pump is for sustained high rpm use, and as such not so good for a road car.  The search button is your friend.  As for elecrtric water pumps, there are a number of threads on that subject that would have pooped up when you did a search.  The Motorsport forum would have helped a number of times with some good tips when you searched for hillclimbs, supersprints etc.

PS; did I mention that you should do a search?

So by saying that can anyone just pull the standard oil pump out, give it harder spring and that it, you've got yourself an N1 pump?

[Cubes]

If you are running the Series 1 R33 RB25DET with its small oil pump crank engagement, I'd be inclined to stick with the stock lower pressure RB25DET pump.

The RB25DET pump is fine, it supply's plenty of oil pressure for the rev's a mild rb25 is going to visit, (7000-7500rpm).

If you dead set want the N1 pump and have a S1 R33 make sure you get the R33 N1 pump and buy the crank collar.

I went though the decision when building up my RB30DET.

I decided on the RB25DET pump as I didn't want to spend the extra on a crank collar. At the time the JUN collar I found was ~$600 from memory.

[muaythailuke]

If you are running the Series 1 R33 RB25DET with its small oil pump crank engagement, I'd be inclined to stick with the stock lower pressure RB25DET pump.

even with a oil cooler?

The RB25DET pump is fine, it supply's plenty of oil pressure for the rev's a mild rb25 is going to visit, (7000-7500rpm).

what do you call a mild RB25?? Im hoping for 350rwkw + once the rebuild is done and probably gonna visit 8000rpm now and then.

If you dead set want the N1 pump and have a S1 R33 make sure you get the R33 N1 pump and buy the crank collar.

So the N1 pump isnt just a straight fit to an RB25DET?? I didnt relise that.

I went though the decision when building up my RB30DET.

I decided on the RB25DET pump as I didn't want to spend the extra on a crank collar. At the time the JUN collar I found was ~$600 from memory.

what exactly does the collar do? is it just an adapter of some sort?

Thanks cubes

[Cubes]

I call a mild RB25 some thing that you don't rev excessively.

The R32 N1 pump is a straight fit tothe RB25DET, which is why I said to go for the crank collar and the R33 N1 pump, the pumps are reliable for high rpm.

[Sydneykid]

So by saying that can anyone just pull the standard oil pump out, give it harder spring and that it, you've got yourself an N1 pump?

Yes:cheers:

[Sydneykid]

even with a oil cooler?

what do you call a mild RB25?? Im hoping for 350rwkw + once the rebuild is done and probably gonna visit 8000rpm now and then.  

 

So the N1 pump isnt just a straight fit to an RB25DET?? I didnt relise that.  

what exactly does the collar do? is it just an adapter of some sort?

Thanks cubes  

The N1 pump has NO MORE FLOW, the relief valve simply blows off at a higher pressure. So the oil cooler is irrelevant. If you want more flow to service the oil cooler, then buy a pump that flows more.

There are 3 versions of "RB26 N1 oil pump" that I know off. The R32 one will fit the RB25, the early R33 one will also. The late R33 and R34 won't fit. There is no such thing as an "RB25 N1 oil pump".

You can use an R33 and R34 RB26 oil pump (N1, standard or aftermarket) on an RB25, but the RB25 crank is skinnier at the oil pump flange. So you need a spacer ring (collar) that fits between the crank and the oil pump. I have only used a Jun one and they are not cheap.

My suggestion, use your standard RB25 oil pump (if it is in good condition) and buy a 5 psi higher pressure relief spring from your local spring supplier. For ~$2 you have an N1 oil pump.

[RB26zcar]

Hi Sydneykid, in your opinion, how does the Greddy/Trust oil pump stack up to all the other aftermarket oil pumps for the rb26?

thanks

joel

[Sydneykid]

Hi Sydneykid, in your opinion, how does the Greddy/Trust oil pump stack up to all the other aftermarket oil pumps for the rb26?

thanks

joel

Hi Joel, I wouldn't be surprised if the aftermarket (high flowing) oil pumps aren't made by the same people. The internals sure look similar.

For what they are, they are rediculously expensive. Last engine I built I used a dry sump set up, the cost was similar.

[Fitzpatrick Speed Works]

on a rb30 for a vl im about to start we are going to use a moroso external belt drivin oil pump that we have worked out with gearing will pump around 55l/ph. wheras the stock only does around 19.

[BU5TER]

Hi Joel, I wouldn't be surprised if the aftermarket (high flowing) oil pumps aren't made by the same people.   The internals sure look similar.

For what they are, they are rediculously expensive.  Last engine I built I used a dry sump set up, the cost was similar.

Not saying your wrong Gary but a JUN pump from Greenline is about $1100 or a Trust one from Nengun is about $1140 delivered say we allow $1500 icluding tax, gst

Can you honestly do a new dry sump set up on a RB for $1500 including all lines conections fittings, pump and tank

[Fitzpatrick Speed Works]

no you cant but you can by a three stage scavendge pump for the same money as an aftermarket pump!!!! Then all you need is a resevoir a custom sump scavenge point and line and fittings it could be done for around 3 if you did all the work. Its a very good option for those who are serious!!!!

[muaythailuke]

My suggestion, use your standard RB25 oil pump (if it is in good condition) and buy a 5 psi higher pressure relief spring from your local spring supplier.  For ~$2 you have an N1 oil pump.

Sydneykid