Hiflow injectors

[PHaT MR30]

Have many ppl done this to their RB25DET injectors?

Would you recommend this?

[Steve]

No I wouldnt recommend this. Sometimes people get good results, sometimes not.

If you dont mind gambling, and you feel lucky go for it.

If you dont mind spending a little more (and tey arent that expensive at the moment, even new) and want the peace of mind knowing that you have a reliable know good product - with better resale value, buy proper aftermarket injectors.

my 0.02

[PHaT MR30]

and what is the limitations of the stock ones (ie BHP?

[Steve]

around 400bhp with upgraded fuel pump and fuel pressure reg.

[PHaT MR30]

oh well thats fine, cos i have all of the above mentioned and i don't want any more than 400hp.

plus got a few tricks up my sleeve, which can possibly lower the duty on the injectors

[the phantom]

How are standard injectors Hiflowed?

[SLY33]

what tricks do you have up your sleeve to lower the duty cycle? My injectors hit 97.7% duty cycle the other night Its going in for more fuel pressure and a tidy-up tune tomorrow..

even with duty cycle so high, the AFRs are fine and theres no knocking. Why do people say dont go over 80% duty cycle? (it only seems to go into the 90's on cold nights)

[Sydneykid]

Hi Sly33, all engines need a richer mixture to accelerate, so if you are driving along at 97% and put your foot down there is no capacity left in the injector to add fuel, so the engine will either bog or only accelerate slowly. That's the bad news. The good news is the 97% injector duty you see probably happens as you are accelerating and using that extra fuel. You have to check injector duty at constant throttle (not accelerating or decelerating) to abide by the 80% rule.

Also when an engine is cold it needs a lot richer mixture, if the injectors have no cpacity for this richness it will run bad when cold. Same when you have the air con on, turning the power steering, hi beam or running that mega stereo.

Hope that helps

[knore]

Dont Sard make a direct replacement for the RB25 standard injectors?

If i recall they come in 550cc and 800cc??

no fuel rail, just put em straight in