Go Back   Infamous Nissan - Hardbody / Frontier Forums > Model Specific > Hardbody Forum (D21)

Reply
 
Thread Tools Display Modes
Old 08-02-2015, 08:29 PM   #1
Foul_Mouth
Infamous Autocrosser
 
Foul_Mouth's Avatar
 
Join Date: Mar 2010
Location: Western NY
Posts: 3,395
Vehicle: 1986.5 4WD Reg Cab/ 1991 2WD Reg Cab(Red)/ 1995 2WD Reg Cab(Green)/ 1992 WD21 4WD PathFinder
Thanks: 257
Thanked 463 Times in 373 Posts
Default Nismo Oil Pressure Spring Set...What to expect.

A few years ago I purchased a set of oil pressure springs from Nissan Motorsports for my green autoX truck. Today I felt the energy to tackle installing them.

First off many thanks to Shawn Pritchard of Destiny Racing, he is the Datsun guru. You know you are good when you are caring for the late Paul Newman's old race cars. Shawn taught me all I needed to know to be able to experiment until I was happy. He is a good friend!

Things you will need to consider.
1) How hog-wild is your motor?
2) Are you actually abusing it enough to warrant changing anything? If it's stock and it's taking you to work and back then I would say this article won't be needed for your engine.
3) Drifter? Autocrosser? Rallycrosser? Drag Racer? Yeh this might help you.

I can tell you this much right off the bat...using both inner and outer Nismo springs will gain you well over 80psi at 4000rpm. That's 20 more psi than a real track-only Datsun race prepped engine uses. Stock the KA24e wants to see between 65-70psi at 3200rpm.

***If you have not installed an oil psi gauge in place of the idiot light you will want to do that before continuing anything in the article.***

80+psi is overkill!!! You'll pop a gasket at those pressures unless you have built the motor around that.


*OEM (on the right) vs. Nismo Inner and Outer Springs (both on the left)
*Also pictured is the cap you need to remove from the pump along with two washers that measured .463" in diameter which are also an option for adjusting pressure.


You start out as with any other under vehicle project, on good ramps or using jack stands.


1)Remove the lower splash shield...easy!

2)Look for the oil pump. It is located on the intake side of the block behind the alternator. There you will find a large bolt head (I used a 24mm wrench but I think it is actually 22mm). Loosen that bolt and remove it using caution that a little bit of oil and the spring will be wanting to come out of that hole.


So now what? You have the spring out in your hand and you are trying to decide what combination will give you the desired oil psi that your engine requires.

Based on my experimenting this is the guideline I came up with.
*Bear in mind that if you are running an external oil cooler or your engine is tired your readings might be different and may require further experimenting with different spring and washer combinations.

Stock (One OEM Spring)
-Idle with 15w40 = 15psi hot
-4000RPM= 65psi

Nismo (both springs)
-Idle w/ 15w40 = 22psi
-4000RPM= 80+psi maxed out gauge
-Ran strong and oil pressure response was instant.

*Both Nismo Springs

Half and Half = (OEM Outer/ Nismo Inner)
-Idle w/ 15w40= 20 PSI
-4000RPM= Never checked, oil was pegging 80+psi at 2000RPM

Old Datsunhead Setup (OEM with stacked washers)
-Idle w/ 15w40= 18-19PSI
-4000RPM= 75psi peak.
-Oil pressure response not as quick as it was with both Nismo springs but the benefit was no longer pegging the oil gauge. Good Idle psi.

*These are the washers given to me to use by a Datsun guru friend of mine. They measure .463" outside diameter. They go between the cap and the spring. Each washer will increase oil pressure by 5psi.

Large Nismo Outer Spring Only
-Idle w/ 15w40= 10psi (very slow to get to this with some engine noise)
-4000RPM= 40psi max
-Instantly I knew this was not good so I only ran it for a moment to get actual numbers then shut it down.



I did not run the tiny inner spring by itself. Even though the Nismo catalog says this is possible I did not feel comfortable after seeing the results of the large spring only. Running them as a pair makes the most sense but not for a stock motor.

Final setup I went with was the old Datsunhead setup. While not as quick on the draw as the dual spring setup it still gives good pressure both on and off-idle. Luckily these Nismo springs cost me very little back when I bought them.

If after reading this you feel the need to play around with this here are the Nismo part numbers for the springs.

15133-E4620= Inner Spring
15133-22010= Outer Spring

KA24e engines already share the same oil pump as the turbo ZX so no mods are needed to use these springs.

Always use caution and common sense when working on vehicles of any kind. My numbers are merely a guideline and your results can vary.

Thanks for looking!

And don't forget the coffee!
__________________
Nissan Truck Videos (Builds-Racing-Shows-Tech)
https://www.youtube.com/c/NissanTruckguy









Last edited by Foul_Mouth; 08-02-2015 at 08:59 PM.
Foul_Mouth is offline   Reply With Quote
Thanked by:
Hardbody92 (08-02-2015), Josh_TXD21 (08-16-2017), Realred96 (08-03-2015)
Old 08-03-2015, 02:12 AM   #2
ahardb0dy
The Post Count Whore
 
Join Date: May 2014
Location: Sorrento, Florida
Age: 51
Posts: 6,638
Vehicle: 1993 Nissan Hardbody
Thanks: 56
Thanked 722 Times in 680 Posts
Default

how thick are the washers?
__________________
My name is Tony and I'm a Infamousaholic

Current truck - 1993 Nissan Hardbody king cab 2wd
, (formerly owned: 90 Nissan Sentra, 94 Nissan Pathfinder SE 4x4, 05 Nissan Titan, 87 Nissan SE-V6 4x4 king cab, 94 Infiniti Q45t & 80 Datsun 310GX )
ahardb0dy is offline   Reply With Quote
Old 08-03-2015, 02:36 AM   #3
Foul_Mouth
Infamous Autocrosser
 
Foul_Mouth's Avatar
 
Join Date: Mar 2010
Location: Western NY
Posts: 3,395
Vehicle: 1986.5 4WD Reg Cab/ 1991 2WD Reg Cab(Red)/ 1995 2WD Reg Cab(Green)/ 1992 WD21 4WD PathFinder
Thanks: 257
Thanked 463 Times in 373 Posts
Default

1/16" thick.
__________________
Nissan Truck Videos (Builds-Racing-Shows-Tech)
https://www.youtube.com/c/NissanTruckguy








Foul_Mouth is offline   Reply With Quote
Thanked by:
Josh_TXD21 (08-16-2017)
Old 08-03-2015, 03:39 PM   #4
Foul_Mouth
Infamous Autocrosser
 
Foul_Mouth's Avatar
 
Join Date: Mar 2010
Location: Western NY
Posts: 3,395
Vehicle: 1986.5 4WD Reg Cab/ 1991 2WD Reg Cab(Red)/ 1995 2WD Reg Cab(Green)/ 1992 WD21 4WD PathFinder
Thanks: 257
Thanked 463 Times in 373 Posts
Default

Oh it's a sticky now. Cool!
__________________
Nissan Truck Videos (Builds-Racing-Shows-Tech)
https://www.youtube.com/c/NissanTruckguy








Foul_Mouth is offline   Reply With Quote
Thanked by:
alabama_lowlife (08-03-2015), Josh_TXD21 (08-16-2017)
Old 04-04-2016, 04:01 PM   #5
henryloyajr
 
Join Date: Dec 2012
Location: Houston
Posts: 1
Vehicle: Nissan Pathfinder 2006
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Do you happen to have the part numbers for the washers? Do these go in the large bolt head side?
henryloyajr is offline   Reply With Quote
Old 04-04-2016, 05:12 PM   #6
ahardb0dy
The Post Count Whore
 
Join Date: May 2014
Location: Sorrento, Florida
Age: 51
Posts: 6,638
Vehicle: 1993 Nissan Hardbody
Thanks: 56
Thanked 722 Times in 680 Posts
Default

I think they are just standard washers you can get anywhere, just need to get the same as was specified:

"These are the washers given to me to use by a Datsun guru friend of mine. They measure .463" outside diameter. They go between the cap and the spring. Each washer will increase oil pressure by 5psi."
__________________
My name is Tony and I'm a Infamousaholic

Current truck - 1993 Nissan Hardbody king cab 2wd
, (formerly owned: 90 Nissan Sentra, 94 Nissan Pathfinder SE 4x4, 05 Nissan Titan, 87 Nissan SE-V6 4x4 king cab, 94 Infiniti Q45t & 80 Datsun 310GX )
ahardb0dy is offline   Reply With Quote
Old 04-04-2016, 05:40 PM   #7
Foul_Mouth
Infamous Autocrosser
 
Foul_Mouth's Avatar
 
Join Date: Mar 2010
Location: Western NY
Posts: 3,395
Vehicle: 1986.5 4WD Reg Cab/ 1991 2WD Reg Cab(Red)/ 1995 2WD Reg Cab(Green)/ 1992 WD21 4WD PathFinder
Thanks: 257
Thanked 463 Times in 373 Posts
Default

Yep standard washers. Mine are nothing fancy other than they were given to me by a friend who tends to multiple vintage Datsun race cars including one owned by Adam Corolla. I am kind of forced to trust his judgement at that point LOL!
__________________
Nissan Truck Videos (Builds-Racing-Shows-Tech)
https://www.youtube.com/c/NissanTruckguy








Foul_Mouth is offline   Reply With Quote
Old 09-16-2016, 09:56 AM   #8
ahardb0dy
The Post Count Whore
 
Join Date: May 2014
Location: Sorrento, Florida
Age: 51
Posts: 6,638
Vehicle: 1993 Nissan Hardbody
Thanks: 56
Thanked 722 Times in 680 Posts
Default

My oil pressure at idle when engine is warm is right about 10-12 psi on autometer mechanical gauge, do you think using one washer would help? Also you just remove the large nut and as you said some oil and the spring will come out, nothing else right?
__________________
My name is Tony and I'm a Infamousaholic

Current truck - 1993 Nissan Hardbody king cab 2wd
, (formerly owned: 90 Nissan Sentra, 94 Nissan Pathfinder SE 4x4, 05 Nissan Titan, 87 Nissan SE-V6 4x4 king cab, 94 Infiniti Q45t & 80 Datsun 310GX )
ahardb0dy is offline   Reply With Quote
Old 09-16-2016, 06:00 PM   #9
Foul_Mouth
Infamous Autocrosser
 
Foul_Mouth's Avatar
 
Join Date: Mar 2010
Location: Western NY
Posts: 3,395
Vehicle: 1986.5 4WD Reg Cab/ 1991 2WD Reg Cab(Red)/ 1995 2WD Reg Cab(Green)/ 1992 WD21 4WD PathFinder
Thanks: 257
Thanked 463 Times in 373 Posts
Default

Correct on removing the big bolt, there will be oil and two springs that greet you. 10-12psi @ idle is pretty spot-on for a stock KA. With the washer I am at 15psi @ idle. Where are you for psi at 4000RPM?
__________________
Nissan Truck Videos (Builds-Racing-Shows-Tech)
https://www.youtube.com/c/NissanTruckguy








Foul_Mouth is offline   Reply With Quote
Old 09-17-2016, 01:46 AM   #10
ahardb0dy
The Post Count Whore
 
Join Date: May 2014
Location: Sorrento, Florida
Age: 51
Posts: 6,638
Vehicle: 1993 Nissan Hardbody
Thanks: 56
Thanked 722 Times in 680 Posts
Default

Today at 3200 it was about 40 I believe. Having an idle issue right now, going to try some stuff tomorrow but the oil pressure has been going below 10 (idle as low as 200, truck stalled the other day on me)

Only see 1 spring in the diagram in the FSM
__________________
My name is Tony and I'm a Infamousaholic

Current truck - 1993 Nissan Hardbody king cab 2wd
, (formerly owned: 90 Nissan Sentra, 94 Nissan Pathfinder SE 4x4, 05 Nissan Titan, 87 Nissan SE-V6 4x4 king cab, 94 Infiniti Q45t & 80 Datsun 310GX )
ahardb0dy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 04:48 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.