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Nismo Fine Spec Motor - Upgrade Oil Pump Or Leave Alone?

GSX-R35

By GSX-R35,
in Engines & Forced Induction

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GSX-R35 Community Regular

GSX-R35

Posted
Posted

Hello everyone. I'm having a tough time making a decision on some parts for my R32's build and was hoping for some guidance. My Nismo R32 decided to develop engine trouble a couple of months ago and I was able to pick up a new Nismo RB26 Fine Spec Final Edition longblock to replace the old tired mill. I'm now in the process of accumulating appropriate supporting parts for it. My ultimate goal is to have a reliable setup with a bit more power. I'm not aiming for a lot of added oomph - I'd be overjoyed if I could have 500 crank hp but my foremost priority is reliability so I was pondering what to do about the oil pump.

The Fine Spec comes with a Nismo oil baffle but the oil pump is just an N1. From my research the N1 is only slightly better than the stock pump - just upping the oil pressure a bit more but flow is the same. People kept telling me to get a Tomei and although the price had me balking at first I eventually thought I'd bite the bullet to ensure as much reliability as possible. But then further reading online has me seeing people saying the Tomei is not a foolproof solution because you can run the sump dry if you don't have a higher capacity one. I don't have plans to upgrade the sump at this time.

This car will mainly be a weekend driver/show car. I might take it to the track once or twice just to give it a go but that'll be it since I have other cars for regular track duty. So I'm left with the dilemma - while the engine is still out should I upgrade the oil pump to a Tomei knowing that's supposed to be the best out there? Should I leave it alone knowing it'll mainly be driven on the street with only the occasional spirited driving? Or should I adopt a middle solution and maybe get a Nismo oil pump that is slightly higher flow than the N1 and with stronger gears for less money (but not as high flow or as strong gears as the Tomei)?

Thanks in advance for your help.

Hadouken Grand Master

Hadouken

Posted
Posted

If you are worried about the pump then put reimax gears in it, that will be more than enough.

If you want to properly address the oil control issues of your motor then I suggest you start reading the 100's of pages in the rb oil control thread.

GTRPSI Mentor

GTRPSI

Posted
Posted

Tomei oil pump, 1.2mm oil restrictor, increased capacity sump and a oil breather fitting on the sump above oil level.

This is assuming you have a long nose collar (or a 33/34 crank) fitted already.....if you dont, watch out whatever pump you fit.

  • Like 1
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

I should think it would be fine with the factory fitted N1 pump. There was a time when some N1 pumps failed. It could be because there were some knock offs on the market for a while but my N1 pump has been fine (although I don't limiter bash).

  • Like 1
GSX-R35 Community Regular

GSX-R35

Posted
  • Author
Posted

If you are worried about the pump then put reimax gears in it, that will be more than enough.

If you want to properly address the oil control issues of your motor then I suggest you start reading the 100's of pages in the rb oil control thread.

Thanks for the input. I've been reading a lot of stuff on the RB's oiling issues already and that's why I was undecided since most of the stuff that's written seems focused on cars expected to see heavy use - not a car like mine that will be mostly street driven and rarely see a track. After talking to a guy with a lot of RB experience including crew chief on an N1-spec race car and has tried the different solutions out there including the Tomei I'm probably going to go with the Nismo oil pump - it's better than the N1 but not overkill for my needs.

Tomei oil pump, 1.2mm oil restrictor, increased capacity sump and a oil breather fitting on the sump above oil level.

This is assuming you have a long nose collar (or a 33/34 crank) fitted already.....if you dont, watch out whatever pump you fit.

As I said, the motor I have is a Nismo Fine Spec so it already has a later-spec crank and tighter oil restrictors. My main question was whether the Tomei pump would be okay to use without going to an increased capacity sump.

I should think it would be fine with the factory fitted N1 pump. There was a time when some N1 pumps failed. It could be because there were some knock offs on the market for a while but my N1 pump has been fine (although I don't limiter bash).

Thanks for the input. Limiter bashing and heavy use seem to be the main reason for pump failures from what I keep reading. Although the N1 pump is probably okay for the low-stress use I plan for my car, the expert I consulted recommended at least going with Reimax gears in the N1 pump for more insurance. I'll probably go with a Nismo pump though since it's not too much more after factoring in labor to do the gear swap and reinstall.

Stixbnr32 Rising Star

Stixbnr32

Posted
Posted (edited)

Seen this time and time again.

Stop wasting your time go Tomei pump and spend $500 or less to get the sump extended.

End of all your worries/questioning the setup.

Do not forget any engine that gets limiter bashed can fail - its a fools activity.

Edited by Stixbnr32
  • Like 1
GSX-R35 Community Regular

GSX-R35

Posted
  • Author
Posted

Seen this time and time again.

Stop wasting your time go Tomei pump and spend $500 or less to get the sump extended.

End of all your worries/questioning the setup.

Do not forget any engine that gets limiter bashed can fail - its a fools activity.

I'm in the US, not Oz so AFAIK there is no way to get an extended sump for that cheap around here. Cheapest option I've seen is the Trust extension kit but that's 400 bucks plus welding and the design looks bad for a street car since it hangs so low and the drain plug sticks out. If you have a good option for where to get the sump extended that won't cost an arm, a leg, and my left testicle I'm happy to hear it.

GTRPSI Mentor

GTRPSI

Posted
Posted

I wouldn't dream of running any high volume oil pump without a larger sump and smaller restrictor.

If your planning to run the engine at lowish RPM's and small short highish RPM's on the rare occasion your fine as you are.

Personally i cannot fathom why someone would question a higher capacity oil sump when knowing the oiling issues RB's have and cost of a rebuild, especially while the engine is still out......

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

^ agreed. You wanna go Tomei pump, you wanna go a baffled/extended sump. Not just a tomei sump baffle like some think (band aid), but a full/proper sump upgrade.

You suck it dry, which is highly likely with a Tomei pump even with restrictors, depending on how it's been put together and the PCV etc... They you've just lunched a motor.

Different story if playing with N1 pumps/gears. Could get away with just baffling and overfilling by 1L

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

I have an N1 pump with baffled stock sump, 2 x 1.0mm restrictors and sump breathers making 420awhp and 7000 revs.

However if you decide on a Tomei pump it can empty your sump and quite a few Racefab sumps have found their way to the US. All the info is on the website:

http://racefab.co.nz/sumps.html

The price is half that of a Tomei pump and a small fraction of the cost of a rebuild.

GSX-R35 Community Regular

GSX-R35

Posted
  • Author
Posted

How much was that motor? How much is the sump extension?

The motor was an arm, a leg, and my right testicle which is why I'd like not to lose my left one for a sump because I might still need it for the good of the species. As for the sump extension, I dunno how much, they aren't readily available here in the US like I said and everyone seems to keep banging on about getting one but don't offer concrete info on a good place to get one.

I wouldn't dream of running any high volume oil pump without a larger sump and smaller restrictor.

If your planning to run the engine at lowish RPM's and small short highish RPM's on the rare occasion your fine as you are.

Personally i cannot fathom why someone would question a higher capacity oil sump when knowing the oiling issues RB's have and cost of a rebuild, especially while the engine is still out......

I never said I questioned the virtues of a high capacity oil sump. The problem is availability here in the US as I've pointed out but seems to be repeatedly ignored.

^ agreed. You wanna go Tomei pump, you wanna go a baffled/extended sump. Not just a tomei sump baffle like some think (band aid), but a full/proper sump upgrade.

You suck it dry, which is highly likely with a Tomei pump even with restrictors, depending on how it's been put together and the PCV etc... They you've just lunched a motor.

Different story if playing with N1 pumps/gears. Could get away with just baffling and overfilling by 1L

Thank you for actually responding to my main question. That's why I'm looking at the Nismo pump versus the Tomei. However if someone could get around to pointing out a cost-effective sump extension solution then that could be a different story.

I have an N1 pump with baffled stock sump, 2 x 1.0mm restrictors and sump breathers making 420awhp and 7000 revs.

However if you decide on a Tomei pump it can empty your sump and quite a few Racefab sumps have found their way to the US. All the info is on the website:

http://racefab.co.nz/sumps.html

The price is half that of a Tomei pump and a small fraction of the cost of a rebuild.

THANK YOU! Finally, someone gave me a lead to where I can possibly get a sump extension instead of just assuming here in good old Obamaland I can just ask the bum on the street corner what he uses for his personal race car. Much obliged, I've got an email in to Racefab now! :cheers:

  • 3 weeks later...
GSX-R35 Community Regular

GSX-R35

Posted
  • Author
Posted

I have an N1 pump with baffled stock sump, 2 x 1.0mm restrictors and sump breathers making 420awhp and 7000 revs.

However if you decide on a Tomei pump it can empty your sump and quite a few Racefab sumps have found their way to the US. All the info is on the website:

http://racefab.co.nz/sumps.html

The price is half that of a Tomei pump and a small fraction of the cost of a rebuild.

Just wanted to update this thread and say thanks to KiwiRS4T for being so helpful. I got in touch with Racefab and will be ordering an extended sump from them so I can run the Tomei pump.

  • Like 1
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

People probably got a little confused - you keep saying sump extension. That usually means the shitty Trust one

http://millennium-motorsports.com/store/index.php?main_page=product_info&cPath=266_1_101_130_132&products_id=82

Which isn't really a proper high volume extended/baffled sump at all.

PLENTY of places make high volume/baffle jobs

High Octane

Racepace Motorsport

Racefab (as you've seen)

There are LOADS of places you could purchase from :)

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