Rb26 Sump Options

[N1GTR]

Hey guys

Im building a motor for my GTR currently, and the issue of oil control has come up.

So far its got a gated sump baffle and the tomei head restrictor, but after speaking to one of my mechanic mates he was saying the JUN pump will empty an rb26 OEM sump pretty fast - so what are the current options/things people are doing to overcome this?

Cheers

[GeeTR]

SK's Oil Control Thread

couldn't resist, theres a lot of info on the topic.

[STR8E180]

this is the sump which hi octane sell

if i was going threw a rebuild this would be the sump i would be using

[GeeTR]

Low hung sumps scare me, like a bull walking through a corn field

[James_03]

^^^ have to agree with that.

looks quality but hey.

[STR8E180]

road to sump clearance with that sump is the same as standard

Edited December 7, 2007 by STR8E180

[James_03]

serious it looks way deeper in those pics.

sounds like they might be the way to go then.

[Blitz]

For the money, the Trust extension is a very good choice.

Baffle cylinder, modified pickup and increased capacity.

On the other hand, if your budget permits, I too would go for the Performance Metalcraft option.

[R31Nismoid]

Whats the setup Steve-o?

I'd either be using a stock sump +1ltr.

Or a Racepace one - tried, tested, proven

[Swiper the Fox]

id go for a performance metalcraft sump....ive launched quite a few times with one harder than most (2nd hardest in aust) and would throughly recommend one.

[STR8E180]

the Mspeed R34 GTR over in japan is still using a standard sump

freaky aye lol

[N1GTR]

SK's Oil Control Thread

couldn't resist, theres a lot of info on the topic.

Yep thanks ive read most of that

road to sump clearance with that sump is the same as standard

Cheers for the pics, that thing looks VERY deep

For the money, the Trust extension is a very good choice.

Baffle cylinder, modified pickup and increased capacity.

On the other hand, if your budget permits, I too would go for the Performance Metalcraft option.

Cheers

Whats the setup Steve-o?

I'd either be using a stock sump +1ltr.

Or a Racepace one - tried, tested, proven

Setup is basically:

RB30

N1 or JUN pump (got the cash here ready to buy either one - long story)

SPOOL rods

CP pistons

tomei head restrictor

cam baffles

oil feed from back of head to sump

currently has gated sump baffles in OEM sump

The car is mainly for hill runs (high G cornering)

id go for a performance metalcraft sump....ive launched quite a few times with one harder than most (2nd hardest in aust) and would throughly recommend one.

Is that what you have on there now?

[GeeTR]

- Oil feed from back of head to sump

Just to clarrify, if a JUN pump can drain a normal sump, and you have the big ole -10 from head -> sump;

Where is the oil supposed to be draining to?

Edited December 7, 2007 by GeeTR

[N1GTR]

Just to clarrify, if a JUN pump can drain a normal sump, and you have the big ole -10 from head -> sump;

Where is the oil supposed to be draining to?

Sorry, shouldve been more specific: Those parts are all ready to go, its just a matter of choosing a sump and the right combination of the other parts to go withit

[GeeTR]

Gotcha!

[Duncan]

I've got no direct experience with the JUN pump....but why would you want to put in a pump that flows *more* than standard.

the base of the oil control problems in rb26 is that the standard pump flows too much at high revs.

n1 oil pump flows less oil for the same revs.

I understood JUN pump flows same as n1 but doesn't explode the first time you launch hard like an n1 pump does?

Anyway, on sumps, I run the trust extension - have used it at Targa and on the circuit and have never touched it, it hangs about 1cm below the subframe. This includes twice breaking the front suspension and going off road, but still no damage. Also no oil surge even on the long high g corners which is handy.

[Blitz]

I've got no direct experience with the JUN pump....but why would you want to put in a pump that flows *more* than standard.

the base of the oil control problems in rb26 is that the standard pump flows too much at high revs.

n1 oil pump flows less oil for the same revs.

I understood JUN pump flows same as n1 but doesn't explode the first time you launch hard like an n1 pump does?

Anyway, on sumps, I run the trust extension - have used it at Targa and on the circuit and have never touched it, it hangs about 1cm below the subframe. This includes twice breaking the front suspension and going off road, but still no damage. Also no oil surge even on the long high g corners which is handy.

Duncan, the JUN pump flows significantly more than the N1 pump, thus its reputation for quickly emptying a stock sump.

JUN pumps are best used with a large capacity sump, or a stock unit modified with an extension like the Trust.

For what its worth, I currently also run the Trust Sump, along with the JUN pump.

[Blitz]

FYI (Straight from the JUN website)

JUN'S OIL PUMP for RB engine

RPM OULET[l/min]

STD JUN'S

600 4.4 5.5

2,000 15.2 19.5

6,000 46.7 58.9

[Duncan]

jesus 20% more than standard. you would be mad to run one of these without head oil feed restrictors and an big external drain.

[Godzilla32]

Im using the standard oil pump over N1. The N1 has a layered gearset which makes it more prone to cracking from vibrations caused by hitting the rev limiter hard with big power. Not an upgrade in my mind at all. I have fitted a JUN sump baffle to stop surge and plan to perhaps just over fill for track work. As far as 20% more flow goes with a JUN pump, im not sure thats really necessary. Providing you have good constant oil film pressure to the bearings and head whats the advantange of higher flow. I think the biggest gain with a Tomei or JUN pump is the billet gearset which is very strong and has a higher resistance to cracking. However $1200 for a 2nd hand Tomei pump was just getting too much. One of those oversize sumps would be nice but unless your going to be running times like the best of them, im not sure they're necessary either.

Deren