SR20DET 370CC injectors installed

douglas vincent · Post by **douglas vincent** » Tue Dec 21, 2004 1:44 am

I purchased a set off of ebay for about $56. I got them in the mail today and and started to install them by pulling the injectors out of my car. Good thing I only pulled one to start with! Wrong rails!

So off to the junk yard, pulled a set of fuel rails ($3) and back to the shop. It took a little less than 4 hours of actual work to pull the rails, install the injectors and rails and drive back out of the shop.

First impressions is it DOES run rich at idle, and rich when just cruising along, more so at certain rpms. I am going for a longer drive tonight so the ecu might learn to compensate.

As for boost, the extra 100cc appears to fix the lack of fuel problem. I am now running the 6 psi in an NA block and ECU and not having problems.

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 1:48 am

You had to switch to 92-94 non-turbo rails, right?

The increase in flow is beyond the range of fuel trims, so it might learn to run a little better, but it will still run overly rich. Sounds like your car's about ready for an EJ22T ECU.

douglas vincent · Post by **douglas vincent** » Tue Dec 21, 2004 1:51 am

I would love to find one! Quck, someone drive their car into a tree! But only if you want to!

Yeah, I picked up the 92-94 rails for $3. I had to pay an extra $20 because I took the injectors but I get my money back when I return the injectors! Like someone is going to want bad injectors?!?!

douglas vincent · Post by **douglas vincent** » Tue Dec 21, 2004 1:51 am

these are the injectors

http://cgi.ebay.com/ebaymotors/ws/eBayI ... AMEWN%3AIT

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 1:54 am

Wow. You got a great deal on those injectors.

You might try PMing snowjob about an ECU:
http://bbs.legacycentral.org/viewtopic.php?t=19405

BAC5.2 · Post by **BAC5.2** » Tue Dec 21, 2004 4:18 am

Hmmm, so SR20DET injectors DO work for the 92-94 non-turbo rails....

Well then... I think I need to look into some 740cc injectors...

legacy92ej22t · Post by **legacy92ej22t** » Tue Dec 21, 2004 4:54 am

THAWA · Post by **THAWA** » Tue Dec 21, 2004 7:03 am

that's awesome, what cars used those injectors?

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 7:14 am

I think all SR20DET-equipped cars, like S14 Silvias, used them. US-market Infiniti Q45s also used them, I think.

THAWA · Post by **THAWA** » Tue Dec 21, 2004 7:45 am

hmm, what about VG30 engines? Those appear to be sidefeed on some models, but the nozzle is different, here's a pic of one: http://i1.ebayimg.com/03/i/03/13/03/84_1_b.JPG

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 7:57 am

Maybe. I don't know.

That injector kind of looks like the stock 90-91 non-turbo 4EAT injectors.

THAWA · Post by **THAWA** » Tue Dec 21, 2004 8:13 am

yeah that's what i was thinking.

THAWA · Post by **THAWA** » Tue Dec 21, 2004 8:29 am

oooo, while googling I found this: http://members.csinet.net/tisch/maxima/injectors.htm is that not pretty much the same as us?

-K- · Post by **-K-** » Tue Dec 21, 2004 12:19 pm

So they fit the rails, good start. I have a few contacts in the Nissan world, I'll try to find out what flow injectors come in what engines.
I hope there is a higher flow stock injector out there. If not I bet aftermarket ones are expensive enough that I would rather just build a rail for regular Bosch injectors.
Or try to mod some stock ones if they have caps.
Did you see if the SR20DET injectors had the caps that can be moded?

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 3:21 pm

Hardy - Yeah, it does look like the pre-92 Maxima injector might be the same shape as the pre-92 Legacy 4EAT non-turbo injector. And like the 92-on Maxima injector might be the same shape as the 92-on Legacy non-turbo injector.

-K- - It does look like the SR20DET injectors have the same cap that the 92-94 non-turbo Legacy injectors have. In fact, the construction seems to be very similar. They might even be the same injector aside from the color of the plastic and the holes in the cap.

There are multiple high-flow injector options for us. We just haven't figured out exactly what they are or done enough testing yet.

Post by **Legacy777** » Tue Dec 21, 2004 3:41 pm

THAWA wrote:hmm, what about VG30 engines? Those appear to be sidefeed on some models, but the nozzle is different, here's a pic of one: http://i1.ebayimg.com/03/i/03/13/03/84_1_b.JPG

Yeah these look damn close to being identical to the 90-91 AT injectors.

http://www.main.experiencetherave.com:8 ... P_2521.JPG
http://www.main.experiencetherave.com:8 ... P_2522.JPG

THAWA · Post by **THAWA** » Tue Dec 21, 2004 4:17 pm

oooo more googling

http://www.meggala.com/injectors.htm

It appears the VG30DETT uses the same injectors as the SR20DET and the RB25. So looks like we can start jackin z32 injectors aswell

Also looking at the bottom of the page reminded me of something. I was looking at the different Nissan MAFS and found that most of them are JECS units. However I did see that the Second set of chars "A36-000 XXX" Were different between all of them. I was just thiking that since someone said our stock mafs can only flow so much that maybe a Nissan maf would do the trick. But of course the ones I've seen that have been on turbo engines or whatever have all be JECS and our turbos use Hitachi so this may be all in vain.

vrg3 · Post by **vrg3** » Tue Dec 21, 2004 4:48 pm

In principle you should be able to make a Hitachi ECU understand a JECS MAF sensor. It doesn't matter who made the sensor; they're still similar in function.

I was thinking of making the stock turbo ECU work with a stock JECS non-turbo Legacy MAF sensor, since that would give the sensor about as much range as the injectors and the sensor is cheap and easy to find.

One day...

The Z32 MAF is supposedly a nice high-range sensor. Supposedly MAF sensors are kind of sensitive to the flow patterns through them, though. I wonder if the Nissan airbox is similar enough to the Subaru airbox.

That's interesting that you mention the part numbers... have you also noticed that the Nissan JECS sensors all have part numbers that start with 22680, just like Subaru MAF sensors?

douglas vincent · Post by **douglas vincent** » Tue Dec 21, 2004 5:55 pm

The injectors DO NOT fit our caps.

The injectors came with caps but no metal inserts.

I could have gotten the metal insert parts for the caps I am sure, but then I would have had to cut and crimp all the wiring. Didnt want to do that.

But the injectors ARE VERY CLOSE to fitting our caps. So I cut cround off two plastic tabs on the injectors, and the clip cap on the cap, and they slip perfectly on, but they are pressed on and could concievable come off, so I will have to keep an eye on them.

sammydafish · Post by **sammydafish** » Tue Dec 21, 2004 6:53 pm

THAWA wrote:Also looking at the bottom of the page reminded me of something. I was looking at the different Nissan MAFS and found that most of them are JECS units. However I did see that the Second set of chars "A36-000 XXX" Were different between all of them. I was just thiking that since someone said our stock mafs can only flow so much that maybe a Nissan maf would do the trick. But of course the ones I've seen that have been on turbo engines or whatever have all be JECS and our turbos use Hitachi so this may be all in vain.

FYI, on my old VG30 Maxima (1986) I used the MAF off and old Subaru 1.8 T GL-10 to build a CAI with. Worked great, just hte last few digits were different on the electronics and the only physical difference was the clip faced the other direction.

Brat4by4 · Post by **Brat4by4** » Tue Dec 21, 2004 7:10 pm

When you look up the air filter number for K&N's, I'm pretty sure it shares the same one with a lot of Infinity's. So the incoming flow should be about the same volume...

THAWA · Post by **THAWA** » Tue Dec 21, 2004 11:39 pm

The majority of subaru's, nissan's and infiniti's use the same air filter. Or dimensionally the same anyway.

What would have to be done to make a hitachi ecu understand a JECS maf? I was totally thinking about the z32 maf. I mean if it can handle a 300 hp turbo engine, it should be able to handle a turbo engine thats up to 300 hp. Course I'm sure there would be differences what with it being for a 6 cyl and completely different turbo, but you get the jist of where I was going with it.

Yes I did notice that on the MAFS's, I just assumed the reason the last 5 of the PN was different was because of the application it was used in. I think I saw one that had 6 wires, or something, and I've seen a couple 3 wire's. Also I saw that Q45's have a 90mm MAFS. I dunno how much or even if our engines are choking, but it could be intersting if someone you adapt that maf, and a 90mm tb and see if it made a difference.

What do you mean they dont fit our caps? You mean the plastice piece with the two prongs that you push onto the injector?

Man I love google: http://www.highlandsun.com/hyc/fuelrail/ Apparently the SR20DE injectors come in at least 3 flavors, Black top - 285CC Pink top - 325CC and Red top - 375CC.

hmm, makes me gitty jus thinking about what else could fit.

vrg3 · Post by **vrg3** » Wed Dec 22, 2004 12:26 am

THAWA wrote:What would have to be done to make a hitachi ecu understand a JECS maf?

At the very least, you'd need to rewrite the ECU's MAF sensor transfer function lookup table. You'd probably also want to find the code that triggers the "wrong MAF sensor" trouble code and disable or modify that.

I was totally thinking about the z32 maf. I mean if it can handle a 300 hp turbo engine, it should be able to handle a turbo engine thats up to 300 hp. Course I'm sure there would be differences what with it being for a 6 cyl and completely different turbo, but you get the jist of where I was going with it.

Well, 300 horsepower's worth of air is 300 horsepower's worth of air, no matter what kind of engine it's going into. The concern I'd have is whether the Nissan airbox is shaped similarly enough to the Subaru one. Also, I don't know where we'd find the Nissan MAF transfer functions. I have the Subaru ones because I ripped them out of Subaru ECUs.

Yes I did notice that on the MAFS's, I just assumed the reason the last 5 of the PN was different was because of the application it was used in.

Well, they're just different MAF sensors, with different transfer functions and such. Like the Hitachi EJ22T MAF sensor is 22680AA170. And the JECS Z32 sensor is 2268030P00. And the Q45 one is 2268061U00.

I think I saw one that had 6 wires, or something, and I've seen a couple 3 wire's.

I'm pretty sure all the JECS MAF sensors only actually use three wires. Ground, +12v, and the signal output.

Also I saw that Q45's have a 90mm MAFS. I dunno how much or even if our engines are choking, but it could be intersting if someone you adapt that maf, and a 90mm tb and see if it made a difference.

Yeah, it would potentially free up some airflow. I think part of the reason JECS made the sensor bore larger is just to increase the range of the sensor though. The hot-wire element samples a small portion of the airflow; the wider the sensor housing is, the smaller that portion is relative to the rest of the airflow.

THAWA · Post by **THAWA** » Wed Dec 22, 2004 2:19 am

The Z32 airbox isn't like much else out there. It's basically two airboxes joined in the middle to where the MAFS attaches.

douglas vincent · Post by **douglas vincent** » Wed Dec 22, 2004 2:28 am

Yes the plastic piece with the two prongs. wrong spots and upside down. Thats why you have to grind off one tab, and the "clicker" thing.

And my injectors are blue.

legacycentral bbs

A forum for 89-94 BC-BF(BJ) Legacy Owners and Fans

SR20DET 370CC injectors installed

SR20DET 370CC injectors installed