What size injectors???

[SkylineLvr]

I plan on getting my injectors cleaned out and flow tested before getting my map done. I was curious as to what size I may have, so I removed one to see what the part number was. I originally planned on just removing the plug and trying to read them, but they were so dirty, I had to remove one.

The only numbers that were listed were A46-Z00 and 0124X07. Doing a google search, the 0124X07 didn't bring up anything, but the A46-Z00 brought up posts about NISMO 740s or 550s. I posted a pic below, but it's not of the best angle.



Anyone have any idea what they could be?

 

[Joeh]

They look like Nismo 740cc's to me.
I have a set and I remember them being A46-Z00

 

[Joeh]

Are they like this

http://imageshack.us/f/560/clipboard1ip.jpg/

Yours have a yellow clip at the bottom or are they just really old?

 

[Joeh]

This is the part number mine were boxed in

16600-RR544

 

[SkylineLvr]

Besides the yellow clip, they look identical to the 740s. If I get the time tomorrow, I'll take them out and try to get some better pics.

 

[Joeh]

I'd say rather than waste time taking them out again to take a photo of, send them to be flow tested and cleaned because they are looking like they've seen better days, make sure the place has the ability to flow test side-flow injectors

They should then give you a printout of the flow rate in cc

Joeh

 

[Joeh]

Should cost £15 /injector and could save your engine

 

[Auss15]

They are Nismo 740's, maybe even Tomei's. They need a clean as they have been in for a while. That plastic cover around the pintal has changed colour as it normally is a light grey. Id have them clean and flow tested.

 

[SkylineLvr]

I definitely will get them flow tested. I was originally going to wait until I was able to afford getting my map done, but I may try and get them done sooner. I'm now very interested in seeing if they truly are 740s. Thanks guys.

 

[Joeh]

You'd need to do them before your map because they look like they are not in a good state, if you do it after you could run lean if one of the injectors were leaky, also run rich if they were partially blocked

 

[SkylineLvr]

Yep, that's what I said in my first post.

So I know not to mess with the settings on my Power FC since I'm not a tuner, but I stumbled across this site: http://www.240sxmotoring.com/powerfctechfaq.html. Now, assuming that I do have 740cc injectors, I adjusted my injector correction settings from 41.7% and +0.20 to 50% and -0.04. This appears to have stopped my idle issues. Previously I would go into the ing/inj settings and adjust in there to stop the idle issue. But that was a temp fix because it would reset after the car powered off. Adjusting the injector correction settings from the website is permanent, but I can always change it back.

Since my car is sitting in the garage and won't be driven too much, I figure I won't do too much damage just messing around a little. Besides, I can always adjust back down. I can't wait to actually get my map and tune done so I can see what my car truly has in her.

 

[Joeh]

The injector latency is different between one injector and another even of the manufacturer gives a specification, this has to be configured properly using a wideband during mapping idle, I wouldn't recommend driving under any boost at all but yes that's the right way to adjust the injector correction based on stock injectors