Progress report

[Revhead]

The only mods I have on my engine are 3" exhaust, pod, wastegate bleed, T3/4 turbo and PowerFC, currently still running the base map. I have a FMIC 'almost' bolted up, but for now the stocker is still in place.

Even with the crappy stock intercooler in place, on 10psi pretty much everything is maxed out. The injectors are on 100.0%, the AFM is reading 5.1V (it's only meant to go to 5V I believe), and this is at almost 1000rpm short of the rev limit. So I'm up for bigger injectors and fuel pump/s (might as well do it properly the first time around), another AFM, and I'm wondering about the longevity of the stock bottom end (seems OK but has done an indicated 170,000km, probably more).

Anyway, next stage is getting the bigger squirters etc, then bolting up an RB30 block. I have a VL turbo bottom end sitting in the workshop with 5 good forgies and one scored bore... so for a minimal outlay (one matching forgie, some machine work and fresh rings and bearings to be safe) I'll have an RB30DET. Sweet.

Anyway, enough from me, just thought it might be of interest

[avalonea]

is it a ball bering turbo ?

stock zorst manafold ?

internal gate ?

how much power are you putting out on 10psi ?

sounds intersting

i just only compleated a rb30 with a rb25 head. very happy with the low down tourqe , definatly a good upgrade in your case, the rb30 bottom end can handle a fair bit of punishment, only recomendation i would have is that you invest in a new bottom end cradle

`josh

[Revhead]

Thanks for the advice, I'll check it out When you say new, do you mean new stock, or new aftermarket?

Yep, turbo is ball bearing. It's nearly identical in construction to the stock R33 turbo except for being steel-wheeled and a damn sight bigger. Yes, it's internally gated.

Have no idea how much power it's putting out, I'm just taking it easy at the moment until I get bigger injectors etc, then I'll do a power run. It's safely making more power than stock though The bum dyno tells me that, assuming ~300hp at the engine before, conservatively it'd have to be making 350+ at the moment, on less boost than previously. Don't really know for sure, but I'll let you know once it's been dyno'd.

[avalonea]

i ment a aftermarket cradle.

i have been told by a decent workshop they have had problems with the stock rb30 cradle due to the twincam head harmonics. im looking at a nizpro cradle apparently that does the job well

i havent had the problem my self. but im fitting a new head to my rb30 so i thought i might as well do the cradle as well,

injectors at full cycle means decent power. well you would wanna think so ~

just memba. dont get injectors that are beyond your power goal larger injectors become a paint at lower revs

`josh

[predator]

You are still running the stock default map??

Well no wonder its maxing everything out! as the stock map for the PFC is just designed for the stock turbo.. Amongst other things that the PFC will be controlling is ignition timings, injector pulse, fuel intake, etc. You really should get it all tuned *before* you start lashing out for new injectors, new fuel pump, etc.

my 2c.

[Revhead]

avalonea

Thanks for the info - if you could let me know price etc that'd be excellent

predator

Thanks for your input.

OK, here's how I see things - and tell me if I'm wrong, which I probably am

The turbo shouldn't change 'too' much how the ECU runs the car, the AFM still tells it how much air it's getting. The AFM is maxing out purely due to the amount of airflow through it, which has nothing to do with the ECU. The ECU just reads the value and uses it in its calculations. I'm not using a MAP sensor so the AFM should still be accurate (until it maxes out).

As for the injectors maxing out, I have absolutely no idea whether there are more variables involved than a 3D map (TPS, AFM, RPM) - perhaps the PFC is picking up much greater airflow, reading less boost than it expects, and pumping fuel in? Dunno, but I can tell it's running far from optimally. Either way I'll take your advice and get it tuned once I've got the FMIC on (hopefully that should be done in the next couple of days), that should ease my paranoia a bit, but I'll definitely be needing bigger injectors/pump/afm anyway due to RB30 plans. Hopefully I'll get some more midrange... :burnout:

[hungry6]

U have a nice flat spot at about 3750-5000 rpm? atm? if the answer is yes then. you are ready for the next stage of mods, which includes

1 650x350x125 FMIC

1 6X 800CC INJECTORS

1 CUSTOM MANIFOLD

1 4" EXHAUST

1 TRUST T78

1 55MM EX. WASTEGATE

1 EBC

1 044 FUEL PUMP

1 FUEL REG.

1 SET OF STOCK GTR BOV

1 NEW CLUTCH

1 GOOD ECU TUNE

1 NEW SET OF UNDIES

This should get rid of that flat spot for you

[predator]

perhaps the PFC is picking up much greater airflow, reading less boost than it expects, and pumping fuel in?

If you think about it, its probably getting more air from your t3/t4 than it expects, therefore dumping more fuel it to keep it all nice and safe. And I've heard the PFC goes for "safety first" with its default map, so that it runs richer than necessary to protect your engine. After all, Apexi would figure the stock map needs to cope with big turbos, etc at least to get you to the tuning shop.

Really depends how much power you're actually putting out atm, but my guess is it just needs tuning before you're really going to know the exact point your AFM and/or injectors max out. But you're definitely right, if you're going for the big power you're gonna need all the mojo very soon

[Mase]

You forgot one thing hungry 6

1 VERY GOOD LOOKING NYMPHO FOR THE PASSENGER'S SEAT

That just about sums it up i think?

On a serious note, i'd be getting it to a dyno shop very quickly if i were you. Don't go out and buy anything just yet. Im sure the dyno place would be more than willing to tell you what you need and they'd be even more willing to sell it to you!!

[chaos]

u fixed that wear and tear on the front left guard yet marc

[Revhead]

Hehe yeah pretty much - I've completely pulled out the inner guard, and I'm in the process of fabricating a new one. I've also relocated the wiring loom further out of the way. All up it gives me an extra ~1.5" of wheel travel before it hits anything, which is more than enough. btw it's the front right

hungry6, I wasn't going to stuff around with piddly little undersized things like the T78. My mate's cousin's uncle's mum reckons I could get two Y2Ks spooling at 1500rpm by using an adjustable cam gear and a Brock Polariser. Is this true? She also said that, with the extra power the car will make with the stickers I'm putting on, those turbos would become a restriction over 6000rpm - except for buying more expensive stickers, what can I do about it?

[Spook's_Skyline]

Brock Polariser

hahahah

nice work on that one brocky!

[hungry6]

Strange how life has it ways with things, for decades Ford tried and spend millions to beat the brock and holden combo, and never suceeds, the comes along a $50 bit of gear and bingo, they were almost enemies.

[ronin6]

Then along comes nissan, and embarrasses everyone