Fuel injectors

[DrownInMilo]

Hey guys, got a vr 5l with suspect at least one bad injector. Will I be able to get away with putting 650cc Injectors in as long as I don’t upgrade the fuel rail or pump? When I bought the “new” motor for it it came with a race works rail and bigger injectors i was told 650s that I have laying around as I put my standard fuel setup on

 

[NORTI]

Feels like every time I see a post about changing injectors on the 5L it’s followed by changing back after issues.

 

[someguy360]

No, the injector flow rates, opening times etc all need to be changed in the tune. The ECU determines the calibration for the injectors, not the fuel pump/regulator.

You'll likely find it won't start at all as it will just flood the engine if they are too big, if it does run it will foul the plugs pretty much immediately.

I went from standard injectors to bluetops which are only 24lb over the standard 19 or so and I needed to do a fair bit of tuning to get it all happy.

650cc is 60lb, which is a big jump from the factory 19lb the standard injectors run, I'd be reasonably confident the engine wouldn't even start.

 

[BlackVXGTS]

This is a list of Holden injectors that I came across some time ago FYI:

 

[Lacksballs]

O/e spec injectors are required for an O/e engines ecu to operate correctly (unless you have the ability to get in and tune for larger injectors). Replace all injectors at the same time, buy a repeatable brand & from a known reseller.

 

[keith reed]

I've got blue tops in my vh but it has quite a bit more power than standard.

 

[someguy360]

I've got blue tops in my vh but it has quite a bit more power than standard.

Yeah, I only went up to bluetops on my 304 because I was hitting the dangerous limits of duty cycle at WOT on the standard ones.

But now I'm building a high comp big cam 355 which will likely max out the blue tops, and the cycle restarts.