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5.5 Gen injectors in 4th gen with 00VI

Old 08-08-2015, 11:25 PM
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5.5 Gen injectors in 4th gen with 00VI

Hi all,
I was looking at a thread in the all motor section about injector flow rates and other various stats. See below:

https://maxima.org/forums/all-motor/...omparison.html

I noticed the 5th gen injectors are 4 hole, and the 5.5 gen are 18 hole. The flow rates are slightly different 306cm/min - 5th gen 294cm/min - 5.5 gen. Besides that, they looked identical.

The article talks about how more holes help atomization. So my thought was, why not try some 18 hole injectors in my 5th gen LIM and see if it helps.

Here is a pic of the 5.5 gen injectors (missing the pintle cap. Many of the caps were stuck in the LIM. I had to pry them out and pop them back on.




First a little back story on my 00VI swap:
August of last year I completed the 00VI swap with the 4th gen LIM and IACV. 5th gen TB, UIM (obviously), and EGR delete.

June of this year I swapped the the 4th gen LIM with the 5th gen LIM. (I had no way to tune at the time of my initial 00VI. I added a Emanage Blue in the spring) I felt a little bit of improvement over the 4th gen LIM. Not a big boost, but every little bit helps. Tuning is not my strong spot, so I'm running on a basic street tune. I'll work on getting the map fine tuned when I get around to it. WOT runs 10-12 AFR.

I took a quick trip to the junkyard and picked up 6 5.5 gen injectors. They fit right in, no issues at all with the install, even the plugs are the same. It was more of a pain to take the UIM off for the third time in a year. I cleaned them first, just as I did with the 5th gen 4 hole injectors.
I didn't touch the tune, I figured the difference was small enough I could take on the task of tuning later.

My first impression is WOW. These new injectors are great!!!
I can't believe I haven't heard about this on the .org

Mid throttle low RPM made the most improvement. Not a lot of gain at high RPM, but no losses. The best gains are below 3500 rpm at mid throttle. Idle seems a little smoother to boot. This is a great mod, especially if you are doing an 00VI with the 5th gen LIM. I can't get over how much more power I have below 3000rpms. Without touching the tune from the 5th gen injectors, I'm running 12-12.7 at WOT. SO that problem seemed to take care of itself.

It's too early to tell, but I'm hoping my gas mileage might go up slightly also. You know the spot your used to resting your foot to keep a certain speed (25mph, 55mph, etc.) I had to re-learn my position, I found myself slowly accelerating with my current foot position.

Has anyone else done this? If so, what were the results?
I spent hours looking online looking for someone who was done this, but to no avail.
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Old 08-09-2015, 12:07 AM
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Glad to see my test results being put to good use.

Would love to see how your average MPG is affected.
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Old 08-09-2015, 03:00 AM
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This is great stuff indeed
It would be nice to see the numbers on a dyno.
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Old 08-19-2015, 05:10 PM
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Well,
I have some mileage reults to post up.
I've gone through two tanks with the new injectors.
Sorry to say I don't have good numbers from before the injector swap. I have a rough guess, but nothing concrete.
My average fuel economy which is 70/30 city/highway (75mph) comes out to 26mpg.
Keep in mind, I am beating on my car during those two tankfulls, I just got a new mod working, what else am I supossed to do with it?
I am also running a little rich during heavy throttle. Once the ECU changed the fuel curves, my WOT runs dropped to around 10 afr. I've been working to pull them up to 13ish. (Don't have the money for a pro tune, so I'm street tuning it as I go)

Everything considered, I think 26mpg isn't bad at all. I will try a tank of average driving and see if I can get the number above 30.
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Old 08-20-2015, 03:26 AM
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Originally Posted by Finkle View Post
....Everything considered, I think 26mpg isn't bad at all. I will try a tank of average driving and see if I can get the number above 30.
When I bought my car and drove it cross country, about 5K miles, my average for the entire trip was 26 mpg.

Your car has bigger rims, so it should be worse than mine with the OEM size 16s. Plus with perhaps your non-fuel-economy driving, your 26 mpg is already better than mine.
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Old 08-20-2015, 05:42 AM
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lol this is kind of known information. +5th gen injector plugs are used on EVERY modern nissan period. So you can take GTR injectors and drop them in without any modification. Im running the green denso on an 00VI, hopefully the atomization of these injectors adds a little bit more fuel efficiency, but we are talking about an added .2mpg, not something to jump up and down over but i have run the VQ35 injectors on a VQ30 and they did fine, i didn't notice anything over the stock 4th gen injectors.

IF you really wanna improve mpg, take it to a dyno and have a tuner lean out the mixture. If you dont intend on taking long highway trips this will help raise your mpgs. But leaning out the generally is known to increase cylinder temps so an EGT might be needed to keep you safe. Most tuners will cost you around $200 for just a simple injector adjustment its not really a heavy tune.
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Old 08-27-2015, 05:19 PM
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I found an interesting article:
Cleaning the nozzles on the Nissan Cefiro or its translation by Google.
Many photos.
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Old 08-28-2015, 09:13 AM
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Originally Posted by minus View Post
I found an interesting article:
Cleaning the nozzles on the Nissan Cefiro or its translation by Google.
Many photos.
What's weird is that his injectors looked fine. No broken or brittle pintle caps. All o-rings in place. The screens were a little dirty Something tells me he could have have dropped some TCW3 in his tank and it would have brought his injectors back to life. No need to take apart the manifold or nothing.
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Old 08-28-2015, 12:41 PM
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Originally Posted by Crusher103 View Post
lol this is kind of known information.
It wasn't known to me. lol. I did hours of looking online to see if this was possible before grabbing injectors and giving it a try. I couldn't find anything online, so I was excited to share my success on the .org.

I think the option of using newer injectors in an 00VI swap might make a difference if people use the 5th or 4th gen lower.
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Old 09-27-2015, 01:42 AM
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Hello,

I am on the fence for buying a 00vi kit from another Org member and his comes with 350z Injectors. I don't know how many holes are in the 350z injectors, but which injectors have better atomization? 350z or 5.5 gen injectors.

I know these are the flow rate differences, but does anyone know differences in atmization?

VQ30DE-K injectors 290cc @ 3.0 BAR (FBJC100)
VQ35DE (Maxima) injectors 290cc (315cc @ 3.5 BAR) (FBJC101)
VQ35DE (350Z) injectors 310cc (335cc @ 3.5 BAR) (FBJC100)

Thanks!
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Old 09-27-2015, 09:09 AM
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Originally Posted by lrb6805 View Post
Hello,

I am on the fence for buying a 00vi kit from another Org member and his comes with 350z Injectors. I don't know how many holes are in the 350z injectors, but which injectors have better atomization? 350z or 5.5 gen injectors.

I know these are the flow rate differences, but does anyone know differences in atmization?

VQ30DE-K injectors 290cc @ 3.0 BAR (FBJC100)
VQ35DE (Maxima) injectors 290cc (315cc @ 3.5 BAR) (FBJC101)
VQ35DE (350Z) injectors 310cc (335cc @ 3.5 BAR) (FBJC100)

Thanks!
https://maxima.org/forums/all-motor/...omparison.html
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Old 09-27-2015, 04:56 PM
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Wanted to toss one more fuel economy update out there:

I tried to baby it as best I could (below 4k RPM). Same 70/30 city/highway driving. Averaged out to 29mpg this time.
I know my opinion is slanted, but I don't think I've ever hit 29mpg before, even with all highway driving.

I'm not sure in degrees how much timing its pulling, but at WOT, the emanage is pulling 23% fuel to keep it around 12.8
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Old 09-27-2015, 07:42 PM
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Originally Posted by schmellyfart View Post
Yeah I had read throguh it, but I had totally missed that the Green Denso were the 350z injectors.... oops. Thanks though
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Old 09-27-2015, 09:53 PM
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Originally Posted by lrb6805 View Post
Yeah I had read throguh it, but I had totally missed that the Green Denso were the 350z injectors.... oops. Thanks though
Not quite. FBJC100 (DEK) injectors are the same as the DE 350z. Green densos are HR 350z and 7th gen Maxima.
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Old 06-12-2019, 08:09 AM
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Wrong post.

Some how I put this in the wrong place.

Last edited by tch3rd; 06-12-2019 at 08:11 AM. Reason: Wrong post
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