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pet vl

How do i drop an n1 pump pressure

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So i have a 25/30 with n1 pump and iam wanting to drop the pressure of the pump to like 60psi on full revs some one told me that thort you can take a spring out of the pump dose any one know

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I believe you can add or remove shims. I'm not sure why you would want it as low as 60psi at full revs though

You have to take the sump off to get to the relief

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Yer iam happy to take the engine out and sump of just didn't no what to do with the pump and the springs - shims

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15 hours ago, pet vl said:

So i have a 25/30 with n1 pump and iam wanting to drop the pressure of the pump to like 60psi on full revs some one told me that thort you can take a spring out of the pump dose any one know

If you want to lower the pressure you need to replace the spring with another, softer one. I did this on mine but its a Tomei not a Nismo pump and it easy as it has an external adjustment. 

Frankly I wouldn't bother.

 

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I was going to get the tomie one but i wanted a spline drive gear set the it takes ages for the pressure to come down and only comes down to 85-90 takes over half an hour to come down i want to start racing it so with oil pressure at 130-140 +for the first half hour of driving its not an option any more

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3 hours ago, 89CAL said:

If you remove the spring you will have no pressure....

I was told there is 2 springs in it

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What's the actual problem of running that oil pressure?

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Yer its a n1 oil pump with spool spline drive gears its just how long it takes to come down running 140 plus oil pressure iam not so keen on my tuner thinks it has the potential to blow the filter of and with that much oil pressure fills the head

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What weight of oil are you using? Maybe an RB25 spring will get your pressure down. You should be able to compare spring pressures when you have the pump out.

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5/30 i still have a 25 pump so will look when the engine is out i just wanted to get all the facts before  

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Change the grade of oil you're using first. eg. if you're using a 25w60, go to a 10w40.

There's a lot of effort to remove/refit an engine, an oil change won't cost much as an experiment.

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I dont really see a problem here. Cold oil is thicker so you will run higher pressure until it warms up. As far as I'm concerned, 60psi at full revs is far too low. Mine runs around the same oil pressure when its warm, im not sure why yours is so high when its cold.

Simple fix - dont rev it until its warm.

Im guessing you have an oil cooler? Does it have a thermostat in the system? Sounds like it doesnt. My oil gets up to temp after about 5-10 mins of light driving

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Nop no oil cooler put it this way i can drive

55 ks before it comes down and when i want to race its no good if the oil pressure is 130-140 psi or will go around back to 0psi of the gauge

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It sounds like you have something else wrong. You are only able to adjust the relief. Oil will not reach this pressure at idle and you should not be taking that long to get the oil temp up

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