Modified Standard injectors vs 'Proper' injectors

[Shearer]

Are standard injectors modified to flow more fuel as good as the 'proper' equivalent injectors?

I have a set of standard-looking (ei: modified) 440cc injectors on my Vn S/C V6. However I was told the flow rate can be questionable as compared to 'proper' injectors.

Does anyone know if this is true?

[Darren_L]

often they just redrill the pintle hole on modified standard injectors to theoretically achieve the higher flow figure - which is where they differ from a injector built to flow that figure.
Usually they don't upgrade the internal coil to cope with the increased flow. As a general rule, injectors should be run at a maximum of 80% of their duty cycle afterwhich the spray pattern tends to degrade due to the internal coil overheating.
eg 19lb injector at 100% duty cycle is good for approx 29hp. However at 80% duty cycle = 23hp.

now if 19lb injector is upgraded to a 40lb injector, without upgrading the internal coil, then it's still going to start breaking down beyond 23hp. It may have the potential to flow 40lb, but it's not likely to be reliable or maintain a uniform spray pattern.

I personally wouldn't recommend them

[delcowizzid]

just buy new the size you want .then end of an injector is cut by a laser to withen 0.1micron accuracy or something silly its the most precise componant on a car so peaople do just drill them out

[Shearer]

I forgot I starting this thread....

After reading a these comments, I'll be giving 'modified' injectors the boot; the car seems to display some of the symptoms described above.

Time to look for some decent injectors

[Pub247]

My mate has drilled out injector in hix ed turbo major problem is tuning with them as stated flow rate are all over the shop