Has this been done at all or are ya just comparing them??

sentratron007 wrote:

i have ser injectors on my ride .

How much of a size difference are the 2.5 injectors???

cute02spec wrote:

SE-Rs (B15s) have 310s for injectors.

And the qg injectors are something like 190cc. 


I have the wrx injectors installed in my spare qg fuel rail and intake manifold right now.  They fit fine with those blue o-rings (in the picture) on the top and bottom.  I dont remember where the o-rings came from, but they should be available at any parts store.  Just buy an assortment and experiment.

to see if i could get a better tune with ser injectors. i have heard of ser injectors on other 1.8l sentras before and a friend of mine who works at nissan as a mec told me this would work.

for more fuel i added a ser maf sensor and to tune im still looking for the best option for a piggyback.

not really i did it for a better spray of fuel. the stock injectors are good but very small.

sentratron007 wrote:

not really i did it for a better spray of fuel. the stock injectors are good but very small.

a better spray of fuel?  please tell me how a injector that only flows more cc's is going to give a better spray of fuel?

gurov wrote:

i suppose if you get bigger injectors and use safc to take out fuel, you'd be bumping the timing up slightly. this is the unfortunate side-effect of massive injectors, with my 660's the car knocks all over the place, taking out like -25% fuel

Im still a little confused about how that works.  Ive read that pulling airflow out in effect retards the fuel map, which has the same result as advancing the timing map.  But is it in the way the safc pulls airflow or is it in the actual lowered amount of airflow sensed?  Say if I used a larger maf housing (vq30/ sr20) on my qg, it would lower the airflow signal to the ecu, but would it also advance the timing?  Im thinking it wouldn't, but I dont really understand this yet.