480cc injectors on ca18det

[50-50]

Ok here's the deal. I got these injectors from a dsm head not sure what year, but I automatically assumed they where low impedence but on checking they measure 13.7-13.8 ohms. From the stamp on the side (inp 480) it seems that they are 480cc nippondenso injectors possibly from a S15. This is my first experience with a ca18det so I want to make it as potent and reliable as possible. In order to use these injectors I would have to eliminate the resistor pack. Does anyone have any experience running high impedence injectors on the ca18det, stock chipped ecu. I expect to generate about 240hp not whp for the daily drive. Any input would be greatly appreciated.

I have considered the following basic theory:

1. High impedence, side feed = higher heat dissipated, therfore to keep cooler better inside fuel rail.

2. Low impedence, top feed = lower heat dissipated, most of the heat dissipated in resistor pack.

3. High impedence, top feed = ???


Modified by 50-50 at 6:31 PM 2/12/2007

[Logan76]

Blue tops are 450cc's out of a DSM. atleast the DSM injectors I have are 450's and blue tops.

[50-50]

Blue tops are 450cc's out of a DSM. atleast the DSM injectors I have are 450's and blue tops.

are they stamped the same, i.e. (inp 480) or is the stamp on the 450s different.

[Logan76]

Let me go look, nope, they say on the side like -008 or something and bp450 on the other side which tells me they are 450's, I just assumed since you got them from a DSM guy they may be 450s and he lied to you.

[50-50]

Sorry no, I didnt buy them from someone, I pulled them off a head from a blown dsm motor, from what year car I'm not sure. I'm assuming the previous owner upgraded to these injectors. In my searches the closest match I can come up with is s15 480cc injectors. I would like to use them if possible with the stock ecu minus the resistor pack. Since I expect them to dissipate more heat in the confined ca18det im area, I'm going to try to remain around 70% duty cycle. Just curious if anyone has done this with good results. i.e. Stock chipped ecu, bigger high imp injectors, minus resistor pack.

[r34 gtr]

i know people on here are running them, they just havnt chimed in. you should be fine i think, but dont quote me on that.

[50-50]

thanks, i appreciate the input. Guess I'll be heading to the dyno. I'll post numbers and bin when completed.

[r34 gtr]

gangsta.

[50-50]

Well bad news for me. Just confirmed that these are not s15 injectors. They are mitsubushi injectors but are rated at 220cc, part number INP-480.
Modified by 50-50 at 7:56 PM 2/12/2007