N1 oilpump VS Jun oilpump! - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

TP_ · 27th March 2008, 04:29 PM

hello!

I stand between an N1 oilpump and Jun oilpump, what have you to say about my choice? The Jun pump costs for me at least 400 dollars more and would make my car stand 1 extra month before i can start it up.

Regards/ Mattias from Sweden

Listerofsmeg · 27th March 2008, 04:34 PM

Jun over N1 every time.....the N1 isnt much (if any) better than stock.

Spearmint · 27th March 2008, 04:43 PM

N1's don't like many revs above 8000rpm.

Jun / Tomei everytime.

kismetcapitan · 27th March 2008, 11:07 PM

I've broken both, so I'd say neither. However, when the JUN broke, it was just a hairline crack that leaked a bit of oil, and still delivered full oil pressure under some extreme driving.

When the N1 broke, it shattered into bits. I was parking the car when it happened. N1 is garbage.

Buy a Tomei or Reimax.

rogerdavis · 28th March 2008, 12:03 AM

What about the Nismo one? whats the difference between that and the N1?

kismetcapitan · 28th March 2008, 05:52 AM

Nismo is stronger but flows the same as stock. The JUN flows a lot. A LOT. This is good, but also not so good. If you have ball-bearing turbos, the oil lines must have restrictors or the high oil pressure that the JUN pump generates will blow the bearing seals. The JUN can also suck a standard sump dry if the level is a little low.

Tomei has adjustable flow, which is why I bought one of those. I think overall, an extremely high-flowing pump has advantages over the disadvantages, but you really have to prep your engine for it. head oil restrictor. turbo oil restrictors. sump control/extended sump. And an oil catch tank - at high RPM there's so much oil being flung into the head that if you keep the crankcase vent connected to the intakes, you'll be burning oil, which is like dropping your octane 50 points when on boost. And who wants to run 50 octane fuel when you're boosting???? head oil drain - I haven't done it but some others have. Some say it's necessary, some think it's pointless. I don't know, other that it's something to consider.

A Tomei pump set to maximum flows about the same as a JUN, maybe slightly less. I ran 0W-20 oil for four months, and I think that the big flow of the JUN pump let me get away with that, maintaining pressure with water-thin oil.

NBM33 · 28th March 2008, 05:58 AM

Quote:

Originally Posted by Spearmint

N1's don't like many revs above 8000rpm.

Jun / Tomei everytime.

I Agree Richie...I had a New N1 oil pump fail , It totaled my Engine

greyBnr32 · 31st March 2008, 07:06 AM

so if I am not planning to go over 8k an N1 should be better than the tired original one, or just buy a new original oil pump.

kismetcapitan · 31st March 2008, 07:21 AM

you could, but that's a part of the engine I'd rather not be cheap on, least of all because you have to remove the engine to change it.

Tomei or Reimax. They have the strongest gears, which is really what you want to be concerned about.

RomEG6 · 1st April 2008, 12:11 AM

Quote:

Originally Posted by kismetcapitan

you could, but that's a part of the engine I'd rather not be cheap on, least of all because you have to remove the engine to change it.

Tomei or Reimax. They have the strongest gears, which is really what you want to be concerned about.

well said

TP_ · 1st April 2008, 04:44 AM

I cant find Reimax anywhere on the net, but iv'e found some Greddy pumps. How are they then?

Mr. Keets · 1st April 2008, 05:36 AM

Reimax

I thought about the Tomei/Jun/N1 selection and I'm convinced that the way to go is the N1 with the Reimax gears. They flow the same as an N1 but have greater strength and as stated above the Jun/Tomei ones flow alot more leading to the possibility of sucking a sump standard sump dry at high rpm. There is a great thread on the SAU site regarding oil control. Oil Control In Rb's For Circuit Drag Or Drift - Skylines Australia

gibson · 1st April 2008, 06:36 PM

oil pumps like everything on all engines comes down to the supporting items. Meaning the crank and vibrations from it ...how many of your failures had ATI dampers or similar. Cranks, rods pins and clutch balancing?? look at the big picture.. Mine is N1

rockabilly · 1st April 2008, 07:41 PM

had 2 x n1,s on my rb26 620bhp 4000miles no probs 8000 limit all balanced, one on my rb26/30 all balanced 8000 limit done 1200 miles so far no issues, its vibration that kills them simple..get it balanced properly. bernie

TP_ · 2nd April 2008, 04:14 AM

My clutch, crank, damper are balanced. My Verdi rods and CP pistons are weight adjusted too.

After that i read the Australian thread about oilcontrol, it feels like the best way is to use the N1 pump and buy Reimax gears. Someone knows where to buy the except for Greenline.jp? People here in Sweden have had alot of problems with greenline.

27th March 2008, 04:29 PM	#1 (permalink)
TP_ GTR Register Member Join Date: Jan 2008 Location: Sweden Posts: 41	N1 oilpump VS Jun oilpump! hello! I stand between an N1 oilpump and Jun oilpump, what have you to say about my choice? The Jun pump costs for me at least 400 dollars more and would make my car stand 1 extra month before i can start it up. Regards/ Mattias from Sweden

27th March 2008, 04:34 PM	#2 (permalink)
Listerofsmeg GTROC Member Join Date: Jul 2006 Location: Shefford, Beds Posts: 1,717	Jun over N1 every time.....the N1 isnt much (if any) better than stock. __________________ White R33 GTR Its working!! 10.908 @ 128mph on pump fuel and full trim!

28th March 2008, 05:52 AM	#6 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,397	Nismo is stronger but flows the same as stock. The JUN flows a lot. A LOT. This is good, but also not so good. If you have ball-bearing turbos, the oil lines must have restrictors or the high oil pressure that the JUN pump generates will blow the bearing seals. The JUN can also suck a standard sump dry if the level is a little low. Tomei has adjustable flow, which is why I bought one of those. I think overall, an extremely high-flowing pump has advantages over the disadvantages, but you really have to prep your engine for it. head oil restrictor. turbo oil restrictors. sump control/extended sump. And an oil catch tank - at high RPM there's so much oil being flung into the head that if you keep the crankcase vent connected to the intakes, you'll be burning oil, which is like dropping your octane 50 points when on boost. And who wants to run 50 octane fuel when you're boosting???? head oil drain - I haven't done it but some others have. Some say it's necessary, some think it's pointless. I don't know, other that it's something to consider. A Tomei pump set to maximum flows about the same as a JUN, maybe slightly less. I ran 0W-20 oil for four months, and I think that the big flow of the JUN pump let me get away with that, maintaining pressure with water-thin oil. Last edited by kismetcapitan; 28th March 2008 at 05:55 AM.

1st April 2008, 07:41 PM	#14 (permalink)
rockabilly rb30 710bhp Join Date: Oct 2003 Location: lancashire Posts: 1,049	had 2 x n1,s on my rb26 620bhp 4000miles no probs 8000 limit all balanced, one on my rb26/30 all balanced 8000 limit done 1200 miles so far no issues, its vibration that kills them simple..get it balanced properly. bernie __________________ fancy the south of france. http://st-tropez.mysite.orange.co.uk/

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27th March 2008, 04:43 PM	#3 (permalink)
Spearmint GTR Register Member Join Date: Aug 2005 Location: Northamptonshire Posts: 799	N1's don't like many revs above 8000rpm. Jun / Tomei everytime.

27th March 2008, 11:07 PM	#4 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,397	I've broken both, so I'd say neither. However, when the JUN broke, it was just a hairline crack that leaked a bit of oil, and still delivered full oil pressure under some extreme driving. When the N1 broke, it shattered into bits. I was parking the car when it happened. N1 is garbage. Buy a Tomei or Reimax.

28th March 2008, 12:03 AM	#5 (permalink)
rogerdavis GTR Register Member Join Date: Feb 2008 Posts: 154	What about the Nismo one? whats the difference between that and the N1?

31st March 2008, 07:06 AM	#8 (permalink)
greyBnr32 GTR Register Member Join Date: Aug 2006 Posts: 133	so if I am not planning to go over 8k an N1 should be better than the tired original one, or just buy a new original oil pump.

31st March 2008, 07:21 AM	#9 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,397	you could, but that's a part of the engine I'd rather not be cheap on, least of all because you have to remove the engine to change it. Tomei or Reimax. They have the strongest gears, which is really what you want to be concerned about.

1st April 2008, 04:44 AM	#11 (permalink)
TP_ GTR Register Member Join Date: Jan 2008 Location: Sweden Posts: 41	I cant find Reimax anywhere on the net, but iv'e found some Greddy pumps. How are they then?

1st April 2008, 05:36 AM	#12 (permalink)
Mr. Keets GTR Register Member Join Date: Jan 2006 Location: Sunny Shinyanga Posts: 163	Reimax I thought about the Tomei/Jun/N1 selection and I'm convinced that the way to go is the N1 with the Reimax gears. They flow the same as an N1 but have greater strength and as stated above the Jun/Tomei ones flow alot more leading to the possibility of sucking a sump standard sump dry at high rpm. There is a great thread on the SAU site regarding oil control. Oil Control In Rb's For Circuit Drag Or Drift - Skylines Australia

1st April 2008, 06:36 PM	#13 (permalink)
gibson GTR Register Member Join Date: Feb 2005 Location: hertfordshire Posts: 428	oil pumps like everything on all engines comes down to the supporting items. Meaning the crank and vibrations from it ...how many of your failures had ATI dampers or similar. Cranks, rods pins and clutch balancing?? look at the big picture.. Mine is N1

2nd April 2008, 04:14 AM	#15 (permalink)
TP_ GTR Register Member Join Date: Jan 2008 Location: Sweden Posts: 41	My clutch, crank, damper are balanced. My Verdi rods and CP pistons are weight adjusted too. After that i read the Australian thread about oilcontrol, it feels like the best way is to use the N1 pump and buy Reimax gears. Someone knows where to buy the except for Greenline.jp? People here in Sweden have had alot of problems with greenline.