just fitted some 740cc injectors to my 93/94 plate impreza,it now will not idle and runs rough under light throttle,revs up fine,i am guessing that i need to have my power fc adjusted as i had 440cc fitted before,i am booking jolly green monster to come and map it but didnt want to get him all the way to my place to find that i have a knackered set of injectors,guessing its running rough due to excess fuel being dumped into the cylinders due to them being alot bigger,car ran fine before even tho i have not had the power fc mapped to my car since i brought it,just been trying to get all the mods done before i had it mapped

 

yeah it will def need mapping to run ok, y have you gone for huge injectors that size?

 

will be getting a 20g turbo as my last mod,and they were cheap,

 

ahh righto, might have been better with 550's cos the 740's are gonna be way way to big and might suffer from slower responce times.

but none the less should think untill its mapped will be all over the place as far as fueling goes

 

yer but at £100 i couldnt say no,lol,and so i have been told i wont need to run them anywhere near there max cycle,also they are surposed to go well with 20g fitments,have got jolly green monster coming to map it

 

Using the commander go to the injector scale setting and turn them down from 100% to around 65% , this will get you in the ball park for a minute..
Then stick to the speed limit till it's mapped and you will be fine...

 

tried that,100% down to 75% but it made it worse,guessing its the map that needs adjusting

 

If there Venom 740cc injectors Simon aka Jolly will probably tell you to change them

 

Either fit your old injectors back until it gets mapped, or get the mapped tweaked by some one who knows what they are doing.

 

Ive got 740's with my 20g, but I think they are nismos. No problems with idle

 

no they are nismos/apexi ones i think,think its just down to the set up/map of them on the power fc,have got simon coming to map it soon so that should clear it up,,