shimming oil pump

[trikzlane]

can anyone shine some light on how to shim a 4ag oil pump for more pressure,
pics or explain

[Gunner]

remove pressure release valve, add shim behind the spring and reassemble, I use a washer with a 3mm height.

[KENut]

Wham bam thankyou Gunner

PS check your pump has tight tolerances, due to their design they need to be in good nick to work well. So like no scoring on the faces etc

[Touge Boy]

I bought a HKS "pressure up" kit for around $60. Comes with a new washer and a different spring.

Apparently give oil pressures of 2-3 bar @ 500-1000 rpm, and 6-7 bar @ 2500 rpm +. So about 10-12 more PSI @ full noise.

I currently have a different washer in there, My car currently makes around 90PSI with the boot in.

Will be installing this on a new oil pump, so wanted the new kit to go with it.

[trikzlane]

where did you buy this from? hks website

[Sam-Q]

yeah whats that worth? I don't know why they would need a washer in conjuction with a new spring

[Gunner]

sounds like a bit of a gimmick to me, though I suppose, if it wasn't high enough with the spring alone, then the washer could be added.

I'd rather the 60c washer over the $60 kit.

[Touge Boy]

where did you buy this from? hks website

Bought it from RHD Japan. But Ive seen it ona few websites, and ebay.


yeah whats that worth? I don't know why they would need a washer in conjuction with a new spring


sounds like a bit of a gimmick to me, though I suppose, if it wasn't high enough with the spring alone, then the washer could be added.

I'd rather the 60c washer over the $60 kit.

Im already using the washer, but i figure with a new oil pump and the HKS kit, if I get over 100psi of oil pressure, then money well spent and cheap insurance. If it IS a gimmick and does what a 60c washer would do, I still have a fresh oil pump and it was only a $60 lesson learnt.

[jdm86gtz]

Doesn't the HKS kit come with a restrictor for the oil feed to the head also?

[Touge Boy]

Nope, just the spring and the washer.

Wondering if the restrictor is something I should look at though. Didnt think of that.

[Sam-Q]

I have never heard of anyone fitting a restrictor to a 4age, I just assumed it was for stupid nissans

[jdm86gtz]

The picture in the link shows a brass restrictor but maybe it's not a 4AG kit shown
http://www.rhdjapan.com/hks-pressure-up-kit-4a-g-52781

[Touge Boy]

Well thats the page I ordered it from> We'll know soon enough if it comes with it. Didnt even notice it.

Dont know if 10psi more is enough reason to use a restrictor?