Few Questions For My Next Few Mods

[chef_stagea]

So in the past few months I've done the following to my rs4... Fmic, pod, 3" turbo back, boost control and a sift kit.

I have plans to do nisstune this month I spose. But have been thinking am I better off holding out on nisstune and doing fuel/turbo 1st??

If so, what's the best set of injectors to run, I've hears good things about s15 jdm ones..??

Fuel pump? Walbro over a Bosch sounds to be the way to go?

And turbo? Should I hiflow mine? Get a hiflowed vg30 or what?

Anything eles I'm missing?? Fuel rail isn't nessasary Is it?

Is the weakest part of my engin now going to be my unopened block?

Thanx guys

[pipster11]

So in the past few months I've done the following to my rs4... Fmic, pod, 3" turbo back, boost control and a sift kit.

I have plans to do nisstune this month I spose. But have been thinking am I better off holding out on nisstune and doing fuel/turbo 1st??

If so, what's the best set of injectors to run, I've hears good things about s15 jdm ones..??

Fuel pump? Walbro over a Bosch sounds to be the way to go?

And turbo? Should I hiflow mine? Get a hiflowed vg30 or what?

Anything eles I'm missing?? Fuel rail isn't nessasary Is it?

Is the weakest part of my engin now going to be my unopened block?

Thanx guys

s2? if not a nisstune is hard to do

i've heard go bosch over walbro

you can use xr6t injectors and space the rail a bit - only should be ~$500 and the are around 600cc i think (dunno about s15 injectors tho)

if its a s2 then highflow the stock turbo cos its got the bigger rear housing (same as r34) and good for nearly 20psi and 270rwkw

you will need a z32 for that much boost tho

block should be ok for all of that tho if the tune is good

personaly i'd do the fuel pump and nisstune asap

a tune as you are now should get you at least another 20kw and should get your fuel consumption down

then highflow

then injectors (or both at the same time)

and a retune

whats your power goal? and budget?

[streatracer]

Can you nistune an RB25? last time I checked with them they didn't make a board for 25's? could be wrong?

Also your unopened block should be good for 400hp+ with a decent tune so I wouldn't worry too much (emphasis on good tune lol)

Edited May 17, 2010 by streatracer

[KiwiRS4T]

A good tune will not be cheap so you only want to do it say twice.

Get a better fuel pump. Bosch is better than Walbro although if you are going for 300kw then an intank Walbro and exterior Bosch is a good combination.

Assuming you have an S2 get the Nistune set boost at 12psi and get a good tune.

Next stage ideally needs to be done altogether although just the turbo will be ok if money is tight but it does mean an extra tune: Highflow your present turbo and set to 1 bar (15-16psi) and retune...should give you around 220kw (or for a few hundred more get a new GT3076.

Then injectors (S15 JDM 480s -not sure if they fit the neo -or new 550s) and a Z32afm. Your stock fuel rail will be ok for well over 300kw. A good tune should give you 150 - 160+ kw depending on how good your fmic is. Your unopened block "should" take this power ok so long as it is in good nick to start with, you use a quality oil and have ensured a good fuel supply and you have a top quality tuner (this last is critical).

[chef_stagea]

Yes s2 sorry!!

I'm going to be doing things slowly slowly... I'm thinking what I'll do it just tune it once for obvious reasons...

Does any one no what Bosch fuel pump to grab, 044 or 040? I no 019?? Is too big!?

How many psi will my stock afm b good for, I don't c my self pushing over 16 psi would I?

And injectors I no the jdm s15 ones go into s1 but idk bout s2... What's needec to get the xr6t inj fitted?

I'll put my fuel pump in, save up n get hiflow or gt3076, inj and nisstune at once.. What can I hope to see power wise you rekn

[pipster11]

Can you nistune an RB25? last time I checked with them they didn't make a board for 25's? could be wrong?

Also your unopened block should be good for 400hp+ with a decent tune so I wouldn't worry too much (emphasis on good tune lol)

rb25 neo can be tuned - r34 ecu runs the show, its the r33 ecu that is untuneable

Yes s2 sorry!!

I'm going to be doing things slowly slowly... I'm thinking what I'll do it just tune it once for obvious reasons...

Does any one no what Bosch fuel pump to grab, 044 or 040? I no 019?? Is too big!?

How many psi will my stock afm b good for, I don't c my self pushing over 16 psi would I?

And injectors I no the jdm s15 ones go into s1 but idk bout s2... What's needec to get the xr6t inj fitted?

I'll put my fuel pump in, save up n get hiflow or gt3076, inj and nisstune at once.. What can I hope to see power wise you rekn

044 is an external fuel pump

040 is the same pump as an 044 but set up as an internal pump - the conversion has been covered on here heaps of times and needs a little modification but will be good for all the mods you want to do

do the fuel pump relay rewire to get a constant voltage at the pump

the afm will max out after the turbo

stock turbo is good for 12psi max

nisstune for 12psi and leave it for that, it will see you with good gains over the stock tune and you should save on fuel if you get a good tune

then save for turbo, afm, injectors (afm and injectors max out at around the same time)

then tune again and your done

[chef_stagea]

I just braught a set of teins today so I'll just slowly but myself an 040, z32, 550cc seimens inj and turbo... Wack it on and tune

pipster wars this rewire thing all bout?

[pipster11]

its in the tutorial section on here

basically run a wire from the battery directly to the fuel pump and use the existing pump wiring to switch a relay that connects the direct wire to the new pump

its more a trick for older skylines due to the current draw of the bigger pump and the older wiring

in 32's you sometimes only get 11 or 12 volts at the pump due to voltage drop across the wiring so you dont get full flow out of the pump

[Race__24]

Just a thought, maybe go for a bosch 044 and mount it in-tank and adapt the factory sock to fit. This way you won't loose any capacity due to the pump sitting higher in the tank, plus the sock will keep any large lumps of poo from getting into the pump.

[Race__24]

Oh, and hi-flowing a Neo turbo is the way to go if you're after around 260-270 rwkw. Hypergear can do them for under $1k

HyperGear

[QWK32]

the fuel pump wiring mod is also because on the stock setup a fuel pump control module steps the voltage down a bit at idle, this slows the pump down. i think the intention was to get it to run quieter during idle. this lower voltage feed will cause aftermarket pumps to fail/burn out as most of them require 12v+.

also, make sure that the seimens/deka injectors either, will plug into the neo's injector loom, or they come with a plug kit (cut original plugs off and wire into new plugs).

[chef_stagea]

QWK32.. thanx mate.

does any one know witch seimens ones im after?? has any one used them b4?

im still undecided on fuel pump... i think ill go 040... but ive heard walbro are easyer to install??

is there different ways to hiflow a turbo..?? i really do no stuff all about turbos them self lol!.. still unsure to get this hyper gear high flow

or a gt3076??... will a gt3076r fit btw??

[pipster11]

when you get a turbo high flowed they:

split housings

remove old impeller

machine housing to accept bigger turbines

fit bigger steel turbines to the core (usually by puting a new core in)

balance core/blades

put it back together

bosch are harder to fit but flow more and are generally more reliable

[KiwiRS4T]

Bosch 040 flows more will probably last longer. In either case directly wire them (at least 2 tutorials in Skyline section).

I had good results from my GCG (ball bearing) highflow but some people have had good results from hypergear which is quite a bit cheaper - have a read of the threads in the forced induction section.

Not a bad idea to save up for the lot and do it all at once (although you could do the fuel pump asap) so then you are only getting one tune. I don't know where you live but get a really good specialist tuner - not just the shop that installs the turbo etc. A good tuner can get the best out of your mods while minimising the odds of blowing up!

[darrinspencer]

There has been some good suggestions and some bad ones in this thread.

Before you go racing off buying parts. you need to set a realistic power goal and budget before you can decide what you need to upgrade. You don't want to do things twice.

I have just finished the gt3076R and siemen injectors along nistune etc. Costs run away very very quickly

Booked in for tuning this Friday. Will let you know how it goes. Good or bad.

[chef_stagea]

Darren I c your points there, I've looked into it more now, seems the 040 is too loud, so walbro it is!

Also can someone fill me in with the hiflow, y is hypergear only like 1k?

Do they all fit gt30 internals? Or are there budget ways to do it? Naturaly I'd spend the few extra dollars to get a safer more reliable turbo...

[Tangles]

siemens 550cc injectors for 400hp, or 650cc for 450hp. links as per my pm.

walbro 255lph pump for $150 fits intank. bosch 040 intank for $200 isnt that loud really.

hypergear turbos are journal bearing. for $1500 + you get into the ball-bearing Garrett range.

a GT3076r bolt-on for skyline 6-bolt housing is the way to go for 400hp. get your current stock turbo highflowed to a gt3076r

either bill at ATS marion rd, or stao at hypergear - get some quotes for a bolt-on upgrade.

horsepower inabox sells a bolton for $2250, ATS for around same price. garrett ball bearing good for 270kwaw

nismo adjustable fuel pressure regulator if you feel the need, around $150 prior to getting the nistune ecu tuning.

~ or go all out, grab a twin turbo manifold kit for the rb25 and grab 2x gtr turbo's

[horrace]

RB25 twin turbo ey, that would be cool and different

[stageaharts]

Whoah, first post for a while... good to see you are finally stepping up Adam. 040 is not loud, come for a sit in mine to check. 044 external is mega loud, or at least it is on my cousins old Supra.

Seimens - Deka injectors are easy to find (Google it) and are around $360 for the set + $40 shipping. I have seen no definitive reviews on them but for the cost they can't be beat. S15 injectors shouldn't fit yours as I believe the neo injectors have a different feed position (Top vs Side).

Highflow is the safest bet for 'official' purposes, should net you 220awkw with the auto, 3076r is a more sizable turbo and is direct bolt-on if you buy the right kit. It should get you to 260awkw easily, then you can start worrying about g/box etc (If I'm not mistaken). It is defectable though, as are all aftermarket turbos in S.A. so bear that in mind. I think there was one SAU member with an R33 skyline who ran up to 360rwkw with an ethanol tune on a 3076r, search the forums for his story under forced induction I think. 3076r is a capable turbo and not too much laggier than the stocky, should be all the way on song by 3500.

As far as highflow prices are concerned, you will pay more for BB core highflows and they are apparently easier to look after and more responsive than journal bearing cores (Has been debated as to response difference.). I would try to talk to someone who has had both to make an informed decision (Tangles?).

As everyone has said (and we have previously discussed) go with the nistune set-up being that it's an S2, and for that sake of cash flow I would wait until you have the turbo/fuel pump/injectors for the tune as each tune will cost upwards of $250 in S.A. I would spend a lot of time talking to people about where to get it tuned, as I was extremely unhappy with my experience and it wasn't cheap.

Cheers!

Edited May 18, 2010 by stageaharts

[scotty nm35]

Bosch pumps are good but the 044 is the choice, I think it still flows 200lph at 75psi and can be mounted internally.

Seimens Deka's are a great budget injector, just make sure you get the XR6 4 hole ones in 3/4 length. Im running 250awkw of E85 through 610's with no issue. (Fuel rail will be 10mm higher)

Bush bearings are great for the low noise stealth effect. They initially take a bit to get spinning but once they are... I think they support higher shaft speeds with the right oil. With the small rear housing on my rebuilt stocker, and a t04e front wheel mine makes positive boost by 2000 revs and hits 20psi by 2700. Extremely responsive for that power I think. If you get a highflow done don't go a big wheel on the rear as the stock housings wont allow that much flow anyway and all you will gain is lag.