Hi Guys,

I've spent the last few days reading through the whole Vortech thread and various others regarding fuelling/tuning and longevity and was after your opinions on what you think would be the best option for my set up.

My question is at the bottom if you don't want to read the whole lot.

I bought the Car already S/C'd and it's a late 2004 UK GT (DE) 14k miles with;

Vortech V2 S/C Kit - 3.33 pulley, Split-second timing, FMU and in-line pump
Autosportwiring ECU harness
Kinetix SSV Inlet Manifold
Invidia true dual exhaust
Kinetix HF Cats
Denso Iridium one-step colder plugs
JWT Oil pan spacer
Stillen Pneumatic engine damper
AEM AFR gauge

I have various dyno plots from the previous owner,
Dynapack hub dyno 370hp, 325 lbft @8psi.
Dynodynamics 380 hp, 355 lbft.
Maha dyno 400hp, 316lbft.

I feel the car is fast enough at the moment and I'm more concerned with longevity.

The Vortech kit was second hand when fitted, and to my knowledge has done around 30k now. 20k previously and 10k on my car and is running faultlessly. 'Touch wood'

I'm gonna do a couple of track days this year (nothing hardcore) so wanted to make sure it won't go BANG in the process.

I contacted my tuner who is very well respected this side of the pond and was the original fitter of the Vortech kit in 2005. He recommends the following;

"I know we can improve the torque up to a safe level for the stock 350Z motor and I am sure we can make more safe top end BHP. I do know that after remapping with the Uprev system the throttle response will be far more responsive and you get 100% throttle in every gear.

The set up we like to fit is the following

Up rated fuel pump (walbro)
larger injectors (600cc)
Return fuel system (CJM stage 0)
Uprev license and remap "


I know he is recommending the 'ideal' setup, but its getting pretty expensive.

From what I've read on here, would I be right in thinking that I could safely do without the return fuel system and just do DW600cc injectors, walbro 342 with hanger mod and the Uprev and still be very safe?

If the FP and 600cc injectors can comfortably deal with it what would be the advantage of a return fuel system anyway?

Thanks in advance.

 

The advantage of the fuel return system is CONSISTENT, worry free fuel supply pressure and volume.

In life there are a lot of things that will work... But the question is for how long will they work, and how consistently will they work. You can cut costs on a cheap t-shirt or eating fast food instead of 5 star once in a while, but are you willing to cut costs on something that risks the life of your motor?

For the ~$450 or so that you can buy a basic RFS for, it's almost a no-brainer.

My cookie cutter setup:
Walbro 255lph pump
DW600 injectors
Fuel Return (haven't decided which one, or if I'll build my own)
UTEC

 

from reading up on FI, a fuel return system is something worth investing in

 

the walbro and 600cc injectors will be a fine upgrade. using the return system would be great but start with the 600's nad walbro and that should give you plenty of fuel for the time being.

 

Cheers Guys,

If I was to just go for pump, injectors and Uprev I would remove the inline pump and SS box but would I also remove the FMU?

 

yes, remove all that crappy vortech fuel stuff.

 

Thanks Binder. I should thank you for all your useful posts I've read on the Vortech thread too.

 

no problem. i try to help when i can. sometimes it doesn't always turn out the best and sometimes it does

 

I agree completely, you'll like the Osiris tune way better, and you really won't need a RFS for stock block, if its in the budget, cool, if not, I wouldn't sweat it.

 

I agree. It's my understanding that for the stock 3.33 pulley, the basic Vortech fuel system along w/ the stock 350Z fuel lines are more than enough. Even w/ a 3.12 pulley, you'll probably be fine w/ the stock set up if you don't drag race everyday. 2.87 pulley system is a whole different thing though, you'd defiantly need to spend in pump/FRS/injectors, etc