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Rb26dett - 2860-5 - Fueling Options

Adam Kindness
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Adam Kindness Contributor

Adam Kindness

Posted
Posted

First of all.... Hello from Scotland :P

The engine is currently out of my R32 GTR getting new OS Giken pistons, new bearings, sump baffle, rod bolts and GT2860-5's

I intented to run the car for a while at low boost on std injectors/pump/AFM's but with tomei FPR. I know this isnt the most ideal plan, but there are more important things going on just now. I'll run them at 0.8 to 1bar but will get the car on a dyno to make sure everything is fine.

So... my real question is...

What do i really need to run these turbo's at say 1.6 bar max?

Will 1 intank Tomei 276lph pump, Nismo AFM's and 700cc injectors .... mapped with PFC be ok?

or.... is it best to just overkill it with twin intanks feeding a dual entry rail, uprated lines and bigger injectors?

What is the max boost, usuable/efficiency, on the GT2860-5's?

ta ;)

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Will 1 intank Tomei 276lph pump, Nismo AFM's and 700cc injectors .... mapped with PFC be ok?

should be fine, worst case you need a bigger pump, just keep the tomei and use it as a lifter.

dont need dual entry rails etc etc.

overkill :P

Gav Mentor

Gav

Posted
Posted
First of all.... Hello from Scotland :dry:

The engine is currently out of my R32 GTR getting new OS Giken pistons, new bearings, sump baffle, rod bolts and GT2860-5's

I intented to run the car for a while at low boost on std injectors/pump/AFM's but with tomei FPR. I know this isnt the most ideal plan, but there are more important things going on just now. I'll run them at 0.8 to 1bar but will get the car on a dyno to make sure everything is fine.

So... my real question is...

What do i really need to run these turbo's at say 1.6 bar max?

Will 1 intank Tomei 276lph pump, Nismo AFM's and 700cc injectors .... mapped with PFC be ok?

or.... is it best to just overkill it with twin intanks feeding a dual entry rail, uprated lines and bigger injectors?

What is the max boost, usuable/efficiency, on the GT2860-5's?

ta :(

As you have said - get it on the dyno after you fit the terbs and the FPR to see what the AFRs are at peak load and boost.

Also very helpful if the dyno operator has a fuel flow meter to check what the flow is back to the fuel tank at these peak loads - if your fuel pump is original the performance may be down significantly.

Opinions vary considerably as to when you need to add additional pumps in series, however I'm running a 2.8L with twin GT-RS terbs and have sufficient flow with a single Nismo (drop in replacement) fuel pump with a dedicated power feed.

Beer Baron Grand Master

Beer Baron

Posted
Posted

if it were me I would go with the following:

nismo pump in tank

sard 700cc injectors

sard reg (mainly so you can plug a fuel pressure sensor into the side of it)

direct power feed to the pump is a wise idea too

away you go :dry:

noone Experienced

noone

Posted
Posted

Beer baron do the sard 700cc injectors need collars or no was looking at doing either exactly the same as you are suggesting or going all nismo including the 600cc injectors. I thought u could attach a pressure sender to the nismo reg too, am I wrong there.

Do you think they would be capable of providing fuel for such a setup or possibly to small was only looking at gt-ss myself.

yeh I know this is probly covered elsewhere but it seemed somewhat relevant to this discussion

Beer Baron Grand Master

Beer Baron

Posted
Posted
Beer baron do the sard 700cc injectors need collars or no was looking at doing either exactly the same as you are suggesting or going all nismo including the 600cc injectors. I thought u could attach a pressure sender to the nismo reg too, am I wrong there.

Do you think they would be capable of providing fuel for such a setup or possibly to small was only looking at gt-ss myself.

yeh I know this is probly covered elsewhere but it seemed somewhat relevant to this discussion

there is no gauge port on the side of the nismo reg. if you just want to temporarily attach a gauge for set-up you just need to t in. no big deal. but if you want an elec fuel pressure gauge (i do) get the sard reg as it has a gauge port on the side.

sard 700cc for RB26 injectors do not require collars.

700cc injectors and a nismo pump will happily supply 700 engine horsepower. for the approx 300awkw that the GTSS will give they are fine. some would even say overkill. Plus the 700cc sards are well under $700 for a set of 6 so damn good value.

noone Experienced

noone

Posted
Posted (edited)

Yeah thanks B.Baron I thought it was slight overkill but all good an yes Sard injectors seem a definite bargain, huh!

The sard reg might be the go was seriously thinking bout a fuel pressure guage (in car) so maybe

Would a stock reg be maxed out trying to feed 700cc injectors, dont wanna skimp on fuel supply just wondering for couple a hundred for new reg probly not worth the risk anyway

Edited by noone

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