Can I Upgrade Injectors Without Retune

[itbmils]

Guys

this is probably a SQ but I have just got hold of a set of new 550cc injectors and some splitfire coil packs for my R32 GTR

My questions is can I fit these without needing to retune my PFC

I assume the coils will be a safe swap - but what about the injectors ?

If it does require a retune - should it require a FULL retune ($700 on the dyno) or can my current tune be tweaked ?

[R31Nismoid]

you cant swap without retune.

i wouldnt be too much or alteration. certainly not a full tune price

[JCMarshall_Law]

Different injectors will have different flow rates at the same duty cycles so - yes you will need a retune. Although you will not need to start from scratch so it should not be anything like the cost of a full initial tune.

Edited September 22, 2005 by JCMarshall_Law

[gtr fan]

I just had some 550cc's fitted by BEL Garage and Ben just adjusted the POWER FC to suit didn't take long at all, still runs perfect and gets 450-500km per tank.

[pnblight]

will need to be adjusted on the pfc and a/f checked but it would only be to check the calibration of the setting for the new injectors a few runs on the dyno should do it, no worries 1hour but no more than 1 1/2hours MAX(if it's tuned well now.

[Duncan]

you do need to retune it but you can drive it there if you like, 550 are only 12% more fuel than 440s.