VIC: Trustworthy Mechanics

[DraftySquash]

Hi everyone,

I want to get my injectors looked at or possibly have them replaced. 
My car is a 2000 R34 GTT and I want to replace most parts since I got it imported for peace of mind. 
 

Are there any mechanics that you use who are trustworthy with a Skyline. I’m in the Western suburbs but I don’t want to go to some random mechanic who might just ruin the car. So looking for any recommendations. 
 

Apologies if this has been covered. I looked at threads with VIC topic but didn’t find anything. 

[GTSBoy]

You should Nistune the ECU, so you have freedom to use modern injectors instead of replacing with the same old shit. This is also required if you want to boost it up above ~200rwkW, where the stock injectors will be running out of capacity.

Having said that, it is unlikely that the injectors need replacing just 'coz. If you imported it from Japan, the fuel should have been pretty good quality for the whole life of the car.

[DraftySquash]

On 5/7/2024 at 11:53 AM, GTSBoy said:

You should Nistune the ECU, so you have freedom to use modern injectors instead of replacing with the same old shit. This is also required if you want to boost it up above ~200rwkW, where the stock injectors will be running out of capacity.

Having said that, it is unlikely that the injectors need replacing just 'coz. If you imported it from Japan, the fuel should have been pretty good quality for the whole life of the car.

@GTSBoythanks for the feedback. I was only worried about the injectors because when I changed the fuel filter, the colour from the fuel from it was pretty dark. Looked nasty to me 😂

Random question, if you get higher CC injectors before a Nistune, would the car run horrible? 

[Kinkstaah]

You really can't adjust anything fuel or air related without the ECU being told about the additional air or fuel.

You _can_ do a few things for efficiency, or cooling, which have knock on effects for power. I.e exhaust, intercooler, intake, but that's about it. Anything else needs an ECU for the engine to actually *know* about the changes that have been made to... uh, the engine.

[DraftySquash]

That makes sense @Kinkstaah

Would that mean the car would run as it always has until I get the tune? I’m just asking because I’m trying to understand whether I should try and get injectors and tube done at the same time. (I’d still need to drive from one place to another)

 

But I don’t want the car to run rich or crap itself while it’s got higher capacity injectors without a tune. Hope that makes sense? 

[Kinkstaah]

Injectors are told by the ECU to open for certain amounts of time.

If the injector flows more fuel, but the ECU doesn't know this, and is told to open for the same amount of time as the stock, smaller injector, then the larger injector will flow too much fuel/more fuel than the engine/ecu is expecting.

You absolutely need an ECU to control injectors.

You don't need a tune for a fuel pump (because your fuel pressure should remain the same assuming the regulator works).
You don't need a tune for an exhaust (the parameters for fuel and air going into the motor have not changed much)
You don't need a tune for an Intercooler (the parameters for fuel and air going into the motor have not changed much, it's just the air is cooler)

Yes, forum regulars, I know that you really should get a tune for an Exhaust, and Intercooler. These *will* affect the tune, but the stock tune does have some leniency to it with stock AFM and Injectors. Intercooler and Exhaust will fit within this wiggle room. So will running a boost tee to about 10psi, which is a very old way of increasing boost which is not worth doing in 2024.

The ECU is vital. It runs the whole show.

Most people change injectors and ECU at the same time for this reason. Some people load base maps on some ECU's that have ballpark figures for injector sizing. Sometimes injector manufacturers are really great and tell you what parameters to input into your ECU, which is something you can do with your new shiny ECU.

For a beginner, this may enable you to drive to the tuner to have an expert do the rest. Otherwise, you're installing injectors and ECU at home, and paying for a tow to a dyno. Or, you take the car to a workshop (be happy to travel across Melb for the right shop) and someone who knows RB will be able to source/provide/install injectors and tune the car at the same time if they have a dyno or access to a dyno.

The reason so many people DIY things here is because finding said workshop is hard, expensive, potentially getting things wrong with miscommunication/other.