Injectors

[tarmac_R32]

just a quick one, at what boost level would you upgarde the injectors? and at what point will they offer more power?

[MrStabby]

just a quick one, at what boost level would you upgarde the injectors? and at what point will they offer more power?

Using a power figure makes more sense than boost level, because different turbos flow different amounts of air at the same boost level. For GTR i believe its generally around the 280kw mark, assuming standard fuel rail pressure. Rough guideline only, YMMV.

[craig132]

just a quick one, at what boost level would you upgarde the injectors? and at what point will they offer more power?

what engine is the injectors off?

[R31Nismoid]

GTR - 280rwkw give/take... every set is different after 20 years

[Parag0n]

The standard injectors would remain linear to around 84% duty cycle after that they go static meaning they're constantly open, this is what leads to detonation and blown engines.

If you have a PFC Handset or another aftermarket dash monitor your duty cycle, I ended up changing my injectors on my GT-R when I was above 250rwkw just to be safe with an in-tank fuel pump.

Edited October 3, 2009 by Parag0n

[bloodsword27]

rb25det ones didnt like 250kw

[tarmac_R32]

thanks guys, this helps alot.

im looking for around the 300rwkw mark on my RB26 so will now be looking for some injectors, any ideas on which ones?

[boostn0199]

nismo 555 wil do the job or 740 if you want to have some room for more power

[MrStabby]

I bought seimens 550s from the states on ebay for around $500 dollars, otherwise sards from japan (nengun/greenline etc) will be more like $750.

On the seimens i replaced the top seal with o rings from the standard injectors, as the supplied seals fell apart (too large and we crushed AFAICT)

If you're doing it yourself check my DIY HERE