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RB26/30 with stock GTR turbos=300awkw ???

Skyline95

By Skyline95,
in Engines & Forced Induction

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Beer Baron Grand Master

Beer Baron

Posted
Posted

well mine are currently making 253 rwkw at 14psi. so with cams, dump pipes, front pipes, aftermarket intercooler (none of which I have) and say 17psi boost I'm sure you could get 300rwkw. not for very long though...

far better off to go for some HKS GT-SS or Trust T517or8Zs that will make the power reliably. my opinion anyway.

edit: just realised you wanted all wheel kw. in that case i'd say no. don't think they will go that far. again they might, but not for long.

itbmils Proficient

itbmils

Posted
Posted

Agree – I don't think the std injectors/AFMs/turbos will push that much power

I have 293awkw from my RB26 but I have

Tomei fuel pump

SX fuel reg

R34 N1 turbos

PFC with EBC

and a bunch of the other std mods (big exhaust and dumps etc etc)

I can tell you that I am right on the limit of the std injectors and AFMs (the peak hold function on the PFC tells me so)

Also, I don't get this power until I push to 18psi (1.2bar) which is more than the std turbos will safely sustain AFAIK

I'm not sure how much difference the RB30 bottom end will make – others may be able to comment on that

StockyMcStock Proficient

StockyMcStock

Posted
Posted

the larger bottom end will make the same power more easily, but will hence require more airflow. if everything else stays the same, it will make the same power on less boost, but the old turbine wheels in the huffers still have to spin faster to supply the air ;)

if you have a couple of very large external wastegates to keep the WOT back pressure down and you run the turbos right up to their limit in terms of boost, it may make the power you're after, but again i wouldn't count on it lasting too long :)

Sydneykid Grand Master

Sydneykid

Posted
Posted
Guys,  

If i build a RB26/30 for my GTR and use the stock turbos would it get to 300awkw? and how much do the injectors and pump flow

G

1. Injectors

Rule of thumb for 85% max injector duty in a cylinder engine, injector cc's = bhp

444cc's = 444bhp

444 bhp = 331 kw

331 kw - losses ~75kw = 256 rwkw

2. Fuel Pump

This is a flow chart for a number of fuel pumps, the R33GTR fuel pump is on the table, the R32GTR fuel pump is basically the same as the 300ZX fuel pump.

flowtest-nissan.gif

As you can see from the graph, the 300ZX fuel pump is good for 225 litres per hour at 13.5 volts and 20 psi boost. To get ~13.5 volts you will need to use a relay and supply power direct from the battery. The standard wiring seems to limit it to 12 volts and I have seen as low as 10.5 volts (bad earth).

444 X 6 (cylinders) X 60 (minutes in an hour) = 160 litres per hour

So the standard R32 GTR fuel pump will supply the 6 X 444 cc injectors easily.

In fact enough for 625 cc injectors at stretch.

3. Standard turbo's 300 4wkw, an interesting question that one. It's an airflow (which is what makes power) and boost (a measure of restrictions) trade off. The ceramic turbines don't like more than 1 bar for long (hot) periods. But you might get 300 4wkw at 1 bar if you remove enough restrictions (inlet, exhaust, camshaft etc). Most certainly it will be somewhere above 265 4wkw.

Hope that was of some help:cheers:

pnblight Mentor

pnblight

Posted
Posted

JUST dont use std turbo what ever you do ,as a full motor rebuild are costly and i have seen three motors killed by failing std turbos in the last 18months. If your going to the effort to build such a motor get some turbos you can trust.

SK i love this chart as you know none believes i could be running std fuel pump on my gtr but if i have std reg and only up to 20 psi by this chart the gtr pump good for nearly 240litres per hour and is not far off match for the 700cc injectors i'm running

what bhp is that sort of flow good for?

Skyline95 Collaborator

Skyline95

Posted
  • Author
Posted

This engine is kind of a slap up as a fun car while my other engine is being built, i am using RB30 N/A pistons, standard rods, standard cams etc.

I have a set of 272 JUN cams and springs lying around will they be too big and make a big increase?

Sydneykid Grand Master

Sydneykid

Posted
Posted
JUST dont use std turbo what ever you do ,as a full motor rebuild are costly and i have seen three motors killed by failing std turbos in the last 18months. If your going to the effort to build such a motor get some turbos you can trust.

SK i love this chart as you know none believes i could be running std fuel pump on my gtr but if i have std reg and only up to 20 psi by this chart the gtr pump good for nearly 240litres per hour and is not far off match for the 700cc injectors i'm running

what bhp is that sort of flow good for?

700 cc's = 700 bhp

240 litres per hour = 666 bhp

:)

IanH Collaborator

IanH

Posted
Posted

I'm hoping for 275-300rwkw (GTT so RWD) although nearer 275rwkw is my guess with Standard Turbos at 14.5psi with the following

PowerFC

Tomei PonCam A's

550cc Inj & uprated Pump

Z32 AFM's

Apexi Filters

Full exhaust

I really want to steel internal/GT-SS but have run out of money so I'm going to run 10.5psi for day to day use until I can afford new ones.

GTR32 Rising Star

GTR32

Posted
Posted
2. Fuel Pump

This is a flow chart for a number of fuel pumps' date=' the R33GTR fuel pump is on the table, the R32GTR fuel pump is basically the same as the 300ZX fuel pump.

[img']http://img.photobucket.com/albums/v517/McChook2/flowtest-nissan.gif[/img]

As you can see from the graph, the 300ZX fuel pump is good for 225 litres per hour at 13.5 volts and 20 psi boost. To get ~13.5 volts you will need to use a relay and supply power direct from the battery. The standard wiring seems to limit it to 12 volts and I have seen as low as 10.5 volts (bad earth).

So the R33 GTR pump flows a bit more than the R32 GTR pump? I always thought they were the same but I guess not.

Thanks SK

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